425289a9db
<strings.h> as the associated header file.
The prototypes have been moved there from <string.h> because
POSIX.1-2001 said so.
- Conditionally include either <strings.h> or <string.h> based
on whether the [r]index() or str[r]chr() functions are
compiled, respectively.
- Style(9) tells us to
- put a space after the return keyword
- to check for a NUL character without using the ! operator.
- use NULL instead of (type *)NULL where the compiler knows
the type.
Apply these rules.
- Rather use ANSI-C function definitions than K&R ones.
- For index(3), correct second function argument's type; it was
declared to be a `const char' before and is now an `int'.
91 lines
2.8 KiB
Groff
91 lines
2.8 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Chris Torek.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)index.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt INDEX 3
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.Os
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.Sh NAME
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.Nm index
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.Nd locate character in string
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In strings.h
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.Ft char *
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.Fn index "const char *s" "int c"
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.Sh DESCRIPTION
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The
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.Fn index
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function
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locates the first character matching
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.Fa c
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(converted to a
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.Em char )
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in the null-terminated string
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.Fa s .
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.Sh RETURN VALUES
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A pointer to the character is returned if it is found; otherwise
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.Dv NULL
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is returned.
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If
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.Fa c
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is '\e0',
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.Fn index
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locates the terminating '\e0'.
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.Sh SEE ALSO
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.Xr memchr 3 ,
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.Xr rindex 3 ,
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.Xr strchr 3 ,
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.Xr strcspn 3 ,
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.Xr strpbrk 3 ,
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.Xr strrchr 3 ,
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.Xr strsep 3 ,
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.Xr strspn 3 ,
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.Xr strstr 3 ,
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.Xr strtok 3
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.Sh HISTORY
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A
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.Fn index
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function appeared in
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.At v6 .
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Its prototype existed previously in
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.Aq Pa string.h
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before it was moved to
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.Aq Pa strings.h
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for
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.St -p1003.1-2001
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compliance.
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