mirror of
https://github.com/vim/vim.git
synced 2025-07-04 23:07:33 -04:00
Problem: A quick undo shows "1 seconds ago". (Tony Mechelynck) Solution: Add singular/plural message.
3599 lines
89 KiB
C
3599 lines
89 KiB
C
/* vi:set ts=8 sts=4 sw=4 noet:
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*
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* VIM - Vi IMproved by Bram Moolenaar
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*
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* Do ":help uganda" in Vim to read copying and usage conditions.
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* Do ":help credits" in Vim to see a list of people who contributed.
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* See README.txt for an overview of the Vim source code.
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*/
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/*
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* undo.c: multi level undo facility
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*
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* The saved lines are stored in a list of lists (one for each buffer):
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*
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* b_u_oldhead------------------------------------------------+
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* |
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* V
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* +--------------+ +--------------+ +--------------+
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* b_u_newhead--->| u_header | | u_header | | u_header |
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* | uh_next------>| uh_next------>| uh_next---->NULL
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* NULL<--------uh_prev |<---------uh_prev |<---------uh_prev |
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* | uh_entry | | uh_entry | | uh_entry |
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* +--------|-----+ +--------|-----+ +--------|-----+
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* | | |
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* V V V
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* +--------------+ +--------------+ +--------------+
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* | u_entry | | u_entry | | u_entry |
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* | ue_next | | ue_next | | ue_next |
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* +--------|-----+ +--------|-----+ +--------|-----+
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* | | |
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* V V V
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* +--------------+ NULL NULL
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* | u_entry |
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* | ue_next |
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* +--------|-----+
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* |
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* V
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* etc.
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*
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* Each u_entry list contains the information for one undo or redo.
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* curbuf->b_u_curhead points to the header of the last undo (the next redo),
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* or is NULL if nothing has been undone (end of the branch).
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*
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* For keeping alternate undo/redo branches the uh_alt field is used. Thus at
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* each point in the list a branch may appear for an alternate to redo. The
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* uh_seq field is numbered sequentially to be able to find a newer or older
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* branch.
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*
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* +---------------+ +---------------+
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* b_u_oldhead --->| u_header | | u_header |
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* | uh_alt_next ---->| uh_alt_next ----> NULL
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* NULL <----- uh_alt_prev |<------ uh_alt_prev |
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* | uh_prev | | uh_prev |
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* +-----|---------+ +-----|---------+
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* | |
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* V V
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* +---------------+ +---------------+
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* | u_header | | u_header |
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* | uh_alt_next | | uh_alt_next |
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* b_u_newhead --->| uh_alt_prev | | uh_alt_prev |
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* | uh_prev | | uh_prev |
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* +-----|---------+ +-----|---------+
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* | |
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* V V
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* NULL +---------------+ +---------------+
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* | u_header | | u_header |
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* | uh_alt_next ---->| uh_alt_next |
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* | uh_alt_prev |<------ uh_alt_prev |
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* | uh_prev | | uh_prev |
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* +-----|---------+ +-----|---------+
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* | |
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* etc. etc.
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*
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*
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* All data is allocated and will all be freed when the buffer is unloaded.
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*/
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/* Uncomment the next line for including the u_check() function. This warns
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* for errors in the debug information. */
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/* #define U_DEBUG 1 */
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#define UH_MAGIC 0x18dade /* value for uh_magic when in use */
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#define UE_MAGIC 0xabc123 /* value for ue_magic when in use */
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/* Size of buffer used for encryption. */
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#define CRYPT_BUF_SIZE 8192
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#include "vim.h"
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/* Structure passed around between functions.
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* Avoids passing cryptstate_T when encryption not available. */
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typedef struct {
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buf_T *bi_buf;
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FILE *bi_fp;
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#ifdef FEAT_CRYPT
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cryptstate_T *bi_state;
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char_u *bi_buffer; /* CRYPT_BUF_SIZE, NULL when not buffering */
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size_t bi_used; /* bytes written to/read from bi_buffer */
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size_t bi_avail; /* bytes available in bi_buffer */
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#endif
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} bufinfo_T;
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static long get_undolevel(void);
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static void u_unch_branch(u_header_T *uhp);
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static u_entry_T *u_get_headentry(void);
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static void u_getbot(void);
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static void u_doit(int count);
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static void u_undoredo(int undo);
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static void u_undo_end(int did_undo, int absolute);
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static void u_add_time(char_u *buf, size_t buflen, time_t tt);
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static void u_freeheader(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
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static void u_freebranch(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
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static void u_freeentries(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
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static void u_freeentry(u_entry_T *, long);
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#ifdef FEAT_PERSISTENT_UNDO
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static void corruption_error(char *mesg, char_u *file_name);
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static void u_free_uhp(u_header_T *uhp);
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static int undo_write(bufinfo_T *bi, char_u *ptr, size_t len);
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# ifdef FEAT_CRYPT
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static int undo_flush(bufinfo_T *bi);
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# endif
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static int fwrite_crypt(bufinfo_T *bi, char_u *ptr, size_t len);
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static int undo_write_bytes(bufinfo_T *bi, long_u nr, int len);
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static void put_header_ptr(bufinfo_T *bi, u_header_T *uhp);
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static int undo_read_4c(bufinfo_T *bi);
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static int undo_read_2c(bufinfo_T *bi);
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static int undo_read_byte(bufinfo_T *bi);
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static time_t undo_read_time(bufinfo_T *bi);
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static int undo_read(bufinfo_T *bi, char_u *buffer, size_t size);
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static char_u *read_string_decrypt(bufinfo_T *bi, int len);
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static int serialize_header(bufinfo_T *bi, char_u *hash);
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static int serialize_uhp(bufinfo_T *bi, u_header_T *uhp);
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static u_header_T *unserialize_uhp(bufinfo_T *bi, char_u *file_name);
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static int serialize_uep(bufinfo_T *bi, u_entry_T *uep);
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static u_entry_T *unserialize_uep(bufinfo_T *bi, int *error, char_u *file_name);
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static void serialize_pos(bufinfo_T *bi, pos_T pos);
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static void unserialize_pos(bufinfo_T *bi, pos_T *pos);
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static void serialize_visualinfo(bufinfo_T *bi, visualinfo_T *info);
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static void unserialize_visualinfo(bufinfo_T *bi, visualinfo_T *info);
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#endif
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#define U_ALLOC_LINE(size) lalloc((long_u)(size), FALSE)
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static char_u *u_save_line(linenr_T);
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/* used in undo_end() to report number of added and deleted lines */
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static long u_newcount, u_oldcount;
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/*
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* When 'u' flag included in 'cpoptions', we behave like vi. Need to remember
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* the action that "u" should do.
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*/
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static int undo_undoes = FALSE;
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static int lastmark = 0;
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#if defined(U_DEBUG) || defined(PROTO)
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/*
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* Check the undo structures for being valid. Print a warning when something
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* looks wrong.
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*/
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static int seen_b_u_curhead;
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static int seen_b_u_newhead;
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static int header_count;
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static void
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u_check_tree(u_header_T *uhp,
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u_header_T *exp_uh_next,
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u_header_T *exp_uh_alt_prev)
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{
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u_entry_T *uep;
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if (uhp == NULL)
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return;
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++header_count;
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if (uhp == curbuf->b_u_curhead && ++seen_b_u_curhead > 1)
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{
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EMSG("b_u_curhead found twice (looping?)");
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return;
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}
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if (uhp == curbuf->b_u_newhead && ++seen_b_u_newhead > 1)
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{
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EMSG("b_u_newhead found twice (looping?)");
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return;
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}
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if (uhp->uh_magic != UH_MAGIC)
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EMSG("uh_magic wrong (may be using freed memory)");
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else
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{
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/* Check pointers back are correct. */
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if (uhp->uh_next.ptr != exp_uh_next)
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{
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EMSG("uh_next wrong");
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smsg((char_u *)"expected: 0x%x, actual: 0x%x",
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exp_uh_next, uhp->uh_next.ptr);
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}
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if (uhp->uh_alt_prev.ptr != exp_uh_alt_prev)
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{
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EMSG("uh_alt_prev wrong");
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smsg((char_u *)"expected: 0x%x, actual: 0x%x",
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exp_uh_alt_prev, uhp->uh_alt_prev.ptr);
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}
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/* Check the undo tree at this header. */
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for (uep = uhp->uh_entry; uep != NULL; uep = uep->ue_next)
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{
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if (uep->ue_magic != UE_MAGIC)
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{
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EMSG("ue_magic wrong (may be using freed memory)");
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break;
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}
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}
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/* Check the next alt tree. */
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u_check_tree(uhp->uh_alt_next.ptr, uhp->uh_next.ptr, uhp);
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/* Check the next header in this branch. */
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u_check_tree(uhp->uh_prev.ptr, uhp, NULL);
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}
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}
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static void
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u_check(int newhead_may_be_NULL)
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{
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seen_b_u_newhead = 0;
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seen_b_u_curhead = 0;
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header_count = 0;
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u_check_tree(curbuf->b_u_oldhead, NULL, NULL);
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if (seen_b_u_newhead == 0 && curbuf->b_u_oldhead != NULL
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&& !(newhead_may_be_NULL && curbuf->b_u_newhead == NULL))
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EMSGN("b_u_newhead invalid: 0x%x", curbuf->b_u_newhead);
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if (curbuf->b_u_curhead != NULL && seen_b_u_curhead == 0)
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EMSGN("b_u_curhead invalid: 0x%x", curbuf->b_u_curhead);
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if (header_count != curbuf->b_u_numhead)
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{
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EMSG("b_u_numhead invalid");
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smsg((char_u *)"expected: %ld, actual: %ld",
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(long)header_count, (long)curbuf->b_u_numhead);
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}
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}
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#endif
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/*
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* Save the current line for both the "u" and "U" command.
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* Careful: may trigger autocommands that reload the buffer.
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* Returns OK or FAIL.
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*/
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int
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u_save_cursor(void)
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{
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return (u_save((linenr_T)(curwin->w_cursor.lnum - 1),
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(linenr_T)(curwin->w_cursor.lnum + 1)));
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}
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/*
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* Save the lines between "top" and "bot" for both the "u" and "U" command.
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* "top" may be 0 and bot may be curbuf->b_ml.ml_line_count + 1.
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* Careful: may trigger autocommands that reload the buffer.
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* Returns FAIL when lines could not be saved, OK otherwise.
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*/
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int
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u_save(linenr_T top, linenr_T bot)
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{
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if (undo_off)
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return OK;
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if (top >= bot || bot > curbuf->b_ml.ml_line_count + 1)
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return FAIL; // rely on caller to give an error message
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if (top + 2 == bot)
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u_saveline((linenr_T)(top + 1));
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return (u_savecommon(top, bot, (linenr_T)0, FALSE));
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}
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/*
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* Save the line "lnum" (used by ":s" and "~" command).
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* The line is replaced, so the new bottom line is lnum + 1.
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* Careful: may trigger autocommands that reload the buffer.
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* Returns FAIL when lines could not be saved, OK otherwise.
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*/
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int
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u_savesub(linenr_T lnum)
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{
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if (undo_off)
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return OK;
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return (u_savecommon(lnum - 1, lnum + 1, lnum + 1, FALSE));
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}
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/*
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* A new line is inserted before line "lnum" (used by :s command).
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* The line is inserted, so the new bottom line is lnum + 1.
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* Careful: may trigger autocommands that reload the buffer.
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* Returns FAIL when lines could not be saved, OK otherwise.
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*/
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int
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u_inssub(linenr_T lnum)
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{
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if (undo_off)
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return OK;
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return (u_savecommon(lnum - 1, lnum, lnum + 1, FALSE));
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}
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/*
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* Save the lines "lnum" - "lnum" + nlines (used by delete command).
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* The lines are deleted, so the new bottom line is lnum, unless the buffer
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* becomes empty.
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* Careful: may trigger autocommands that reload the buffer.
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* Returns FAIL when lines could not be saved, OK otherwise.
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*/
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int
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u_savedel(linenr_T lnum, long nlines)
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{
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if (undo_off)
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return OK;
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return (u_savecommon(lnum - 1, lnum + nlines,
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nlines == curbuf->b_ml.ml_line_count ? 2 : lnum, FALSE));
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}
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/*
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* Return TRUE when undo is allowed. Otherwise give an error message and
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* return FALSE.
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*/
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int
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undo_allowed(void)
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{
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/* Don't allow changes when 'modifiable' is off. */
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if (!curbuf->b_p_ma)
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{
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EMSG(_(e_modifiable));
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return FALSE;
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}
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#ifdef HAVE_SANDBOX
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/* In the sandbox it's not allowed to change the text. */
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if (sandbox != 0)
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{
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EMSG(_(e_sandbox));
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return FALSE;
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}
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#endif
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/* Don't allow changes in the buffer while editing the cmdline. The
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* caller of getcmdline() may get confused. */
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if (textlock != 0)
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{
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EMSG(_(e_secure));
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return FALSE;
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}
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return TRUE;
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}
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/*
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* Get the undolevle value for the current buffer.
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*/
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static long
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get_undolevel(void)
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{
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if (curbuf->b_p_ul == NO_LOCAL_UNDOLEVEL)
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return p_ul;
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return curbuf->b_p_ul;
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}
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/*
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* Common code for various ways to save text before a change.
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* "top" is the line above the first changed line.
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* "bot" is the line below the last changed line.
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* "newbot" is the new bottom line. Use zero when not known.
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* "reload" is TRUE when saving for a buffer reload.
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* Careful: may trigger autocommands that reload the buffer.
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* Returns FAIL when lines could not be saved, OK otherwise.
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*/
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int
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u_savecommon(
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linenr_T top,
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linenr_T bot,
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linenr_T newbot,
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int reload)
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{
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linenr_T lnum;
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long i;
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u_header_T *uhp;
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u_header_T *old_curhead;
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u_entry_T *uep;
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u_entry_T *prev_uep;
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long size;
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if (!reload)
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{
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/* When making changes is not allowed return FAIL. It's a crude way
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* to make all change commands fail. */
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if (!undo_allowed())
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return FAIL;
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#ifdef FEAT_NETBEANS_INTG
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/*
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* Netbeans defines areas that cannot be modified. Bail out here when
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* trying to change text in a guarded area.
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*/
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if (netbeans_active())
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{
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if (netbeans_is_guarded(top, bot))
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{
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EMSG(_(e_guarded));
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return FAIL;
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}
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if (curbuf->b_p_ro)
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{
|
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EMSG(_(e_nbreadonly));
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return FAIL;
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}
|
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}
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#endif
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#ifdef FEAT_TERMINAL
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/* A change in a terminal buffer removes the highlighting. */
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term_change_in_curbuf();
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#endif
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/*
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* Saving text for undo means we are going to make a change. Give a
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* warning for a read-only file before making the change, so that the
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* FileChangedRO event can replace the buffer with a read-write version
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* (e.g., obtained from a source control system).
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*/
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change_warning(0);
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if (bot > curbuf->b_ml.ml_line_count + 1)
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{
|
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/* This happens when the FileChangedRO autocommand changes the
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* file in a way it becomes shorter. */
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EMSG(_("E881: Line count changed unexpectedly"));
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return FAIL;
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}
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}
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#ifdef U_DEBUG
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u_check(FALSE);
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#endif
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size = bot - top - 1;
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/*
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* If curbuf->b_u_synced == TRUE make a new header.
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*/
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if (curbuf->b_u_synced)
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{
|
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#ifdef FEAT_JUMPLIST
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/* Need to create new entry in b_changelist. */
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curbuf->b_new_change = TRUE;
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#endif
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if (get_undolevel() >= 0)
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{
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/*
|
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* Make a new header entry. Do this first so that we don't mess
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* up the undo info when out of memory.
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*/
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uhp = (u_header_T *)U_ALLOC_LINE(sizeof(u_header_T));
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if (uhp == NULL)
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goto nomem;
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#ifdef U_DEBUG
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uhp->uh_magic = UH_MAGIC;
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#endif
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}
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else
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uhp = NULL;
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|
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/*
|
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* If we undid more than we redid, move the entry lists before and
|
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* including curbuf->b_u_curhead to an alternate branch.
