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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 aq\0aq, 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

This page is part of release 3.78 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 http://www.kernel.org/doc/man-pages/.

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