strchr, strrchr, strchrnul - locate character in string
#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);
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.
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.
strchrnul() first appeared in glibc in version 2.1.1.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| strchr (), strrchr (), strchrnul () |
Thread safety |
MT-Safe |
strchr(),
strrchr(): POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4,
4.3BSD.
strchrnul() is a GNU extension.
index(3),
memchr(3),
rindex(3),
string(3),
strlen(3),
strpbrk(3),
strsep(3),
strspn(3),
strstr(3),
strtok(3),
wcschr(3),
wcsrchr(3)