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STRSEP(3)                  Linux Programmer's Manual                 STRSEP(3)
NAME
       strsep - extract token from string
SYNOPSIS
       #include <string.h>
       char *strsep(char **stringp, const char *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 noth-
       ing 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)  con-
       forms 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), str-
       spn(3), strstr(3), strtok(3)
COLOPHON
       This page is part of release 4.15 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                               2016-03-15                         STRSEP(3)