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
       attributes(7).

       allbox; lbw19 lb lb l  l  l.   Interface Attribute Value  T{  strspn(),
       strcspn() T}   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 4.16 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)