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[linuxjm/LDP_man-pages.git] / original / man3 / memmem.3

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-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     386BSD man pages
-.\" Modified Sat Jul 24 18:50:48 1993 by Rik Faith (faith@cs.unc.edu)
-.\" Interchanged 'needle' and 'haystack'; added history, aeb, 980113.
-.TH MEMMEM 3  2014-08-19 "GNU" "Linux Programmer's Manual"
-.SH NAME
-memmem \- locate a substring
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
-.B #include <string.h>
-.sp
-.BI "void *memmem(const void *" haystack ", size_t " haystacklen ,
-.BI "             const void *" needle ", size_t " needlelen  );
-.fi
-.SH DESCRIPTION
-The
-.BR memmem ()
-function finds the start of the first occurrence
-of the substring
-.IR needle
-of length
-.I needlelen
-in the memory
-area
-.I haystack
-of length
-.IR haystacklen .
-.SH RETURN VALUE
-The
-.BR memmem ()
-function returns a pointer to the beginning of the
-substring, or NULL if the substring is not found.
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR memmem ()
-function is thread-safe.
-.SH CONFORMING TO
-This function is a GNU extension.
-.SH BUGS
-.\" This function was broken in Linux libraries up to and including libc 5.0.9;
-.\" there the
-.\" .IR needle
-.\" and
-.\" .I haystack
-.\" arguments were interchanged,
-.\" and a pointer to the end of the first occurrence of
-.\" .I needle
-.\" was returned.
-.\"
-.\" Both old and new libc's have the bug that if
-.\" .I needle
-.\" is empty,
-.\" .I haystack\-1
-.\" (instead of
-.\" .IR haystack )
-.\" is returned.
-In glibc 2.0, if
-.I needle
-is empty,
-.BR memmem ()
-returns a pointer to the last byte of
-.IR haystack .
-This is fixed in glibc 2.1.
-.SH SEE ALSO
-.BR strstr (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I 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/.