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*/
|
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old_curhead = curbuf->b_u_curhead;
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if (old_curhead != NULL)
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{
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curbuf->b_u_newhead = old_curhead->uh_next.ptr;
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curbuf->b_u_curhead = NULL;
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}
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|
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/*
|
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* free headers to keep the size right
|
|
*/
|
|
while (curbuf->b_u_numhead > get_undolevel()
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&& curbuf->b_u_oldhead != NULL)
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{
|
|
u_header_T *uhfree = curbuf->b_u_oldhead;
|
|
|
|
if (uhfree == old_curhead)
|
|
/* Can't reconnect the branch, delete all of it. */
|
|
u_freebranch(curbuf, uhfree, &old_curhead);
|
|
else if (uhfree->uh_alt_next.ptr == NULL)
|
|
/* There is no branch, only free one header. */
|
|
u_freeheader(curbuf, uhfree, &old_curhead);
|
|
else
|
|
{
|
|
/* Free the oldest alternate branch as a whole. */
|
|
while (uhfree->uh_alt_next.ptr != NULL)
|
|
uhfree = uhfree->uh_alt_next.ptr;
|
|
u_freebranch(curbuf, uhfree, &old_curhead);
|
|
}
|
|
#ifdef U_DEBUG
|
|
u_check(TRUE);
|
|
#endif
|
|
}
|
|
|
|
if (uhp == NULL) /* no undo at all */
|
|
{
|
|
if (old_curhead != NULL)
|
|
u_freebranch(curbuf, old_curhead, NULL);
|
|
curbuf->b_u_synced = FALSE;
|
|
return OK;
|
|
}
|
|
|
|
uhp->uh_prev.ptr = NULL;
|
|
uhp->uh_next.ptr = curbuf->b_u_newhead;
|
|
uhp->uh_alt_next.ptr = old_curhead;
|
|
if (old_curhead != NULL)
|
|
{
|
|
uhp->uh_alt_prev.ptr = old_curhead->uh_alt_prev.ptr;
|
|
if (uhp->uh_alt_prev.ptr != NULL)
|
|
uhp->uh_alt_prev.ptr->uh_alt_next.ptr = uhp;
|
|
old_curhead->uh_alt_prev.ptr = uhp;
|
|
if (curbuf->b_u_oldhead == old_curhead)
|
|
curbuf->b_u_oldhead = uhp;
|
|
}
|
|
else
|
|
uhp->uh_alt_prev.ptr = NULL;
|
|
if (curbuf->b_u_newhead != NULL)
|
|
curbuf->b_u_newhead->uh_prev.ptr = uhp;
|
|
|
|
uhp->uh_seq = ++curbuf->b_u_seq_last;
|
|
curbuf->b_u_seq_cur = uhp->uh_seq;
|
|
uhp->uh_time = vim_time();
|
|
uhp->uh_save_nr = 0;
|
|
curbuf->b_u_time_cur = uhp->uh_time + 1;
|
|
|
|
uhp->uh_walk = 0;
|
|
uhp->uh_entry = NULL;
|
|
uhp->uh_getbot_entry = NULL;
|
|
uhp->uh_cursor = curwin->w_cursor; /* save cursor pos. for undo */
|
|
#ifdef FEAT_VIRTUALEDIT
|
|
if (virtual_active() && curwin->w_cursor.coladd > 0)
|
|
uhp->uh_cursor_vcol = getviscol();
|
|
else
|
|
uhp->uh_cursor_vcol = -1;
|
|
#endif
|
|
|
|
/* save changed and buffer empty flag for undo */
|
|
uhp->uh_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
|
|
((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
|
|
|
|
/* save named marks and Visual marks for undo */
|
|
mch_memmove(uhp->uh_namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
|
|
uhp->uh_visual = curbuf->b_visual;
|
|
|
|
curbuf->b_u_newhead = uhp;
|
|
if (curbuf->b_u_oldhead == NULL)
|
|
curbuf->b_u_oldhead = uhp;
|
|
++curbuf->b_u_numhead;
|
|
}
|
|
else
|
|
{
|
|
if (get_undolevel() < 0) /* no undo at all */
|
|
return OK;
|
|
|
|
/*
|
|
* When saving a single line, and it has been saved just before, it
|
|
* doesn't make sense saving it again. Saves a lot of memory when
|
|
* making lots of changes inside the same line.
|
|
* This is only possible if the previous change didn't increase or
|
|
* decrease the number of lines.
|
|
* Check the ten last changes. More doesn't make sense and takes too
|
|
* long.
|
|
*/
|
|
if (size == 1)
|
|
{
|
|
uep = u_get_headentry();
|
|
prev_uep = NULL;
|
|
for (i = 0; i < 10; ++i)
|
|
{
|
|
if (uep == NULL)
|
|
break;
|
|
|
|
/* If lines have been inserted/deleted we give up.
|
|
* Also when the line was included in a multi-line save. */
|
|
if ((curbuf->b_u_newhead->uh_getbot_entry != uep
|
|
? (uep->ue_top + uep->ue_size + 1
|
|
!= (uep->ue_bot == 0
|
|
? curbuf->b_ml.ml_line_count + 1
|
|
: uep->ue_bot))
|
|
: uep->ue_lcount != curbuf->b_ml.ml_line_count)
|
|
|| (uep->ue_size > 1
|
|
&& top >= uep->ue_top
|
|
&& top + 2 <= uep->ue_top + uep->ue_size + 1))
|
|
break;
|
|
|
|
/* If it's the same line we can skip saving it again. */
|
|
if (uep->ue_size == 1 && uep->ue_top == top)
|
|
{
|
|
if (i > 0)
|
|
{
|
|
/* It's not the last entry: get ue_bot for the last
|
|
* entry now. Following deleted/inserted lines go to
|
|
* the re-used entry. */
|
|
u_getbot();
|
|
curbuf->b_u_synced = FALSE;
|
|
|
|
/* Move the found entry to become the last entry. The
|
|
* order of undo/redo doesn't matter for the entries
|
|
* we move it over, since they don't change the line
|
|
* count and don't include this line. It does matter
|
|
* for the found entry if the line count is changed by
|
|
* the executed command. */
|
|
prev_uep->ue_next = uep->ue_next;
|
|
uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
curbuf->b_u_newhead->uh_entry = uep;
|
|
}
|
|
|
|
/* The executed command may change the line count. */
|
|
if (newbot != 0)
|
|
uep->ue_bot = newbot;
|
|
else if (bot > curbuf->b_ml.ml_line_count)
|
|
uep->ue_bot = 0;
|
|
else
|
|
{
|
|
uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
}
|
|
return OK;
|
|
}
|
|
prev_uep = uep;
|
|
uep = uep->ue_next;
|
|
}
|
|
}
|
|
|
|
/* find line number for ue_bot for previous u_save() */
|
|
u_getbot();
|
|
}
|
|
|
|
#if !defined(UNIX) && !defined(WIN32)
|
|
/*
|
|
* With Amiga we can't handle big undo's, because
|
|
* then u_alloc_line would have to allocate a block larger than 32K
|
|
*/
|
|
if (size >= 8000)
|
|
goto nomem;
|
|
#endif
|
|
|
|
/*
|
|
* add lines in front of entry list
|
|
*/
|
|
uep = (u_entry_T *)U_ALLOC_LINE(sizeof(u_entry_T));
|
|
if (uep == NULL)
|
|
goto nomem;
|
|
vim_memset(uep, 0, sizeof(u_entry_T));
|
|
#ifdef U_DEBUG
|
|
uep->ue_magic = UE_MAGIC;
|
|
#endif
|
|
|
|
uep->ue_size = size;
|
|
uep->ue_top = top;
|
|
if (newbot != 0)
|
|
uep->ue_bot = newbot;
|
|
/*
|
|
* Use 0 for ue_bot if bot is below last line.
|
|
* Otherwise we have to compute ue_bot later.
|
|
*/
|
|
else if (bot > curbuf->b_ml.ml_line_count)
|
|
uep->ue_bot = 0;
|
|
else
|
|
{
|
|
uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
}
|
|
|
|
if (size > 0)
|
|
{
|
|
if ((uep->ue_array = (char_u **)U_ALLOC_LINE(
|
|
sizeof(char_u *) * size)) == NULL)
|
|
{
|
|
u_freeentry(uep, 0L);
|
|
goto nomem;
|
|
}
|
|
for (i = 0, lnum = top + 1; i < size; ++i)
|
|
{
|
|
fast_breakcheck();
|
|
if (got_int)
|
|
{
|
|
u_freeentry(uep, i);
|
|
return FAIL;
|
|
}
|
|
if ((uep->ue_array[i] = u_save_line(lnum++)) == NULL)
|
|
{
|
|
u_freeentry(uep, i);
|
|
goto nomem;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
uep->ue_array = NULL;
|
|
uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
curbuf->b_u_newhead->uh_entry = uep;
|
|
curbuf->b_u_synced = FALSE;
|
|
undo_undoes = FALSE;
|
|
|
|
#ifdef U_DEBUG
|
|
u_check(FALSE);
|
|
#endif
|
|
return OK;
|
|
|
|
nomem:
|
|
msg_silent = 0; /* must display the prompt */
|
|
if (ask_yesno((char_u *)_("No undo possible; continue anyway"), TRUE)
|
|
== 'y')
|
|
{
|
|
undo_off = TRUE; /* will be reset when character typed */
|
|
return OK;
|
|
}
|
|
do_outofmem_msg((long_u)0);
|
|
return FAIL;
|
|
}
|
|
|
|
#if defined(FEAT_PERSISTENT_UNDO) || defined(PROTO)
|
|
|
|
# define UF_START_MAGIC "Vim\237UnDo\345" /* magic at start of undofile */
|
|
# define UF_START_MAGIC_LEN 9
|
|
# define UF_HEADER_MAGIC 0x5fd0 /* magic at start of header */
|
|
# define UF_HEADER_END_MAGIC 0xe7aa /* magic after last header */
|
|
# define UF_ENTRY_MAGIC 0xf518 /* magic at start of entry */
|
|
# define UF_ENTRY_END_MAGIC 0x3581 /* magic after last entry */
|
|
# define UF_VERSION 2 /* 2-byte undofile version number */
|
|
# define UF_VERSION_CRYPT 0x8002 /* idem, encrypted */
|
|
|
|
/* extra fields for header */
|
|
# define UF_LAST_SAVE_NR 1
|
|
|
|
/* extra fields for uhp */
|
|
# define UHP_SAVE_NR 1
|
|
|
|
static char_u e_not_open[] = N_("E828: Cannot open undo file for writing: %s");
|
|
|
|
/*
|
|
* Compute the hash for the current buffer text into hash[UNDO_HASH_SIZE].
|
|
*/
|
|
void
|
|
u_compute_hash(char_u *hash)
|
|
{
|
|
context_sha256_T ctx;
|
|
linenr_T lnum;
|
|
char_u *p;
|
|
|
|
sha256_start(&ctx);
|
|
for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
|
|
{
|
|
p = ml_get(lnum);
|
|
sha256_update(&ctx, p, (UINT32_T)(STRLEN(p) + 1));
|
|
}
|
|
sha256_finish(&ctx, hash);
|
|
}
|
|
|
|
/*
|
|
* Return an allocated string of the full path of the target undofile.
|
|
* When "reading" is TRUE find the file to read, go over all directories in
|
|
* 'undodir'.
|
|
* When "reading" is FALSE use the first name where the directory exists.
|
|
* Returns NULL when there is no place to write or no file to read.
|
|
*/
|
|
char_u *
|
|
u_get_undo_file_name(char_u *buf_ffname, int reading)
|
|
{
|
|
char_u *dirp;
|
|
char_u dir_name[IOSIZE + 1];
|
|
char_u *munged_name = NULL;
|
|
char_u *undo_file_name = NULL;
|
|
int dir_len;
|
|
char_u *p;
|
|
stat_T st;
|
|
char_u *ffname = buf_ffname;
|
|
#ifdef HAVE_READLINK
|
|
char_u fname_buf[MAXPATHL];
|
|
#endif
|
|
|
|
if (ffname == NULL)
|
|
return NULL;
|
|
|
|
#ifdef HAVE_READLINK
|
|
/* Expand symlink in the file name, so that we put the undo file with the
|
|
* actual file instead of with the symlink. */
|
|
if (resolve_symlink(ffname, fname_buf) == OK)
|
|
ffname = fname_buf;
|
|
#endif
|
|
|
|
/* Loop over 'undodir'. When reading find the first file that exists.
|
|
* When not reading use the first directory that exists or ".". */
|
|
dirp = p_udir;
|
|
while (*dirp != NUL)
|
|
{
|
|
dir_len = copy_option_part(&dirp, dir_name, IOSIZE, ",");
|
|
if (dir_len == 1 && dir_name[0] == '.')
|
|
{
|
|
/* Use same directory as the ffname,
|
|
* "dir/name" -> "dir/.name.un~" */
|
|
undo_file_name = vim_strnsave(ffname, (int)(STRLEN(ffname) + 5));
|
|
if (undo_file_name == NULL)
|
|
break;
|
|
p = gettail(undo_file_name);
|
|
#ifdef VMS
|
|
/* VMS can not handle more than one dot in the filenames
|
|
* use "dir/name" -> "dir/_un_name" - add _un_
|
|
* at the beginning to keep the extension */
|
|
mch_memmove(p + 4, p, STRLEN(p) + 1);
|
|
mch_memmove(p, "_un_", 4);
|
|
|
|
#else
|
|
/* Use same directory as the ffname,
|
|
* "dir/name" -> "dir/.name.un~" */
|
|
mch_memmove(p + 1, p, STRLEN(p) + 1);
|
|
*p = '.';
|
|
STRCAT(p, ".un~");
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
dir_name[dir_len] = NUL;
|
|
if (mch_isdir(dir_name))
|
|
{
|
|
if (munged_name == NULL)
|
|
{
|
|
munged_name = vim_strsave(ffname);
|
|
if (munged_name == NULL)
|
|
return NULL;
|
|
for (p = munged_name; *p != NUL; MB_PTR_ADV(p))
|
|
if (vim_ispathsep(*p))
|
|
*p = '%';
|
|
}
|
|
undo_file_name = concat_fnames(dir_name, munged_name, TRUE);
|
|
}
|
|
}
|
|
|
|
/* When reading check if the file exists. */
|
|
if (undo_file_name != NULL && (!reading
|
|
|| mch_stat((char *)undo_file_name, &st) >= 0))
|
|
break;
|
|
VIM_CLEAR(undo_file_name);
|
|
}
|
|
|
|
vim_free(munged_name);
|
|
return undo_file_name;
|
|
}
|
|
|
|
static void
|
|
corruption_error(char *mesg, char_u *file_name)
|
|
{
|
|
EMSG3(_("E825: Corrupted undo file (%s): %s"), mesg, file_name);
|
|
}
|
|
|
|
static void
|
|
u_free_uhp(u_header_T *uhp)
|
|
{
|
|
u_entry_T *nuep;
|
|
u_entry_T *uep;
|
|
|
|
uep = uhp->uh_entry;
|
|
while (uep != NULL)
|
|
{
|
|
nuep = uep->ue_next;
|
|
u_freeentry(uep, uep->ue_size);
|
|
uep = nuep;
|
|
}
|
|
vim_free(uhp);
|
|
}
|
|
|
|
/*
|
|
* Write a sequence of bytes to the undo file.
|
|
* Buffers and encrypts as needed.
|
|
* Returns OK or FAIL.
|
|
*/
|
|
static int
|
|
undo_write(bufinfo_T *bi, char_u *ptr, size_t len)
|
|
{
|
|
#ifdef FEAT_CRYPT
|
|
if (bi->bi_buffer != NULL)
|
|
{
|
|
size_t len_todo = len;
|
|
char_u *p = ptr;
|
|
|
|
while (bi->bi_used + len_todo >= CRYPT_BUF_SIZE)
|
|
{
|
|
size_t n = CRYPT_BUF_SIZE - bi->bi_used;
|
|
|
|
mch_memmove(bi->bi_buffer + bi->bi_used, p, n);
|
|
len_todo -= n;
|
|
p += n;
|
|
bi->bi_used = CRYPT_BUF_SIZE;
|
|
if (undo_flush(bi) == FAIL)
|
|
return FAIL;
|
|
}
|
|
if (len_todo > 0)
|
|
{
|
|
mch_memmove(bi->bi_buffer + bi->bi_used, p, len_todo);
|
|
bi->bi_used += len_todo;
|
|
}
|
|
return OK;
|
|
}
|
|
#endif
|
|
if (fwrite(ptr, len, (size_t)1, bi->bi_fp) != 1)
|
|
return FAIL;
|
|
return OK;
|
|
}
|
|
|
|
#ifdef FEAT_CRYPT
|
|
static int
|
|
undo_flush(bufinfo_T *bi)
|
|
{
|
|
if (bi->bi_buffer != NULL && bi->bi_state != NULL && bi->bi_used > 0)
|
|
{
|
|
crypt_encode_inplace(bi->bi_state, bi->bi_buffer, bi->bi_used);
|
|
if (fwrite(bi->bi_buffer, bi->bi_used, (size_t)1, bi->bi_fp) != 1)
|
|
return FAIL;
|
|
bi->bi_used = 0;
|
|
}
|
|
return OK;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Write "ptr[len]" and crypt the bytes when needed.
