strchr(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON

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

NAME         top

       strchr, strrchr, strchrnul - locate character in string

SYNOPSIS         top

       #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         top

       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         top

       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         top

       strchrnul() first appeared in glibc in version 2.1.1.

ATTRIBUTES         top

       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         top

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

       strchrnul() is a GNU extension.

SEE ALSO         top

       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         top

       This page is part of release 5.11 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/.

GNU                            2021-03-22                      STRCHR(3)

Pages that refer to this page: index(3)memchr(3)string(3)strpbrk(3)strsep(3)strspn(3)strstr(3)strtok(3)wcschr(3)wcsrchr(3)signal-safety(7)