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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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mbschr.c
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C/C++ Source or Header
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1998-06-17
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2KB
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84 lines
/***
* mbschr.c - Search MBCS string for character
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Search MBCS string for a character
*
*******************************************************************************/
#ifdef _MBCS
#include <mtdll.h>
#include <cruntime.h>
#include <string.h>
#include <mbdata.h>
#include <mbctype.h>
#include <mbstring.h>
#include <stddef.h>
/***
* _mbschr - Search MBCS string for character
*
*Purpose:
* Search the given string for the specified character.
* MBCS characters are handled correctly.
*
*Entry:
* unsigned char *string = string to search
* int c = character to search for
*
*Exit:
* returns a pointer to the first occurence of the specified char
* within the string.
*
* returns NULL if the character is not found n the string.
*
*Exceptions:
*
*******************************************************************************/
unsigned char * __cdecl _mbschr(
const unsigned char *string,
unsigned int c
)
{
unsigned short cc;
if ( _ISNOTMBCP )
return strchr(string, c);
_mlock(_MB_CP_LOCK);
for (; (cc = *string); string++)
{
if (_ISLEADBYTE(cc))
{
if (*++string == '\0')
{
_munlock(_MB_CP_LOCK);
return NULL; /* error */
}
if ( c == (unsigned int)((cc << 8) | *string) ) /* DBCS match */
{
_munlock(_MB_CP_LOCK);
return (unsigned char *)(string - 1);
}
}
else if (c == (unsigned int)cc)
break; /* SBCS match */
}
_munlock(_MB_CP_LOCK);
if (c == (unsigned int)cc) /* check for SBCS match--handles NUL char */
return (unsigned char *)(string);
return NULL;
}
#endif /* _MBCS */