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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)