index(3) — Linux manual page


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

NAME         top

       index, rindex - locate character in string

SYNOPSIS         top

       #include <strings.h>

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

DESCRIPTION         top

       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         top

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

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface                             Attribute     Value   │
       │index(), rindex()                     │ Thread safety │ MT-Safe │

CONFORMING TO         top

       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         top

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

COLOPHON         top

       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

GNU                            2021-03-22                       INDEX(3)

Pages that refer to this page: memchr(3)strchr(3)string(3)strpbrk(3)strsep(3)strspn(3)strstr(3)strtok(3)