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

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       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

GNU                              2016-03-15                        STRSEP(3)