index(3) - f37

1INDEX(3)                   Linux Programmer's Manual                  INDEX(3)
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NAME

6       index, rindex - locate character in string
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SYNOPSIS

9       #include <strings.h>
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11       char *index(const char *s, int c);
12       char *rindex(const char *s, int c);
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DESCRIPTION

15       The  index()  function returns a pointer to the first occurrence of the
16       character c in the string s.
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18       The rindex() function returns a pointer to the last occurrence  of  the
19       character c in the string s.
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21       The  terminating  null  byte  ('\0')  is considered to be a part of the
22       strings.
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RETURN VALUE

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

29       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
30       tributes(7).
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32       ┌────────────────────────────────────────────┬───────────────┬─────────┐
33       │Interface                                   │ Attribute     │ Value   │
34       ├────────────────────────────────────────────┼───────────────┼─────────┤
35       │index(), rindex()                           │ Thread safety │ MT-Safe │
36       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

39       4.3BSD; marked as LEGACY in  POSIX.1-2001.   POSIX.1-2008  removes  the
40       specifications of index() and rindex(), recommending strchr(3) and str‐
41       rchr(3) instead.
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COLOPHON

48       This  page  is  part of release 5.13 of the Linux man-pages project.  A
49       description of the project, information about reporting bugs,  and  the
50       latest     version     of     this    page,    can    be    found    at
51       https://www.kernel.org/doc/man-pages/.
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55GNU                               2021-03-22                          INDEX(3)