strsep(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | BUGS | SEE ALSO | COLOPHON

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

NAME         top

       strsep - extract token from string

SYNOPSIS         top

       #include <string.h>

       char *strsep(char **restrict stringp, const char *restrict delim);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       strsep():
           Since glibc 2.19:
               _DEFAULT_SOURCE
           Glibc 2.19 and earlier:
               _BSD_SOURCE

DESCRIPTION         top

       If *stringp is NULL, the strsep() function returns NULL and does
       nothing else.  Otherwise, this function finds the first token in
       the string *stringp, that is delimited by one of the bytes in the
       string delim.  This token is terminated by overwriting the
       delimiter with a null byte ('\0'), and *stringp is updated to
       point past the token.  In case no delimiter was found, the token
       is taken to be the entire string *stringp, and *stringp is made
       NULL.

RETURN VALUE         top

       The strsep() function returns a pointer to the token, that is, it
       returns the original value of *stringp.

ATTRIBUTES         top

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

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

CONFORMING TO         top

       4.4BSD.

NOTES         top

       The strsep() function was introduced as a replacement for
       strtok(3), since the latter cannot handle empty fields.  However,
       strtok(3) conforms to C89/C99 and hence is more portable.

BUGS         top

       Be cautious when using this function.  If you do use it, note
       that:

       * This function modifies its first argument.

       * This function cannot be used on constant strings.

       * The identity of the delimiting character is lost.

SEE ALSO         top

       index(3), memchr(3), rindex(3), strchr(3), string(3), strpbrk(3),
       strspn(3), strstr(3), strtok(3)

COLOPHON         top

       This page is part of release 5.12 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/.

GNU                            2021-03-22                      STRSEP(3)

Pages that refer to this page: index(3)memchr(3)strchr(3)string(3)strpbrk(3)strspn(3)strstr(3)strtok(3)