.\" 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.
.\"
.\" 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 2008-12-05 "GNU" "Linux Programmer's Manual"
+.TH MEMMEM 3 2014-03-17 "GNU" "Linux Programmer's Manual"
.SH NAME
memmem \- locate a substring
.SH SYNOPSIS
The
.BR memmem ()
function finds the start of the first occurrence
-of the substring \fIneedle\fP of length \fIneedlelen\fP in the memory
-area \fIhaystack\fP of length \fIhaystacklen\fP.
-.SH "RETURN VALUE"
+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 "CONFORMING TO"
+.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 \fIneedle\fP and \fIhaystack\fP arguments were interchanged,
-and a pointer to the end of the first occurrence of \fIneedle\fP
+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 \fIneedle\fP is empty,
-\fIhaystack\-1\fP (instead of \fIhaystack\fP) is 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.
And glibc 2.0 makes it worse, returning a pointer to the
-last byte of \fIhaystack\fP.
+last byte of
+.IR haystack .
This is fixed in glibc 2.1.
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR strstr (3)
+.SH COLOPHON
+This page is part of release 3.65 of the Linux
+.I man-pages
+project.
+A description of the project,
+and information about reporting bugs,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.