x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
STRSTR(3) Linux Programmer's Manual STRSTR(3)
NAME
strstr, strcasestr - locate a substring
SYNOPSIS
#include <string.h>
char *strstr(const char *haystack, const char *needle);
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
char *strcasestr(const char *haystack, const char *needle);
DESCRIPTION
The strstr() function finds the first occurrence of the substring nee-
dle in the string haystack. The terminating null bytes ('\0') are not
compared.
The strcasestr() function is like strstr(), but ignores the case of
both arguments.
RETURN VALUE
These functions return a pointer to the beginning of the located sub-
string, or NULL if the substring is not found.
ATTRIBUTES
Multithreading (see pthreads(7))
The strstr() function is thread-safe.
The strcasestr() function is thread-safe with exceptions. It can be
safely used in multithreaded applications, as long as setlocale(3) is
not called to change the locale during its execution.
CONFORMING TO
The strstr() function conforms to C89 and C99. The strcasestr() func-
tion is a nonstandard extension.
BUGS
Early versions of Linux libc (like 4.5.26) would not allow an empty
needle argument for strstr(). Later versions (like 4.6.27) work cor-
rectly, and return haystack when needle is empty.
SEE ALSO
index(3), memchr(3), rindex(3), strcasecmp(3), strchr(3), string(3),
strpbrk(3), strsep(3), strspn(3), strtok(3), wcsstr(3)
COLOPHON
This page is part of release 3.69 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
http://www.kernel.org/doc/man-pages/.
GNU 2014-01-22 STRSTR(3)
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