.\" and Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
+.\" %%%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
.\"
.\" 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)
.\" 2008-07-09, mtk, add rawmemchr()
.\"
-.TH MEMCHR 3 2012-04-23 "" "Linux Programmer's Manual"
+.TH MEMCHR 3 2017-09-15 "" "Linux Programmer's Manual"
.SH NAME
memchr, memrchr, rawmemchr \- scan memory for a character
.SH SYNOPSIS
.nf
.B #include <string.h>
-
+.PP
.BI "void *memchr(const void *" s ", int " c ", size_t " n );
-
+.PP
.BI "void *memrchr(const void *" s ", int " c ", size_t " n );
-
+.PP
.BI "void *rawmemchr(const void *" s ", int " c );
.fi
-.sp
+.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
-.sp
+.PP
.BR memrchr (),
.BR rawmemchr ():
_GNU_SOURCE
bytes pointed to by
.I s
instead of forward from the beginning.
-
+.PP
The
.BR rawmemchr ()
function is similar to
is not found, the results are unpredictable.
The following call is a fast means of locating a string's
terminating null byte:
+.PP
.in +4n
-.nf
-
+.EX
char *p = rawmemchr(s,\ \(aq\\0\(aq);
-.fi
+.EE
.in
-.SH "RETURN VALUE"
+.SH RETURN VALUE
The
.BR memchr ()
and
functions return a pointer
to the matching byte or NULL if the character does not occur in
the given memory area.
-
+.PP
The
.BR rawmemchr ()
function returns a pointer to the matching byte, if one is found.
.SH VERSIONS
.BR rawmemchr ()
first appeared in glibc in version 2.1.
-
+.PP
.BR memrchr ()
first appeared in glibc in version 2.2.
-.SH "CONFORMING TO"
-The
-.BR memchr ()
-function conforms to SVr4, 4.3BSD, C89, C99, POSIX.1-2001.
-
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbw32 lb lb
+l l l.
+Interface Attribute Value
+T{
+.BR memchr (),
+.BR memrchr (),
+.BR rawmemchr ()
+T} Thread safety MT-Safe
+.TE
+.SH CONFORMING TO
+.BR memchr ():
+POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
+.PP
The
.BR memrchr ()
function is a GNU extension, available since glibc 2.1.91.
-
+.PP
The
.BR rawmemchr ()
function is a GNU extension, available since glibc 2.1.
-.SH "SEE ALSO"
+.SH SEE ALSO
+.BR bstring (3),
.BR ffs (3),
.BR index (3),
+.BR memmem (3),
.BR rindex (3),
.BR strchr (3),
.BR strpbrk (3),