diffutils/lib/getopt.c

2    NOTE: getopt is now part of the C library, so if you don't know what
24 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
67    contain conflicting prototypes for getopt.  */
91 /* This version of `getopt' appears to the caller like standard Unix `getopt'
95    As `getopt' works, it permutes the elements of ARGV so that,
105 #include "getopt.h"
107 /* For communication from `getopt' to the caller.
108    When `getopt' finds an option that takes an argument,
117    and for communication between successive calls to `getopt'.
119    On entry to `getopt', zero means this is the first call; initialize.
121    When `getopt' returns -1, this is the index of the first of the
130 /* Formerly, initialization of getopt depended on optind==0, which
131    causes problems with re-calling getopt as programs generally don't
152    system's own getopt implementation.  */
183    `--' can cause `getopt' to return -1 with `optind' != ARGC.  */
270    is valid for the getopt call we must make sure that the ARGV passed
271    to getopt is that one passed to the process.  */
470    (aside from the initial '-') are option characters.  If `getopt'
474    If `getopt' finds another option character, it returns that character,
475    updating `optind' and `nextchar' so that the next call to `getopt' can
478    If there are no more option characters, `getopt' returns -1.
503    When `getopt' finds a long-named option, it returns 0 if that option's
988 getopt (argc, argv, optstring)
1005    the above definition of `getopt'.  */
1019       c = getopt (argc, argv, "abc:d:0123456789");
1057 	  printf ("?? getopt returned character code 0%o ??\n", c);