games/morse/morse.c

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)morse.c  8.1 (Berkeley) 5/31/93
  35  * $FreeBSD: src/games/morse/morse.c,v 1.12.2.2 2002/03/12 17:45:15 phantom Exp $
  36  * $DragonFly: src/games/morse/morse.c,v 1.8 2008/05/30 21:47:04 corecode Exp $
  37  */
  38
  39 /*
  40  * Taught to send *real* morse by Lyndon Nerenberg (VE7TCP/VE6BBM)
  41  * <lyndon@orthanc.com>
  42  */
  43
  44 #include <sys/time.h>
  45 #include <sys/soundcard.h>
  46
  47 #include <ctype.h>
  48 #include <err.h>
  49 #include <fcntl.h>
  50 #include <langinfo.h>
  51 #include <locale.h>
  52 #include <math.h>
  53 #include <signal.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <termios.h>
  58 #include <unistd.h>
  59
  60 struct morsetab {
  61         char            inchar;
  62         const char      *morse;
  63 };
  64
  65 static const struct morsetab mtab[] = {
  66
  67         /* letters */
  68
  69         {'a', ".-"},
  70         {'b', "-..."},
  71         {'c', "-.-."},
  72         {'d', "-.."},
  73         {'e', "."},
  74         {'f', "..-."},
  75         {'g', "--."},
  76         {'h', "...."},
  77         {'i', ".."},
  78         {'j', ".---"},
  79         {'k', "-.-"},
  80         {'l', ".-.."},
  81         {'m', "--"},
  82         {'n', "-."},
  83         {'o', "---"},
  84         {'p', ".--."},
  85         {'q', "--.-"},
  86         {'r', ".-."},
  87         {'s', "..."},
  88         {'t', "-"},
  89         {'u', "..-"},
  90         {'v', "...-"},
  91         {'w', ".--"},
  92         {'x', "-..-"},
  93         {'y', "-.--"},
  94         {'z', "--.."},
  95
  96         /* digits */
  97
  98         {'0', "-----"},
  99         {'1', ".----"},
 100         {'2', "..---"},
 101         {'3', "...--"},
 102         {'4', "....-"},
 103         {'5', "....."},
 104         {'6', "-...."},
 105         {'7', "--..."},
 106         {'8', "---.."},
 107         {'9', "----."},
 108
 109         /* punctuation */
 110
 111         {',', "--..--"},
 112         {'.', ".-.-.-"},
 113         {'?', "..--.."},
 114         {'!', "-.-.--"},        /* KW */
 115         {'/', "-..-."},
 116         {'-', "-....-"},
 117         {'_', "..--.."},
 118         {'=', "-...-"},         /* BT */
 119         {':', "---..."},
 120         {';', "-.-.-."},
 121         {'(', "-.--."},         /* KN */
 122         {')', "-.--.-"},
 123         {'$', "...-..-"},
 124         {'+', ".-.-."},         /* AR */
 125         {'\'', ".----."},
 126         {'"', ".-..-."},
 127         {'@', ".--.-."},        /* AC */
 128
 129         {'\0', ""}
 130 };
 131
 132
 133 static const struct morsetab iso8859tab[] = {
 134         {'á', ".--.-"},
 135         {'à', ".--.-"},
 136         {'â', ".--.-"},
 137         {'ä', ".-.-"},
 138         {'ç', "-.-.."},
 139         {'é', "..-.."},
 140         {'è', "..-.."},
 141         {'ê', "-..-."},
 142         {'ö', "---."},
 143         {'ü', "..--"},
 144
 145         {'\0', ""}
 146 };
 147
 148 static const struct morsetab koi8rtab[] = {
 149         /*
 150          * the cyrillic alphabet; you'll need a KOI8R font in order
 151          * to see the actual characters
 152          */
 153         {'Á', ".-"},            /* a */
 154         {'Â', "-..."},  /* be */
 155         {'×', ".--"},   /* ve */
 156         {'Ç', "--."},   /* ge */
 157         {'Ä', "-.."},   /* de */
 158         {'Å', "."},             /* ye */
 159         {'£', "."},             /* yo, the same as ye */
 160         {'Ö', "...-"},  /* she */
 161         {'Ú', "--.."},  /* ze */
 162         {'É', ".."},            /* i */
 163         {'Ê', ".---"},  /* i kratkoye */
 164         {'Ë', "-.-"},   /* ka */
 165         {'Ì', ".-.."},  /* el */
 166         {'Í', "--"},            /* em */
 167         {'Î', "-."},            /* en */
 168         {'Ï', "---"},   /* o */
 169         {'Ð', ".--."},  /* pe */
 170         {'Ò', ".-."},   /* er */
 171         {'Ó', "..."},   /* es */
