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strsep(3)

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  re‐
       turns the original value of *stringp.

ATTRIBUTES
       For  an  explanation  of  the  terms  used in this section, see attrib‐
       utes(7).  allbox;  lb  lb  lb  l  l  l.   Interface Attribute Value  T{
       strsep() T}   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 5.02 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                               2019-03-06                         STRSEP(3)
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