NAME¶

strchr, strrchr, strchrnul - locate character in string

LIBRARY¶

Standard C library (libc, -lc)

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() was added in glibc 2.1.1.

ATTRIBUTES¶

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

STANDARDS¶

strchr(), strrchr(): POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD.

strchrnul() is a GNU extension.

SEE ALSO¶

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