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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
       returns the original value of *stringp.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(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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