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96 lines
2.9 KiB
Groff
96 lines
2.9 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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.\"
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.TH INDEX 3 "27 January 1997" GNO "Library Routines"
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.SH NAME
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.BR index ,
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.BR rindex
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\- locate character in string
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.SH SYNOPSIS
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#include <string.h>
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.sp 1
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char *
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\fBindex\fR (const char *\fIs\fR, int \fIc\fR);
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.br
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char *
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\fBrindex\fR (const char *\fIs\fR, int \fIc\fR);
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.SH DESCRIPTION
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The
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.BR index
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function
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locates the first character matching
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.I c
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(converted to a
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.IR char )
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in the null-terminated string
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.IR s .
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.LP
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The
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.BR rindex
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function
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locates the last character
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matching
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.I c
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(converted to a
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.IR char )
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in the null-terminated string
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.IR 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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NULL is returned.
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If
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.I c
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is '\\0',
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.BR index
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and
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.BR rindex
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locate the terminating '\\0'.
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.SH SEE ALSO
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.BR memchr (3),
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.BR strchr (3),
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.BR strcspn (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 strtok (3)
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.SH HISTORY
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Both an
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.BR index
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and
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.BR rindex
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function appeared in v6.
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