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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

       #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 '\0'  characters  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 substring,  or
       NULL if the substring is not found.

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),	  fea‐
       ture_test_macros(7)

COLOPHON
       This page is part of release 3.27 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2010-09-20			     STRSTR(3)

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