strspn, _mbsspn, wcsspn

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Header File

string.h, mbstring.h

Category

Memory and String Manipulation Routines

Prototype

size_t strspn(const char *s1, const char *s2);

size_t wcsspn(const wchar_t *s1, const wchar_t *s2);

size_t _mbsspn(const unsigned char *s1, const unsigned char *s2);

Description

Scans a string for the first segment that is a subset of a given set of characters.

strspn finds the initial segment of string s1 that consists entirely of characters from string s2.

Return Value

strspn returns the length of the initial segment of s1 that consists entirely of characters from s2.

Example

#include <stdio.h>
#include <string.h>
#include <alloc.h>
int main(void)
{
   char *string1 = "1234567890";
   char *string2 = "123DC8";
   int length;
   length = strspn(string1, string2);
   printf("Character where strings differ is at position %d\n", length);
   return 0;
}

Portability

	POSIX	Win32	ANSI C	ANSI C++
strspn	+	+	+	+
_mbsspn		+
wcsspn		+	+	+