release/src/router/libncurses/progs/tabs.c

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey                        2008                    *
  31  ****************************************************************************/
  32
  33 /*
  34  * tabs.c --  set terminal hard-tabstops
  35  */
  36
  37 #define USE_LIBTINFO
  38 #include <progs.priv.h>
  39
  40 MODULE_ID("$Id: tabs.c,v 1.37 2015/07/04 21:14:42 tom Exp $")
  41
  42 static void usage(void) GCC_NORETURN;
  43
  44 static char *prg_name;
  45 static int max_cols;
  46
  47 static void
  48 failed(const char *s)
  49 {
  50     perror(s);
  51     ExitProgram(EXIT_FAILURE);
  52 }
  53
  54 static int
  55 putch(int c)
  56 {
  57     return putchar(c);
  58 }
  59
  60 static void
  61 do_tabs(int *tab_list)
  62 {
  63     int last = 1;
  64     int stop;
  65
  66     putchar('\r');
  67     while ((stop = *tab_list++) > 0) {
  68         if (last < stop) {
  69             while (last++ < stop) {
  70                 if (last > max_cols)
  71                     break;
  72                 putchar(' ');
  73             }
  74         }
  75         if (stop <= max_cols) {
  76             tputs(tparm(set_tab, stop), 1, putch);
  77             last = stop;
  78         } else {
  79             break;
  80         }
  81     }
  82     putchar('\r');
  83 }
  84
  85 static int *
  86 decode_tabs(const char *tab_list)
  87 {
  88     int *result = typeCalloc(int, strlen(tab_list) + (unsigned) max_cols);
  89     int n = 0;
  90     int value = 0;
  91     int prior = 0;
  92     int ch;
  93
  94     if (result == 0)
  95         failed("decode_tabs");
  96
  97     while ((ch = *tab_list++) != '\0') {
  98         if (isdigit(UChar(ch))) {
  99             value *= 10;
 100             value += (ch - '0');
 101         } else if (ch == ',') {
 102             result[n] = value + prior;
 103             if (n > 0 && result[n] <= result[n - 1]) {
 104                 fprintf(stderr,
 105                         "%s: tab-stops are not in increasing order: %d %d\n",
 106                         prg_name, value, result[n - 1]);
 107                 free(result);
 108                 result = 0;
 109                 break;
 110             }
 111             ++n;
 112             value = 0;
 113             prior = 0;
 114         } else if (ch == '+') {
 115             if (n)
 116                 prior = result[n - 1];
 117         }
 118     }
 119
 120     if (result != 0) {
 121         /*
 122          * If there is only one value, then it is an option such as "-8".
 123          */
 124         if ((n == 0) && (value > 0)) {
 125             int step = value;
 126             value = 1;
 127             while (n < max_cols - 1) {
 128                 result[n++] = value;
 129                 value += step;
 130             }
 131         }
 132
 133         /*
 134          * Add the last value, if any.
 135          */
 136         result[n++] = value + prior;
 137         result[n] = 0;
 138     }
 139
 140     return result;
 141 }
 142
 143 static void
 144 print_ruler(int *tab_list)
 145 {
 146     int last = 0;
 147     int stop;
 148     int n;
 149
 150     /* first print a readable ruler */
 151     for (n = 0; n < max_cols; n += 10) {
 152         int ch = 1 + (n / 10);
 153         char buffer[20];
 154         _nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer))
 155                     "----+----%c",
 156                     ((ch < 10)
 157                      ? (ch + '0')
 158                      : (ch + 'A' - 10)));
 159         printf("%.*s", ((max_cols - n) > 10) ? 10 : (max_cols - n), buffer);
 160     }
 161     putchar('\n');
 162
 163     /* now, print '*' for each stop */
 164     for (n = 0, last = 0; (tab_list[n] > 0) && (last < max_cols); ++n) {
 165         stop = tab_list[n];
 166         while (++last < stop) {
 167             if (last <= max_cols) {
 168                 putchar('-');
 169             } else {
 170                 break;
 171             }
 172         }
 173         if (last <= max_cols) {
 174             putchar('*');
 175             last = stop;
 176         } else {
 177             break;
 178         }
 179     }
 180     while (++last <= max_cols)
 181         putchar('-');
 182     putchar('\n');
 183 }
 184
 185 /*
 186  * Write an '*' on each tabstop, to demonstrate whether it lines up with the
 187  * ruler.
