strsep(3) — Linux manual page


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

NAME         top

       strsep - extract token from string

SYNOPSIS         top

       #include <string.h>

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

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

           Since glibc 2.19:
           Glibc 2.19 and earlier:

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

       │Interface Attribute     Value   │
       │strsep()  │ Thread safety │ MT-Safe │

CONFORMING TO         top


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 5.08 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

GNU                              2019-03-06                        STRSEP(3)

Pages that refer to this page: index(3)memchr(3)memrchr(3)rawmemchr(3)rindex(3)strcasestr(3)strchr(3)strchrnul(3)strcspn(3)string(3)strpbrk(3)strrchr(3)strspn(3)strstr(3)strtok(3)strtok_r(3)