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RedHat 9 (Linux i386) - man page for memmem (redhat section 3)

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

NAME
       memmem - locate a substring

SYNOPSIS
       #define _GNU_SOURCE
       #include <string.h>

       void *memmem(const void *haystack, size_t haystacklen,
		    const void *needle, size_t needlelen);

DESCRIPTION
       The  memmem()  function finds the start of the first occurrence of the substring needle of
       length needlelen in the memory area haystack of length haystacklen.

RETURN VALUE
       The memmem() function returns a pointer to the beginning of the substring, or NULL if  the
       substring is not found.

CONFORMING TO
       This function is a GNU extension.

BUGS
       This  function  was  broken  in	Linux libraries up to and including libc 5.0.9; there the
       `needle' and `haystack' arguments were interchanged, and a pointer to the end of the first
       occurrence  of needle was returned.  Since libc 5.0.9 is still widely used, this is a dan-
       gerous function to use.
       Both old and new libc's have the bug that  if  needle  is  empty  haystack-1  (instead  of
       haystack)  is  returned.   And glibc 2.0 makes it worse, and returns a pointer to the last
       byte of `haystack'. This is fixed in glibc 2.1.

SEE ALSO
       strstr(3)

GNU					    1998-01-13					MEMMEM(3)


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