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[thirdparty/man-pages.git] / man3 / strchr.3

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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 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 (date) "Linux man-pages (unreleased)"
-.SH NAME
-strchr, strrchr, strchrnul \- locate character in string
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <string.h>
-.P
-.BI "char *strchr(const char *" s ", int " c );
-.BI "char *strrchr(const char *" s ", int " c );
-.P
-.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
-.B #include <string.h>
-.P
-.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 .
-.P
-The
-.BR strrchr ()
-function returns a pointer to the last occurrence
-of the character
-.I c
-in the string
-.IR s .
-.P
-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.
-.P
-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]\e0\[aq],
-these functions return a pointer to the terminator.
-.P
-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 ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.na
-.nh
-.BR strchr (),
-.BR strrchr (),
-.BR strchrnul ()
-T}     Thread safety   MT-Safe
-.TE
-.SH STANDARDS
-.TP
-.BR strchr ()
-.TQ
-.BR strrchr ()
-C11, POSIX.1-2008.
-.TP
-.BR strchrnul ()
-GNU.
-.SH HISTORY
-.TP
-.BR strchr ()
-.TQ
-.BR strrchr ()
-POSIX.1-2001, C89, SVr4, 4.3BSD.
-.TP
-.BR strchrnul ()
-glibc 2.1.1,
-FreeBSD 10,
-NetBSD 8.
-.SH SEE ALSO
-.BR memchr (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)