gdb/mi/mi-getopt.c

   1 /* MI Command Set - MI Option Parser.
   2    Copyright (C) 2000-2017 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions (a Red Hat company).
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "mi-getopt.h"
  22 /* See comments about mi_getopt and mi_getopt_silent in mi-getopt.h.
  23    When there is an unknown option, if ERROR_ON_UNKNOWN is true,
  24    throw an error, otherwise return -1.  */
  25
  26 static int
  27 mi_getopt_1 (const char *prefix, int argc, char **argv,
  28              const struct mi_opt *opts, int *oind, char **oarg,
  29              int error_on_unknown)
  30 {
  31   char *arg;
  32   const struct mi_opt *opt;
  33
  34   /* We assume that argv/argc are ok.  */
  35   if (*oind > argc || *oind < 0)
  36     internal_error (__FILE__, __LINE__,
  37                     _("mi_getopt_long: oind out of bounds"));
  38   if (*oind == argc)
  39     return -1;
  40   arg = argv[*oind];
  41   /* ``--''? */
  42   if (strcmp (arg, "--") == 0)
  43     {
  44       *oind += 1;
  45       *oarg = NULL;
  46       return -1;
  47     }
  48   /* End of option list.  */
  49   if (arg[0] != '-')
  50     {
  51       *oarg = NULL;
  52       return -1;
  53     }
  54   /* Look the option up.  */
  55   for (opt = opts; opt->name != NULL; opt++)
  56     {
  57       if (strcmp (opt->name, arg + 1) != 0)
  58         continue;
  59       if (opt->arg_p)
  60         {
  61           /* A non-simple oarg option.  */
  62           if (argc < *oind + 2)
  63             error (_("%s: Option %s requires an argument"), prefix, arg);
  64           *oarg = argv[(*oind) + 1];
  65           *oind = (*oind) + 2;
  66           return opt->index;
  67         }
  68       else
  69         {
  70           *oarg = NULL;
  71           *oind = (*oind) + 1;
  72           return opt->index;
  73         }
  74     }
  75
  76   if (error_on_unknown)
  77     error (_("%s: Unknown option ``%s''"), prefix, arg + 1);
  78   else
  79     return -1;
  80 }
  81
  82 int
  83 mi_getopt (const char *prefix,
  84            int argc, char **argv,
  85            const struct mi_opt *opts,
  86            int *oind, char **oarg)
  87 {
  88   return mi_getopt_1 (prefix, argc, argv, opts, oind, oarg, 1);
  89 }
  90
  91 int
  92 mi_getopt_allow_unknown (const char *prefix, int argc, char **argv,
  93                          const struct mi_opt *opts, int *oind, char **oarg)
  94 {
  95   return mi_getopt_1 (prefix, argc, argv, opts, oind, oarg, 0);
  96 }
  97
  98 int
  99 mi_valid_noargs (const char *prefix, int argc, char **argv)
 100 {
 101   int oind = 0;
 102   char *oarg;
 103   static const struct mi_opt opts[] =
 104     {
 105       { 0, 0, 0 }
 106     };
 107
 108   if (mi_getopt (prefix, argc, argv, opts, &oind, &oarg) == -1)
 109     return 1;
 110   else
 111     return 0;
 112 }