1 '\" te
2 .\" Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved Portions Copyright (c) 1992, X/Open Company Limited All Rights Reserved
3 .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
4 .\" http://www.opengroup.org/bookstore/.
5 .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
6 .\" This notice shall appear on any product containing this material.
7 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
8 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
9 .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
10 .TH INDEX 3C "Jul 24, 2002"
11 .SH NAME
12 index, rindex \- string operations
13 .SH SYNOPSIS
14 .LP
15 .nf
16 #include <strings.h>
17
18 \fBchar *\fR\fBindex\fR(\fBconst char *\fR\fIs\fR, \fBint\fR \fIc\fR);
19 .fi
20
21 .LP
22 .nf
23 \fBchar *\fR\fBrindex\fR(\fBconst char *\fR\fIs\fR, \fBint\fR \fIc\fR);
24 .fi
25
26 .SH DESCRIPTION
27 .sp
28 .LP
29 The \fBindex()\fR and \fBrindex()\fR functions operate on null-terminated
30 strings.
31 .sp
32 .LP
33 The \fBindex()\fR function returns a pointer to the first occurrence of
34 character \fIc\fR in string \fIs\fR.
35 .sp
36 .LP
37 The \fBrindex()\fR function returns a pointer to the last occurrence of
38 character \fIc\fR in string \fIs\fR.
39 .sp
40 .LP
41 Both \fBindex()\fR and \fBrindex()\fR return a null pointer if \fIc\fR does
42 not occur in the string. The null character terminating a string is considered
43 to be part of the string.
44 .SH USAGE
45 .sp
46 .LP
47 On most modern computer systems, you can \fInot\fR use a null pointer to
48 indicate a null string. A null pointer is an error and results in an abort of
49 the program. If you wish to indicate a null string, you must use a pointer
50 that points to an explicit null string. On some machines and with some
51 implementations of the C programming language, a null pointer, if dereferenced,
52 would yield a null string. Though often used, this practice is not always
53 portable. Programmers using a null pointer to represent an empty string should
54 be aware of this portability issue. Even on machines where dereferencing a
55 null pointer does not cause an abort of the program, it does not necessarily
56 yield a null string.
57 .SH ATTRIBUTES
58 .sp
59 .LP
60 See \fBattributes\fR(5) for descriptions of the following attributes:
61 .sp
62
63 .sp
64 .TS
65 box;
66 c | c
67 l | l .
68 ATTRIBUTE TYPE ATTRIBUTE VALUE
69 _
70 Interface Stability Standard
71 .TE
72
73 .SH SEE ALSO
74 .sp
75 .LP
76 \fBbstring\fR(3C), \fBmalloc\fR(3C), \fBstring\fR(3C), \fBattributes\fR(5),
77 \fBstandards\fR(5)
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1 .\" Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved Portions Copyright (c) 1992, X/Open Company Limited All Rights Reserved
2 .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
3 .\" http://www.opengroup.org/bookstore/.
4 .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
5 .\" This notice shall appear on any product containing this material.
6 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
7 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
8 .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
9 .Dd "Jul 20, 2014"
10 .Dt INDEX 3C
11 .Os
12 .Sh NAME
13 .Nm index, rindex
14 .Nd locate character in string
15 .Sh SYNOPSIS
16 .In strings.h
17 .Ft char *
18 .Fn index "const char *s" "int c"
19 .Ft char *
20 .Fn rindex "const char *s" "int c"
21 .Sh DESCRIPTION
22 The
23 .Fn index
24 and
25 .Fn rindex
26 functions operate on null-terminated strings.
27 .Lp
28 The
29 .Fn index
30 function returns a pointer to the first occurrence of
31 character
32 .Fa c
33 in string
34 .Fa s .
35 .Lp
36 The
37 .Fn rindex
38 function returns a pointer to the last occurrence of
39 character
40 .Fa c
41 in string
42 .Fa s .
43 .Lp
44 Both
45 .Fn index
46 and
47 .Fa rindex
48 return a null pointer if
49 .Fa c
50 does
51 not occur in the string. The null character terminating a string is considered
52 to be part of the string.
53 .Sh USAGE
54 The
55 .Xr strchr 3C
56 and
57 .Xr strrchr 3C
58 should be used in portable applications; those functions are specified in
59 .St -isoC
60 whereas these are not.
61 .Sh INTERFACE STABILITY
62 .Sy Obsolete Standard .
63 .Sh MT-LEVEL
64 .Sy Async-Signal-Safe .
65 .Sh SEE ALSO
66 .Xr bstring 3C ,
67 .Xr malloc 3C ,
68 .Xr string 3C ,
69 .Xr standards 5
70 .Sh STANDARDS
71 These functions were part of
72 .At v6 ,
73 were added in
74 .St -p1003.1-2001 ,
75 and subsequently removed from
76 .St -p1003.1-2008 .
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