.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" Modified Mon Apr 12 12:49:57 1993, David Metcalfe
.\" Modified Sat Jul 24 18:56:22 1993, Rik Faith (faith@cs.unc.edu)
.\" Modified Wed Feb 20 21:09:36 2002, Ian Redfern (redferni@logica.com)
.\"
.TH MEMCHR 3  2003-11-01 "" "Linux Programmer's Manual"
.SH NAME
memchr, memrchr \- scan memory for a character
.SH SYNOPSIS
.nf
.B #include <string.h>
.sp
.BI "void *memchr(const void *" s ", int " c ", size_t " n );
.sp
.BI "void *memrchr(const void *" s ", int " c ", size_t " n );
.fi
.SH DESCRIPTION
The 
.BR memchr ()
function scans the first \fIn\fP bytes of the memory
area pointed to by \fIs\fP for the character \fIc\fP.  The first byte to
match \fIc\fP (interpreted as an unsigned character) stops the operation.
.PP
The 
.BR memrchr ()
function is like the 
.BR memchr ()
function,
except that it searches backwards from the end of the \fIn\fP bytes
pointed to by \fIs\fP instead of forwards from the front.
.SH "RETURN VALUE"
The \fBmemchr\fP() and \fBmemrchr\fP() functions return a pointer
to the matching byte or NULL if the character does not occur in
the given memory area.
.SH "CONFORMING TO"
The 
.BR memchr ()
function conforms to SVr4, 4.3BSD, C99.
The 
.BR memrchr ()
function is a GNU extension, available since glibc 2.1.91.
.SH "SEE ALSO"
.BR index (3),
.BR rindex (3),
.BR strchr (3),
.BR strpbrk (3),
.BR strrchr (3),
.BR strsep (3),
.BR strspn (3),
.BR strstr (3),
.BR wmemchr (3)