NAME

       index, rindex - locate character in string

SYNOPSIS

       #include <strings.h>

       char *index(const char *s, int c);

       char *rindex(const char *s, int c);

DESCRIPTION

       The  index()  function returns a pointer to the first occurrence of the character c in the
       string s.

       The rindex() function returns a pointer to the last occurrence of the character c  in  the
       string s.

       The terminating null byte ('\0') is considered to be a part of the strings.

RETURN VALUE

       The  index()  and  rindex() functions return a pointer to the matched character or NULL if
       the character is not found.

ATTRIBUTES

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

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

CONFORMING TO

       4.3BSD; marked as LEGACY in POSIX.1-2001.   POSIX.1-2008  removes  the  specifications  of
       index() and rindex(), recommending strchr(3) and strrchr(3) instead.

SEE ALSO

       memchr(3),  strchr(3), string(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3),
       strtok(3)

COLOPHON

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       found at https://www.kernel.org/doc/man-pages/.