index

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



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
       This page is part of release 5.04 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                               2019-03-06                          INDEX(3)