Finds the first character in a string that does not belong to a set of characters in a substring.

#include <string.h>

size_t strspn (const char *string1, const char *string2);
size_t wcsspn(const wchar_t *string1, const wchar_t *string2);

Parameters

string1

String to search.

string2

Character set.

Remarks

The null character terminating string2 is not considered in the matching process.

Return Values

An integer value specifying the length of the substring in string1 consisting entirely of characters in string2.

Success.

0 (zero) if string1 begins with a character not in string2.

Failure.

Generic Text Routines

Requirements