jack/driver_parse.h

   1 /* -*- mode: c; c-file-style: "linux"; -*- */
   2 /*
   3   Copyright (C) 2003 Bob Ham <rah@bash.sh
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9
  10   This program is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program; if not, write to the Free Software
  17   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #ifndef __jack_driver_parse_h__
  22 #define __jack_driver_parse_h__
  23
  24 #include <jack/jslist.h>
  25 #include <jack/driver_interface.h>
  26
  27 static void
  28 jack_print_driver_options (jack_driver_desc_t * desc, FILE *file)
  29 {
  30         unsigned long i;
  31         char arg_default[JACK_DRIVER_PARAM_STRING_MAX + 1];
  32
  33         for (i = 0; i < desc->nparams; i++) {
  34                 switch (desc->params[i].type) {
  35                 case JackDriverParamInt:
  36                         sprintf (arg_default, "%" PRId32, desc->params[i].value.i);
  37                         break;
  38                 case JackDriverParamUInt:
  39                         sprintf (arg_default, "%" PRIu32, desc->params[i].value.ui);
  40                         break;
  41                 case JackDriverParamChar:
  42                         sprintf (arg_default, "%c", desc->params[i].value.c);
  43                         break;
  44                 case JackDriverParamString:
  45                         if (desc->params[i].value.str &&
  46                             strcmp (desc->params[i].value.str, "") != 0)
  47                                 sprintf (arg_default, "%s", desc->params[i].value.str);
  48                         else
  49                                 sprintf (arg_default, "none");
  50                         break;
  51                 case JackDriverParamBool:
  52                         sprintf (arg_default, "%s", desc->params[i].value.i ? "true" : "false");
  53                         break;
  54                 }
  55
  56                 fprintf (file, "\t-%c, --%s \t%s (default: %s)\n",
  57                          desc->params[i].character,
  58                          desc->params[i].name,
  59                          desc->params[i].short_desc,
  60                          arg_default);
  61         }
  62 }
  63
  64 static void
  65 jack_print_driver_param_usage (jack_driver_desc_t * desc, unsigned long param, FILE *file)
  66 {
  67         fprintf (file, "Usage information for the '%s' parameter for driver '%s':\n",
  68                  desc->params[param].name, desc->name);
  69
  70         fprintf (file, "%s\n", desc->params[param].long_desc);
  71 }
  72
  73
  74 static int
  75 jack_parse_driver_params (jack_driver_desc_t * desc, int argc, char **argv, JSList ** param_ptr)
  76 {
  77         struct option * long_options;
  78         char * options, * options_ptr;
  79         unsigned long i;
  80         int opt, param_index;
  81         JSList * params = NULL;
  82         jack_driver_param_t * driver_param;
  83
  84         if (argc <= 1) {
  85                 *param_ptr = NULL;
  86                 return 0;
  87         }
  88
  89         /* check for help */
  90         if (strcmp (argv[1], "-h") == 0 || strcmp (argv[1], "--help") == 0) {
  91                 if (argc > 2) {
  92                         for (i = 0; i < desc->nparams; i++) {
  93                                 if (strcmp (desc->params[i].name, argv[2]) == 0) {
  94                                         jack_print_driver_param_usage (desc, i, stdout);
  95                                         return 1;
  96                                 }
  97                         }
  98
  99                         fprintf (stderr, "jackd: unknown option '%s' "
 100                                  "for driver '%s'\n", argv[2],
 101                                  desc->name);
 102                 }
 103
 104                 printf ("Parameters for driver '%s' (all parameters are optional):\n", desc->name);
 105                 jack_print_driver_options (desc, stdout);
 106                 return 1;
 107         }
 108
 109
 110         /* set up the stuff for getopt */
 111         options = calloc (desc->nparams*3 + 1, sizeof (char));
 112         long_options = calloc (desc->nparams + 1, sizeof (struct option));
 113
 114         options_ptr = options;
 115         for (i = 0; i < desc->nparams; i++) {
 116                 sprintf (options_ptr, "%c::", desc->params[i].character);
 117                 options_ptr += 3;
 118
 119                 long_options[i].name    = desc->params[i].name;
 120                 long_options[i].flag    = NULL;
 121                 long_options[i].val     = desc->params[i].character;
 122                 long_options[i].has_arg = optional_argument;
 123         }
 124
 125         /* create the params */
 126         optind = 0;
 127         opterr = 0;
 128         while ((opt = getopt_long(argc, argv, options, long_options, NULL)) != -1) {
 129
 130                 if (opt == ':' || opt == '?') {
 131                         if (opt == ':') {
 132                                 fprintf (stderr, "Missing option to argument '%c'\n", optopt);
 133                         } else {
 134                                 fprintf (stderr, "Unknownage with option '%c'\n", optopt);
 135                         }
 136
 137                         fprintf (stderr, "Options for driver '%s':\n", desc->name);
 138                         jack_print_driver_options (desc, stderr);
 139                         exit (1);
 140                 }
 141
 142                 for (param_index = 0; param_index < desc->nparams; param_index++) {
 143                         if (opt == desc->params[param_index].character) {
 144                                 break;
 145                         }
 146                 }
 147
 148                 driver_param = calloc (1, sizeof (jack_driver_param_t));
 149
 150                 driver_param->character = desc->params[param_index].character;
 151
 152                 if (!optarg && optind < argc &&
 153                     strlen(argv[optind]) &&
 154                     argv[optind][0] != '-') {
 155                         optarg = argv[optind];
 156                 }
 157
 158                 if (optarg) {
 159                         switch (desc->params[param_index].type) {
 160                         case JackDriverParamInt:
 161                                 driver_param->value.i = atoi (optarg);
 162                                 break;
 163                         case JackDriverParamUInt:
 164                                 driver_param->value.ui = strtoul (optarg, NULL, 10);
 165                                 break;
 166                         case JackDriverParamChar:
 167                                 driver_param->value.c = optarg[0];
 168                                 break;
 169                         case JackDriverParamString:
 170                                 strncpy (driver_param->value.str, optarg, JACK_DRIVER_PARAM_STRING_MAX);
 171                                 break;
 172                         case JackDriverParamBool:
 173
 174                                 if (strcasecmp ("false",  optarg) == 0 ||
 175                                     strcasecmp ("off",    optarg) == 0 ||
 176                                     strcasecmp ("no",     optarg) == 0 ||
 177                                     strcasecmp ("0",      optarg) == 0 ||
 178                                     strcasecmp ("(null)", optarg) == 0   ) {
 179
 180                                         driver_param->value.i = FALSE;
 181
 182                                 } else {
 183
 184                                         driver_param->value.i = TRUE;
 185
 186                                 }
 187                                 break;
 188                         }
 189                 } else {
 190                         if (desc->params[param_index].type == JackDriverParamBool) {
 191                                 driver_param->value.i = TRUE;
 192                         } else {
 193                                 driver_param->value = desc->params[param_index].value;
 194                         }
 195                 }
 196
 197                 params = jack_slist_append (params, driver_param);
 198         }
 199
 200         free (options);
 201         free (long_options);
 202
 203         if (param_ptr)
 204                 *param_ptr = params;
 205
 206         return 0;
 207 }
 208
 209
 210 #endif /* __jack_driver_parse_h__ */
 211
 212