Name

strspn - search a string for a set of characters

Library

libc.lib

Synopsis

  #include <string.h>
  size_t strspn (const char *s, const char *charset);

Return values

strspn function returns the number of characters in the initial segment of s which consists only of characters from accept

Detailed description

The strspn function spans the initial part of the null-terminated string s as long as the characters from s occur in the null-terminated string charset. In other words, it computes the string array index in s of the first character of s which is not in charset, else the index of the first null character.

Examples

#include <string.h>
#include <stdio.h>
int main()
{
    char one[50];
    int res;
    strcpy(one,"abcba");
    res = strspn(one, "abc");
    printf(" %d times characters found in the string \n",res);
    return 0;
}

Output 

5 times characters found in the string

Return values

The strspn function returns the number of characters spanned.

See also

memchr, strchr, strpbrk, strsep, strstr, strtok

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