384 lines
9.7 KiB
C
384 lines
9.7 KiB
C
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/***
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*xmbtowc.c - Convert multibyte char to wide char.
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*
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* Copyright (c) 1995-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Convert a multibyte character into the equivalent wide character.
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*
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*Revision History:
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* 12-XX-95 PJP Created from mbtowc.c December 1995 by P.J. Plauger
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* 04-17-96 GJF Updated for current locale locking. Also, reformatted
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* and made several cosmetic changes.
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* 09-25-96 GJF Made mbrlen, mbrtowc and mbsrtowcs multithread safe.
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* 09-17-97 JWM Added "return MB_CUR_MAX" to "if (*pst != 0)" branch.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdlib.h>
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#include <mtdll.h>
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#include <errno.h>
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#include <dbgint.h>
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#include <ctype.h>
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#include <limits.h> /* for INT_MAX */
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#include <stdio.h> /* for EOF */
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#include <xlocinfo.h> /* for _Cvtvec, _Mbrtowc */
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#ifdef _WIN32
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#include <internal.h>
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#include <locale.h>
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#include <setlocal.h>
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#endif /* _WIN32 */
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#ifndef _MT
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#define _Mbrtowc_lk _Mbrtowc
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#endif
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/***
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*int _Mbrtowc() - Convert multibyte char to wide character.
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*
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*Purpose:
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* Convert a multi-byte character into the equivalent wide character,
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* according to the specified LC_CTYPE category, or the current locale.
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* [ANSI].
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*
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* NOTE: Currently, the C libraries support the "C" locale only.
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* Non-C locale support now available under _INTL switch.
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*Entry:
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* wchar_t *pwc = pointer to destination wide character
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* const char *s = pointer to multibyte character
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* size_t n = maximum length of multibyte character to consider
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* mbstate_t *pst = pointer to state
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* const _Cvtvec * = pointer to locale info
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*
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*Exit:
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* If s = NULL, returns 0, indicating we only use state-independent
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* character encodings.
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* If s != NULL, returns: 0 (if *s = null char)
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* -1 (if the next n or fewer bytes not valid mbc)
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* number of bytes comprising converted mbc
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifdef _MT
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static int __cdecl _Mbrtowc_lk
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(
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wchar_t *pwc,
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const char *s,
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size_t n,
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mbstate_t *pst,
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const _Cvtvec *ploc
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);
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int _CRTIMP2 __cdecl _Mbrtowc(
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wchar_t *pwc,
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const char *s,
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size_t n,
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mbstate_t *pst,
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const _Cvtvec *ploc
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)
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{
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int retval;
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#ifdef _MT
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int local_lock_flag;
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#endif
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_lock_locale( local_lock_flag )
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retval = _Mbrtowc_lk(pwc, s, n, pst, ploc);
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_unlock_locale( local_lock_flag )
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return retval;
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}
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#endif /* _MT */
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#ifdef _MT
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static int __cdecl _Mbrtowc_lk
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#else /* _MT */
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int _CRTIMP2 __cdecl _Mbrtowc
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#endif /* _MT */
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(
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wchar_t *pwc,
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const char *s,
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size_t n,
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mbstate_t *pst,
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const _Cvtvec *ploc
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)
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{
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_ASSERTE (MB_CUR_MAX == 1 || MB_CUR_MAX == 2);
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if ( !s || n == 0 )
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/* indicate do not have state-dependent encodings,
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handle zero length string */
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return 0;
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if ( !*s )
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{
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/* handle NULL char */
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if (pwc)
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*pwc = 0;
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return 0;
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}
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#ifdef _WIN32
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{ /* perform locale-dependent parse */
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LCID handle;
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UINT codepage;
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if (ploc == 0)
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{
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handle = __lc_handle[LC_CTYPE];
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codepage = __lc_codepage;
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}
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else
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{
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handle = ploc->_Hand;
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codepage = ploc->_Page;
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}
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if ( handle == _CLOCALEHANDLE )
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{
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if (pwc)
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*pwc = (wchar_t)(unsigned char)*s;
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return sizeof(char);
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}
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if (*pst != 0)
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{ /* complete two-byte multibyte character */
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((char *)pst)[1] = *s;
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if (MB_CUR_MAX <= 1 || (MultiByteToWideChar(codepage,
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MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
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(char *)pst, 2, pwc, (pwc) ? 1 : 0) == 0))
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{ /* translation failed */
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*pst = 0;
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errno = EILSEQ;
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return -1;
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}
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*pst = 0;
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return MB_CUR_MAX;
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}
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else if ( isleadbyte((unsigned char)*s) )
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{
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/* multi-byte char */
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if (n < MB_CUR_MAX)
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{ /* save partial multibyte character */
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((char *)pst)[0] = *s;
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return (-2);
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}
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else if ( MB_CUR_MAX <= 1 ||
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(MultiByteToWideChar( codepage,
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MB_PRECOMPOSED |
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MB_ERR_INVALID_CHARS,
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s,
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MB_CUR_MAX,
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pwc,