|
|
* Returns OK or FAIL.
|
|
*/
|
|
static int
|
|
fwrite_crypt(bufinfo_T *bi, char_u *ptr, size_t len)
|
|
{
|
|
#ifdef FEAT_CRYPT
|
|
char_u *copy;
|
|
char_u small_buf[100];
|
|
size_t i;
|
|
|
|
if (bi->bi_state != NULL && bi->bi_buffer == NULL)
|
|
{
|
|
/* crypting every piece of text separately */
|
|
if (len < 100)
|
|
copy = small_buf; /* no malloc()/free() for short strings */
|
|
else
|
|
{
|
|
copy = lalloc(len, FALSE);
|
|
if (copy == NULL)
|
|
return 0;
|
|
}
|
|
crypt_encode(bi->bi_state, ptr, len, copy);
|
|
i = fwrite(copy, len, (size_t)1, bi->bi_fp);
|
|
if (copy != small_buf)
|
|
vim_free(copy);
|
|
return i == 1 ? OK : FAIL;
|
|
}
|
|
#endif
|
|
return undo_write(bi, ptr, len);
|
|
}
|
|
|
|
/*
|
|
* Write a number, MSB first, in "len" bytes.
|
|
* Must match with undo_read_?c() functions.
|
|
* Returns OK or FAIL.
|
|
*/
|
|
static int
|
|
undo_write_bytes(bufinfo_T *bi, long_u nr, int len)
|
|
{
|
|
char_u buf[8];
|
|
int i;
|
|
int bufi = 0;
|
|
|
|
for (i = len - 1; i >= 0; --i)
|
|
buf[bufi++] = (char_u)(nr >> (i * 8));
|
|
return undo_write(bi, buf, (size_t)len);
|
|
}
|
|
|
|
/*
|
|
* Write the pointer to an undo header. Instead of writing the pointer itself
|
|
* we use the sequence number of the header. This is converted back to
|
|
* pointers when reading. */
|
|
static void
|
|
put_header_ptr(bufinfo_T *bi, u_header_T *uhp)
|
|
{
|
|
undo_write_bytes(bi, (long_u)(uhp != NULL ? uhp->uh_seq : 0), 4);
|
|
}
|
|
|
|
static int
|
|
undo_read_4c(bufinfo_T *bi)
|
|
{
|
|
#ifdef FEAT_CRYPT
|
|
if (bi->bi_buffer != NULL)
|
|
{
|
|
char_u buf[4];
|
|
int n;
|
|
|
|
undo_read(bi, buf, (size_t)4);
|
|
n = ((unsigned)buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3];
|
|
return n;
|
|
}
|
|
#endif
|
|
return get4c(bi->bi_fp);
|
|
}
|
|
|
|
static int
|
|
undo_read_2c(bufinfo_T *bi)
|
|
{
|
|
#ifdef FEAT_CRYPT
|
|
if (bi->bi_buffer != NULL)
|
|
{
|
|
char_u buf[2];
|
|
int n;
|
|
|
|
undo_read(bi, buf, (size_t)2);
|
|
n = (buf[0] << 8) + buf[1];
|
|
return n;
|
|
}
|
|
#endif
|
|
return get2c(bi->bi_fp);
|
|
}
|
|
|
|
static int
|
|
undo_read_byte(bufinfo_T *bi)
|
|
{
|
|
#ifdef FEAT_CRYPT
|
|
if (bi->bi_buffer != NULL)
|
|
{
|
|
char_u buf[1];
|
|
|
|
undo_read(bi, buf, (size_t)1);
|
|
return buf[0];
|
|
}
|
|
#endif
|
|
return getc(bi->bi_fp);
|
|
}
|
|
|
|
static time_t
|
|
undo_read_time(bufinfo_T *bi)
|
|
{
|
|
#ifdef FEAT_CRYPT
|
|
if (bi->bi_buffer != NULL)
|
|
{
|
|
char_u buf[8];
|
|
time_t n = 0;
|
|
int i;
|
|
|
|
undo_read(bi, buf, (size_t)8);
|
|
for (i = 0; i < 8; ++i)
|
|
n = (n << 8) + buf[i];
|
|
return n;
|
|
}
|
|
#endif
|
|
return get8ctime(bi->bi_fp);
|
|
}
|
|
|
|
/*
|
|
* Read "buffer[size]" from the undo file.
|
|
* Return OK or FAIL.
|
|
*/
|
|
static int
|
|
undo_read(bufinfo_T *bi, char_u *buffer, size_t size)
|
|
{
|
|
int retval = OK;
|
|
|
|
#ifdef FEAT_CRYPT
|
|
if (bi->bi_buffer != NULL)
|
|
{
|
|
int size_todo = (int)size;
|
|
char_u *p = buffer;
|
|
|
|
while (size_todo > 0)
|
|
{
|
|
size_t n;
|
|
|
|
if (bi->bi_used >= bi->bi_avail)
|
|
{
|
|
n = fread(bi->bi_buffer, 1, (size_t)CRYPT_BUF_SIZE, bi->bi_fp);
|
|
if (n == 0)
|
|
{
|
|
retval = FAIL;
|
|
break;
|
|
}
|
|
bi->bi_avail = n;
|
|
bi->bi_used = 0;
|
|
crypt_decode_inplace(bi->bi_state, bi->bi_buffer, bi->bi_avail);
|
|
}
|
|
n = size_todo;
|
|
if (n > bi->bi_avail - bi->bi_used)
|
|
n = bi->bi_avail - bi->bi_used;
|
|
mch_memmove(p, bi->bi_buffer + bi->bi_used, n);
|
|
bi->bi_used += n;
|
|
size_todo -= (int)n;
|
|
p += n;
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
if (fread(buffer, (size_t)size, 1, bi->bi_fp) != 1)
|
|
retval = FAIL;
|
|
|
|
if (retval == FAIL)
|
|
/* Error may be checked for only later. Fill with zeros,
|
|
* so that the reader won't use garbage. */
|
|
vim_memset(buffer, 0, size);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Read a string of length "len" from "bi->bi_fd".
|
|
* "len" can be zero to allocate an empty line.
|
|
* Decrypt the bytes if needed.
|
|
* Append a NUL.
|
|
* Returns a pointer to allocated memory or NULL for failure.
|
|
*/
|
|
static char_u *
|
|
read_string_decrypt(bufinfo_T *bi, int len)
|
|
{
|
|
char_u *ptr = alloc((unsigned)len + 1);
|
|
|
|
if (ptr != NULL)
|
|
{
|
|
if (len > 0 && undo_read(bi, ptr, len) == FAIL)
|
|
{
|
|
vim_free(ptr);
|
|
return NULL;
|
|
}
|
|
ptr[len] = NUL;
|
|
#ifdef FEAT_CRYPT
|
|
if (bi->bi_state != NULL && bi->bi_buffer == NULL)
|
|
crypt_decode_inplace(bi->bi_state, ptr, len);
|
|
#endif
|
|
}
|
|
return ptr;
|
|
}
|
|
|
|
/*
|
|
* Writes the (not encrypted) header and initializes encryption if needed.
|
|
*/
|
|
static int
|
|
serialize_header(bufinfo_T *bi, char_u *hash)
|
|
{
|
|
int len;
|
|
buf_T *buf = bi->bi_buf;
|
|
FILE *fp = bi->bi_fp;
|
|
char_u time_buf[8];
|
|
|
|
/* Start writing, first the magic marker and undo info version. */
|
|
if (fwrite(UF_START_MAGIC, (size_t)UF_START_MAGIC_LEN, (size_t)1, fp) != 1)
|
|
return FAIL;
|
|
|
|
/* If the buffer is encrypted then all text bytes following will be
|
|
* encrypted. Numbers and other info is not crypted. */
|
|
#ifdef FEAT_CRYPT
|
|
if (*buf->b_p_key != NUL)
|
|
{
|
|
char_u *header;
|
|
int header_len;
|
|
|
|
undo_write_bytes(bi, (long_u)UF_VERSION_CRYPT, 2);
|
|
bi->bi_state = crypt_create_for_writing(crypt_get_method_nr(buf),
|
|
buf->b_p_key, &header, &header_len);
|
|
if (bi->bi_state == NULL)
|
|
return FAIL;
|
|
len = (int)fwrite(header, (size_t)header_len, (size_t)1, fp);
|
|
vim_free(header);
|
|
if (len != 1)
|
|
{
|
|
crypt_free_state(bi->bi_state);
|
|
bi->bi_state = NULL;
|
|
return FAIL;
|
|
}
|
|
|
|
if (crypt_whole_undofile(crypt_get_method_nr(buf)))
|
|
{
|
|
bi->bi_buffer = alloc(CRYPT_BUF_SIZE);
|
|
if (bi->bi_buffer == NULL)
|
|
{
|
|
crypt_free_state(bi->bi_state);
|
|
bi->bi_state = NULL;
|
|
return FAIL;
|
|
}
|
|
bi->bi_used = 0;
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
undo_write_bytes(bi, (long_u)UF_VERSION, 2);
|
|
|
|
|
|
/* Write a hash of the buffer text, so that we can verify it is still the
|
|
* same when reading the buffer text. */
|
|
if (undo_write(bi, hash, (size_t)UNDO_HASH_SIZE) == FAIL)
|
|
return FAIL;
|
|
|
|
/* buffer-specific data */
|
|
undo_write_bytes(bi, (long_u)buf->b_ml.ml_line_count, 4);
|
|
len = buf->b_u_line_ptr != NULL ? (int)STRLEN(buf->b_u_line_ptr) : 0;
|
|
undo_write_bytes(bi, (long_u)len, 4);
|
|
if (len > 0 && fwrite_crypt(bi, buf->b_u_line_ptr, (size_t)len) == FAIL)
|
|
return FAIL;
|
|
undo_write_bytes(bi, (long_u)buf->b_u_line_lnum, 4);
|
|
undo_write_bytes(bi, (long_u)buf->b_u_line_colnr, 4);
|
|
|
|
/* Undo structures header data */
|
|
put_header_ptr(bi, buf->b_u_oldhead);
|
|
put_header_ptr(bi, buf->b_u_newhead);
|
|
put_header_ptr(bi, buf->b_u_curhead);
|
|
|
|
undo_write_bytes(bi, (long_u)buf->b_u_numhead, 4);
|
|
undo_write_bytes(bi, (long_u)buf->b_u_seq_last, 4);
|
|
undo_write_bytes(bi, (long_u)buf->b_u_seq_cur, 4);
|
|
time_to_bytes(buf->b_u_time_cur, time_buf);
|
|
undo_write(bi, time_buf, 8);
|
|
|
|
/* Optional fields. */
|
|
undo_write_bytes(bi, 4, 1);
|
|
undo_write_bytes(bi, UF_LAST_SAVE_NR, 1);
|
|
undo_write_bytes(bi, (long_u)buf->b_u_save_nr_last, 4);
|
|
|
|
undo_write_bytes(bi, 0, 1); /* end marker */
|
|
|
|
return OK;
|
|
}
|
|
|
|
static int
|
|
serialize_uhp(bufinfo_T *bi, u_header_T *uhp)
|
|
{
|
|
int i;
|
|
u_entry_T *uep;
|
|
char_u time_buf[8];
|
|
|
|
if (undo_write_bytes(bi, (long_u)UF_HEADER_MAGIC, 2) == FAIL)
|
|
return FAIL;
|
|
|
|
put_header_ptr(bi, uhp->uh_next.ptr);
|
|
put_header_ptr(bi, uhp->uh_prev.ptr);
|
|
put_header_ptr(bi, uhp->uh_alt_next.ptr);
|
|
put_header_ptr(bi, uhp->uh_alt_prev.ptr);
|
|
undo_write_bytes(bi, uhp->uh_seq, 4);
|
|
serialize_pos(bi, uhp->uh_cursor);
|
|
#ifdef FEAT_VIRTUALEDIT
|
|
undo_write_bytes(bi, (long_u)uhp->uh_cursor_vcol, 4);
|
|
#else
|
|
undo_write_bytes(bi, (long_u)0, 4);
|
|
#endif
|
|
undo_write_bytes(bi, (long_u)uhp->uh_flags, 2);
|
|
/* Assume NMARKS will stay the same. */
|
|
for (i = 0; i < NMARKS; ++i)
|
|
serialize_pos(bi, uhp->uh_namedm[i]);
|
|
serialize_visualinfo(bi, &uhp->uh_visual);
|
|
time_to_bytes(uhp->uh_time, time_buf);
|
|
undo_write(bi, time_buf, 8);
|
|
|
|
/* Optional fields. */
|
|
undo_write_bytes(bi, 4, 1);
|
|
undo_write_bytes(bi, UHP_SAVE_NR, 1);
|
|
undo_write_bytes(bi, (long_u)uhp->uh_save_nr, 4);
|
|
|
|
undo_write_bytes(bi, 0, 1); /* end marker */
|
|
|
|
/* Write all the entries. */
|
|
for (uep = uhp->uh_entry; uep != NULL; uep = uep->ue_next)
|
|
{
|
|
undo_write_bytes(bi, (long_u)UF_ENTRY_MAGIC, 2);
|
|
if (serialize_uep(bi, uep) == FAIL)
|
|
return FAIL;
|
|
}
|
|
undo_write_bytes(bi, (long_u)UF_ENTRY_END_MAGIC, 2);
|
|
return OK;
|
|
}
|
|
|
|
static u_header_T *
|
|
unserialize_uhp(bufinfo_T *bi, char_u *file_name)
|
|
{
|
|
u_header_T *uhp;
|
|
int i;
|
|
u_entry_T *uep, *last_uep;
|
|
int c;
|
|
int error;
|
|
|
|
uhp = (u_header_T *)U_ALLOC_LINE(sizeof(u_header_T));
|
|
if (uhp == NULL)
|
|
return NULL;
|
|
vim_memset(uhp, 0, sizeof(u_header_T));
|
|
#ifdef U_DEBUG
|
|
uhp->uh_magic = UH_MAGIC;
|
|
#endif
|
|
uhp->uh_next.seq = undo_read_4c(bi);
|
|
uhp->uh_prev.seq = undo_read_4c(bi);
|
|
uhp->uh_alt_next.seq = undo_read_4c(bi);
|
|
uhp->uh_alt_prev.seq = undo_read_4c(bi);
|
|
uhp->uh_seq = undo_read_4c(bi);
|
|
if (uhp->uh_seq <= 0)
|
|
{
|
|
corruption_error("uh_seq", file_name);
|
|
vim_free(uhp);
|
|
return NULL;
|
|
}
|
|
unserialize_pos(bi, &uhp->uh_cursor);
|
|
#ifdef FEAT_VIRTUALEDIT
|
|
uhp->uh_cursor_vcol = undo_read_4c(bi);
|
|
#else
|
|
(void)undo_read_4c(bi);
|
|
#endif
|
|
uhp->uh_flags = undo_read_2c(bi);
|
|
for (i = 0; i < NMARKS; ++i)
|
|
unserialize_pos(bi, &uhp->uh_namedm[i]);
|
|
unserialize_visualinfo(bi, &uhp->uh_visual);
|
|
uhp->uh_time = undo_read_time(bi);
|
|
|
|
/* Optional fields. */
|
|
for (;;)
|
|
{
|
|
int len = undo_read_byte(bi);
|
|
int what;
|
|
|
|
if (len == 0)
|
|
break;
|
|
what = undo_read_byte(bi);
|
|
switch (what)
|
|
{
|
|
case UHP_SAVE_NR:
|
|
uhp->uh_save_nr = undo_read_4c(bi);
|
|
break;
|
|
default:
|
|
/* field not supported, skip */
|
|
while (--len >= 0)
|
|
(void)undo_read_byte(bi);
|
|
}
|
|
}
|
|
|
|
/* Unserialize the uep list. */
|
|
last_uep = NULL;
|
|
while ((c = undo_read_2c(bi)) == UF_ENTRY_MAGIC)
|
|
{
|
|
error = FALSE;
|
|
uep = unserialize_uep(bi, &error, file_name);
|
|
if (last_uep == NULL)
|
|
uhp->uh_entry = uep;
|
|
else
|
|
last_uep->ue_next = uep;
|
|
last_uep = uep;
|
|
if (uep == NULL || error)
|
|
{
|
|
u_free_uhp(uhp);
|
|
return NULL;
|
|
}
|
|
}
|
|
if (c != UF_ENTRY_END_MAGIC)
|
|
{
|
|
corruption_error("entry end", file_name);
|
|
u_free_uhp(uhp);
|
|
return NULL;
|
|
}
|
|
|
|
return uhp;
|
|
}
|
|
|
|
/*
|
|
* Serialize "uep".
