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Note that strchrnul() first appeared in glibc 2.1.1 and appeared in
FreeBSD 10 before it appeared in NetBSD 8.

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.\"     from: @(#)strchr.3	8.2 (Berkeley) 4/19/94
.\"	$NetBSD: strchr.3,v 1.15 2023/01/31 01:42:32 simonb Exp $
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.Dd November 27, 2020
.Dt STRCHR 3
.Os
.Sh NAME
.Nm strchr, strchrnul
.Nd locate character in string
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft char *
.Fn strchr "const char *s" "int c"
.Ft char *
.Fn strchrnul "const char *s" "int c"
.Sh DESCRIPTION
The
.Fn strchr
and
.Fn strchrnul
functions locate the first occurrence of
.Ar c
in the string pointed to by
.Ar s .
The terminating
.Dv NUL
character is considered part of the string.
If
.Fa c
is
.Ql \e0 ,
.Fn strchr
and
.Fn strchrnul
locate the terminating
.Ql \e0 .
.Sh RETURN VALUES
The function
.Fn strchr
returns a pointer to the located character, or
.Dv NULL
if the character does not appear in the string.
The function
.Fn strchrnul
returns a pointer to the located character, or
a pointer to the
.Dv NUL
terminating character of the string if the character does not appear
in the string.
.Sh EXAMPLES
After the following call to
.Fn strchr ,
.Va p
will point to the string
.Qq oobar :
.Bd -literal -offset indent
char *p;
char *s = "foobar";

p = strchr(s, 'o');
.Ed
.Sh SEE ALSO
.Xr index 3 ,
.Xr memchr 3 ,
.Xr rindex 3 ,
.Xr strcspn 3 ,
.Xr strpbrk 3 ,
.Xr strrchr 3 ,
.Xr strsep 3 ,
.Xr strspn 3 ,
.Xr strstr 3 ,
.Xr strtok 3
.Sh STANDARDS
The
.Fn strchr
function
conforms to
.St -ansiC .
.Sh HISTORY
The
.Fn strchrnul
first appeared in glibc 2.1.1 and was added to
.Fx 10
and
.Nx 8 .