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Perform conversions straight from the stream buffer instead of scanning

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through byte by byte with mbrtowc(). In the usual case (buffer is big
enough to contain the multibyte character, character does not straddle
buffer boundary) this results in only one call to mbrtowc() for each
wide character read.
This commit is contained in:
tjr 2004-05-22 15:41:03 +00:00
parent f5a461b270
commit ac834a03f9
1 changed files with 19 additions and 18 deletions
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37
lib/libc/stdio/fgetwc.c
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@ -77,30 +77,31 @@ fgetwc(FILE *fp)
static __inline wint_t
__fgetwc_nbf(FILE *fp)
{
size_t n, nconv;
int c;
char cc;
wchar_t wc;
size_t nconv;
n = 0;
for (;;) {
if ((c = __sgetc(fp)) == EOF) {
if (n == 0)
return (WEOF);
if (fp->_r <= 0 && __srefill(fp))
return (WEOF);
do {
nconv = mbrtowc(&wc, fp->_p, fp->_r, &fp->_extra->mbstate);
if (nconv == (size_t)-1)
break;
}
n++;
cc = (char)c;
nconv = mbrtowc(&wc, &cc, 1, &fp->_extra->mbstate);
if (nconv == (size_t)-2)
else if (nconv == (size_t)-2)
continue;
else if (nconv == (size_t)-1)
break;
else if (nconv == 0)
else if (nconv == 0) {
/*
* Assume that the only valid representation of
* the null wide character is a single null byte.
*/
fp->_p++;
fp->_r--;
return (L'\0');
else
} else {
fp->_p += nconv;
fp->_r -= nconv;
return (wc);
}
}
} while (__srefill(fp) == 0);
fp->_flags |= __SERR;
errno = EILSEQ;
return (WEOF);