Manpages - 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).

*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)

This page is part of release 5.13 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 https://www.kernel.org/doc/man-pages/.