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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 str-
     rchr(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 4.16 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 2015-03-02 INDEX(3)