NAME

       strspn, strcspn - get length of a prefix substring

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  (in  bytes)  of the initial segment of s which consists
       entirely of bytes in accept.

       The strcspn() function calculates the length of the initial segment of s which consists entirely of bytes
       not in reject.

RETURN VALUE

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

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

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌────────────────────┬───────────────┬─────────┐
       │Interface           │ Attribute     │ Value   │
       ├────────────────────┼───────────────┼─────────┤
       │strspn(), strcspn() │ Thread safety │ MT-Safe │
       └────────────────────┴───────────────┴─────────┘

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.

SEE ALSO

       index(3),  memchr(3),  rindex(3),  strchr(3),  string(3),  strpbrk(3),  strsep(3),  strstr(3), strtok(3),
       wcscspn(3), wcsspn(3)

COLOPHON

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       information   about   reporting   bugs,   and   the  latest  version  of  this  page,  can  be  found  at
       https://www.kernel.org/doc/man-pages/.

                                                   2015-08-08                                          STRSPN(3)