|
|
*/
|
|
static int
|
|
serialize_uep(
|
|
bufinfo_T *bi,
|
|
u_entry_T *uep)
|
|
{
|
|
int i;
|
|
size_t len;
|
|
|
|
undo_write_bytes(bi, (long_u)uep->ue_top, 4);
|
|
undo_write_bytes(bi, (long_u)uep->ue_bot, 4);
|
|
undo_write_bytes(bi, (long_u)uep->ue_lcount, 4);
|
|
undo_write_bytes(bi, (long_u)uep->ue_size, 4);
|
|
for (i = 0; i < uep->ue_size; ++i)
|
|
{
|
|
len = STRLEN(uep->ue_array[i]);
|
|
if (undo_write_bytes(bi, (long_u)len, 4) == FAIL)
|
|
return FAIL;
|
|
if (len > 0 && fwrite_crypt(bi, uep->ue_array[i], len) == FAIL)
|
|
return FAIL;
|
|
}
|
|
return OK;
|
|
}
|
|
|
|
static u_entry_T *
|
|
unserialize_uep(bufinfo_T *bi, int *error, char_u *file_name)
|
|
{
|
|
int i;
|
|
u_entry_T *uep;
|
|
char_u **array = NULL;
|
|
char_u *line;
|
|
int line_len;
|
|
|
|
uep = (u_entry_T *)U_ALLOC_LINE(sizeof(u_entry_T));
|
|
if (uep == NULL)
|
|
return NULL;
|
|
vim_memset(uep, 0, sizeof(u_entry_T));
|
|
#ifdef U_DEBUG
|
|
uep->ue_magic = UE_MAGIC;
|
|
#endif
|
|
uep->ue_top = undo_read_4c(bi);
|
|
uep->ue_bot = undo_read_4c(bi);
|
|
uep->ue_lcount = undo_read_4c(bi);
|
|
uep->ue_size = undo_read_4c(bi);
|
|
if (uep->ue_size > 0)
|
|
{
|
|
if (uep->ue_size < LONG_MAX / (int)sizeof(char_u *))
|
|
array = (char_u **)U_ALLOC_LINE(sizeof(char_u *) * uep->ue_size);
|
|
if (array == NULL)
|
|
{
|
|
*error = TRUE;
|
|
return uep;
|
|
}
|
|
vim_memset(array, 0, sizeof(char_u *) * uep->ue_size);
|
|
}
|
|
uep->ue_array = array;
|
|
|
|
for (i = 0; i < uep->ue_size; ++i)
|
|
{
|
|
line_len = undo_read_4c(bi);
|
|
if (line_len >= 0)
|
|
line = read_string_decrypt(bi, line_len);
|
|
else
|
|
{
|
|
line = NULL;
|
|
corruption_error("line length", file_name);
|
|
}
|
|
if (line == NULL)
|
|
{
|
|
*error = TRUE;
|
|
return uep;
|
|
}
|
|
array[i] = line;
|
|
}
|
|
return uep;
|
|
}
|
|
|
|
/*
|
|
* Serialize "pos".
|
|
*/
|
|
static void
|
|
serialize_pos(bufinfo_T *bi, pos_T pos)
|
|
{
|
|
undo_write_bytes(bi, (long_u)pos.lnum, 4);
|
|
undo_write_bytes(bi, (long_u)pos.col, 4);
|
|
#ifdef FEAT_VIRTUALEDIT
|
|
undo_write_bytes(bi, (long_u)pos.coladd, 4);
|
|
#else
|
|
undo_write_bytes(bi, (long_u)0, 4);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Unserialize the pos_T at the current position.
|
|
*/
|
|
static void
|
|
unserialize_pos(bufinfo_T *bi, pos_T *pos)
|
|
{
|
|
pos->lnum = undo_read_4c(bi);
|
|
if (pos->lnum < 0)
|
|
pos->lnum = 0;
|
|
pos->col = undo_read_4c(bi);
|
|
if (pos->col < 0)
|
|
pos->col = 0;
|
|
#ifdef FEAT_VIRTUALEDIT
|
|
pos->coladd = undo_read_4c(bi);
|
|
if (pos->coladd < 0)
|
|
pos->coladd = 0;
|
|
#else
|
|
(void)undo_read_4c(bi);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Serialize "info".
|
|
*/
|
|
static void
|
|
serialize_visualinfo(bufinfo_T *bi, visualinfo_T *info)
|
|
{
|
|
serialize_pos(bi, info->vi_start);
|
|
serialize_pos(bi, info->vi_end);
|
|
undo_write_bytes(bi, (long_u)info->vi_mode, 4);
|
|
undo_write_bytes(bi, (long_u)info->vi_curswant, 4);
|
|
}
|
|
|
|
/*
|
|
* Unserialize the visualinfo_T at the current position.
|
|
*/
|
|
static void
|
|
unserialize_visualinfo(bufinfo_T *bi, visualinfo_T *info)
|
|
{
|
|
unserialize_pos(bi, &info->vi_start);
|
|
unserialize_pos(bi, &info->vi_end);
|
|
info->vi_mode = undo_read_4c(bi);
|
|
info->vi_curswant = undo_read_4c(bi);
|
|
}
|
|
|
|
/*
|
|
* Write the undo tree in an undo file.
|
|
* When "name" is not NULL, use it as the name of the undo file.
|
|
* Otherwise use buf->b_ffname to generate the undo file name.
|
|
* "buf" must never be null, buf->b_ffname is used to obtain the original file
|
|
* permissions.
|
|
* "forceit" is TRUE for ":wundo!", FALSE otherwise.
|
|
* "hash[UNDO_HASH_SIZE]" must be the hash value of the buffer text.
|
|
*/
|
|
void
|
|
u_write_undo(
|
|
char_u *name,
|
|
int forceit,
|
|
buf_T *buf,
|
|
char_u *hash)
|
|
{
|
|
u_header_T *uhp;
|
|
char_u *file_name;
|
|
int mark;
|
|
#ifdef U_DEBUG
|
|
int headers_written = 0;
|
|
#endif
|
|
int fd;
|
|
FILE *fp = NULL;
|
|
int perm;
|
|
int write_ok = FALSE;
|
|
#ifdef UNIX
|
|
int st_old_valid = FALSE;
|
|
stat_T st_old;
|
|
stat_T st_new;
|
|
#endif
|
|
bufinfo_T bi;
|
|
|
|
vim_memset(&bi, 0, sizeof(bi));
|
|
|
|
if (name == NULL)
|
|
{
|
|
file_name = u_get_undo_file_name(buf->b_ffname, FALSE);
|
|
if (file_name == NULL)
|
|
{
|
|
if (p_verbose > 0)
|
|
{
|
|
verbose_enter();
|
|
smsg((char_u *)
|
|
_("Cannot write undo file in any directory in 'undodir'"));
|
|
verbose_leave();
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
file_name = name;
|
|
|
|
/*
|
|
* Decide about the permission to use for the undo file. If the buffer
|
|
* has a name use the permission of the original file. Otherwise only
|
|
* allow the user to access the undo file.
|
|
*/
|
|
perm = 0600;
|
|
if (buf->b_ffname != NULL)
|
|
{
|
|
#ifdef UNIX
|
|
if (mch_stat((char *)buf->b_ffname, &st_old) >= 0)
|
|
{
|
|
perm = st_old.st_mode;
|
|
st_old_valid = TRUE;
|
|
}
|
|
#else
|
|
perm = mch_getperm(buf->b_ffname);
|
|
if (perm < 0)
|
|
perm = 0600;
|
|
#endif
|
|
}
|
|
|
|
/* strip any s-bit and executable bit */
|
|
perm = perm & 0666;
|
|
|
|
/* If the undo file already exists, verify that it actually is an undo
|
|
* file, and delete it. */
|
|
if (mch_getperm(file_name) >= 0)
|
|
{
|
|
if (name == NULL || !forceit)
|
|
{
|
|
/* Check we can read it and it's an undo file. */
|
|
fd = mch_open((char *)file_name, O_RDONLY|O_EXTRA, 0);
|
|
if (fd < 0)
|
|
{
|
|
if (name != NULL || p_verbose > 0)
|
|
{
|
|
if (name == NULL)
|
|
verbose_enter();
|
|
smsg((char_u *)
|
|
_("Will not overwrite with undo file, cannot read: %s"),
|
|
file_name);
|
|
if (name == NULL)
|
|
verbose_leave();
|
|
}
|
|
goto theend;
|
|
}
|
|
else
|
|
{
|
|
char_u mbuf[UF_START_MAGIC_LEN];
|
|
int len;
|
|
|
|
len = read_eintr(fd, mbuf, UF_START_MAGIC_LEN);
|
|
close(fd);
|
|
if (len < UF_START_MAGIC_LEN
|
|
|| memcmp(mbuf, UF_START_MAGIC, UF_START_MAGIC_LEN) != 0)
|
|
{
|
|
if (name != NULL || p_verbose > 0)
|
|
{
|
|
if (name == NULL)
|
|
verbose_enter();
|
|
smsg((char_u *)
|
|
_("Will not overwrite, this is not an undo file: %s"),
|
|
file_name);
|
|
if (name == NULL)
|
|
verbose_leave();
|
|
}
|
|
goto theend;
|
|
}
|
|
}
|
|
}
|
|
mch_remove(file_name);
|
|
}
|
|
|
|
/* If there is no undo information at all, quit here after deleting any
|
|
* existing undo file. */
|
|
if (buf->b_u_numhead == 0 && buf->b_u_line_ptr == NULL)
|
|
{
|
|
if (p_verbose > 0)
|
|
verb_msg((char_u *)_("Skipping undo file write, nothing to undo"));
|
|
goto theend;
|
|
}
|
|
|
|
fd = mch_open((char *)file_name,
|
|
O_CREAT|O_EXTRA|O_WRONLY|O_EXCL|O_NOFOLLOW, perm);
|
|
if (fd < 0)
|
|
{
|
|
EMSG2(_(e_not_open), file_name);
|
|
goto theend;
|
|
}
|
|
(void)mch_setperm(file_name, perm);
|
|
if (p_verbose > 0)
|
|
{
|
|
verbose_enter();
|
|
smsg((char_u *)_("Writing undo file: %s"), file_name);
|
|
verbose_leave();
|
|
}
|
|
|
|
#ifdef U_DEBUG
|
|
/* Check there is no problem in undo info before writing. */
|
|
u_check(FALSE);
|
|
#endif
|
|
|
|
#ifdef UNIX
|
|
/*
|
|
* Try to set the group of the undo file same as the original file. If
|
|
* this fails, set the protection bits for the group same as the
|
|
* protection bits for others.
|
|
*/
|
|
if (st_old_valid
|
|
&& mch_stat((char *)file_name, &st_new) >= 0
|
|
&& st_new.st_gid != st_old.st_gid
|
|
# ifdef HAVE_FCHOWN /* sequent-ptx lacks fchown() */
|
|
&& fchown(fd, (uid_t)-1, st_old.st_gid) != 0
|
|
# endif
|
|
)
|
|
mch_setperm(file_name, (perm & 0707) | ((perm & 07) << 3));
|
|
# if defined(HAVE_SELINUX) || defined(HAVE_SMACK)
|
|
if (buf->b_ffname != NULL)
|
|
mch_copy_sec(buf->b_ffname, file_name);
|
|
# endif
|
|
#endif
|
|
|
|
fp = fdopen(fd, "w");
|
|
if (fp == NULL)
|
|
{
|
|
EMSG2(_(e_not_open), file_name);
|
|
close(fd);
|
|
mch_remove(file_name);
|
|
goto theend;
|
|
}
|
|
|
|
/* Undo must be synced. */
|
|
u_sync(TRUE);
|
|
|
|
/*
|
|
* Write the header. Initializes encryption, if enabled.
|
|
*/
|
|
bi.bi_buf = buf;
|
|
bi.bi_fp = fp;
|
|
if (serialize_header(&bi, hash) == FAIL)
|
|
goto write_error;
|
|
|
|
/*
|
|
* Iteratively serialize UHPs and their UEPs from the top down.
|
|
*/
|
|
mark = ++lastmark;
|
|
uhp = buf->b_u_oldhead;
|
|
while (uhp != NULL)
|
|
{
|
|
/* Serialize current UHP if we haven't seen it */
|
|
if (uhp->uh_walk != mark)
|
|
{
|
|
uhp->uh_walk = mark;
|
|
#ifdef U_DEBUG
|
|
++headers_written;
|
|
#endif
|
|
if (serialize_uhp(&bi, uhp) == FAIL)
|
|
goto write_error;
|
|
}
|
|
|
|
/* Now walk through the tree - algorithm from undo_time(). */
|
|
if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != mark)
|
|
uhp = uhp->uh_prev.ptr;
|
|
else if (uhp->uh_alt_next.ptr != NULL
|
|
&& uhp->uh_alt_next.ptr->uh_walk != mark)
|
|
uhp = uhp->uh_alt_next.ptr;
|
|
else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL
|
|
&& uhp->uh_next.ptr->uh_walk != mark)
|
|
uhp = uhp->uh_next.ptr;
|
|
else if (uhp->uh_alt_prev.ptr != NULL)
|
|
uhp = uhp->uh_alt_prev.ptr;
|
|
else
|
|
uhp = uhp->uh_next.ptr;
|
|
}
|
|
|
|
if (undo_write_bytes(&bi, (long_u)UF_HEADER_END_MAGIC, 2) == OK)
|
|
write_ok = TRUE;
|
|
#ifdef U_DEBUG
|
|
if (headers_written != buf->b_u_numhead)
|
|
{
|
|
EMSGN("Written %ld headers, ...", headers_written);
|
|
EMSGN("... but numhead is %ld", buf->b_u_numhead);
|
|
}
|
|
#endif
|
|
|
|
#ifdef FEAT_CRYPT
|
|
if (bi.bi_state != NULL && undo_flush(&bi) == FAIL)
|
|
write_ok = FALSE;
|
|
#endif
|
|
|
|
write_error:
|
|
fclose(fp);
|
|
if (!write_ok)
|
|
EMSG2(_("E829: write error in undo file: %s"), file_name);
|
|
|
|
#if defined(WIN3264)
|
|
/* Copy file attributes; for systems where this can only be done after
|
|
* closing the file. */
|
|
if (buf->b_ffname != NULL)
|
|
(void)mch_copy_file_attribute(buf->b_ffname, file_name);
|
|
#endif
|
|
#ifdef HAVE_ACL
|
|
if (buf->b_ffname != NULL)
|
|
{
|
|
vim_acl_T acl;
|
|
|
|
/* For systems that support ACL: get the ACL from the original file. */
|
|
acl = mch_get_acl(buf->b_ffname);
|
|
mch_set_acl(file_name, acl);
|
|
mch_free_acl(acl);
|
|
}
|
|
#endif
|
|
|
|
theend:
|
|
#ifdef FEAT_CRYPT
|
|
if (bi.bi_state != NULL)
|
|
crypt_free_state(bi.bi_state);
|
|
vim_free(bi.bi_buffer);
|
|
#endif
|
|
if (file_name != name)
|
|
vim_free(file_name);
|
|
}
|
|
|
|
/*
|
|
* Load the undo tree from an undo file.
|
|
* If "name" is not NULL use it as the undo file name. This also means being
|
|
* a bit more verbose.
|
|
* Otherwise use curbuf->b_ffname to generate the undo file name.
|
|
* "hash[UNDO_HASH_SIZE]" must be the hash value of the buffer text.
