networking/libiproute/ip_parse_common_args.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License
   5  * as published by the Free Software Foundation; either version
   6  * 2 of the License, or (at your option) any later version.
   7  *
   8  * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  * Changes:
  11  *
  12  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  13  */
  14 #include "ip_common.h"  /* #include "libbb.h" is inside */
  15 #include "utils.h"
  16
  17 family_t preferred_family = AF_UNSPEC;
  18 smallint oneline;
  19 char _SL_;
  20
  21 char** FAST_FUNC ip_parse_common_args(char **argv)
  22 {
  23         static const char ip_common_commands[] ALIGN1 =
  24                 "oneline" "\0"
  25                 "family" "\0"
  26                 "4" "\0"
  27                 "6" "\0"
  28                 "0" "\0"
  29                 ;
  30         enum {
  31                 ARG_oneline,
  32                 ARG_family,
  33                 ARG_IPv4,
  34                 ARG_IPv6,
  35                 ARG_packet,
  36         };
  37         static const family_t af_numbers[] = { AF_INET, AF_INET6, AF_PACKET };
  38         int arg;
  39
  40         while (*argv) {
  41                 char *opt = *argv;
  42
  43                 if (opt[0] != '-')
  44                         break;
  45                 opt++;
  46                 if (opt[0] == '-') {
  47                         opt++;
  48                         if (!opt[0]) { /* "--" */
  49                                 argv++;
  50                                 break;
  51                         }
  52                 }
  53                 arg = index_in_substrings(ip_common_commands, opt);
  54                 if (arg < 0)
  55                         bb_show_usage();
  56                 if (arg == ARG_oneline) {
  57                         oneline = 1;
  58                         argv++;
  59                         continue;
  60                 }
  61                 if (arg == ARG_family) {
  62                         static const char families[] ALIGN1 =
  63                                 "inet" "\0" "inet6" "\0" "link" "\0";
  64                         argv++;
  65                         if (!*argv)
  66                                 bb_show_usage();
  67                         arg = index_in_strings(families, *argv);
  68                         if (arg < 0)
  69                                 invarg_1_to_2(*argv, "family");
  70                         /* now arg == 0, 1 or 2 */
  71                 } else {
  72                         arg -= ARG_IPv4;
  73                         /* now arg == 0, 1 or 2 */
  74                 }
  75                 preferred_family = af_numbers[arg];
  76                 argv++;
  77         }
  78         _SL_ = oneline ? '\\' : '\n';
  79         return argv;
  80 }