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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/memchr.3
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 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 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-memchr, memrchr, rawmemchr \- scan memory for a character
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <string.h>
-.P
-.BI "void *memchr(const void " s [. n "], int " c ", size_t " n );
-.BI "void *memrchr(const void " s [. n "], int " c ", size_t " n );
-.P
-.BI "[[deprecated]] void *rawmemchr(const void *" s ", int " c );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR memrchr (),
-.BR rawmemchr ():
-.nf
- _GNU_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR memchr ()
-function scans the initial
-.I n
-bytes of the memory
-area pointed to by
-.I s
-for the first instance of
-.IR c .
-Both
-.I c
-and the bytes of the memory area pointed to by
-.I s
-are interpreted as
-.IR "unsigned char" .
-.P
-The
-.BR memrchr ()
-function is like the
-.BR memchr ()
-function,
-except that it searches backward from the end of the
-.I n
-bytes pointed to by
-.I s
-instead of forward from the beginning.
-.P
-The
-.BR rawmemchr ()
-function is similar to
-.BR memchr (),
-but it assumes
-(i.e., the programmer knows for certain)
-that an instance of
-.I c
-lies somewhere in the memory area starting at the location pointed to by
-.IR s .
-If an instance of
-.I c
-is not found, the behavior is undefined.
-Use either
-.BR strlen (3)
-or
-.BR memchr (3)
-instead.
-.SH RETURN VALUE
-The
-.BR memchr ()
-and
-.BR memrchr ()
-functions return a pointer
-to the matching byte or NULL if the character does not occur in
-the given memory area.
-.P
-The
-.BR rawmemchr ()
-function returns a pointer to the matching byte.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR memchr (),
-.BR memrchr (),
-.BR rawmemchr ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-.TP
-.BR memchr ()
-C11, POSIX.1-2008.
-.TP
-.BR memrchr ()
-.TQ
-.BR rawmemchr ()
-GNU.
-.SH HISTORY
-.TP
-.BR memchr ()
-POSIX.1-2001, C89, SVr4, 4.3BSD.
-.TP
-.BR memrchr ()
-glibc 2.2.
-.TP
-.BR rawmemchr ()
-glibc 2.1.
-.SH SEE ALSO
-.BR bstring (3),
-.BR ffs (3),
-.BR memmem (3),
-.BR strchr (3),
-.BR strpbrk (3),
-.BR strrchr (3),
-.BR strsep (3),
-.BR strspn (3),
-.BR strstr (3),
-.BR wmemchr (3)