Syntax
#include <string.h>
size_t strspn(const char *string1, const char *string2);
Arguments
string1 character string to be searched
string2 character string to find
Return Value
The length of the initial segment of string1 that contains string2 in its entirety
Description
It computes the length of the maximum initial segment of string1 that completely holds string2 and then returns the length of the segment.