|
|
*/
|
|
void
|
|
u_read_undo(char_u *name, char_u *hash, char_u *orig_name)
|
|
{
|
|
char_u *file_name;
|
|
FILE *fp;
|
|
long version, str_len;
|
|
char_u *line_ptr = NULL;
|
|
linenr_T line_lnum;
|
|
colnr_T line_colnr;
|
|
linenr_T line_count;
|
|
long num_head = 0;
|
|
long old_header_seq, new_header_seq, cur_header_seq;
|
|
long seq_last, seq_cur;
|
|
long last_save_nr = 0;
|
|
short old_idx = -1, new_idx = -1, cur_idx = -1;
|
|
long num_read_uhps = 0;
|
|
time_t seq_time;
|
|
int i, j;
|
|
int c;
|
|
u_header_T *uhp;
|
|
u_header_T **uhp_table = NULL;
|
|
char_u read_hash[UNDO_HASH_SIZE];
|
|
char_u magic_buf[UF_START_MAGIC_LEN];
|
|
#ifdef U_DEBUG
|
|
int *uhp_table_used;
|
|
#endif
|
|
#ifdef UNIX
|
|
stat_T st_orig;
|
|
stat_T st_undo;
|
|
#endif
|
|
bufinfo_T bi;
|
|
|
|
vim_memset(&bi, 0, sizeof(bi));
|
|
if (name == NULL)
|
|
{
|
|
file_name = u_get_undo_file_name(curbuf->b_ffname, TRUE);
|
|
if (file_name == NULL)
|
|
return;
|
|
|
|
#ifdef UNIX
|
|
/* For safety we only read an undo file if the owner is equal to the
|
|
* owner of the text file or equal to the current user. */
|
|
if (mch_stat((char *)orig_name, &st_orig) >= 0
|
|
&& mch_stat((char *)file_name, &st_undo) >= 0
|
|
&& st_orig.st_uid != st_undo.st_uid
|
|
&& st_undo.st_uid != getuid())
|
|
{
|
|
if (p_verbose > 0)
|
|
{
|
|
verbose_enter();
|
|
smsg((char_u *)_("Not reading undo file, owner differs: %s"),
|
|
file_name);
|
|
verbose_leave();
|
|
}
|
|
return;
|
|
}
|
|
#endif
|
|
}
|
|
else
|
|
file_name = name;
|
|
|
|
if (p_verbose > 0)
|
|
{
|
|
verbose_enter();
|
|
smsg((char_u *)_("Reading undo file: %s"), file_name);
|
|
verbose_leave();
|
|
}
|
|
|
|
fp = mch_fopen((char *)file_name, "r");
|
|
if (fp == NULL)
|
|
{
|
|
if (name != NULL || p_verbose > 0)
|
|
EMSG2(_("E822: Cannot open undo file for reading: %s"), file_name);
|
|
goto error;
|
|
}
|
|
bi.bi_buf = curbuf;
|
|
bi.bi_fp = fp;
|
|
|
|
/*
|
|
* Read the undo file header.
|
|
*/
|
|
if (fread(magic_buf, UF_START_MAGIC_LEN, 1, fp) != 1
|
|
|| memcmp(magic_buf, UF_START_MAGIC, UF_START_MAGIC_LEN) != 0)
|
|
{
|
|
EMSG2(_("E823: Not an undo file: %s"), file_name);
|
|
goto error;
|
|
}
|
|
version = get2c(fp);
|
|
if (version == UF_VERSION_CRYPT)
|
|
{
|
|
#ifdef FEAT_CRYPT
|
|
if (*curbuf->b_p_key == NUL)
|
|
{
|
|
EMSG2(_("E832: Non-encrypted file has encrypted undo file: %s"),
|
|
file_name);
|
|
goto error;
|
|
}
|
|
bi.bi_state = crypt_create_from_file(fp, curbuf->b_p_key);
|
|
if (bi.bi_state == NULL)
|
|
{
|
|
EMSG2(_("E826: Undo file decryption failed: %s"), file_name);
|
|
goto error;
|
|
}
|
|
if (crypt_whole_undofile(bi.bi_state->method_nr))
|
|
{
|
|
bi.bi_buffer = alloc(CRYPT_BUF_SIZE);
|
|
if (bi.bi_buffer == NULL)
|
|
{
|
|
crypt_free_state(bi.bi_state);
|
|
bi.bi_state = NULL;
|
|
goto error;
|
|
}
|
|
bi.bi_avail = 0;
|
|
bi.bi_used = 0;
|
|
}
|
|
#else
|
|
EMSG2(_("E827: Undo file is encrypted: %s"), file_name);
|
|
goto error;
|
|
#endif
|
|
}
|
|
else if (version != UF_VERSION)
|
|
{
|
|
EMSG2(_("E824: Incompatible undo file: %s"), file_name);
|
|
goto error;
|
|
}
|
|
|
|
if (undo_read(&bi, read_hash, (size_t)UNDO_HASH_SIZE) == FAIL)
|
|
{
|
|
corruption_error("hash", file_name);
|
|
goto error;
|
|
}
|
|
line_count = (linenr_T)undo_read_4c(&bi);
|
|
if (memcmp(hash, read_hash, UNDO_HASH_SIZE) != 0
|
|
|| line_count != curbuf->b_ml.ml_line_count)
|
|
{
|
|
if (p_verbose > 0 || name != NULL)
|
|
{
|
|
if (name == NULL)
|
|
verbose_enter();
|
|
give_warning((char_u *)
|
|
_("File contents changed, cannot use undo info"), TRUE);
|
|
if (name == NULL)
|
|
verbose_leave();
|
|
}
|
|
goto error;
|
|
}
|
|
|
|
/* Read undo data for "U" command. */
|
|
str_len = undo_read_4c(&bi);
|
|
if (str_len < 0)
|
|
goto error;
|
|
if (str_len > 0)
|
|
line_ptr = read_string_decrypt(&bi, str_len);
|
|
line_lnum = (linenr_T)undo_read_4c(&bi);
|
|
line_colnr = (colnr_T)undo_read_4c(&bi);
|
|
if (line_lnum < 0 || line_colnr < 0)
|
|
{
|
|
corruption_error("line lnum/col", file_name);
|
|
goto error;
|
|
}
|
|
|
|
/* Begin general undo data */
|
|
old_header_seq = undo_read_4c(&bi);
|
|
new_header_seq = undo_read_4c(&bi);
|
|
cur_header_seq = undo_read_4c(&bi);
|
|
num_head = undo_read_4c(&bi);
|
|
seq_last = undo_read_4c(&bi);
|
|
seq_cur = undo_read_4c(&bi);
|
|
seq_time = undo_read_time(&bi);
|
|
|
|
/* Optional header fields. */
|
|
for (;;)
|
|
{
|
|
int len = undo_read_byte(&bi);
|
|
int what;
|
|
|
|
if (len == 0 || len == EOF)
|
|
break;
|
|
what = undo_read_byte(&bi);
|
|
switch (what)
|
|
{
|
|
case UF_LAST_SAVE_NR:
|
|
last_save_nr = undo_read_4c(&bi);
|
|
break;
|
|
default:
|
|
/* field not supported, skip */
|
|
while (--len >= 0)
|
|
(void)undo_read_byte(&bi);
|
|
}
|
|
}
|
|
|
|
/* uhp_table will store the freshly created undo headers we allocate
|
|
* until we insert them into curbuf. The table remains sorted by the
|
|
* sequence numbers of the headers.
|
|
* When there are no headers uhp_table is NULL. */
|
|
if (num_head > 0)
|
|
{
|
|
if (num_head < LONG_MAX / (long)sizeof(u_header_T *))
|
|
uhp_table = (u_header_T **)U_ALLOC_LINE(
|
|
num_head * sizeof(u_header_T *));
|
|
if (uhp_table == NULL)
|
|
goto error;
|
|
}
|
|
|
|
while ((c = undo_read_2c(&bi)) == UF_HEADER_MAGIC)
|
|
{
|
|
if (num_read_uhps >= num_head)
|
|
{
|
|
corruption_error("num_head too small", file_name);
|
|
goto error;
|
|
}
|
|
|
|
uhp = unserialize_uhp(&bi, file_name);
|
|
if (uhp == NULL)
|
|
goto error;
|
|
uhp_table[num_read_uhps++] = uhp;
|
|
}
|
|
|
|
if (num_read_uhps != num_head)
|
|
{
|
|
corruption_error("num_head", file_name);
|
|
goto error;
|
|
}
|
|
if (c != UF_HEADER_END_MAGIC)
|
|
{
|
|
corruption_error("end marker", file_name);
|
|
goto error;
|
|
}
|
|
|
|
#ifdef U_DEBUG
|
|
uhp_table_used = (int *)alloc_clear(
|
|
(unsigned)(sizeof(int) * num_head + 1));
|
|
# define SET_FLAG(j) ++uhp_table_used[j]
|
|
#else
|
|
# define SET_FLAG(j)
|
|
#endif
|
|
|
|
/* We have put all of the headers into a table. Now we iterate through the
|
|
* table and swizzle each sequence number we have stored in uh_*_seq into
|
|
* a pointer corresponding to the header with that sequence number. */
|
|
for (i = 0; i < num_head; i++)
|
|
{
|
|
uhp = uhp_table[i];
|
|
if (uhp == NULL)
|
|
continue;
|
|
for (j = 0; j < num_head; j++)
|
|
if (uhp_table[j] != NULL && i != j
|
|
&& uhp_table[i]->uh_seq == uhp_table[j]->uh_seq)
|
|
{
|
|
corruption_error("duplicate uh_seq", file_name);
|
|
goto error;
|
|
}
|
|
for (j = 0; j < num_head; j++)
|
|
if (uhp_table[j] != NULL
|
|
&& uhp_table[j]->uh_seq == uhp->uh_next.seq)
|
|
{
|
|
uhp->uh_next.ptr = uhp_table[j];
|
|
SET_FLAG(j);
|
|
break;
|
|
}
|
|
for (j = 0; j < num_head; j++)
|
|
if (uhp_table[j] != NULL
|
|
&& uhp_table[j]->uh_seq == uhp->uh_prev.seq)
|
|
{
|
|
uhp->uh_prev.ptr = uhp_table[j];
|
|
SET_FLAG(j);
|
|
break;
|
|
}
|
|
for (j = 0; j < num_head; j++)
|
|
if (uhp_table[j] != NULL
|
|
&& uhp_table[j]->uh_seq == uhp->uh_alt_next.seq)
|
|
{
|
|
uhp->uh_alt_next.ptr = uhp_table[j];
|
|
SET_FLAG(j);
|
|
break;
|
|
}
|
|
for (j = 0; j < num_head; j++)
|
|
if (uhp_table[j] != NULL
|
|
&& uhp_table[j]->uh_seq == uhp->uh_alt_prev.seq)
|
|
{
|
|
uhp->uh_alt_prev.ptr = uhp_table[j];
|
|
SET_FLAG(j);
|
|
break;
|
|
}
|
|
if (old_header_seq > 0 && old_idx < 0 && uhp->uh_seq == old_header_seq)
|
|
{
|
|
old_idx = i;
|
|
SET_FLAG(i);
|
|
}
|
|
if (new_header_seq > 0 && new_idx < 0 && uhp->uh_seq == new_header_seq)
|
|
{
|
|
new_idx = i;
|
|
SET_FLAG(i);
|
|
}
|
|
if (cur_header_seq > 0 && cur_idx < 0 && uhp->uh_seq == cur_header_seq)
|
|
{
|
|
cur_idx = i;
|
|
SET_FLAG(i);
|
|
}
|
|
}
|
|
|
|
/* Now that we have read the undo info successfully, free the current undo
|
|
* info and use the info from the file. */
|
|
u_blockfree(curbuf);
|
|
curbuf->b_u_oldhead = old_idx < 0 ? NULL : uhp_table[old_idx];
|
|
curbuf->b_u_newhead = new_idx < 0 ? NULL : uhp_table[new_idx];
|
|
curbuf->b_u_curhead = cur_idx < 0 ? NULL : uhp_table[cur_idx];
|
|
curbuf->b_u_line_ptr = line_ptr;
|
|
curbuf->b_u_line_lnum = line_lnum;
|
|
curbuf->b_u_line_colnr = line_colnr;
|
|
curbuf->b_u_numhead = num_head;
|
|
curbuf->b_u_seq_last = seq_last;
|
|
curbuf->b_u_seq_cur = seq_cur;
|
|
curbuf->b_u_time_cur = seq_time;
|
|
curbuf->b_u_save_nr_last = last_save_nr;
|
|
curbuf->b_u_save_nr_cur = last_save_nr;
|
|
|
|
curbuf->b_u_synced = TRUE;
|
|
vim_free(uhp_table);
|
|
|
|
#ifdef U_DEBUG
|
|
for (i = 0; i < num_head; ++i)
|
|
if (uhp_table_used[i] == 0)
|
|
EMSGN("uhp_table entry %ld not used, leaking memory", i);
|
|
vim_free(uhp_table_used);
|
|
u_check(TRUE);
|
|
#endif
|
|
|
|
if (name != NULL)
|
|
smsg((char_u *)_("Finished reading undo file %s"), file_name);
|
|
goto theend;
|
|
|
|
error:
|
|
vim_free(line_ptr);
|
|
if (uhp_table != NULL)
|
|
{
|
|
for (i = 0; i < num_read_uhps; i++)
|
|
if (uhp_table[i] != NULL)
|
|
u_free_uhp(uhp_table[i]);
|
|
vim_free(uhp_table);
|
|
}
|
|
|
|
theend:
|
|
#ifdef FEAT_CRYPT
|
|
if (bi.bi_state != NULL)
|
|
crypt_free_state(bi.bi_state);
|
|
vim_free(bi.bi_buffer);
|
|
#endif
|
|
if (fp != NULL)
|
|
fclose(fp);
|
|
if (file_name != name)
|
|
vim_free(file_name);
|
|
return;
|
|
}
|
|
|
|
#endif /* FEAT_PERSISTENT_UNDO */
|
|
|
|
|
|
/*
|
|
* If 'cpoptions' contains 'u': Undo the previous undo or redo (vi compatible).
|
|
* If 'cpoptions' does not contain 'u': Always undo.
|
|
*/
|
|
void
|
|
u_undo(int count)
|
|
{
|
|
/*
|
|
* If we get an undo command while executing a macro, we behave like the
|
|
* original vi. If this happens twice in one macro the result will not
|
|
* be compatible.
|
|
*/
|
|
if (curbuf->b_u_synced == FALSE)
|
|
{
|
|
u_sync(TRUE);
|
|
count = 1;
|
|
}
|
|
|
|
if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
undo_undoes = TRUE;
|
|
else
|
|
undo_undoes = !undo_undoes;
|
|
u_doit(count);
|
|
}
|
|
|
|
/*
|
|
* If 'cpoptions' contains 'u': Repeat the previous undo or redo.
|
|
* If 'cpoptions' does not contain 'u': Always redo.
|
|
*/
|
|
void
|
|
u_redo(int count)
|
|
{
|
|
if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
undo_undoes = FALSE;
|
|
u_doit(count);
|
|
}
|
|
|
|
/*
|
|
* Undo or redo, depending on 'undo_undoes', 'count' times.
|
|
*/
|
|
static void
|
|
u_doit(int startcount)
|
|
{
|
|
int count = startcount;
|
|
|
|
if (!undo_allowed())
|
|
return;
|
|
|
|
u_newcount = 0;
|
|
u_oldcount = 0;
|
|
if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
u_oldcount = -1;
|
|
while (count--)
|
|
{
|
|
/* Do the change warning now, so that it triggers FileChangedRO when
|
|
* needed. This may cause the file to be reloaded, that must happen
|
|
* before we do anything, because it may change curbuf->b_u_curhead
|
|
* and more. */
|
|
change_warning(0);
|
|
|
|
if (undo_undoes)
|
|
{
|
|
if (curbuf->b_u_curhead == NULL) /* first undo */
|
|
curbuf->b_u_curhead = curbuf->b_u_newhead;
|
|
else if (get_undolevel() > 0) /* multi level undo */
|
|
/* get next undo */
|
|
curbuf->b_u_curhead = curbuf->b_u_curhead->uh_next.ptr;
|
|
/* nothing to undo */
|
|
if (curbuf->b_u_numhead == 0 || curbuf->b_u_curhead == NULL)
|
|
{
|
|
/* stick curbuf->b_u_curhead at end */
|
|
curbuf->b_u_curhead = curbuf->b_u_oldhead;
|
|
beep_flush();
|
|
if (count == startcount - 1)
|
|
{
|
|
MSG(_("Already at oldest change"));
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
|
|
u_undoredo(TRUE);
|
|
}
|
|
else
|
|
{
|
|
if (curbuf->b_u_curhead == NULL || get_undolevel() <= 0)
|
|
{
|
|
beep_flush(); /* nothing to redo */
|
|
if (count == startcount - 1)
|
|
{
|
|
MSG(_("Already at newest change"));
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
|
|
u_undoredo(FALSE);
|
|
|
|
/* Advance for next redo. Set "newhead" when at the end of the
|
|
* redoable changes. */
|
|
if (curbuf->b_u_curhead->uh_prev.ptr == NULL)
|
|
curbuf->b_u_newhead = curbuf->b_u_curhead;
|
|
curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev.ptr;
|
|
}
|
|
}
|
|
u_undo_end(undo_undoes, FALSE);
|
|
}
|
|
|
|
/*
|
|
* Undo or redo over the timeline.
|
|
* When "step" is negative go back in time, otherwise goes forward in time.
|
|
* When "sec" is FALSE make "step" steps, when "sec" is TRUE use "step" as
|
|
* seconds.
|
|
* When "file" is TRUE use "step" as a number of file writes.
|
|
* When "absolute" is TRUE use "step" as the sequence number to jump to.
