strcspn

STRSPN(3)                  Linux Programmer's Manual                 STRSPN(3)

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 seg-
       ment of s which consist only of bytes from accept.

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

ATTRIBUTES
       For  an  explanation  of  the  terms  used  in  this  section,  see at-
       tributes(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
       This  page  is  part of release 5.05 of the Linux man-pages project.  A
       description of the project, 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)