Jeremy Soller
59 lines
1.4 KiB
Rust
59 lines
1.4 KiB
Rust
//UTF implementation parts for wchar.h.
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//Partially ported from the Sortix libc
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use core::{char, slice, str, usize};
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use header::errno;
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use platform;
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use platform::types::*;
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use mbstate_t;
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//It's guaranteed that we don't have any nullpointers here
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pub unsafe fn mbrtowc(pwc: *mut wchar_t, s: *const c_char, n: usize, ps: *mut mbstate_t) -> usize {
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let mut size = str::utf8_char_width(*s as u8);
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if size > n {
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platform::errno = errno::EILSEQ;
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return -2isize as usize;
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}
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if size == 0 {
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platform::errno = errno::EILSEQ;
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return -1isize as usize;
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}
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let slice = slice::from_raw_parts(s as *const u8, size);
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let decoded = str::from_utf8(slice);
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if decoded.is_err() {
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platform::errno = errno::EILSEQ;
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return -1isize as usize;
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}
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let wc = decoded.unwrap();
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let result: wchar_t = wc.chars().next().unwrap() as wchar_t;
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if !pwc.is_null() {
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*pwc = result;
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}
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return if result != 0 { size } else { 0 };
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}
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//It's guaranteed that we don't have any nullpointers here
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pub unsafe fn wcrtomb(s: *mut c_char, wc: wchar_t, ps: *mut mbstate_t) -> usize {
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let dc = char::from_u32(wc as u32);
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if dc.is_none() {
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platform::errno = errno::EILSEQ;
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return -1isize as usize;
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}
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let c = dc.unwrap();
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let size = c.len_utf8();
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let mut slice = slice::from_raw_parts_mut(s as *mut u8, size);
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c.encode_utf8(slice);
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size
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}
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