 172         {'Ô', "-"},             /* te */
 173         {'Õ', "..-"},   /* u */
 174         {'Æ', "..-."},  /* ef */
 175         {'È', "...."},  /* kha */
 176         {'Ã', "-.-."},  /* ce */
 177         {'Þ', "---."},  /* che */
 178         {'Û', "----"},  /* sha */
 179         {'Ý', "--.-"},  /* shcha */
 180         {'Ù', "-.--"},  /* yi */
 181         {'Ø', "-..-"},  /* myakhkij znak */
 182         {'Ü', "..-.."}, /* ae */
 183         {'À', "..--"},  /* yu */
 184         {'Ñ', ".-.-"},  /* ya */
 185
 186         {'\0', ""}
 187 };
 188
 189 struct tone_data {
 190         int16_t *data;
 191         size_t  len;
 192 };
 193
 194 void            alloc_soundbuf(struct tone_data *, double, int);
 195 void            morse(char, int);
 196 void            show(const char *, int);
 197 void            play(const char *, int);
 198 void            ttyout(const char *, int);
 199 void            sighandler(int);
 200
 201 #define GETOPTOPTS "d:ef:opP:sw:W:"
 202 #define USAGE \
 203 "usage: morse [-s] [-e] [-p | -o] [-P device] [-d device] [-w speed] [-W speed] [-f frequency] [string ...]\n"
 204
 205 static int      oflag, pflag, sflag, eflag;
 206 static int      wpm = 20;       /* words per minute */
 207 static int      farnsworth = -1;
 208 #define FREQUENCY 600
 209 static int      freq = FREQUENCY;
 210 static char     *device;        /* for tty-controlled generator */
 211
 212 static struct tone_data tone_dot, tone_dash, tone_silence, tone_letter_silence;
 213 #define DSP_RATE 44100
 214 static const char *snddev = NULL;
 215
 216 #define DASH_LEN 3
 217 #define CHAR_SPACE 3
 218 #define WORD_SPACE (7 - CHAR_SPACE)
 219 static float    dot_clock, word_clock;
 220 int             spkr, line;
 221 struct termios  otty, ntty;
 222 int             olflags;
 223
 224 static const struct morsetab *hightab;
 225
 226 int
 227 main(int argc, char **argv)
 228 {
 229         int    ch, lflags;
 230         int    prosign;
 231         char  *p, *codeset;
 232
 233         while ((ch = getopt(argc, argv, GETOPTOPTS)) != -1)
 234                 switch ((char) ch) {
 235                 case 'd':
 236                         device = optarg;
 237                         break;
 238                 case 'e':
 239                         eflag = 1;
 240                         setvbuf(stdout, 0, _IONBF, 0);
 241                         break;
 242                 case 'f':
 243                         freq = atoi(optarg);
 244                         break;
 245                 case 'o':
 246                         oflag = 1;
 247                         /* FALLTHROUGH */
 248                 case 'p':
 249                         pflag = 1;
 250                         break;
 251                 case 'P':
 252                         snddev = optarg;
 253                         break;
 254                 case 's':
 255                         sflag = 1;
 256                         break;
 257                 case 'w':
 258                         wpm = atoi(optarg);
 259                         break;
 260                 case 'W':
 261                         farnsworth = atoi(optarg);
 262                         break;
 263                 case '?':
 264                 default:
 265                         fputs(USAGE, stderr);
 266                         exit(1);
 267                 }
 268         if (pflag + !!device + sflag > 1) {
 269                 fputs("morse: only one of -o, -p, -d and -s allowed\n", stderr);
 270                 exit(1);
 271         }
 272         if ((pflag || device) && ((wpm < 1) || (wpm > 60) || (farnsworth > 60))) {
 273                 fputs("morse: insane speed\n", stderr);
 274                 exit(1);
 275         }
 276         if ((pflag || device) && (freq == 0))
 277                 freq = FREQUENCY;
 278         if (pflag || device) {
 279                 /*
 280                  * A note on how to get to this magic 1.2:
 281                  * x WPM = 50*x dits per minute (norm word "PARIS").
