| INDEX(3) | Library Functions Manual | INDEX(3) | 
index —
#include <strings.h>
char *
  
  index(const
    char *s, int
  c);
index() function locates the first character
  matching c (converted to a char) in
  the nul-terminated string s.
This function is obsolete. The equivalent function strchr(3) should be used instead.
NULL is returned. If c is '\0',
  index() locates the terminating '\0'.
index() function conforms to IEEE
  Std 1003.1-2001 (“POSIX.1”). The IEEE
  Std 1003.1-2004 (“POSIX.1”) revision marked it as legacy
  and recommended the use of
  strchr(3) instead. The
  IEEE Std 1003.1-2008 (“POSIX.1”)
  revision removed index() from the specification.
index() function appeared in
  Version 6 AT&T UNIX.
| May 5, 2012 | NetBSD 9.4 |