strstr man page on Archlinux

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STRSTR(3)		   Linux Programmer's Manual		     STRSTR(3)

       strstr, strcasestr - locate a substring

       #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);

       The  strstr() function finds the first occurrence of the substring nee‐
       dle in the string haystack.  The terminating null bytes ('\0') are  not

       The  strcasestr()  function  is	like strstr(), but ignores the case of
       both arguments.

       These functions return a pointer to the beginning of the	 located  sub‐
       string, or NULL if the substring is not found.

   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.

       The  strstr() function conforms to C89 and C99.	The strcasestr() func‐
       tion is a nonstandard extension.

       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.

       index(3), memchr(3), rindex(3),	strcasecmp(3),	strchr(3),  string(3),
       strpbrk(3), strsep(3), strspn(3), strtok(3), wcsstr(3)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

GNU				  2014-01-22			     STRSTR(3)

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