.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)

.\"

.\" %%%LICENSE_START(VERBATIM)

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.\" manual provided the copyright notice and this permission notice are

.\" preserved on all copies.

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.\" manual under the conditions for verbatim copying, provided that the

.\" entire resulting derived work is distributed under the terms of a

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.\" Since the Linux kernel and libraries are constantly changing, this

.\" manual page may be incorrect or out-of-date.  The author(s) assume no

.\" responsibility for errors or omissions, or for damages resulting from

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.\" References consulted:

.\"     Linux libc source code

.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)

.\"     386BSD man pages

.\" Modified Mon Apr 12 12:54:34 1993, David Metcalfe

.\" Modified Sat Jul 24 19:13:52 1993, Rik Faith (faith@cs.unc.edu)

.TH INDEX 3 2015-03-02 "GNU" "Linux Programmer's Manual"

.SH NAME

index, rindex \- locate character in string

.SH SYNOPSIS

.nf

.B #include <strings.h>

.PP

.BI "char *index(const char *" s ", int " c );

.PP

.BI "char *rindex(const char *" s ", int " c );

.fi

.SH DESCRIPTION

The

.BR index ()

function returns a pointer to the first occurrence

of the character \fIc\fP in the string \fIs\fP.

.PP

The

.BR rindex ()

function returns a pointer to the last occurrence

of the character \fIc\fP in the string \fIs\fP.

.PP

The terminating null byte (\(aq\\0\(aq) is considered to be a part of the

strings.

.SH RETURN VALUE

The

.BR index ()

and

.BR rindex ()

functions return a pointer to

the matched character or NULL if the character is not found.

.SH ATTRIBUTES

For an explanation of the terms used in this section, see

.BR attributes (7).

.TS

allbox;

lb lb lb

l l l.

Interface	Attribute	Value

T{

.BR index (),

.BR rindex ()

T}	Thread safety	MT-Safe

.TE

.SH CONFORMING TO

4.3BSD; marked as LEGACY in POSIX.1-2001.

POSIX.1-2008 removes the specifications of

.BR index ()

and

.BR rindex (),

recommending

.BR strchr (3)

and

.BR strrchr (3)

instead.

.SH SEE ALSO

.BR memchr (3),

.BR strchr (3),

.BR string (3),

.BR strpbrk (3),

.BR strrchr (3),

.BR strsep (3),

.BR strspn (3),

.BR strstr (3),

.BR strtok (3)

.SH COLOPHON

This page is part of release 4.15 of the Linux

.I man-pages

project.

A description of the project,

information about reporting bugs,

and the latest version of this page,

can be found at

\%https://www.kernel.org/doc/man\-pages/.