Libc-825.24.tar.gz

[apple/libc.git] / string / index.3

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-.\" Copyright (c) 1990, 1991, 1993
-.\"    The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Chris Torek.
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)index.3    8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/string/index.3,v 1.12 2007/01/09 00:28:12 imp Exp $
-.\"
-.Dd June 4, 1993
-.Dt INDEX 3
-.Os
-.Sh NAME
-.Nm index , rindex
-.Nd locate character in string
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In strings.h
-.Ft "char *"
-.Fn index "const char *s" "int c"
-.Ft "char *"
-.Fn rindex "const char *s" "int c"
-.Sh DESCRIPTION
-The
-.Fn index
-function
-locates the first occurrence of
-.Fa c
-(converted to a
-.Vt char )
-in the string pointed to by
-.Fa s .
-The terminating null character is considered to be part of the string;
-therefore, if
-.Fa c
-is
-.Ql \e0 ,
-the functions locate the terminating
-.Ql \e0 .
-.Pp
-The
-.Fn rindex
-function is identical to
-.Fn index ,
-except that it locates the last occurrence of
-.Fa c .
-.Sh RETURN VALUES
-The functions
-.Fn index
-and
-.Fn rindex
-return a pointer to the located character, or
-.Dv NULL
-if the character does not appear in the string.
-.Sh SEE ALSO
-.Xr memchr 3 ,
-.Xr strchr 3 ,
-.Xr strcspn 3 ,
-.Xr strpbrk 3 ,
-.Xr strrchr 3 ,
-.Xr strsep 3 ,
-.Xr strspn 3 ,
-.Xr strstr 3 ,
-.Xr strtok 3
-.Sh HISTORY
-The
-.Fn index
-and
-.Fn rindex
-functions appeared in
-.At v6 .
-Their prototypes existed previously in
-.In string.h
-before they were moved to
-.In strings.h
-for
-.St -p1003.1-2001
-compliance.