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(pwc) ? 1 : 0) == 0) )
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{
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/* validate high byte of mbcs char */
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if (!*(s+1))
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{
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*pst = 0;
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errno = EILSEQ;
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return -1;
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}
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/* else translation failed with no complaint? [pjp] */
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}
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return MB_CUR_MAX;
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}
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else {
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/* single byte char */
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if ( MultiByteToWideChar( codepage,
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MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
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s,
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1,
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pwc,
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(pwc) ? 1 : 0) == 0 )
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{
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errno = EILSEQ;
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return -1;
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}
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return sizeof(char);
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}
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}
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#else /* _WIN32 */
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/* stuck the "C" locale again */
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if (pwc)
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*pwc = (wchar_t)(unsigned char)*s;
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return sizeof(char);
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#endif /* _WIN32 */
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}
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/***
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*wint_t btowc(c) - translate single byte to wide char
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*
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*Purpose:
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*
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*Entry:
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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wint_t _CRTIMP2 __cdecl btowc (
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int c
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)
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{
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if (c == EOF)
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return (WEOF);
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else
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{ /* convert as one-byte string */
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char ch = (char)c;
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mbstate_t mbst = 0;
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wchar_t wc;
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return (_Mbrtowc(&wc, &ch, 1, &mbst, 0) < 0 ? WEOF : wc);
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}
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}
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/***
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*size_t mbrlen(s, n, pst) - determine next multibyte code, restartably
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*
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*Purpose:
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*
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*Entry:
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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size_t _CRTIMP2 __cdecl mbrlen (
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const char *s,
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size_t n,
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mbstate_t *pst
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)
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{
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#ifdef _MT
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int local_lock_flag;
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#endif
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size_t retval;
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static mbstate_t mbst = {0};
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_lock_locale( local_lock_flag )
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retval = _Mbrtowc_lk(0, s != 0 ? s : 0, n, pst ? pst : &mbst, 0);
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_unlock_locale( local_lock_flag )
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return retval;
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}
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/***
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*size_t mbrtowc(pwc, s, n, pst) - translate multibyte to wchar_t, restartably
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*
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*Purpose:
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*
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*Entry:
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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size_t _CRTIMP2 __cdecl mbrtowc (
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wchar_t *pwc,
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const char *s,
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size_t n,
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mbstate_t *pst
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)
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{
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#ifdef _MT
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int local_lock_flag;
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#endif
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size_t retval;
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static mbstate_t mbst = {0};
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_lock_locale( local_lock_flag )
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retval = (s != 0) ? _Mbrtowc_lk(pwc, s, n, pst ? pst : &mbst, 0)
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: _Mbrtowc_lk(0, "", n, pst ? pst : &mbst, 0);
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_unlock_locale( local_lock_flag )
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return retval;
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}
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/***
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*size_t mbsrtowcs(wcs, ps, n, pst) - translate multibyte string to wide,
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* restartably
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*
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*Purpose:
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*
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*Entry:
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*
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*Exit:
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*
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*Exceptions:
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*
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*******************************************************************************/
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size_t _CRTIMP2 __cdecl mbsrtowcs (
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wchar_t *wcs,
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const char **ps,
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size_t n,
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mbstate_t *pst
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)
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{
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const char *s = *ps;
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int i;
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size_t nwc = 0;
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#ifdef _MT
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int local_lock_flag;
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#endif
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static mbstate_t mbst = {0};
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if (pst == 0)
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pst = &mbst;
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_lock_locale( local_lock_flag )
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if (wcs == 0)
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for (; ; ++nwc, s += i)
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{ /* translate but don't store */
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wchar_t wc;
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if ((i = _Mbrtowc_lk(&wc, s, INT_MAX, pst, 0)) < 0) {
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_unlock_locale( local_lock_flag )
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return ((size_t)-1);
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}
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else if (i == 0) {
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_unlock_locale( local_lock_flag )
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return (nwc);
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}
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}
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for (; 0 < n; ++nwc, s += i, ++wcs, --n)
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{ /* translate and store */
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if ((i = _Mbrtowc_lk(wcs, s, INT_MAX, pst, 0)) < 0)
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{ /* encountered invalid sequence */
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nwc = (size_t)-1;
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break;
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}
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else if (i == 0)
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{ /* encountered terminating null */
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s = 0;
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break;
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}
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}
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*ps = s;
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_unlock_locale( local_lock_flag )
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return (nwc);
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}
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