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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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mbsspn.c
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C/C++ Source or Header
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1998-06-17
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121 lines
/***
*mbsspn.c - Search for init substring of chars from control string (MBCS).
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Search for init substring of chars from control string (MBCS).
*
*******************************************************************************/
#ifdef _MBCS
#include <mtdll.h>
#include <cruntime.h>
#include <string.h>
#include <mbdata.h>
#include <mbctype.h>
#include <mbstring.h>
#include <stddef.h>
#include <tchar.h>
/***
*ifndef _RETURN_PTR
* _mbsspn - Find first string char not in charset (MBCS)
*else
* _mbsspnp - Find first string char not in charset, return pointer (MBCS)
*endif
*
*Purpose:
* Returns maximum leading segment of string consisting solely
* of characters from charset. Handles MBCS characters correctly.
*
*Entry:
* unsigned char *string = string to search in
* unsigned char *charset = set of characters to scan over
*
*Exit:
*
*ifndef _RETURN_PTR
* Returns index of first char in string not in control.
* Returns 0, if string begins with a character not in charset.
*else
* Returns pointer to first character not in charset.
* Returns NULL if string consists entirely of characters from charset.
*endif
*
*Exceptions:
*
*******************************************************************************/
#ifndef _RETURN_PTR
size_t __cdecl _mbsspn(
const unsigned char *string,
const unsigned char *charset
)
#else /* _RETURN_PTR */
unsigned char * __cdecl _mbsspnp(
const unsigned char *string,
const unsigned char *charset
)
#endif /* _RETURN_PTR */
{
unsigned char *p, *q;
#ifndef _RETURN_PTR
if ( _ISNOTMBCP )
return strspn(string, charset);
#else /* _RETURN_PTR */
if ( _ISNOTMBCP )
{
size_t retval;
retval = strspn(string, charset);
return (unsigned char *)(*(string + retval) ? string + retval : NULL);
}
#endif /* _RETURN_PTR */
_mlock(_MB_CP_LOCK);
/* loop through the string to be inspected */
for (q = (char *)string; *q; q++) {
/* loop through the charset */
for (p = (char *)charset; *p; p++) {
if (_ISLEADBYTE(*p)) {
if (((*p == *q) && (p[1] == q[1])) || p[1] == '\0')
break;
p++;
}
else
if (*p == *q)
break;
}
if (*p == '\0') /* end of charset? */
break; /* yes, no match on this char */
if (_ISLEADBYTE(*q))
if (*++q == '\0')
break;
}
_munlock(_MB_CP_LOCK);
#ifndef _RETURN_PTR
return((size_t) (q - string)); /* index */
#else /* _RETURN_PTR */
return((*q) ? q : NULL); /* pointer */
#endif /* _RETURN_PTR */
}
#endif /* _MBCS */