strchrnul(3)

NAME#

strchr, strrchr, strchrnul - locate character in string

LIBRARY#

Standard C library (libc, -lc)

SYNOPSIS#

#include <string.h>

char *strchr(const char *\ns\n, int \nc\n);\n
\nchar *strrchr(const char *\ns\n, int \nc\n);

#define _GNU_SOURCE\n         /* See feature_test_macros(7) */
\n#include <string.h>

char *strchrnul(const char *\ns\n, int \nc\n);

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.

ATTRIBUTES#

For an explanation of the terms used in this section, see attributes(7).

STANDARDS#

strchr()

strrchr()

C11, POSIX.1-2008.

strchrnul()

GNU.

HISTORY#

strchr()

strrchr()

POSIX.1-2001, C89, SVr4, 4.3BSD.

strchrnul()

glibc 2.1.1, FreeBSD 10, NetBSD 8.

SEE ALSO#

memchr(3), string(3), strlen(3), strpbrk(3), strsep(3), strspn(3), strstr(3), strtok(3), wcschr(3), wcsrchr(3)