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

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

       ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                                                             │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │strchr(), strrchr(), strchrnul()                                                                                                      │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       strchr(), strrchr(): POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.

       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)

GNU                                                                            2021-03-22                                                                      STRCHR(3)