 282                  * dits per sec = dits per minute / 60, thus
 283                  * dits per sec = 50 * x / 60 = x / (60 / 50) = x / 1.2
 284                  */
 285                 dot_clock = wpm / 1.2;          /* dots/sec */
 286                 dot_clock = 1 / dot_clock;      /* duration of a dot */
 287
 288                 word_clock = dot_clock;
 289
 290                 /*
 291                  * This is how to get to this formula:
 292                  * PARIS = 22 dit (symbols) + 9 symbol spaces = 31 symbol times
 293                  *       + 19 space times.
 294                  *
 295                  * The symbol times are in dot_clock, so the spaces have to
 296                  * make up to reach the farnsworth time.
 297                  */
 298                 if (farnsworth > 0)
 299                         word_clock = (60.0 / farnsworth - 31 * dot_clock) / 19;
 300         }
 301         if (snddev == NULL) {
 302                 if (oflag)
 303                         snddev = "-";
 304                 else /* only pflag */
 305                         snddev = "/dev/dsp";
 306         }
 307
 308         if (pflag) {
 309                 snd_chan_param param;
 310
 311                 if (oflag && strcmp(snddev, "-") == 0)
 312                         spkr = STDOUT_FILENO;
 313                 else
 314                         spkr = open(snddev, O_WRONLY, 0);
 315                 if (spkr == -1)
 316                         err(1, "%s", snddev);
 317                 param.play_rate = DSP_RATE;
 318                 param.play_format = AFMT_S16_NE;
 319                 param.rec_rate = 0;
 320                 param.rec_format = 0;
 321                 if (!oflag && ioctl(spkr, AIOSFMT, &param) != 0)
 322                         err(1, "%s: set format", snddev);
 323                 alloc_soundbuf(&tone_dot, dot_clock, 1);
 324                 alloc_soundbuf(&tone_dash, DASH_LEN * dot_clock, 1);
 325                 alloc_soundbuf(&tone_silence, dot_clock, 0);
 326                 alloc_soundbuf(&tone_letter_silence, word_clock, 0);
 327         } else
 328         if (device) {
 329                 if ((line = open(device, O_WRONLY | O_NONBLOCK)) == -1) {
 330                         perror("open tty line");
 331                         exit(1);
 332                 }
 333                 if (tcgetattr(line, &otty) == -1) {
 334                         perror("tcgetattr() failed");
 335                         exit(1);
 336                 }
 337                 ntty = otty;
 338                 ntty.c_cflag |= CLOCAL;
 339                 tcsetattr(line, TCSANOW, &ntty);
 340                 lflags = fcntl(line, F_GETFL);
 341                 lflags &= ~O_NONBLOCK;
 342                 fcntl(line, F_SETFL, &lflags);
 343                 ioctl(line, TIOCMGET, &lflags);
 344                 lflags &= ~TIOCM_RTS;
 345                 olflags = lflags;
 346                 ioctl(line, TIOCMSET, &lflags);
 347                 (void)signal(SIGHUP, sighandler);
 348                 (void)signal(SIGINT, sighandler);
 349                 (void)signal(SIGQUIT, sighandler);
 350                 (void)signal(SIGTERM, sighandler);
 351         }
 352
 353         argc -= optind;
 354         argv += optind;
 355
 356         if (setlocale(LC_CTYPE, "") != NULL &&
 357             *(codeset = nl_langinfo(CODESET)) != '\0') {
 358                 if (strcmp(codeset, "KOI8-R") == 0)
 359                         hightab = koi8rtab;
 360                 else if (strcmp(codeset, "ISO8859-1") == 0 ||
 361                          strcmp(codeset, "ISO8859-15") == 0)
 362                         hightab = iso8859tab;
 363         }
 364
 365         if (*argv) {
 366                 do {
 367                         prosign = 0;
 368                         for (p = *argv; *p; ++p) {
 369                                 if (eflag)
 370                                         putchar(*p);
 371                                 if (*p == '<' || *p == '>') {
 372                                         prosign = *p == '<';
 373                                         continue;
 374                                 }
 375                                 if (strchr("> \r\n", *(p + 1)) != NULL)
 376                                         prosign = 0;
 377                                 morse(*p, prosign);
 378                         }
 379                         if (eflag)
 380                                 putchar(' ');
 381                         morse(' ', 0);
 382                 } while (*++argv);
 383         } else {
