forked from vitrine/wmaker
108 lines
3.2 KiB
Rust
108 lines
3.2 KiB
Rust
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use std::{
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os::raw::{c_char, c_int},
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sync::RwLock,
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};
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static ERROR_STATUS: RwLock<ErrorCode> = RwLock::new(ErrorCode::None);
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#[repr(i16)]
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#[derive(Debug, Clone, Copy)]
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pub enum ErrorCode {
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/// No known error status.
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None = 0,
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/// Can't open file.
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Open = 1,
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/// Error reading from file.
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Read = 2,
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/// Error writing to file.
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Write = 3,
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/// Out of memory.
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NoMemory = 4,
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/// Out of color cells.
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NoColor = 5,
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/// Image file is corrupted or invalid.
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BadImageFile = 6,
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/// Image file format is unknown.
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BadFormat = 7,
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/// No such image index in file.
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BadIndex = 8,
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/// Invalid visual ID requested for context.
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BadVisualId = 16,
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/// Failed to create std colormap.
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StdCmapFail = 17,
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/// Internal X11 error.
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XError = 127,
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/// Should not happen.
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Internal = 128,
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}
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/// Sets the global error status in a thread-safe way. Panics if the error
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/// status lock has been poisoned.
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pub fn wraster_set_error_code(code: ErrorCode) {
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*ERROR_STATUS.write().unwrap() = code;
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}
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/// Sets the global error status to a literal `value`. Panics if `value` does
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/// not correspond to a valid error value.
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#[no_mangle]
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pub unsafe extern "C" fn wraster_report_error_code(value: c_int) {
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let value = match value {
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0 => ErrorCode::None,
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1 => ErrorCode::Open,
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2 => ErrorCode::Read,
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3 => ErrorCode::Write,
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4 => ErrorCode::NoMemory,
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5 => ErrorCode::NoColor,
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6 => ErrorCode::BadImageFile,
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7 => ErrorCode::BadFormat,
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8 => ErrorCode::BadIndex,
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16 => ErrorCode::BadVisualId,
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17 => ErrorCode::StdCmapFail,
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127 => ErrorCode::XError,
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128 => ErrorCode::Internal,
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_ => panic!("unknown error code: {}", value),
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};
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*ERROR_STATUS.write().unwrap() = value;
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}
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/// Returns the current error status. Panics if the error status lock has been
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/// poisoned.
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#[no_mangle]
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pub extern "C" fn wraster_current_error_code() -> i16 {
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*ERROR_STATUS.read().unwrap() as i16
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}
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/// Returns a human-readable description of the current error status. Panics if
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/// the error status lock has been poisoned.
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#[no_mangle]
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pub extern "C" fn wraster_current_error_message() -> *const c_char {
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// TODO: i18n of these messages.
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match *ERROR_STATUS.read().unwrap() {
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ErrorCode::None => c"no error".as_ptr(),
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ErrorCode::Open => c"could not open file".as_ptr(),
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ErrorCode::Read => c"error reading from file".as_ptr(),
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ErrorCode::Write => c"error writing to file".as_ptr(),
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ErrorCode::NoMemory => c"out of memory".as_ptr(),
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ErrorCode::NoColor => c"out of color cells".as_ptr(),
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ErrorCode::BadImageFile => c"invalid or corrupted image file".as_ptr(),
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ErrorCode::BadFormat => c"image format is not supported".as_ptr(),
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ErrorCode::BadIndex => c"file does not contain requested image index".as_ptr(),
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ErrorCode::BadVisualId => c"request for an invalid Visual ID".as_ptr(),
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ErrorCode::StdCmapFail => c"failed to create X standard colormap".as_ptr(),
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ErrorCode::XError => c"internal X error".as_ptr(),
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ErrorCode::Internal => c"internal error".as_ptr(),
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}
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}
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