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¶

Multithreading (see pthreads(7))¶

The strchr(), strrchr(), and strchrnul() functions are thread-safe.

CONFORMING TO¶

strchr() and strrchr() are in SVr4, 4.3BSD, C89, C99. 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¶

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