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 at-
tributes(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 5.07 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)