NAME

       strsep - extract token from string

SYNOPSIS

       #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

       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

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

ATTRIBUTES

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

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

CONFORMING TO

       4.4BSD.

NOTES

       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

       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

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

COLOPHON

       This  page  is  part of release 5.13 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/.