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Use a simpler, faster buffering scheme for partial characters in mbrtowc().

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This commit is contained in:
Tim J. Robbins 2004-05-14 15:40:47 +00:00
parent e68f2db9a3
commit b666b593eb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=129229
1 changed files with 27 additions and 21 deletions
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48
lib/libc/locale/mskanji.c
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@ -53,8 +53,7 @@ int _MSKanji_mbsinit(const mbstate_t *);
size_t _MSKanji_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
typedef struct {
int count;
u_char bytes[2];
wchar_t ch;
} _MSKanjiState;
int
@ -73,7 +72,7 @@ int
_MSKanji_mbsinit(const mbstate_t *ps)
{
return (ps == NULL || ((const _MSKanjiState *)ps)->count == 0);
return (ps == NULL || ((const _MSKanjiState *)ps)->ch == 0);
}
size_t
@ -82,12 +81,11 @@ _MSKanji_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
{
_MSKanjiState *ms;
wchar_t wc;
int len, ocount;
size_t ncopy;
ms = (_MSKanjiState *)ps;
if (ms->count < 0 || ms->count > sizeof(ms->bytes)) {
if ((ms->ch & ~0xFF) != 0) {
/* Bad conversion state. */
errno = EINVAL;
return ((size_t)-1);
}
@ -98,33 +96,41 @@ _MSKanji_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
pwc = NULL;
}
ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(ms->bytes) - ms->count);
memcpy(ms->bytes + ms->count, s, ncopy);
ocount = ms->count;
ms->count += ncopy;
s = (char *)ms->bytes;
n = ms->count;
if (n == 0)
/* Incomplete multibyte sequence */
return ((size_t)-2);
len = 1;
if (ms->ch != 0) {
if (*s == '\0') {
errno = EILSEQ;
return ((size_t)-1);
}
wc = (ms->ch << 8) | (*s & 0xFF);
if (pwc != NULL)
*pwc = wc;
ms->ch = 0;
return (1);
}
wc = *s++ & 0xff;
if ((wc > 0x80 && wc < 0xa0) || (wc >= 0xe0 && wc < 0xfd)) {
if (n < 2)
if (n < 2) {
/* Incomplete multibyte sequence */
ms->ch = wc;
return ((size_t)-2);
}
if (*s == '\0') {
errno = EILSEQ;
return ((size_t)-1);
}
wc = (wc << 8) | (*s++ & 0xff);
len = 2;
if (pwc != NULL)
*pwc = wc;
return (2);
} else {
if (pwc != NULL)
*pwc = wc;
return (wc == L'\0' ? 0 : 1);
}
if (pwc != NULL)
*pwc = wc;
ms->count = 0;
return (wc == L'\0' ? 0 : len - ocount);
}
size_t
@ -135,7 +141,7 @@ _MSKanji_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
ms = (_MSKanjiState *)ps;
if (ms->count != 0) {
if (ms->ch != 0) {
errno = EINVAL;
return ((size_t)-1);
}