gdb/mi/mi-getopt.c

   1 /* MI Command Set - MI Option Parser.
   2    Copyright (C) 2000-2014 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 #include <string.h>
  23
  24 /* See comments about mi_getopt and mi_getopt_silent in mi-getopt.h.
  25    When there is an unknown option, if ERROR_ON_UNKNOWN is true,
  26    throw an error, otherwise return -1.  */
  27
  28 static int
  29 mi_getopt_1 (const char *prefix, int argc, char **argv,
  30              const struct mi_opt *opts, int *oind, char **oarg,
  31              int error_on_unknown)
  32 {
  33   char *arg;
  34   const struct mi_opt *opt;
  35
  36   /* We assume that argv/argc are ok.  */
  37   if (*oind > argc || *oind < 0)
  38     internal_error (__FILE__, __LINE__,
  39                     _("mi_getopt_long: oind out of bounds"));
  40   if (*oind == argc)
  41     return -1;
  42   arg = argv[*oind];
  43   /* ``--''? */
  44   if (strcmp (arg, "--") == 0)
  45     {
  46       *oind += 1;
  47       *oarg = NULL;
  48       return -1;
  49     }
  50   /* End of option list.  */
  51   if (arg[0] != '-')
  52     {
  53       *oarg = NULL;
  54       return -1;
  55     }
  56   /* Look the option up.  */
  57   for (opt = opts; opt->name != NULL; opt++)
  58     {
  59       if (strcmp (opt->name, arg + 1) != 0)
  60         continue;
  61       if (opt->arg_p)
  62         {
  63           /* A non-simple oarg option.  */
  64           if (argc < *oind + 2)
  65             error (_("%s: Option %s requires an argument"), prefix, arg);
  66           *oarg = argv[(*oind) + 1];
  67           *oind = (*oind) + 2;
  68           return opt->index;
  69         }
  70       else
  71         {
  72           *oarg = NULL;
  73           *oind = (*oind) + 1;
  74           return opt->index;
  75         }
  76     }
  77
  78   if (error_on_unknown)
  79     error (_("%s: Unknown option ``%s''"), prefix, arg + 1);
  80   else
  81     return -1;
  82 }
  83
  84 int
  85 mi_getopt (const char *prefix,
  86            int argc, char **argv,
  87            const struct mi_opt *opts,
  88            int *oind, char **oarg)
  89 {
  90   return mi_getopt_1 (prefix, argc, argv, opts, oind, oarg, 1);
  91 }
  92
  93 int
  94 mi_getopt_allow_unknown (const char *prefix, int argc, char **argv,
  95                          const struct mi_opt *opts, int *oind, char **oarg)
  96 {
  97   return mi_getopt_1 (prefix, argc, argv, opts, oind, oarg, 0);
  98 }
  99
 100 int
 101 mi_valid_noargs (const char *prefix, int argc, char **argv)
 102 {
 103   int oind = 0;
 104   char *oarg;
 105   static const struct mi_opt opts[] =
 106     {
 107       { 0, 0, 0 }
 108     };
 109
 110   if (mi_getopt (prefix, argc, argv, opts, &oind, &oarg) == -1)
 111     return 1;
 112   else
 113     return 0;
 114 }