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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154/****mbtowc.c - Convert multibyte char to wide char.** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Convert a multibyte character into the equivalent wide character.********************************************************************************/#include <corecrt_internal_mbstring.h>#include <corecrt_internal_ptd_propagation.h>#include <locale.h>#include <stdlib.h>#include <wchar.h>
using namespace __crt_mbstring;
/****int mbtowc() - Convert multibyte char to wide character.**Purpose:* Convert a multi-byte character into the equivalent wide character,* according to the LC_CTYPE category of the current locale.* [ANSI].** NOTE: Currently, the C libraries support the "C" locale only.* Non-C locale support now available under _INTL switch.*Entry:* wchar_t *pwc = pointer to destination wide character* const char *s = pointer to multibyte character* size_t n = maximum length of multibyte character to consider**Exit:* If s = nullptr, returns 0, indicating we only use state-independent* character encodings.* If s != nullptr, returns: 0 (if *s = null char)* -1 (if the next n or fewer bytes not valid mbc)* number of bytes comprising converted mbc**Exceptions:* If errors are encountered, -1 is returned and errno is set to EILSEQ.********************************************************************************/
extern "C" int __cdecl _mbtowc_internal( wchar_t * pwc, const char * s, size_t n, __crt_cached_ptd_host& ptd ){ static mbstate_t internal_state{}; if (!s || n == 0) { /* indicate do not have state-dependent encodings, handle zero length string */ internal_state = {}; return 0; }
if (!*s) { /* handle NULL char */ if (pwc) { *pwc = 0; } return 0; }
const _locale_t locale = ptd.get_locale();
if (locale->locinfo->_public._locale_lc_codepage == CP_UTF8) { int result = static_cast<int>(__mbrtowc_utf8(pwc, s, n, &internal_state, ptd)); if (result < 0) result = -1; return result; }
_ASSERTE(locale->locinfo->_public._locale_mb_cur_max == 1 || locale->locinfo->_public._locale_mb_cur_max == 2);
if (locale->locinfo->locale_name[LC_CTYPE] == nullptr) { if (pwc) { *pwc = (wchar_t) (unsigned char) *s; } return sizeof(char); }
if (_isleadbyte_fast_internal((unsigned char) *s, locale)) { _ASSERTE(locale->locinfo->_public._locale_lc_codepage != CP_UTF8 && L"UTF-8 isn't supported in this _mbtowc_l function yet!!!");
/* multi-byte char */ // If this is a lead byte, then the codepage better be a multibyte codepage _ASSERTE(locale->locinfo->_public._locale_mb_cur_max > 1);
if ((locale->locinfo->_public._locale_mb_cur_max <= 1) || ((int) n < locale->locinfo->_public._locale_mb_cur_max) || (__acrt_MultiByteToWideChar(locale->locinfo->_public._locale_lc_codepage, MB_PRECOMPOSED | MB_ERR_INVALID_CHARS, s, locale->locinfo->_public._locale_mb_cur_max, pwc, (pwc) ? 1 : 0) == 0)) { /* validate high byte of mbcs char */ if ((n < (size_t) locale->locinfo->_public._locale_mb_cur_max) || (!*(s + 1))) { ptd.get_errno().set(EILSEQ); return -1; } } return locale->locinfo->_public._locale_mb_cur_max; } else { /* single byte char */ if (__acrt_MultiByteToWideChar(locale->locinfo->_public._locale_lc_codepage, MB_PRECOMPOSED | MB_ERR_INVALID_CHARS, s, 1, pwc, (pwc) ? 1 : 0) == 0) { ptd.get_errno().set(EILSEQ); return -1; } return sizeof(char); }}
extern "C" int __cdecl _mbtowc_l( wchar_t *pwc, const char *s, size_t n, _locale_t plocinfo ){ __crt_cached_ptd_host ptd(plocinfo); return _mbtowc_internal(pwc, s, n, ptd);}
extern "C" int __cdecl mbtowc( wchar_t *pwc, const char *s, size_t n ){ __crt_cached_ptd_host ptd; return _mbtowc_internal(pwc, s, n, ptd);}