STRCHR
Section: Linux Programmer's Manual (3)
Updated: 2019-03-06
Page Index
NAME
strchr, strrchr, strchrnul - locate character in string
SYNOPSIS
#include <string.h>
char *strchr(const char *s, int c);
char *strrchr(const char *s, int c);
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
char *strchrnul(const char *s, int c);
DESCRIPTION
The
strchr()
function returns a pointer to the first occurrence
of the character
c
in the string
s.
The
strrchr()
function returns a pointer to the last occurrence
of the character
c
in the string
s.
The
strchrnul()
function is like
strchr()
except that if
c
is not found in
s,
then it returns a pointer to the null byte
at the end of
s,
rather than NULL.
Here "character" means "byte"; these functions do not work with
wide or multibyte characters.
RETURN VALUE
The
strchr()
and
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
c
is specified as '\0',
these functions return a pointer to the terminator.
The
strchrnul()
function returns a pointer to the matched character,
or a pointer to the null byte at the end of
s
(i.e.,
s+strlen(s))
if the character is not found.
VERSIONS
strchrnul()
first appeared in glibc in version 2.1.1.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
strchr(),
strrchr(),
strchrnul()
| Thread safety | MT-Safe
|
CONFORMING TO
strchr(),
strrchr():
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
strchrnul()
is a GNU extension.
SEE ALSO
index(3),
memchr(3),
rindex(3),
string(3),
strlen(3),
strpbrk(3),
strsep(3),
strspn(3),
strstr(3),
strtok(3),
wcschr(3),
wcsrchr(3)
COLOPHON
This page is part of release 5.10 of the Linux
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/.