STRSTR(3)		   Linux Programmers Manual		    STRSTR(3)



NAME
       strstr, strcasestr - locate a substring

SYNOPSIS
       #include 

       char *strstr(const char *haystack, const char *needle);

       #define _GNU_SOURCE

       #include 

       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 non-standard 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),  strpbrk(3),
       strsep(3), strspn(3), strtok(3), wcsstr(3), feature_test_macros(7)

COLOPHON
       This  page  is  part of release 3.05 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				  2005-04-05			     STRSTR(3)