 384                 prosign = 0;
 385                 while ((ch = getchar()) != EOF) {
 386                         if (eflag)
 387                                 putchar(ch);
 388                         if (ch == '<') {
 389                                 prosign = 1;
 390                                 continue;
 391                         }
 392                         if (prosign) {
 393                                 int tch;
 394
 395                                 tch = getchar();
 396                                 if (strchr("> \r\n", tch) != NULL)
 397                                         prosign = 0;
 398                                 if (tch != '>')
 399                                         ungetc(tch, stdin);
 400                         }
 401                         morse(ch, prosign);
 402                 }
 403         }
 404         if (device)
 405                 tcsetattr(line, TCSANOW, &otty);
 406         exit(0);
 407 }
 408
 409 void
 410 alloc_soundbuf(struct tone_data *tone, double len, int on)
 411 {
 412         int samples, i;
 413
 414         samples = DSP_RATE * len;
 415         tone->len = samples * sizeof(*tone->data);
 416         tone->data = malloc(tone->len);
 417         if (tone->data == NULL)
 418                 err(1, NULL);
 419         if (!on) {
 420                 bzero(tone->data, tone->len);
 421                 return;
 422         }
 423
 424         /*
 425          * We create a sinus with the specified frequency and smooth
 426          * the edges to reduce key clicks.
 427          */
 428         for (i = 0; i < samples; i++) {
 429                 double filter = 1;
 430
 431 #define FILTER_SAMPLES 100
 432                 if (i < FILTER_SAMPLES || i > samples - FILTER_SAMPLES) {
 433                         /*
 434                          * Gauss window
 435                          */
 436 #ifdef GAUSS_FILTER
 437                         int fi = i;
 438
 439                         if (i > FILTER_SAMPLES)
 440                                 fi = samples - i;
 441                         filter = exp(-4.0 *
 442                                      pow((double)(FILTER_SAMPLES - fi) /
 443                                          FILTER_SAMPLES, 2));
 444 #else
 445                         /*
 446                          * Triangle window
 447                          */
 448                         if (i < FILTER_SAMPLES)
 449                                 filter = (double)i / FILTER_SAMPLES;
 450                         else
 451                                 filter = (double)(samples - i) / FILTER_SAMPLES;
 452 #endif
 453                 }
 454                 tone->data[i] = 32767 * sin((double)i / samples * len * freq * 2 * M_PI) *
 455                     filter;
 456         }
 457 }
 458
 459 void
 460 morse(char c, int prosign)
 461 {
 462         const struct morsetab *m;
 463
 464         if (isalpha((unsigned char)c))
 465                 c = tolower((unsigned char)c);
 466         if ((c == '\r') || (c == '\n'))
 467                 c = ' ';
 468         if (c == ' ') {
 469                 if (pflag) {
 470                         play(" ", 0);
 471                         return;
 472                 } else if (device) {
 473                         ttyout(" ", 0);
 474                         return;
 475                 } else {
 476                         show("", 0);
 477                         return;
 478                 }
 479         }
 480         for (m = ((unsigned char)c < 0x80? mtab: hightab);
 481              m != NULL && m->inchar != '\0';
 482              m++) {
 483                 if (m->inchar == c) {
 484                         if (pflag) {
 485                                 play(m->morse, prosign);
 486                         } else if (device) {
 487                                 ttyout(m->morse, prosign);
 488                         } else
 489                                 show(m->morse, prosign);
 490                 }
 491         }
 492 }
 493
 494 void
 495 show(const char *s, int prosign)
 496 {
 497         if (sflag)
 498                 printf(" %s", s);
 499         else
 500                 for (; *s; ++s)
 501                         printf(" %s", *s == '.' ? "dit" : "dah");
 502         if (!prosign)
 503                 printf("\n");
 504 }
 505
 506 void
 507 play(const char *s, int prosign)
 508 {
 509         const char *c;
 510         int duration;
 511         struct tone_data *tone;
 512
 513         /*
 514          * We don't need to usleep() here, as the sound device blocks.