|
|
* "sec" must be FALSE then.
|
|
*/
|
|
void
|
|
undo_time(
|
|
long step,
|
|
int sec,
|
|
int file,
|
|
int absolute)
|
|
{
|
|
long target;
|
|
long closest;
|
|
long closest_start;
|
|
long closest_seq = 0;
|
|
long val;
|
|
u_header_T *uhp = NULL;
|
|
u_header_T *last;
|
|
int mark;
|
|
int nomark;
|
|
int round;
|
|
int dosec = sec;
|
|
int dofile = file;
|
|
int above = FALSE;
|
|
int did_undo = TRUE;
|
|
|
|
/* First make sure the current undoable change is synced. */
|
|
if (curbuf->b_u_synced == FALSE)
|
|
u_sync(TRUE);
|
|
|
|
u_newcount = 0;
|
|
u_oldcount = 0;
|
|
if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
u_oldcount = -1;
|
|
|
|
/* "target" is the node below which we want to be.
|
|
* Init "closest" to a value we can't reach. */
|
|
if (absolute)
|
|
{
|
|
target = step;
|
|
closest = -1;
|
|
}
|
|
else
|
|
{
|
|
if (dosec)
|
|
target = (long)(curbuf->b_u_time_cur) + step;
|
|
else if (dofile)
|
|
{
|
|
if (step < 0)
|
|
{
|
|
/* Going back to a previous write. If there were changes after
|
|
* the last write, count that as moving one file-write, so
|
|
* that ":earlier 1f" undoes all changes since the last save. */
|
|
uhp = curbuf->b_u_curhead;
|
|
if (uhp != NULL)
|
|
uhp = uhp->uh_next.ptr;
|
|
else
|
|
uhp = curbuf->b_u_newhead;
|
|
if (uhp != NULL && uhp->uh_save_nr != 0)
|
|
/* "uh_save_nr" was set in the last block, that means
|
|
* there were no changes since the last write */
|
|
target = curbuf->b_u_save_nr_cur + step;
|
|
else
|
|
/* count the changes since the last write as one step */
|
|
target = curbuf->b_u_save_nr_cur + step + 1;
|
|
if (target <= 0)
|
|
/* Go to before first write: before the oldest change. Use
|
|
* the sequence number for that. */
|
|
dofile = FALSE;
|
|
}
|
|
else
|
|
{
|
|
/* Moving forward to a newer write. */
|
|
target = curbuf->b_u_save_nr_cur + step;
|
|
if (target > curbuf->b_u_save_nr_last)
|
|
{
|
|
/* Go to after last write: after the latest change. Use
|
|
* the sequence number for that. */
|
|
target = curbuf->b_u_seq_last + 1;
|
|
dofile = FALSE;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
target = curbuf->b_u_seq_cur + step;
|
|
if (step < 0)
|
|
{
|
|
if (target < 0)
|
|
target = 0;
|
|
closest = -1;
|
|
}
|
|
else
|
|
{
|
|
if (dosec)
|
|
closest = (long)(vim_time() + 1);
|
|
else if (dofile)
|
|
closest = curbuf->b_u_save_nr_last + 2;
|
|
else
|
|
closest = curbuf->b_u_seq_last + 2;
|
|
if (target >= closest)
|
|
target = closest - 1;
|
|
}
|
|
}
|
|
closest_start = closest;
|
|
closest_seq = curbuf->b_u_seq_cur;
|
|
|
|
/* When "target" is 0; Back to origin. */
|
|
if (target == 0)
|
|
{
|
|
mark = lastmark; /* avoid that GCC complains */
|
|
goto target_zero;
|
|
}
|
|
|
|
/*
|
|
* May do this twice:
|
|
* 1. Search for "target", update "closest" to the best match found.
|
|
* 2. If "target" not found search for "closest".
|
|
*
|
|
* When using the closest time we use the sequence number in the second
|
|
* round, because there may be several entries with the same time.
|
|
*/
|
|
for (round = 1; round <= 2; ++round)
|
|
{
|
|
/* Find the path from the current state to where we want to go. The
|
|
* desired state can be anywhere in the undo tree, need to go all over
|
|
* it. We put "nomark" in uh_walk where we have been without success,
|
|
* "mark" where it could possibly be. */
|
|
mark = ++lastmark;
|
|
nomark = ++lastmark;
|
|
|
|
if (curbuf->b_u_curhead == NULL) /* at leaf of the tree */
|
|
uhp = curbuf->b_u_newhead;
|
|
else
|
|
uhp = curbuf->b_u_curhead;
|
|
|
|
while (uhp != NULL)
|
|
{
|
|
uhp->uh_walk = mark;
|
|
if (dosec)
|
|
val = (long)(uhp->uh_time);
|
|
else if (dofile)
|
|
val = uhp->uh_save_nr;
|
|
else
|
|
val = uhp->uh_seq;
|
|
|
|
if (round == 1 && !(dofile && val == 0))
|
|
{
|
|
/* Remember the header that is closest to the target.
|
|
* It must be at least in the right direction (checked with
|
|
* "b_u_seq_cur"). When the timestamp is equal find the
|
|
* highest/lowest sequence number. */
|
|
if ((step < 0 ? uhp->uh_seq <= curbuf->b_u_seq_cur
|
|
: uhp->uh_seq > curbuf->b_u_seq_cur)
|
|
&& ((dosec && val == closest)
|
|
? (step < 0
|
|
? uhp->uh_seq < closest_seq
|
|
: uhp->uh_seq > closest_seq)
|
|
: closest == closest_start
|
|
|| (val > target
|
|
? (closest > target
|
|
? val - target <= closest - target
|
|
: val - target <= target - closest)
|
|
: (closest > target
|
|
? target - val <= closest - target
|
|
: target - val <= target - closest))))
|
|
{
|
|
closest = val;
|
|
closest_seq = uhp->uh_seq;
|
|
}
|
|
}
|
|
|
|
/* Quit searching when we found a match. But when searching for a
|
|
* time we need to continue looking for the best uh_seq. */
|
|
if (target == val && !dosec)
|
|
{
|
|
target = uhp->uh_seq;
|
|
break;
|
|
}
|
|
|
|
/* go down in the tree if we haven't been there */
|
|
if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark
|
|
&& uhp->uh_prev.ptr->uh_walk != mark)
|
|
uhp = uhp->uh_prev.ptr;
|
|
|
|
/* go to alternate branch if we haven't been there */
|
|
else if (uhp->uh_alt_next.ptr != NULL
|
|
&& uhp->uh_alt_next.ptr->uh_walk != nomark
|
|
&& uhp->uh_alt_next.ptr->uh_walk != mark)
|
|
uhp = uhp->uh_alt_next.ptr;
|
|
|
|
/* go up in the tree if we haven't been there and we are at the
|
|
* start of alternate branches */
|
|
else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL
|
|
&& uhp->uh_next.ptr->uh_walk != nomark
|
|
&& uhp->uh_next.ptr->uh_walk != mark)
|
|
{
|
|
/* If still at the start we don't go through this change. */
|
|
if (uhp == curbuf->b_u_curhead)
|
|
uhp->uh_walk = nomark;
|
|
uhp = uhp->uh_next.ptr;
|
|
}
|
|
|
|
else
|
|
{
|
|
/* need to backtrack; mark this node as useless */
|
|
uhp->uh_walk = nomark;
|
|
if (uhp->uh_alt_prev.ptr != NULL)
|
|
uhp = uhp->uh_alt_prev.ptr;
|
|
else
|
|
uhp = uhp->uh_next.ptr;
|
|
}
|
|
}
|
|
|
|
if (uhp != NULL) /* found it */
|
|
break;
|
|
|
|
if (absolute)
|
|
{
|
|
EMSGN(_("E830: Undo number %ld not found"), step);
|
|
return;
|
|
}
|
|
|
|
if (closest == closest_start)
|
|
{
|
|
if (step < 0)
|
|
MSG(_("Already at oldest change"));
|
|
else
|
|
MSG(_("Already at newest change"));
|
|
return;
|
|
}
|
|
|
|
target = closest_seq;
|
|
dosec = FALSE;
|
|
dofile = FALSE;
|
|
if (step < 0)
|
|
above = TRUE; /* stop above the header */
|
|
}
|
|
|
|
target_zero:
|
|
/* If we found it: Follow the path to go to where we want to be. */
|
|
if (uhp != NULL || target == 0)
|
|
{
|
|
/*
|
|
* First go up the tree as much as needed.
|
|
*/
|
|
while (!got_int)
|
|
{
|
|
/* Do the change warning now, for the same reason as above. */
|
|
change_warning(0);
|
|
|
|
uhp = curbuf->b_u_curhead;
|
|
if (uhp == NULL)
|
|
uhp = curbuf->b_u_newhead;
|
|
else
|
|
uhp = uhp->uh_next.ptr;
|
|
if (uhp == NULL || (target > 0 && uhp->uh_walk != mark)
|
|
|| (uhp->uh_seq == target && !above))
|
|
break;
|
|
curbuf->b_u_curhead = uhp;
|
|
u_undoredo(TRUE);
|
|
if (target > 0)
|
|
uhp->uh_walk = nomark; /* don't go back down here */
|
|
}
|
|
|
|
/* When back to origin, redo is not needed. */
|
|
if (target > 0)
|
|
{
|
|
/*
|
|
* And now go down the tree (redo), branching off where needed.
|
|
*/
|
|
while (!got_int)
|
|
{
|
|
/* Do the change warning now, for the same reason as above. */
|
|
change_warning(0);
|
|
|
|
uhp = curbuf->b_u_curhead;
|
|
if (uhp == NULL)
|
|
break;
|
|
|
|
/* Go back to the first branch with a mark. */
|
|
while (uhp->uh_alt_prev.ptr != NULL
|
|
&& uhp->uh_alt_prev.ptr->uh_walk == mark)
|
|
uhp = uhp->uh_alt_prev.ptr;
|
|
|
|
/* Find the last branch with a mark, that's the one. */
|
|
last = uhp;
|
|
while (last->uh_alt_next.ptr != NULL
|
|
&& last->uh_alt_next.ptr->uh_walk == mark)
|
|
last = last->uh_alt_next.ptr;
|
|
if (last != uhp)
|
|
{
|
|
/* Make the used branch the first entry in the list of
|
|
* alternatives to make "u" and CTRL-R take this branch. */
|
|
while (uhp->uh_alt_prev.ptr != NULL)
|
|
uhp = uhp->uh_alt_prev.ptr;
|
|
if (last->uh_alt_next.ptr != NULL)
|
|
last->uh_alt_next.ptr->uh_alt_prev.ptr =
|
|
last->uh_alt_prev.ptr;
|
|
last->uh_alt_prev.ptr->uh_alt_next.ptr =
|
|
last->uh_alt_next.ptr;
|
|
last->uh_alt_prev.ptr = NULL;
|
|
last->uh_alt_next.ptr = uhp;
|
|
uhp->uh_alt_prev.ptr = last;
|
|
|
|
if (curbuf->b_u_oldhead == uhp)
|
|
curbuf->b_u_oldhead = last;
|
|
uhp = last;
|
|
if (uhp->uh_next.ptr != NULL)
|
|
uhp->uh_next.ptr->uh_prev.ptr = uhp;
|
|
}
|
|
curbuf->b_u_curhead = uhp;
|
|
|
|
if (uhp->uh_walk != mark)
|
|
break; /* must have reached the target */
|
|
|
|
/* Stop when going backwards in time and didn't find the exact
|
|
* header we were looking for. */
|
|
if (uhp->uh_seq == target && above)
|
|
{
|
|
curbuf->b_u_seq_cur = target - 1;
|
|
break;
|
|
}
|
|
|
|
u_undoredo(FALSE);
|
|
|
|
/* Advance "curhead" to below the header we last used. If it
|
|
* becomes NULL then we need to set "newhead" to this leaf. */
|
|
if (uhp->uh_prev.ptr == NULL)
|
|
curbuf->b_u_newhead = uhp;
|
|
curbuf->b_u_curhead = uhp->uh_prev.ptr;
|
|
did_undo = FALSE;
|
|
|
|
if (uhp->uh_seq == target) /* found it! */
|
|
break;
|
|
|
|
uhp = uhp->uh_prev.ptr;
|
|
if (uhp == NULL || uhp->uh_walk != mark)
|
|
{
|
|
/* Need to redo more but can't find it... */
|
|
internal_error("undo_time()");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
u_undo_end(did_undo, absolute);
|
|
}
|
|
|
|
/*
|
|
* u_undoredo: common code for undo and redo
|
|
*
|
|
* The lines in the file are replaced by the lines in the entry list at
|
|
* curbuf->b_u_curhead. The replaced lines in the file are saved in the entry
|
|
* list for the next undo/redo.
|
|
*
|
|
* When "undo" is TRUE we go up in the tree, when FALSE we go down.
|
|
*/
|
|
static void
|
|
u_undoredo(int undo)
|
|
{
|
|
char_u **newarray = NULL;
|
|
linenr_T oldsize;
|
|
linenr_T newsize;
|
|
linenr_T top, bot;
|
|
linenr_T lnum;
|
|
linenr_T newlnum = MAXLNUM;
|
|
long i;
|
|
u_entry_T *uep, *nuep;
|
|
u_entry_T *newlist = NULL;
|
|
int old_flags;
|
|
int new_flags;
|
|
pos_T namedm[NMARKS];
|
|
visualinfo_T visualinfo;
|
|
int empty_buffer; /* buffer became empty */
|
|
u_header_T *curhead = curbuf->b_u_curhead;
|
|
|
|
/* Don't want autocommands using the undo structures here, they are
|
|
* invalid till the end. */
|
|
block_autocmds();
|
|
|
|
#ifdef U_DEBUG
|
|
u_check(FALSE);
|
|
#endif
|
|
old_flags = curhead->uh_flags;
|
|
new_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
|
|
((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
|
|
setpcmark();
|
|
|
|
/*
|
|
* save marks before undo/redo
|
|
*/
|
|
mch_memmove(namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
|
|
visualinfo = curbuf->b_visual;
|
|
curbuf->b_op_start.lnum = curbuf->b_ml.ml_line_count;
|
|
curbuf->b_op_start.col = 0;
|
|
curbuf->b_op_end.lnum = 0;
|
|
curbuf->b_op_end.col = 0;
|
|
|
|
for (uep = curhead->uh_entry; uep != NULL; uep = nuep)
|
|
{
|
|
top = uep->ue_top;
|
|
bot = uep->ue_bot;
|
|
if (bot == 0)
|
|
bot = curbuf->b_ml.ml_line_count + 1;
|
|
if (top > curbuf->b_ml.ml_line_count || top >= bot
|
|
|| bot > curbuf->b_ml.ml_line_count + 1)
|
|
{
|
|
unblock_autocmds();
|
|
IEMSG(_("E438: u_undo: line numbers wrong"));
|
|
changed(); /* don't want UNCHANGED now */
|
|
return;
|
|
}
|
|
|
|
oldsize = bot - top - 1; /* number of lines before undo */
|
|
newsize = uep->ue_size; /* number of lines after undo */
|
|
|
|
if (top < newlnum)
|
|
{
|
|
/* If the saved cursor is somewhere in this undo block, move it to
|
|
* the remembered position. Makes "gwap" put the cursor back
|
|
* where it was. */
|
|
lnum = curhead->uh_cursor.lnum;
|
|
if (lnum >= top && lnum <= top + newsize + 1)
|
|
{
|
|
curwin->w_cursor = curhead->uh_cursor;
|
|
newlnum = curwin->w_cursor.lnum - 1;
|
|
}
|
|
else
|
|
{
|
|
/* Use the first line that actually changed. Avoids that
|
|
* undoing auto-formatting puts the cursor in the previous
|
|
* line. */
|
|
for (i = 0; i < newsize && i < oldsize; ++i)
|
|
if (STRCMP(uep->ue_array[i], ml_get(top + 1 + i)) != 0)
|
|
break;
|
|
if (i == newsize && newlnum == MAXLNUM && uep->ue_next == NULL)
|
|
{
|
|
newlnum = top;
|
|
curwin->w_cursor.lnum = newlnum + 1;
|
|
}
|
|
else if (i < newsize)
|
|
{
|
|
newlnum = top + i;
|
|
curwin->w_cursor.lnum = newlnum + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
empty_buffer = FALSE;
|
|
|
|
/* delete the lines between top and bot and save them in newarray */
|
|
if (oldsize > 0)
|
|
{
|
|
if ((newarray = (char_u **)U_ALLOC_LINE(
|
|
sizeof(char_u *) * oldsize)) == NULL)
|
|
{
|
|
do_outofmem_msg((long_u)(sizeof(char_u *) * oldsize));
|
|
/*
|
|
* We have messed up the entry list, repair is impossible.
