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
  15 #include "ip_common.h"  /* #include "libbb.h" is inside */
  16 #include "utils.h"
  17
  18 family_t preferred_family = AF_UNSPEC;
  19 smallint oneline;
  20 char _SL_;
  21
  22 char** FAST_FUNC ip_parse_common_args(char **argv)
  23 {
  24         static const char ip_common_commands[] ALIGN1 =
  25                 "oneline" "\0"
  26                 "family" "\0"
  27                 "4" "\0"
  28                 "6" "\0"
  29                 "0" "\0"
  30                 ;
  31         enum {
  32                 ARG_oneline,
  33                 ARG_family,
  34                 ARG_IPv4,
  35                 ARG_IPv6,
  36                 ARG_packet,
  37         };
  38         static const family_t af_numbers[] = { AF_INET, AF_INET6, AF_PACKET };
  39         int arg;
  40
  41         while (*argv) {
  42                 char *opt = *argv;
  43
  44                 if (opt[0] != '-')
  45                         break;
  46                 opt++;
  47                 if (opt[0] == '-') {
  48                         opt++;
  49                         if (!opt[0]) { /* "--" */
  50                                 argv++;
  51                                 break;
  52                         }
  53                 }
  54                 arg = index_in_substrings(ip_common_commands, opt);
  55                 if (arg < 0)
  56                         bb_show_usage();
  57                 if (arg == ARG_oneline) {
  58                         oneline = 1;
  59                         argv++;
  60                         continue;
  61                 }
  62                 if (arg == ARG_family) {
  63                         static const char families[] ALIGN1 =
  64                                 "inet" "\0" "inet6" "\0" "link" "\0";
  65                         argv++;
  66                         if (!*argv)
  67                                 bb_show_usage();
  68                         arg = index_in_strings(families, *argv);
  69                         if (arg < 0)
  70                                 invarg(*argv, "protocol family");
  71                         /* now arg == 0, 1 or 2 */
  72                 } else {
  73                         arg -= ARG_IPv4;
  74                         /* now arg == 0, 1 or 2 */
  75                 }
  76                 preferred_family = af_numbers[arg];
  77                 argv++;
  78         }
  79         _SL_ = oneline ? '\\' : '\n';
  80         return argv;
  81 }