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STRCHR(3) Linux Programmer's Manual STRCHR(3)

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)

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2019-03-06 GNU