|
|
* we have to free the rest of the list.
|
|
*/
|
|
while (uep != NULL)
|
|
{
|
|
nuep = uep->ue_next;
|
|
u_freeentry(uep, uep->ue_size);
|
|
uep = nuep;
|
|
}
|
|
break;
|
|
}
|
|
/* delete backwards, it goes faster in most cases */
|
|
for (lnum = bot - 1, i = oldsize; --i >= 0; --lnum)
|
|
{
|
|
/* what can we do when we run out of memory? */
|
|
if ((newarray[i] = u_save_line(lnum)) == NULL)
|
|
do_outofmem_msg((long_u)0);
|
|
/* remember we deleted the last line in the buffer, and a
|
|
* dummy empty line will be inserted */
|
|
if (curbuf->b_ml.ml_line_count == 1)
|
|
empty_buffer = TRUE;
|
|
ml_delete(lnum, FALSE);
|
|
}
|
|
}
|
|
else
|
|
newarray = NULL;
|
|
|
|
/* insert the lines in u_array between top and bot */
|
|
if (newsize)
|
|
{
|
|
for (lnum = top, i = 0; i < newsize; ++i, ++lnum)
|
|
{
|
|
/*
|
|
* If the file is empty, there is an empty line 1 that we
|
|
* should get rid of, by replacing it with the new line
|
|
*/
|
|
if (empty_buffer && lnum == 0)
|
|
ml_replace((linenr_T)1, uep->ue_array[i], TRUE);
|
|
else
|
|
ml_append(lnum, uep->ue_array[i], (colnr_T)0, FALSE);
|
|
vim_free(uep->ue_array[i]);
|
|
}
|
|
vim_free((char_u *)uep->ue_array);
|
|
}
|
|
|
|
/* adjust marks */
|
|
if (oldsize != newsize)
|
|
{
|
|
mark_adjust(top + 1, top + oldsize, (long)MAXLNUM,
|
|
(long)newsize - (long)oldsize);
|
|
if (curbuf->b_op_start.lnum > top + oldsize)
|
|
curbuf->b_op_start.lnum += newsize - oldsize;
|
|
if (curbuf->b_op_end.lnum > top + oldsize)
|
|
curbuf->b_op_end.lnum += newsize - oldsize;
|
|
}
|
|
|
|
changed_lines(top + 1, 0, bot, newsize - oldsize);
|
|
|
|
/* set '[ and '] mark */
|
|
if (top + 1 < curbuf->b_op_start.lnum)
|
|
curbuf->b_op_start.lnum = top + 1;
|
|
if (newsize == 0 && top + 1 > curbuf->b_op_end.lnum)
|
|
curbuf->b_op_end.lnum = top + 1;
|
|
else if (top + newsize > curbuf->b_op_end.lnum)
|
|
curbuf->b_op_end.lnum = top + newsize;
|
|
|
|
u_newcount += newsize;
|
|
u_oldcount += oldsize;
|
|
uep->ue_size = oldsize;
|
|
uep->ue_array = newarray;
|
|
uep->ue_bot = top + newsize + 1;
|
|
|
|
/*
|
|
* insert this entry in front of the new entry list
|
|
*/
|
|
nuep = uep->ue_next;
|
|
uep->ue_next = newlist;
|
|
newlist = uep;
|
|
}
|
|
|
|
curhead->uh_entry = newlist;
|
|
curhead->uh_flags = new_flags;
|
|
if ((old_flags & UH_EMPTYBUF) && BUFEMPTY())
|
|
curbuf->b_ml.ml_flags |= ML_EMPTY;
|
|
if (old_flags & UH_CHANGED)
|
|
changed();
|
|
else
|
|
#ifdef FEAT_NETBEANS_INTG
|
|
/* per netbeans undo rules, keep it as modified */
|
|
if (!isNetbeansModified(curbuf))
|
|
#endif
|
|
unchanged(curbuf, FALSE);
|
|
|
|
/*
|
|
* restore marks from before undo/redo
|
|
*/
|
|
for (i = 0; i < NMARKS; ++i)
|
|
{
|
|
if (curhead->uh_namedm[i].lnum != 0)
|
|
curbuf->b_namedm[i] = curhead->uh_namedm[i];
|
|
if (namedm[i].lnum != 0)
|
|
curhead->uh_namedm[i] = namedm[i];
|
|
else
|
|
curhead->uh_namedm[i].lnum = 0;
|
|
}
|
|
if (curhead->uh_visual.vi_start.lnum != 0)
|
|
{
|
|
curbuf->b_visual = curhead->uh_visual;
|
|
curhead->uh_visual = visualinfo;
|
|
}
|
|
|
|
/*
|
|
* If the cursor is only off by one line, put it at the same position as
|
|
* before starting the change (for the "o" command).
|
|
* Otherwise the cursor should go to the first undone line.
|
|
*/
|
|
if (curhead->uh_cursor.lnum + 1 == curwin->w_cursor.lnum
|
|
&& curwin->w_cursor.lnum > 1)
|
|
--curwin->w_cursor.lnum;
|
|
if (curwin->w_cursor.lnum <= curbuf->b_ml.ml_line_count)
|
|
{
|
|
if (curhead->uh_cursor.lnum == curwin->w_cursor.lnum)
|
|
{
|
|
curwin->w_cursor.col = curhead->uh_cursor.col;
|
|
#ifdef FEAT_VIRTUALEDIT
|
|
if (virtual_active() && curhead->uh_cursor_vcol >= 0)
|
|
coladvance((colnr_T)curhead->uh_cursor_vcol);
|
|
else
|
|
curwin->w_cursor.coladd = 0;
|
|
#endif
|
|
}
|
|
else
|
|
beginline(BL_SOL | BL_FIX);
|
|
}
|
|
else
|
|
{
|
|
/* We get here with the current cursor line being past the end (eg
|
|
* after adding lines at the end of the file, and then undoing it).
|
|
* check_cursor() will move the cursor to the last line. Move it to
|
|
* the first column here. */
|
|
curwin->w_cursor.col = 0;
|
|
#ifdef FEAT_VIRTUALEDIT
|
|
curwin->w_cursor.coladd = 0;
|
|
#endif
|
|
}
|
|
|
|
/* Make sure the cursor is on an existing line and column. */
|
|
check_cursor();
|
|
|
|
/* Remember where we are for "g-" and ":earlier 10s". */
|
|
curbuf->b_u_seq_cur = curhead->uh_seq;
|
|
if (undo)
|
|
{
|
|
/* We are below the previous undo. However, to make ":earlier 1s"
|
|
* work we compute this as being just above the just undone change. */
|
|
if (curhead->uh_next.ptr != NULL)
|
|
curbuf->b_u_seq_cur = curhead->uh_next.ptr->uh_seq;
|
|
else
|
|
curbuf->b_u_seq_cur = 0;
|
|
}
|
|
|
|
/* Remember where we are for ":earlier 1f" and ":later 1f". */
|
|
if (curhead->uh_save_nr != 0)
|
|
{
|
|
if (undo)
|
|
curbuf->b_u_save_nr_cur = curhead->uh_save_nr - 1;
|
|
else
|
|
curbuf->b_u_save_nr_cur = curhead->uh_save_nr;
|
|
}
|
|
|
|
/* The timestamp can be the same for multiple changes, just use the one of
|
|
* the undone/redone change. */
|
|
curbuf->b_u_time_cur = curhead->uh_time;
|
|
|
|
unblock_autocmds();
|
|
#ifdef U_DEBUG
|
|
u_check(FALSE);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* If we deleted or added lines, report the number of less/more lines.
|
|
* Otherwise, report the number of changes (this may be incorrect
|
|
* in some cases, but it's better than nothing).
|
|
*/
|
|
static void
|
|
u_undo_end(
|
|
int did_undo, /* just did an undo */
|
|
int absolute) /* used ":undo N" */
|
|
{
|
|
char *msgstr;
|
|
u_header_T *uhp;
|
|
char_u msgbuf[80];
|
|
|
|
#ifdef FEAT_FOLDING
|
|
if ((fdo_flags & FDO_UNDO) && KeyTyped)
|
|
foldOpenCursor();
|
|
#endif
|
|
|
|
if (global_busy /* no messages now, wait until global is finished */
|
|
|| !messaging()) /* 'lazyredraw' set, don't do messages now */
|
|
return;
|
|
|
|
if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
--u_newcount;
|
|
|
|
u_oldcount -= u_newcount;
|
|
if (u_oldcount == -1)
|
|
msgstr = N_("more line");
|
|
else if (u_oldcount < 0)
|
|
msgstr = N_("more lines");
|
|
else if (u_oldcount == 1)
|
|
msgstr = N_("line less");
|
|
else if (u_oldcount > 1)
|
|
msgstr = N_("fewer lines");
|
|
else
|
|
{
|
|
u_oldcount = u_newcount;
|
|
if (u_newcount == 1)
|
|
msgstr = N_("change");
|
|
else
|
|
msgstr = N_("changes");
|
|
}
|
|
|
|
if (curbuf->b_u_curhead != NULL)
|
|
{
|
|
/* For ":undo N" we prefer a "after #N" message. */
|
|
if (absolute && curbuf->b_u_curhead->uh_next.ptr != NULL)
|
|
{
|
|
uhp = curbuf->b_u_curhead->uh_next.ptr;
|
|
did_undo = FALSE;
|
|
}
|
|
else if (did_undo)
|
|
uhp = curbuf->b_u_curhead;
|
|
else
|
|
uhp = curbuf->b_u_curhead->uh_next.ptr;
|
|
}
|
|
else
|
|
uhp = curbuf->b_u_newhead;
|
|
|
|
if (uhp == NULL)
|
|
*msgbuf = NUL;
|
|
else
|
|
u_add_time(msgbuf, sizeof(msgbuf), uhp->uh_time);
|
|
|
|
#ifdef FEAT_CONCEAL
|
|
{
|
|
win_T *wp;
|
|
|
|
FOR_ALL_WINDOWS(wp)
|
|
{
|
|
if (wp->w_buffer == curbuf && wp->w_p_cole > 0)
|
|
redraw_win_later(wp, NOT_VALID);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
smsg_attr_keep(0, (char_u *)_("%ld %s; %s #%ld %s"),
|
|
u_oldcount < 0 ? -u_oldcount : u_oldcount,
|
|
_(msgstr),
|
|
did_undo ? _("before") : _("after"),
|
|
uhp == NULL ? 0L : uhp->uh_seq,
|
|
msgbuf);
|
|
}
|
|
|
|
/*
|
|
* u_sync: stop adding to the current entry list
|
|
*/
|
|
void
|
|
u_sync(
|
|
int force) /* Also sync when no_u_sync is set. */
|
|
{
|
|
/* Skip it when already synced or syncing is disabled. */
|
|
if (curbuf->b_u_synced || (!force && no_u_sync > 0))
|
|
return;
|
|
#if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
|
|
if (p_imst == IM_ON_THE_SPOT && im_is_preediting())
|
|
return; /* XIM is busy, don't break an undo sequence */
|
|
#endif
|
|
if (get_undolevel() < 0)
|
|
curbuf->b_u_synced = TRUE; /* no entries, nothing to do */
|
|
else
|
|
{
|
|
u_getbot(); /* compute ue_bot of previous u_save */
|
|
curbuf->b_u_curhead = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ":undolist": List the leafs of the undo tree
|
|
*/
|
|
void
|
|
ex_undolist(exarg_T *eap UNUSED)
|
|
{
|
|
garray_T ga;
|
|
u_header_T *uhp;
|
|
int mark;
|
|
int nomark;
|
|
int changes = 1;
|
|
int i;
|
|
|
|
/*
|
|
* 1: walk the tree to find all leafs, put the info in "ga".
|
|
* 2: sort the lines
|
|
* 3: display the list
|
|
*/
|
|
mark = ++lastmark;
|
|
nomark = ++lastmark;
|
|
ga_init2(&ga, (int)sizeof(char *), 20);
|
|
|
|
uhp = curbuf->b_u_oldhead;
|
|
while (uhp != NULL)
|
|
{
|
|
if (uhp->uh_prev.ptr == NULL && uhp->uh_walk != nomark
|
|
&& uhp->uh_walk != mark)
|
|
{
|
|
if (ga_grow(&ga, 1) == FAIL)
|
|
break;
|
|
vim_snprintf((char *)IObuff, IOSIZE, "%6ld %7d ",
|
|
uhp->uh_seq, changes);
|
|
u_add_time(IObuff + STRLEN(IObuff), IOSIZE - STRLEN(IObuff),
|
|
uhp->uh_time);
|
|
if (uhp->uh_save_nr > 0)
|
|
{
|
|
while (STRLEN(IObuff) < 33)
|
|
STRCAT(IObuff, " ");
|
|
vim_snprintf_add((char *)IObuff, IOSIZE,
|
|
" %3ld", uhp->uh_save_nr);
|
|
}
|
|
((char_u **)(ga.ga_data))[ga.ga_len++] = vim_strsave(IObuff);
|
|
}
|
|
|
|
uhp->uh_walk = mark;
|
|
|
|
/* go down in the tree if we haven't been there */
|
|
if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark
|
|
&& uhp->uh_prev.ptr->uh_walk != mark)
|
|
{
|
|
uhp = uhp->uh_prev.ptr;
|
|
++changes;
|
|
}
|
|
|
|
/* go to alternate branch if we haven't been there */
|
|
else if (uhp->uh_alt_next.ptr != NULL
|
|
&& uhp->uh_alt_next.ptr->uh_walk != nomark
|
|
&& uhp->uh_alt_next.ptr->uh_walk != mark)
|
|
uhp = uhp->uh_alt_next.ptr;
|
|
|
|
/* go up in the tree if we haven't been there and we are at the
|
|
* start of alternate branches */
|
|
else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL
|
|
&& uhp->uh_next.ptr->uh_walk != nomark
|
|
&& uhp->uh_next.ptr->uh_walk != mark)
|
|
{
|
|
uhp = uhp->uh_next.ptr;
|
|
--changes;
|
|
}
|
|
|
|
else
|
|
{
|
|
/* need to backtrack; mark this node as done */
|
|
uhp->uh_walk = nomark;
|
|
if (uhp->uh_alt_prev.ptr != NULL)
|
|
uhp = uhp->uh_alt_prev.ptr;
|
|
else
|
|
{
|
|
uhp = uhp->uh_next.ptr;
|
|
--changes;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ga.ga_len == 0)
|
|
MSG(_("Nothing to undo"));
|
|
else
|
|
{
|
|
sort_strings((char_u **)ga.ga_data, ga.ga_len);
|
|
|
|
msg_start();
|
|
msg_puts_attr((char_u *)_("number changes when saved"),
|
|
HL_ATTR(HLF_T));
|
|
for (i = 0; i < ga.ga_len && !got_int; ++i)
|
|
{
|
|
msg_putchar('\n');
|
|
if (got_int)
|
|
break;
|
|
msg_puts(((char_u **)ga.ga_data)[i]);
|
|
}
|
|
msg_end();
|
|
|
|
ga_clear_strings(&ga);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Put the timestamp of an undo header in "buf[buflen]" in a nice format.
|
|
*/
|
|
static void
|
|
u_add_time(char_u *buf, size_t buflen, time_t tt)
|
|
{
|
|
#ifdef HAVE_STRFTIME
|
|
struct tm *curtime;
|
|
|
|
if (vim_time() - tt >= 100)
|
|
{
|
|
curtime = localtime(&tt);
|
|
if (vim_time() - tt < (60L * 60L * 12L))
|
|
/* within 12 hours */
|
|
(void)strftime((char *)buf, buflen, "%H:%M:%S", curtime);
|
|
else
|
|
/* longer ago */
|
|
(void)strftime((char *)buf, buflen, "%Y/%m/%d %H:%M:%S", curtime);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
long seconds = (long)(vim_time() - tt);
|
|
|
|
vim_snprintf((char *)buf, buflen,
|
|
NGETTEXT("%ld second ago", "%ld seconds ago", seconds),
|
|
seconds);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ":undojoin": continue adding to the last entry list
|
|
*/
|
|
void
|
|
ex_undojoin(exarg_T *eap UNUSED)
|
|
{
|
|
if (curbuf->b_u_newhead == NULL)
|
|
return; /* nothing changed before */
|
|
if (curbuf->b_u_curhead != NULL)
|
|
{
|
|
EMSG(_("E790: undojoin is not allowed after undo"));
|
|
return;
|
|
}
|
|
if (!curbuf->b_u_synced)
|
|
return; /* already unsynced */
|
|
if (get_undolevel() < 0)
|
|
return; /* no entries, nothing to do */
|
|
else
|
|
/* Append next change to the last entry */
|
|
curbuf->b_u_synced = FALSE;
|
|
}
|
|
|
|
/*
|
|
* Called after writing or reloading the file and setting b_changed to FALSE.
