STRSPN(3)

NAME
       strspn, strcspn - search a string for a set of characters

SYNOPSIS
       #include <<string.h>>

       size_t strspn(const char *s, const char *accept);

       size_t strcspn(const char *s, const char *reject);

DESCRIPTION
       The strspn() function calculates the length of the initial
       segment of s which  consists  entirely  of  characters  in
       accept.

       The  strcspn()  function calculates the length of the ini-
       tial segment of s which consists  entirely  of  characters
       not in reject.

RETURN VALUE
       The  strspn() function returns the number of characters in
       the initial segment of s which consist only of  characters
       from accept.

       The strcspn() function returns the number of characters in
       the initial segment of s  which  are  not  in  the  string
       reject.

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       index(3) memchr(3) rindex(3) strchr(3) strpbrk(3) 
       strsep(3) strstr(3) strtok(3)