mirror of https://github.com/mkerrisk/man-pages
73 lines
2.5 KiB
Groff
73 lines
2.5 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" Modified Mon Apr 12 12:49:57 1993, David Metcalfe
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.\" Modified Sat Jul 24 18:56:22 1993, Rik Faith (faith@cs.unc.edu)
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.\" Modified Wed Feb 20 21:09:36 2002, Ian Redfern (redferni@logica.com)
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.\"
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.TH MEMCHR 3 2003-11-01 "" "Linux Programmer's Manual"
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.SH NAME
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memchr, memrchr \- scan memory for a character
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.SH SYNOPSIS
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.nf
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.B #include <string.h>
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.sp
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.BI "void *memchr(const void *" s ", int " c ", size_t " n );
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.sp
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.BI "void *memrchr(const void *" s ", int " c ", size_t " n );
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.fi
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.SH DESCRIPTION
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The
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.BR memchr ()
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function scans the first \fIn\fP bytes of the memory
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area pointed to by \fIs\fP for the character \fIc\fP. The first byte to
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match \fIc\fP (interpreted as an unsigned character) stops the operation.
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.PP
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The
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.BR memrchr ()
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function is like the
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.BR memchr ()
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function,
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except that it searches backwards from the end of the \fIn\fP bytes
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pointed to by \fIs\fP instead of forwards from the front.
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.SH "RETURN VALUE"
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The \fBmemchr\fP() and \fBmemrchr\fP() functions return a pointer
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to the matching byte or NULL if the character does not occur in
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the given memory area.
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.SH "CONFORMING TO"
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The
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.BR memchr ()
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function conforms to SVID 3, 4.3BSD, ISO 9899, POSIX.
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The
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.BR memrchr ()
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function is a GNU extension, available since glibc 2.1.91.
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.SH "SEE ALSO"
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.BR index (3),
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.BR rindex (3),
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.BR strchr (3),
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.BR strpbrk (3),
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.BR strrchr (3),
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.BR strsep (3),
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.BR strspn (3),
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.BR strstr (3),
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.BR wmemchr (3)
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