diff options
Diffstat (limited to 'upstream/opensuse-leap-15-6/man3/memchr.3')
| -rw-r--r-- | upstream/opensuse-leap-15-6/man3/memchr.3 | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/upstream/opensuse-leap-15-6/man3/memchr.3 b/upstream/opensuse-leap-15-6/man3/memchr.3 new file mode 100644 index 00000000..7e04efb2 --- /dev/null +++ b/upstream/opensuse-leap-15-6/man3/memchr.3 @@ -0,0 +1,145 @@ +'\" 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 2023-03-30 "Linux man-pages 6.04" +.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> +.PP +.BI "void *memchr(const void " s [. n "], int " c ", size_t " n ); +.BI "void *memrchr(const void " s [. n "], int " c ", size_t " n ); +.PP +.BI "[[deprecated]] void *rawmemchr(const void " s [. n "], int " c ); +.fi +.PP +.RS -4 +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.RE +.PP +.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" . +.PP +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. +.PP +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. +.PP +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). +.ad l +.nh +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.BR memchr (), +.BR memrchr (), +.BR rawmemchr () +T} Thread safety MT-Safe +.TE +.hy +.ad +.sp 1 +.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) |