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128 lines
2.9 KiB
128 lines
2.9 KiB
/***
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*mbsspn.c - Search for init substring of chars from control string (MBCS).
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*
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* Copyright (c) 1985-1994, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Search for init substring of chars from control string (MBCS).
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*
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*Revision History:
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* 11-19-92 KRS Ported from 16-bit sources.
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* 10-05-93 GJF Replaced _CRTAPI1 with __cdecl.
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* 04-15-93 CFW Add _MB_CP_LOCK.
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* 05-09-94 CFW Optimize for SBCS.
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* 05-19-94 CFW Enable non-Win32.
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* 09-14-94 SKS Clean up preprocessor commands inside comments
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*
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*******************************************************************************/
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#ifdef _MBCS
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#include <mtdll.h>
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#include <cruntime.h>
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#include <string.h>
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#include <mbdata.h>
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#include <mbctype.h>
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#include <mbstring.h>
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#include <stddef.h>
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#include <tchar.h>
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/***
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*ifndef _RETURN_PTR
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* _mbsspn - Find first string char not in charset (MBCS)
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*else
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* _mbsspnp - Find first string char not in charset, return pointer (MBCS)
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*endif
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*
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*Purpose:
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* Returns maximum leading segment of string consisting solely
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* of characters from charset. Handles MBCS characters correctly.
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*
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*Entry:
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* unsigned char *string = string to search in
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* unsigned char *charset = set of characters to scan over
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*
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*Exit:
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*
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*ifndef _RETURN_PTR
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* Returns index of first char in string not in control.
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* Returns 0, if string begins with a character not in charset.
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*else
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* Returns pointer to first character not in charset.
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* Returns NULL if string consists entirely of characters from charset.
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*endif
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifndef _RETURN_PTR
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size_t __cdecl _mbsspn(
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const unsigned char *string,
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const unsigned char *charset
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)
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#else
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unsigned char * __cdecl _mbsspnp(
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const unsigned char *string,
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const unsigned char *charset
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)
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#endif
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{
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unsigned char *p, *q;
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#ifndef _RETURN_PTR
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if (0 == __mbcodepage)
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return strspn(string, charset);
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#else
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if (0 == __mbcodepage)
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{
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size_t retval;
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retval = strspn(string, charset);
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return (unsigned char *)(*(string + retval) ? string + retval : NULL);
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}
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#endif
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_mlock(_MB_CP_LOCK);
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/* loop through the string to be inspected */
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for (q = (char *)string; *q; q++) {
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/* loop through the charset */
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for (p = (char *)charset; *p; p++) {
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if (_ISLEADBYTE(*p)) {
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if (((*p == *q) && (p[1] == q[1])) || p[1] == '\0')
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break;
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p++;
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}
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else
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if (*p == *q)
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break;
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}
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if (*p == '\0') /* end of charset? */
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break; /* yes, no match on this char */
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if (_ISLEADBYTE(*q))
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if (*++q == '\0')
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break;
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}
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_munlock(_MB_CP_LOCK);
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#ifndef _RETURN_PTR
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return((size_t) (q - string)); /* index */
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#else
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return((*q) ? q : NULL); /* pointer */
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#endif
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}
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#endif /* _MBCS */
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