68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
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/***
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* mbschr.c - Search MBCS string for character
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*
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* Copyright (c) 1985-1993, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Search MBCS string for a character
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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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* 05-12-93 KRS Fix handling of c=='\0'.
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* 08-20-93 CFW Change param type to int, use new style param declarators.
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*
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*******************************************************************************/
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#ifdef _MBCS
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#include <cruntime.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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/***
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* _mbschr - Search MBCS string for character
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*
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*Purpose:
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* Search the given string for the specified character.
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* MBCS characters are handled correctly.
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*
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*Entry:
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* unsigned char *string = string to search
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* int c = character to search for
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*
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*Exit:
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* returns a pointer to the first occurence of the specified char
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* within the string.
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*
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* returns NULL if the character is not found n the string.
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*
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*Exceptions:
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*
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*******************************************************************************/
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unsigned char * _CRTAPI1 _mbschr(
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const unsigned char *string,
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unsigned int c
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)
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{
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unsigned short cc;
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for (; (cc = *string); string++) {
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if (_ISLEADBYTE(cc)) {
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if (*++string == '\0')
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return NULL; /* error */
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if ( c == (unsigned int)((cc << 8) | *string) ) /* DBCS match */
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return (unsigned char *)(string - 1);
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}
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else if (c == (unsigned int)cc)
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break; /* SBCS match */
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}
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if (c == (unsigned int)cc) /* check for SBCS match--handles NUL char */
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return (unsigned char *)(string);
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return NULL;
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}
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#endif /* _MBCS */
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