networking/libiproute/ip_parse_common_args.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * ip.c         "ip" utility frontend.
   4  *
   5  *              This program is free software; you can redistribute it and/or
   6  *              modify it under the terms of the GNU General Public License
   7  *              as published by the Free Software Foundation; either version
   8  *              2 of the License, or (at your option) any later version.
   9  *
  10  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  11  *
  12  *
  13  * Changes:
  14  *
  15  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  16  */
  17
  18 #include "ip_common.h"  /* #include "libbb.h" is inside */
  19 #include "utils.h"
  20
  21 family_t preferred_family = AF_UNSPEC;
  22 smallint oneline;
  23 char _SL_;
  24
  25 char **ip_parse_common_args(char **argv)
  26 {
  27         static const char ip_common_commands[] ALIGN1 =
  28                 "oneline" "\0"
  29                 "family" "\0"
  30                 "4" "\0"
  31                 "6" "\0"
  32                 "0" "\0"
  33                 ;
  34         enum {
  35                 ARG_oneline,
  36                 ARG_family,
  37                 ARG_IPv4,
  38                 ARG_IPv6,
  39                 ARG_packet,
  40         };
  41         static const family_t af_numbers[] = { AF_INET, AF_INET6, AF_PACKET };
  42         int arg;
  43
  44         while (*argv) {
  45                 char *opt = *argv;
  46
  47                 if (opt[0] != '-')
  48                         break;
  49                 opt++;
  50                 if (opt[0] == '-') {
  51                         opt++;
  52                         if (!opt[0]) { /* "--" */
  53                                 argv++;
  54                                 break;
  55                         }
  56                 }
  57                 arg = index_in_strings(ip_common_commands, opt);
  58                 if (arg < 0)
  59                         bb_show_usage();
  60                 if (arg == ARG_oneline) {
  61                         oneline = 1;
  62                         argv++;
  63                         continue;
  64                 }
  65                 if (arg == ARG_family) {
  66                         static const char families[] ALIGN1 =
  67                                 "inet" "\0" "inet6" "\0" "link" "\0";
  68                         argv++;
  69                         if (!*argv)
  70                                 bb_show_usage();
  71                         arg = index_in_strings(families, *argv);
  72                         if (arg < 0)
  73                                 invarg(*argv, "protocol family");
  74                         /* now arg == 0, 1 or 2 */
  75                 } else {
  76                         arg -= ARG_IPv4;
  77                         /* now arg == 0, 1 or 2 */
  78                 }
  79                 preferred_family = af_numbers[arg];
  80                 argv++;
  81         }
  82         _SL_ = oneline ? '\\' : '\n';
  83         return argv;
  84 }