wmix/config.c

   1 /* WMix -- a mixer using the OSS mixer API.
   2  * Copyright (C) 2014 Christophe CURIS for the WindowMaker Team
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18 /*
  19  * config.c: functions related to loading the configuration, both from
  20  * command line options and from file
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <getopt.h>
  28
  29 #include <sys/soundcard.h>
  30
  31 #include "include/common.h"
  32 #include "include/config.h"
  33
  34
  35 #define HELP_TEXT         \
  36         "WMixer " VERSION " by timecop@japan.co.jp + skunk@mit.edu\n" \
  37         "usage:\n" \
  38         "  -d <dsp>  connect to remote X display\n" \
  39         "  -e <name> exclude channel, can be used many times\n" \
  40         "  -f <file> parse this config [~/.wmixrc]\n" \
  41         "  -h        print this help\n" \
  42         "  -m <dev>  mixer device [/dev/mixer]\n" \
  43         "  -v        verbose -> id, long name, name\n" \
  44
  45 /* The global configuration */
  46 struct _Config config;
  47
  48 /* Default color for OSD */
  49 const char default_osd_color[] = "green";
  50
  51
  52 /*
  53  * Sets the default values in configuration
  54  */
  55 void config_init(void)
  56 {
  57         memset(&config, 0, sizeof(config));
  58
  59         config.mousewheel = 1;
  60         config.scrolltext = 1;
  61         config.wheel_button_up = 4;
  62         config.wheel_button_down = 5;
  63         config.scrollstep = 0.03;
  64         config.osd = 1;
  65         config.osd_color = (char *) default_osd_color;
  66 }
  67
  68 /*
  69  * Parse Command-Line options
  70  *
  71  * Supposed to be called before reading config file, as there's an
  72  * option to change its name
  73  */
  74 void parse_cli_options(int argc, char **argv)
  75 {
  76         int opt;
  77         int count_exclude = 0;
  78         bool error_found;
  79
  80         opterr = 0;     /* We take charge of printing the error message */
  81         config.verbose = false;
  82         error_found = false;
  83         for (;;) {
  84                 opt = getopt(argc, argv, ":d:e:f:hm:v");
  85                 if (opt == -1)
  86                         break;
  87
  88                 switch (opt) {
  89                 case '?':
  90                         fprintf(stderr, "wmix:error: unknow option '-%c'\n", optopt);
  91                         error_found = true;
  92                         break;
  93
  94                 case ':':
  95                         fprintf(stderr, "wmix:error: missing argument for option '-%c'\n", optopt);
  96                         error_found = true;
  97                         break;
  98
  99                 case 'd':
 100                         config.display_name = strdup(optarg);
 101                         break;
 102
 103                 case 'e':
 104                         if (count_exclude < SOUND_MIXER_NRDEVICES) {
 105                                 config.exclude_channel[count_exclude] = strdup(optarg);
 106                                 count_exclude++;
 107                         } else
 108                                 fprintf(stderr, "Warning: You can't exclude this many channels\n");
 109                         break;
 110
 111                 case 'f':
 112                         if (config.file != NULL)
 113                                 free(config.file);
 114                         config.file = strdup(optarg);
 115                         break;
 116
 117                 case 'h':
 118                         fputs(HELP_TEXT, stdout);
 119                         exit(0);
 120                         break;
 121
 122                 case 'm':
 123                         config.mixer_device = strdup(optarg);
 124                         break;
 125
 126                 case 'v':
 127                         config.verbose = true;
 128                         break;
 129
 130                 default:
 131                         break;
 132                 }
 133         }
 134         config.exclude_channel[count_exclude] = NULL;
 135
 136         if (optind < argc) {
 137                 fprintf(stderr, "wmix:error: argument '%s' not understood\n", argv[optind]);
 138                 error_found = true;
 139         }
 140
 141         if (error_found)
 142                 exit(EXIT_FAILURE);
 143 }
 144
 145 /*
 146  * Read configuration from a file
 147  *
 148  * The file name is taken from CLI if available, of falls back to
 149  * a default name.
