strcspn, wcscspn, _mbscspn

Find a substring in a string.

size_tstrcspn(constchar*string,constchar*strCharSet);

size_twcscspn(constwchar_t*string,constwchar_t*strCharSet);

size_t_mbscspn(constunsignedchar*string,constunsignedchar*strCharSet);

Routine	Required Header	Compatibility
strcspn	<string.h>	ANSI, Win 95, Win NT
wcscspn	<string.h> or <wchar.h>	ANSI, Win 95, Win NT
_mbscspn	<mbstring.h>	Win 95, Win NT

For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB	Single thread static library, retail version
LIBCMT.LIB	Multithread static library, retail version
MSVCRT.LIB	Import library for MSVCRT.DLL, retail version

Return Value

Each of these functions returns an integer value specifying the length of the initial segment of string that consists entirely of characters not in strCharSet. If string begins with a character that is in strCharSet, the function returns 0. No return value is reserved to indicate an error.

Parameters

string

Null-terminated searched string

strCharSet

Null-terminated character set

Remarks

The strcspn function returns the index of the first occurrence of a character in string that belongs to the set of characters in strCharSet. Terminating null characters are included in the search.

wcscspn and _mbscspn are wide-character and multibyte-character versions of strcspn. The arguments of wcscspn are wide-character strings; those of _mbscspn are multibyte-character strings. These three functions behave identically otherwise.

Generic-Text Routine Mappings

TCHAR.H Routine	_UNICODE & _MBCS Not Defined	_MBCS Defined	_UNICODE Defined
_tcscspn	strcspn	_mbscspn	wcscspn

Example

/* STRCSPN.C */

#include <string.h>
#include <stdio.h>

void main( void )
{
   char string[] = "xyzabc";
   int  pos;

   pos = strcspn( string, "abc" );
   printf( "First a, b or c in %s is at character %d\n",
           string, pos );
}

Output

First a, b or c in xyzabc is at character 3

String Manipulation Routines

See Also   strncat, strncmp, strncpy, _strnicmp, strrchr, strspn