|
|
* Now an undo means that the buffer is modified.
|
|
*/
|
|
void
|
|
u_unchanged(buf_T *buf)
|
|
{
|
|
u_unch_branch(buf->b_u_oldhead);
|
|
buf->b_did_warn = FALSE;
|
|
}
|
|
|
|
/*
|
|
* After reloading a buffer which was saved for 'undoreload': Find the first
|
|
* line that was changed and set the cursor there.
|
|
*/
|
|
void
|
|
u_find_first_changed(void)
|
|
{
|
|
u_header_T *uhp = curbuf->b_u_newhead;
|
|
u_entry_T *uep;
|
|
linenr_T lnum;
|
|
|
|
if (curbuf->b_u_curhead != NULL || uhp == NULL)
|
|
return; /* undid something in an autocmd? */
|
|
|
|
/* Check that the last undo block was for the whole file. */
|
|
uep = uhp->uh_entry;
|
|
if (uep->ue_top != 0 || uep->ue_bot != 0)
|
|
return;
|
|
|
|
for (lnum = 1; lnum < curbuf->b_ml.ml_line_count
|
|
&& lnum <= uep->ue_size; ++lnum)
|
|
if (STRCMP(ml_get_buf(curbuf, lnum, FALSE),
|
|
uep->ue_array[lnum - 1]) != 0)
|
|
{
|
|
CLEAR_POS(&(uhp->uh_cursor));
|
|
uhp->uh_cursor.lnum = lnum;
|
|
return;
|
|
}
|
|
if (curbuf->b_ml.ml_line_count != uep->ue_size)
|
|
{
|
|
/* lines added or deleted at the end, put the cursor there */
|
|
CLEAR_POS(&(uhp->uh_cursor));
|
|
uhp->uh_cursor.lnum = lnum;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Increase the write count, store it in the last undo header, what would be
|
|
* used for "u".
|
|
*/
|
|
void
|
|
u_update_save_nr(buf_T *buf)
|
|
{
|
|
u_header_T *uhp;
|
|
|
|
++buf->b_u_save_nr_last;
|
|
buf->b_u_save_nr_cur = buf->b_u_save_nr_last;
|
|
uhp = buf->b_u_curhead;
|
|
if (uhp != NULL)
|
|
uhp = uhp->uh_next.ptr;
|
|
else
|
|
uhp = buf->b_u_newhead;
|
|
if (uhp != NULL)
|
|
uhp->uh_save_nr = buf->b_u_save_nr_last;
|
|
}
|
|
|
|
static void
|
|
u_unch_branch(u_header_T *uhp)
|
|
{
|
|
u_header_T *uh;
|
|
|
|
for (uh = uhp; uh != NULL; uh = uh->uh_prev.ptr)
|
|
{
|
|
uh->uh_flags |= UH_CHANGED;
|
|
if (uh->uh_alt_next.ptr != NULL)
|
|
u_unch_branch(uh->uh_alt_next.ptr); /* recursive */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get pointer to last added entry.
|
|
* If it's not valid, give an error message and return NULL.
|
|
*/
|
|
static u_entry_T *
|
|
u_get_headentry(void)
|
|
{
|
|
if (curbuf->b_u_newhead == NULL || curbuf->b_u_newhead->uh_entry == NULL)
|
|
{
|
|
IEMSG(_("E439: undo list corrupt"));
|
|
return NULL;
|
|
}
|
|
return curbuf->b_u_newhead->uh_entry;
|
|
}
|
|
|
|
/*
|
|
* u_getbot(): compute the line number of the previous u_save
|
|
* It is called only when b_u_synced is FALSE.
|
|
*/
|
|
static void
|
|
u_getbot(void)
|
|
{
|
|
u_entry_T *uep;
|
|
linenr_T extra;
|
|
|
|
uep = u_get_headentry(); /* check for corrupt undo list */
|
|
if (uep == NULL)
|
|
return;
|
|
|
|
uep = curbuf->b_u_newhead->uh_getbot_entry;
|
|
if (uep != NULL)
|
|
{
|
|
/*
|
|
* the new ue_bot is computed from the number of lines that has been
|
|
* inserted (0 - deleted) since calling u_save. This is equal to the
|
|
* old line count subtracted from the current line count.
|
|
*/
|
|
extra = curbuf->b_ml.ml_line_count - uep->ue_lcount;
|
|
uep->ue_bot = uep->ue_top + uep->ue_size + 1 + extra;
|
|
if (uep->ue_bot < 1 || uep->ue_bot > curbuf->b_ml.ml_line_count)
|
|
{
|
|
IEMSG(_("E440: undo line missing"));
|
|
uep->ue_bot = uep->ue_top + 1; /* assume all lines deleted, will
|
|
* get all the old lines back
|
|
* without deleting the current
|
|
* ones */
|
|
}
|
|
|
|
curbuf->b_u_newhead->uh_getbot_entry = NULL;
|
|
}
|
|
|
|
curbuf->b_u_synced = TRUE;
|
|
}
|
|
|
|
/*
|
|
* Free one header "uhp" and its entry list and adjust the pointers.
|
|
*/
|
|
static void
|
|
u_freeheader(
|
|
buf_T *buf,
|
|
u_header_T *uhp,
|
|
u_header_T **uhpp) /* if not NULL reset when freeing this header */
|
|
{
|
|
u_header_T *uhap;
|
|
|
|
/* When there is an alternate redo list free that branch completely,
|
|
* because we can never go there. */
|
|
if (uhp->uh_alt_next.ptr != NULL)
|
|
u_freebranch(buf, uhp->uh_alt_next.ptr, uhpp);
|
|
|
|
if (uhp->uh_alt_prev.ptr != NULL)
|
|
uhp->uh_alt_prev.ptr->uh_alt_next.ptr = NULL;
|
|
|
|
/* Update the links in the list to remove the header. */
|
|
if (uhp->uh_next.ptr == NULL)
|
|
buf->b_u_oldhead = uhp->uh_prev.ptr;
|
|
else
|
|
uhp->uh_next.ptr->uh_prev.ptr = uhp->uh_prev.ptr;
|
|
|
|
if (uhp->uh_prev.ptr == NULL)
|
|
buf->b_u_newhead = uhp->uh_next.ptr;
|
|
else
|
|
for (uhap = uhp->uh_prev.ptr; uhap != NULL;
|
|
uhap = uhap->uh_alt_next.ptr)
|
|
uhap->uh_next.ptr = uhp->uh_next.ptr;
|
|
|
|
u_freeentries(buf, uhp, uhpp);
|
|
}
|
|
|
|
/*
|
|
* Free an alternate branch and any following alternate branches.
|
|
*/
|
|
static void
|
|
u_freebranch(
|
|
buf_T *buf,
|
|
u_header_T *uhp,
|
|
u_header_T **uhpp) /* if not NULL reset when freeing this header */
|
|
{
|
|
u_header_T *tofree, *next;
|
|
|
|
/* If this is the top branch we may need to use u_freeheader() to update
|
|
* all the pointers. */
|
|
if (uhp == buf->b_u_oldhead)
|
|
{
|
|
while (buf->b_u_oldhead != NULL)
|
|
u_freeheader(buf, buf->b_u_oldhead, uhpp);
|
|
return;
|
|
}
|
|
|
|
if (uhp->uh_alt_prev.ptr != NULL)
|
|
uhp->uh_alt_prev.ptr->uh_alt_next.ptr = NULL;
|
|
|
|
next = uhp;
|
|
while (next != NULL)
|
|
{
|
|
tofree = next;
|
|
if (tofree->uh_alt_next.ptr != NULL)
|
|
u_freebranch(buf, tofree->uh_alt_next.ptr, uhpp); /* recursive */
|
|
next = tofree->uh_prev.ptr;
|
|
u_freeentries(buf, tofree, uhpp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free all the undo entries for one header and the header itself.
|
|
* This means that "uhp" is invalid when returning.
|
|
*/
|
|
static void
|
|
u_freeentries(
|
|
buf_T *buf,
|
|
u_header_T *uhp,
|
|
u_header_T **uhpp) /* if not NULL reset when freeing this header */
|
|
{
|
|
u_entry_T *uep, *nuep;
|
|
|
|
/* Check for pointers to the header that become invalid now. */
|
|
if (buf->b_u_curhead == uhp)
|
|
buf->b_u_curhead = NULL;
|
|
if (buf->b_u_newhead == uhp)
|
|
buf->b_u_newhead = NULL; /* freeing the newest entry */
|
|
if (uhpp != NULL && uhp == *uhpp)
|
|
*uhpp = NULL;
|
|
|
|
for (uep = uhp->uh_entry; uep != NULL; uep = nuep)
|
|
{
|
|
nuep = uep->ue_next;
|
|
u_freeentry(uep, uep->ue_size);
|
|
}
|
|
|
|
#ifdef U_DEBUG
|
|
uhp->uh_magic = 0;
|
|
#endif
|
|
vim_free((char_u *)uhp);
|
|
--buf->b_u_numhead;
|
|
}
|
|
|
|
/*
|
|
* free entry 'uep' and 'n' lines in uep->ue_array[]
|
|
*/
|
|
static void
|
|
u_freeentry(u_entry_T *uep, long n)
|
|
{
|
|
while (n > 0)
|
|
vim_free(uep->ue_array[--n]);
|
|
vim_free((char_u *)uep->ue_array);
|
|
#ifdef U_DEBUG
|
|
uep->ue_magic = 0;
|
|
#endif
|
|
vim_free((char_u *)uep);
|
|
}
|
|
|
|
/*
|
|
* invalidate the undo buffer; called when storage has already been released
|
|
*/
|
|
void
|
|
u_clearall(buf_T *buf)
|
|
{
|
|
buf->b_u_newhead = buf->b_u_oldhead = buf->b_u_curhead = NULL;
|
|
buf->b_u_synced = TRUE;
|
|
buf->b_u_numhead = 0;
|
|
buf->b_u_line_ptr = NULL;
|
|
buf->b_u_line_lnum = 0;
|
|
}
|
|
|
|
/*
|
|
* save the line "lnum" for the "U" command
|
|
*/
|
|
void
|
|
u_saveline(linenr_T lnum)
|
|
{
|
|
if (lnum == curbuf->b_u_line_lnum) /* line is already saved */
|
|
return;
|
|
if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count) /* should never happen */
|
|
return;
|
|
u_clearline();
|
|
curbuf->b_u_line_lnum = lnum;
|
|
if (curwin->w_cursor.lnum == lnum)
|
|
curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
else
|
|
curbuf->b_u_line_colnr = 0;
|
|
if ((curbuf->b_u_line_ptr = u_save_line(lnum)) == NULL)
|
|
do_outofmem_msg((long_u)0);
|
|
}
|
|
|
|
/*
|
|
* clear the line saved for the "U" command
|
|
* (this is used externally for crossing a line while in insert mode)
|
|
*/
|
|
void
|
|
u_clearline(void)
|
|
{
|
|
if (curbuf->b_u_line_ptr != NULL)
|
|
{
|
|
VIM_CLEAR(curbuf->b_u_line_ptr);
|
|
curbuf->b_u_line_lnum = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Implementation of the "U" command.
|
|
* Differentiation from vi: "U" can be undone with the next "U".
|
|
* We also allow the cursor to be in another line.
|
|
* Careful: may trigger autocommands that reload the buffer.
|
|
*/
|
|
void
|
|
u_undoline(void)
|
|
{
|
|
colnr_T t;
|
|
char_u *oldp;
|
|
|
|
if (undo_off)
|
|
return;
|
|
|
|
if (curbuf->b_u_line_ptr == NULL
|
|
|| curbuf->b_u_line_lnum > curbuf->b_ml.ml_line_count)
|
|
{
|
|
beep_flush();
|
|
return;
|
|
}
|
|
|
|
/* first save the line for the 'u' command */
|
|
if (u_savecommon(curbuf->b_u_line_lnum - 1,
|
|
curbuf->b_u_line_lnum + 1, (linenr_T)0, FALSE) == FAIL)
|
|
return;
|
|
oldp = u_save_line(curbuf->b_u_line_lnum);
|
|
if (oldp == NULL)
|
|
{
|
|
do_outofmem_msg((long_u)0);
|
|
return;
|
|
}
|
|
ml_replace(curbuf->b_u_line_lnum, curbuf->b_u_line_ptr, TRUE);
|
|
changed_bytes(curbuf->b_u_line_lnum, 0);
|
|
vim_free(curbuf->b_u_line_ptr);
|
|
curbuf->b_u_line_ptr = oldp;
|
|
|
|
t = curbuf->b_u_line_colnr;
|
|
if (curwin->w_cursor.lnum == curbuf->b_u_line_lnum)
|
|
curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
curwin->w_cursor.col = t;
|
|
curwin->w_cursor.lnum = curbuf->b_u_line_lnum;
|
|
check_cursor_col();
|
|
}
|
|
|
|
/*
|
|
* Free all allocated memory blocks for the buffer 'buf'.
|
|
*/
|
|
void
|
|
u_blockfree(buf_T *buf)
|
|
{
|
|
while (buf->b_u_oldhead != NULL)
|
|
u_freeheader(buf, buf->b_u_oldhead, NULL);
|
|
vim_free(buf->b_u_line_ptr);
|
|
}
|
|
|
|
/*
|
|
* u_save_line(): allocate memory and copy line 'lnum' into it.
|
|
* Returns NULL when out of memory.
|
|
*/
|
|
static char_u *
|
|
u_save_line(linenr_T lnum)
|
|
{
|
|
return vim_strsave(ml_get(lnum));
|
|
}
|
|
|
|
/*
|
|
* Check if the 'modified' flag is set, or 'ff' has changed (only need to
|
|
* check the first character, because it can only be "dos", "unix" or "mac").
|
|
* "nofile" and "scratch" type buffers are considered to always be unchanged.
|
|
* Also considers a buffer changed when a terminal window contains a running
|
|
* job.
|
|
*/
|
|
int
|
|
bufIsChanged(buf_T *buf)
|
|
{
|
|
#ifdef FEAT_TERMINAL
|
|
if (term_job_running(buf->b_term))
|
|
return TRUE;
|
|
#endif
|
|
return bufIsChangedNotTerm(buf);
|
|
}
|
|
|
|
/*
|
|
* Like bufIsChanged() but ignoring a terminal window.
|
|
*/
|
|
int
|
|
bufIsChangedNotTerm(buf_T *buf)
|
|
{
|
|
// In a "prompt" buffer we do respect 'modified', so that we can control
|
|
// closing the window by setting or resetting that option.
|
|
return (!bt_dontwrite(buf) || bt_prompt(buf))
|
|
&& (buf->b_changed || file_ff_differs(buf, TRUE));
|
|
}
|
|
|
|
int
|
|
curbufIsChanged(void)
|
|
{
|
|
return bufIsChanged(curbuf);
|
|
}
|
|
|
|
#if defined(FEAT_EVAL) || defined(PROTO)
|
|
/*
|
|
* For undotree(): Append the list of undo blocks at "first_uhp" to "list".
|
|
* Recursive.
|
|
*/
|
|
void
|
|
u_eval_tree(u_header_T *first_uhp, list_T *list)
|
|
{
|
|
u_header_T *uhp = first_uhp;
|
|
dict_T *dict;
|
|
|
|
while (uhp != NULL)
|
|
{
|
|
dict = dict_alloc();
|
|
if (dict == NULL)
|
|
return;
|
|
dict_add_number(dict, "seq", uhp->uh_seq);
|
|
dict_add_number(dict, "time", (long)uhp->uh_time);
|
|
if (uhp == curbuf->b_u_newhead)
|
|
dict_add_number(dict, "newhead", 1);
|
|
if (uhp == curbuf->b_u_curhead)
|
|
dict_add_number(dict, "curhead", 1);
|
|
if (uhp->uh_save_nr > 0)
|
|
dict_add_number(dict, "save", uhp->uh_save_nr);
|
|
|
|
if (uhp->uh_alt_next.ptr != NULL)
|
|
{
|
|
list_T *alt_list = list_alloc();
|
|
|
|
if (alt_list != NULL)
|
|
{
|
|
/* Recursive call to add alternate undo tree. */
|
|
u_eval_tree(uhp->uh_alt_next.ptr, alt_list);
|
|
dict_add_list(dict, "alt", alt_list);
|
|
}
|
|
}
|
|
|
|
list_append_dict(list, dict);
|
|
uhp = uhp->uh_prev.ptr;
|
|
}
|
|
}
|
|
#endif
|