 150  */
 151 void config_read(void)
 152 {
 153         const char *filename;
 154         char buffer_fname[512];
 155         FILE *fp;
 156         int line;
 157         char buf[512];
 158
 159         if (config.file != NULL) {
 160                 filename = config.file;
 161         } else {
 162                 const char *home;
 163
 164                 home = getenv("HOME");
 165                 if (home == NULL) {
 166                         fprintf(stderr, "wmix: warning, could not get $HOME, can't load configuration file\n");
 167                         return;
 168                 }
 169                 snprintf(buffer_fname, sizeof(buffer_fname), "%s/.wmixrc", home);
 170                 filename = buffer_fname;
 171         }
 172
 173         fp = fopen(filename, "r");
 174         if (fp == NULL) {
 175                 if (config.file != NULL) {
 176                         /* The config file was explicitely specified by user, tell him there's a problem */
 177                         fprintf(stderr, "wmix: error, could not load configuration file \"%s\"\n", filename);
 178                         exit(EXIT_FAILURE);
 179                 }
 180                 /* Otherwise, it is acceptable if the file does not exist */
 181                 return;
 182         }
 183         if (config.verbose)
 184                 printf("Using configuration file: %s\n", filename);
 185
 186         line = 0;
 187         while (fgets(buf, 512, fp)) {
 188                 char *ptr;
 189                 char *keyword;
 190                 char *value;
 191
 192                 line++;
 193
 194                 ptr = buf;
 195                 while (isspace(*ptr))
 196                         ptr++;
 197
 198                 if ((*ptr == '\0') || (*ptr == '#'))
 199                         continue;
 200
 201                 /* Isolate the keyword */
 202                 keyword = ptr;
 203                 if (*ptr == '=') {
 204                         fprintf(stderr, "wmix:warning: syntax error at line %d in \"%s\", no keyword before '='\n",
 205                                 line, filename);
 206                         continue;
 207                 }
 208                 value = NULL;
 209                 while (*ptr) {
 210                         if (*ptr == '=') {
 211                                 value = ptr + 1;
 212                                 break;
 213                         }
 214                         if (*ptr == '#')
 215                                 break;
 216                         ptr++;
 217                 }
 218                 if (value == NULL) {
 219                         fprintf(stderr, "wmix:warning: syntax error at line %d in \"%s\", missing '='\n",
 220                                 line, filename);
 221                         continue;
 222                 }
 223                 while (isspace(ptr[-1]))
 224                         ptr--;
 225                 *ptr = '\0';
 226
 227                 /* Isolate the value */
 228                 while (isspace(*value))
 229                         value++;
 230                 ptr = value;
 231                 while (*ptr) {
 232                         if (*ptr == '#')
 233                                 break;
 234                         ptr++;
 235                 }
 236                 while (isspace(ptr[-1]))
 237                         ptr--;
 238                 *ptr = '\0';
 239
 240                 /* Check what keyword we have */
 241                 if (strcmp(keyword, "mousewheel") == 0) {
 242                         config.mousewheel = atoi(value);
 243
 244                 } else if (strcmp(keyword, "osd") == 0) {
 245                         config.osd = atoi(value);
 246
 247                 } else if (strcmp(keyword, "osdcolor") == 0) {
 248                         if (config.osd_color != default_osd_color)
 249                                 free(config.osd_color);
 250                         config.osd_color = strdup(value);
 251
 252                 } else if (strcmp(keyword, "scrolltext") == 0) {
 253                         config.scrolltext = atoi(value);
 254
 255                 } else if (strcmp(keyword, "wheelbtn1") == 0) {
 256                         config.wheel_button_up = atoi(value);
 257
 258                 } else if (strcmp(keyword, "wheelbtn2") == 0) {
 259                         config.wheel_button_down = atoi(value);
 260
 261                 } else if (strcmp(keyword, "wheelstep") == 0) {
 262                         double val;
 263
 264                         val = atof(value);
 265                         if (val < 0.0 || val > 100.0)
 266                                 fprintf(stderr, "wmix:error: value %f is out of range for wheelstep in %s at line %d\n",
 267                                         val, filename, line);
 268                         else if (val >= 1.0)
 269                                 config.scrollstep = val / 100.0;
 270                         else if (val > 0.0)
 271                                 config.scrollstep = val;
 272                         else
 273                                 fprintf(stderr, "wmix:error: value '%s' not understood for wheelstep in %s at line %d\n",
 274                                         value, filename, line);
 275                 } else {
 276                         fprintf(stderr, "wmix:warning: unknow keyword '%s' at line %d of \"%s\", ignored\n",
 277                                 keyword, line, filename);
 278                 }
 279         }
 280         fclose(fp);
 281 }