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
  49 /*
  50  * Sets the default values in configuration
  51  */
  52 void config_init(void)
  53 {
  54         memset(&config, 0, sizeof(config));
  55
  56         config.mousewheel = 1;
  57         config.scrolltext = 1;
  58         config.wheel_button_up = 4;
  59         config.wheel_button_down = 5;
  60         config.scrollstep = 0.03;
  61         config.osd = 1;
  62         config.osd_color = strdup("green");
  63 }
  64
  65 /*
  66  * Parse Command-Line options
  67  *
  68  * Supposed to be called before reading config file, as there's an
  69  * option to change its name
  70  */
  71 void parse_cli_options(int argc, char **argv)
  72 {
  73         int opt;
  74         int count_exclude = 0;
  75         bool error_found;
  76
  77         opterr = 0;     /* We take charge of printing the error message */
  78         config.verbose = false;
  79         error_found = false;
  80         for (;;) {
  81                 opt = getopt(argc, argv, ":d:e:f:hm:v");
  82                 if (opt == -1)
  83                         break;
  84
  85                 switch (opt) {
  86                 case '?':
  87                         fprintf(stderr, "wmix:error: unknow option '-%c'\n", optopt);
  88                         error_found = true;
  89                         break;
  90
  91                 case ':':
  92                         fprintf(stderr, "wmix:error: missing argument for option '-%c'\n", optopt);
  93                         error_found = true;
  94                         break;
  95
  96                 case 'd':
  97                         config.display_name = strdup(optarg);
  98                         break;
  99
 100                 case 'e':
 101                         if (count_exclude < SOUND_MIXER_NRDEVICES) {
 102                                 config.exclude_channel[count_exclude] = strdup(optarg);
 103                                 count_exclude++;
 104                         } else
 105                                 fprintf(stderr, "Warning: You can't exclude this many channels\n");
 106                         break;
 107
 108                 case 'f':
 109                         if (config.file != NULL)
 110                                 free(config.file);
 111                         config.file = strdup(optarg);
 112                         break;
 113
 114                 case 'h':
 115                         fputs(HELP_TEXT, stdout);
 116                         exit(0);
 117                         break;
 118
 119                 case 'm':
 120                         config.mixer_device = strdup(optarg);
 121                         break;
 122
 123                 case 'v':
 124                         config.verbose = true;
 125                         break;
 126
 127                 default:
 128                         break;
 129                 }
 130         }
 131         config.exclude_channel[count_exclude] = NULL;
 132
 133         if (optind < argc) {
 134                 fprintf(stderr, "wmix:error: argument '%s' not understood\n", argv[optind]);
 135                 error_found = true;
 136         }
 137
 138         if (error_found)
 139                 exit(EXIT_FAILURE);
 140 }
 141
 142 /*
 143  * Read configuration from a file
 144  *
 145  * The file name is taken from CLI if available, of falls back to
 146  * a default name.
 147  */
 148 void config_read(void)
 149 {
 150         const char *filename;
 151         char buffer_fname[512];
 152         FILE *fp;
 153         int line;
 154         char buf[512];
 155
 156         if (config.file != NULL) {
 157                 filename = config.file;
 158         } else {
 159                 const char *home;
 160
 161                 home = getenv("HOME");
 162                 if (home == NULL) {
 163                         fprintf(stderr, "wmix: warning, could not get $HOME, can't load configuration file\n");
 164                         return;
 165                 }
 166                 snprintf(buffer_fname, sizeof(buffer_fname), "%s/.wmixrc", home);
 167                 filename = buffer_fname;
 168         }
 169
 170         fp = fopen(filename, "r");
 171         if (fp == NULL) {
 172                 if (config.file != NULL) {
 173                         /* The config file was explicitely specified by user, tell him there's a problem */
 174                         fprintf(stderr, "wmix: error, could not load configuration file \"%s\"\n", filename);
 175                         exit(EXIT_FAILURE);
 176                 }
 177                 /* Otherwise, it is acceptable if the file does not exist */
 178                 return;
 179         }
 180         if (config.verbose)
 181                 printf("Using configuration file: %s\n", filename);
 182
 183         line = 0;
 184         while (fgets(buf, 512, fp)) {
 185                 char *ptr;
 186                 char *keyword;
 187                 char *value;
 188
 189                 line++;
 190
 191                 ptr = buf;
 192                 while (isspace(*ptr))
 193                         ptr++;
 194
 195                 if ((*ptr == '\0') || (*ptr == '#'))
 196                         continue;
 197
 198                 /* Isolate the keyword */
 199                 keyword = ptr;
 200                 if (*ptr == '=') {
 201                         fprintf(stderr, "wmix:warning: syntax error at line %d in \"%s\", no keyword before '='\n",
 202                                 line, filename);
 203                         continue;
 204                 }
 205                 value = NULL;
 206                 while (*ptr) {
 207                         if (*ptr == '=') {
 208                                 value = ptr + 1;
 209                                 break;
 210                         }
 211                         if (*ptr == '#')
 212                                 break;
 213                         ptr++;
 214                 }
 215                 if (value == NULL) {
 216                         fprintf(stderr, "wmix:warning: syntax error at line %d in \"%s\", missing '='\n",
 217                                 line, filename);
 218                         continue;
 219                 }
 220                 while (isspace(ptr[-1]))
 221                         ptr--;
 222                 *ptr = '\0';
 223
 224                 /* Isolate the value */
 225                 while (isspace(*value))
 226                         value++;
 227                 ptr = value;
 228                 while (*ptr) {
 229                         if (*ptr == '#')
 230                                 break;
 231                         ptr++;
 232                 }
 233                 while (isspace(ptr[-1]))
 234                         ptr--;
 235                 *ptr = '\0';
 236
 237                 /* Check what keyword we have */
 238                 if (strcmp(keyword, "mousewheel") == 0) {
 239                         config.mousewheel = atoi(value);
 240
 241                 } else if (strcmp(keyword, "osd") == 0) {
 242                         config.osd = atoi(value);
 243
 244                 } else if (strcmp(keyword, "osdcolor") == 0) {
 245                         if (config.osd_color)
 246                                 free(config.osd_color);
 247                         config.osd_color = strdup(value);
 248
 249                 } else if (strcmp(keyword, "scrolltext") == 0) {
 250                         config.scrolltext = atoi(value);
 251
 252                 } else if (strcmp(keyword, "wheelbtn1") == 0) {
 253                         config.wheel_button_up = atoi(value);
 254
 255                 } else if (strcmp(keyword, "wheelbtn2") == 0) {
 256                         config.wheel_button_down = atoi(value);
 257
 258                 } else if (strcmp(keyword, "wheelstep") == 0) {
 259                         double val;
 260
 261                         val = atof(value);
 262                         if (val < 0.0 || val > 100.0)
 263                                 fprintf(stderr, "wmix:error: value %f is out of range for wheelstep in %s at line %d\n",
 264                                         val, filename, line);
 265                         else if (val >= 1.0)
 266                                 config.scrollstep = val / 100.0;
 267                         else if (val > 0.0)
 268                                 config.scrollstep = val;
 269                         else
 270                                 fprintf(stderr, "wmix:error: value '%s' not understood for wheelstep in %s at line %d\n",
 271                                         value, filename, line);
 272                 } else {
 273                         fprintf(stderr, "wmix:warning: unknow keyword '%s' at line %d of \"%s\", ignored\n",
 274                                 keyword, line, filename);
 275                 }
 276         }
 277         fclose(fp);
 278 }