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patch 8.0.0551: the typeahead buffer is reallocated too often

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Problem:    The typeahead buffer is reallocated too often.
Solution:   Re-use the existing buffer if possible.
This commit is contained in:
Bram Moolenaar
2017-04-08 18:41:13 +02:00
parent 9585a1655b
commit d34f9b1155
2 changed files with 15 additions and 3 deletions
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16
src/getchar.c
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@@ -920,7 +920,7 @@ init_typebuf(void)
typebuf.tb_noremap = noremapbuf_init;
typebuf.tb_buflen = TYPELEN_INIT;
typebuf.tb_len = 0;
typebuf.tb_off = 0;
typebuf.tb_off = MAXMAPLEN + 4;
typebuf.tb_change_cnt = 1;
}
}
@@ -974,11 +974,21 @@ ins_typebuf(
typebuf.tb_off -= addlen;
mch_memmove(typebuf.tb_buf + typebuf.tb_off, str, (size_t)addlen);
}
else if (typebuf.tb_len == 0 && typebuf.tb_buflen
>= addlen + 3 * (MAXMAPLEN + 4))
{
/*
* Buffer is empty and string fits in the existing buffer.
* Leave some space before and after, if possible.
*/
typebuf.tb_off = (typebuf.tb_buflen - addlen - 3 * (MAXMAPLEN + 4)) / 2;
mch_memmove(typebuf.tb_buf + typebuf.tb_off, str, (size_t)addlen);
}
else
{
/*
* Need to allocate a new buffer.
* In typebuf.tb_buf there must always be room for 3 * MAXMAPLEN + 4
* In typebuf.tb_buf there must always be room for 3 * (MAXMAPLEN + 4)
* characters. We add some extra room to avoid having to allocate too
* often.
*/
@@ -1291,7 +1301,7 @@ alloc_typebuf(void)
return FAIL;
}
typebuf.tb_buflen = TYPELEN_INIT;
typebuf.tb_off = 0;
typebuf.tb_off = MAXMAPLEN + 4; /* can insert without realloc */
typebuf.tb_len = 0;
typebuf.tb_maplen = 0;
typebuf.tb_silent = 0;