mirror of https://github.com/mkerrisk/man-pages
141 lines
3.4 KiB
Groff
141 lines
3.4 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
|
|
.\"
|
|
.\" %%%LICENSE_START(VERBATIM)
|
|
.\" Permission is granted to make and distribute verbatim copies of this
|
|
.\" manual provided the copyright notice and this permission notice are
|
|
.\" preserved on all copies.
|
|
.\"
|
|
.\" Permission is granted to copy and distribute modified versions of this
|
|
.\" manual under the conditions for verbatim copying, provided that the
|
|
.\" entire resulting derived work is distributed under the terms of a
|
|
.\" permission notice identical to this one.
|
|
.\"
|
|
.\" 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.\" manual page may be incorrect or out-of-date.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
|
|
.\" the use of the information contained herein. The author(s) may not
|
|
.\" have taken the same level of care in the production of this manual,
|
|
.\" which is licensed free of charge, as they might when working
|
|
.\" professionally.
|
|
.\"
|
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
.\" the source, must acknowledge the copyright and authors of this work.
|
|
.\" %%%LICENSE_END
|
|
.\"
|
|
.\" References consulted:
|
|
.\" Linux libc source code
|
|
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
|
|
.\" 386BSD man pages
|
|
.\" Modified Mon Apr 12 12:51:24 1993, David Metcalfe
|
|
.\" 2006-05-19, Justin Pryzby <pryzbyj@justinpryzby.com>
|
|
.\" Document strchrnul(3).
|
|
.\"
|
|
.TH STRCHR 3 2014-01-20 "GNU" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
strchr, strrchr, strchrnul \- locate character in string
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.B #include <string.h>
|
|
.sp
|
|
.BI "char *strchr(const char *" s ", int " c );
|
|
.sp
|
|
.BI "char *strrchr(const char *" s ", int " c );
|
|
.sp
|
|
.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
|
|
.B #include <string.h>
|
|
.sp
|
|
.BI "char *strchrnul(const char *" s ", int " c );
|
|
.fi
|
|
.SH DESCRIPTION
|
|
The
|
|
.BR strchr ()
|
|
function returns a pointer to the first occurrence
|
|
of the character
|
|
.I c
|
|
in the string
|
|
.IR s .
|
|
.PP
|
|
The
|
|
.BR strrchr ()
|
|
function returns a pointer to the last occurrence
|
|
of the character
|
|
.I c
|
|
in the string
|
|
.IR s .
|
|
.PP
|
|
The
|
|
.BR strchrnul ()
|
|
function is like
|
|
.BR strchr ()
|
|
except that if
|
|
.I c
|
|
is not found in
|
|
.IR s ,
|
|
then it returns a pointer to the null byte
|
|
at the end of
|
|
.IR s ,
|
|
rather than NULL.
|
|
.PP
|
|
Here "character" means "byte"; these functions do not work with
|
|
wide or multibyte characters.
|
|
.SH RETURN VALUE
|
|
The
|
|
.BR strchr ()
|
|
and
|
|
.BR strrchr ()
|
|
functions return a pointer to
|
|
the matched character or NULL if the character is not found.
|
|
The terminating null byte is considered part of the string,
|
|
so that if
|
|
.I c
|
|
is specified as \(aq\\0\(aq,
|
|
these functions return a pointer to the terminator.
|
|
|
|
The
|
|
.BR strchrnul ()
|
|
function returns a pointer to
|
|
the matched character,
|
|
or a pointer to the null
|
|
byte at the end of
|
|
.I s
|
|
(i.e.,
|
|
.IR "s+strlen(s)" )
|
|
if the character is not found.
|
|
.SH VERSIONS
|
|
.BR strchrnul ()
|
|
first appeared in glibc in version 2.1.1.
|
|
.SH ATTRIBUTES
|
|
For an explanation of the terms used in this section, see
|
|
.BR attributes (7).
|
|
.TS
|
|
allbox;
|
|
lbw32 lb lb
|
|
l l l.
|
|
Interface Attribute Value
|
|
T{
|
|
.BR strchr (),
|
|
.BR strrchr (),
|
|
.BR strchrnul ()
|
|
T} Thread safety MT-Safe
|
|
.TE
|
|
.SH CONFORMING TO
|
|
.BR strchr ()
|
|
and
|
|
.BR strrchr ()
|
|
are in SVr4, 4.3BSD, C89, C99.
|
|
.BR strchrnul ()
|
|
is a GNU extension.
|
|
.SH SEE ALSO
|
|
.BR index (3),
|
|
.BR memchr (3),
|
|
.BR rindex (3),
|
|
.BR string (3),
|
|
.BR strlen (3),
|
|
.BR strpbrk (3),
|
|
.BR strsep (3),
|
|
.BR strspn (3),
|
|
.BR strstr (3),
|
|
.BR strtok (3),
|
|
.BR wcschr (3),
|
|
.BR wcsrchr (3)
|