 515          */
 516         for (c = s; *c != '\0'; c++) {
 517                 switch (*c) {
 518                 case '.':
 519                         duration = 1;
 520                         tone = &tone_dot;
 521                         break;
 522                 case '-':
 523                         duration = 1;
 524                         tone = &tone_dash;
 525                         break;
 526                 case ' ':
 527                         duration = WORD_SPACE;
 528                         tone = &tone_letter_silence;
 529                         break;
 530                 default:
 531                         errx(1, "invalid morse digit");
 532                 }
 533                 while (duration-- > 0)
 534                         write(spkr, tone->data, tone->len);
 535                 /* Only space within a symbol */
 536                 if (c[1] != '\0' || prosign)
 537                         write(spkr, tone_silence.data, tone_silence.len);
 538         }
 539         if (prosign)
 540                 return;
 541         duration = CHAR_SPACE;
 542         while (duration-- > 0)
 543                 write(spkr, tone_letter_silence.data, tone_letter_silence.len);
 544
 545         /* Sync out the audio data with other output */
 546         if (!oflag)
 547                 ioctl(spkr, SNDCTL_DSP_SYNC, NULL);
 548 }
 549
 550 void
 551 ttyout(const char *s, int prosign)
 552 {
 553         const char *c;
 554         int duration, on, lflags;
 555
 556         for (c = s; *c != '\0'; c++) {
 557                 switch (*c) {
 558                 case '.':
 559                         on = 1;
 560                         duration = dot_clock;
 561                         break;
 562                 case '-':
 563                         on = 1;
 564                         duration = dot_clock * DASH_LEN;
 565                         break;
 566                 case ' ':
 567                         on = 0;
 568                         duration = word_clock * WORD_SPACE;
 569                         break;
 570                 default:
 571                         on = 0;
 572                         duration = 0;
 573                 }
 574                 if (on) {
 575                         ioctl(line, TIOCMGET, &lflags);
 576                         lflags |= TIOCM_RTS;
 577                         ioctl(line, TIOCMSET, &lflags);
 578                 }
 579                 duration *= 1000000;
 580                 if (duration)
 581                         usleep(duration);
 582                 ioctl(line, TIOCMGET, &lflags);
 583                 lflags &= ~TIOCM_RTS;
 584                 ioctl(line, TIOCMSET, &lflags);
 585                 duration = dot_clock * 1000000;
 586                 /* Only space within a symbol */
 587                 if (c[1] != '\0' || prosign)
 588                         usleep(duration);
 589         }
 590         if (!prosign) {
 591                 duration = word_clock * CHAR_SPACE * 1000000;
 592                 usleep(duration);
 593         }
 594 }
 595
 596 void
 597 sighandler(int signo)
 598 {
 599
 600         ioctl(line, TIOCMSET, &olflags);
 601         tcsetattr(line, TCSANOW, &otty);
 602
 603         signal(signo, SIG_DFL);
 604         (void)kill(getpid(), signo);
 605 }