 188  */
 189 static void
 190 write_tabs(int *tab_list)
 191 {
 192     int stop;
 193
 194     while ((stop = *tab_list++) > 0 && stop <= max_cols) {
 195         fputs((stop == 1) ? "*" : "\t*", stdout);
 196     };
 197     /* also show a tab _past_ the stops */
 198     if (stop < max_cols)
 199         fputs("\t+", stdout);
 200     putchar('\n');
 201 }
 202
 203 /*
 204  * Trim leading/trailing blanks, as well as blanks after a comma.
 205  * Convert embedded blanks to commas.
 206  */
 207 static char *
 208 trimmed_tab_list(const char *source)
 209 {
 210     char *result = strdup(source);
 211     int ch, j, k, last;
 212
 213     if (result != 0) {
 214         for (j = k = last = 0; result[j] != 0; ++j) {
 215             ch = UChar(result[j]);
 216             if (isspace(ch)) {
 217                 if (last == '\0') {
 218                     continue;
 219                 } else if (isdigit(last) || last == ',') {
 220                     ch = ',';
 221                 }
 222             } else if (ch == ',') {
 223                 ;
 224             } else {
 225                 if (last == ',')
 226                     result[k++] = (char) last;
 227                 result[k++] = (char) ch;
 228             }
 229             last = ch;
 230         }
 231         result[k] = '\0';
 232     }
 233     return result;
 234 }
 235
 236 static bool
 237 comma_is_needed(const char *source)
 238 {
 239     bool result = FALSE;
 240
 241     if (source != 0) {
 242         size_t len = strlen(source);
 243         if (len != 0)
 244             result = (source[len - 1] != ',');
 245     } else {
 246         result = FALSE;
 247     }
 248     return result;
 249 }
 250
 251 /*
 252  * Add a command-line parameter to the tab-list.  It can be blank- or comma-
 253  * separated (or a mixture).  For simplicity, empty tabs are ignored, e.g.,
 254  *      tabs 1,,6,11
 255  *      tabs 1,6,11
 256  * are treated the same.
 257  */
 258 static const char *
 259 add_to_tab_list(char **append, const char *value)
 260 {
 261     char *result = *append;
 262     char *copied = trimmed_tab_list(value);
 263
 264     if (copied != 0 && *copied != '\0') {
 265         const char *comma = ",";
 266         size_t need = 1 + strlen(copied);
 267
 268         if (*copied == ',')
 269             comma = "";
 270         else if (!comma_is_needed(*append))
 271             comma = "";
 272
 273         need += strlen(comma);
 274         if (*append != 0)
 275             need += strlen(*append);
 276
 277         result = malloc(need);
 278         if (result == 0)
 279             failed("add_to_tab_list");
 280
 281         *result = '\0';
 282         if (*append != 0) {
 283             _nc_STRCPY(result, *append, need);
 284             free(*append);
 285         }
 286         _nc_STRCAT(result, comma, need);
 287         _nc_STRCAT(result, copied, need);
 288
 289         *append = result;
 290     }
 291     free(copied);
 292     return result;
 293 }
 294
 295 /*
 296  * Check for illegal characters in the tab-list.
 297  */
 298 static bool
 299 legal_tab_list(const char *tab_list)
 300 {
 301     bool result = TRUE;
 302
 303     if (tab_list != 0 && *tab_list != '\0') {
 304         if (comma_is_needed(tab_list)) {
 305             int n, ch;
 306             for (n = 0; tab_list[n] != '\0'; ++n) {
 307                 ch = UChar(tab_list[n]);
 308                 if (!(isdigit(ch) || ch == ',' || ch == '+')) {
 309                     fprintf(stderr,
 310                             "%s: unexpected character found '%c'\n",
 311                             prg_name, ch);
 312                     result = FALSE;
 313                     break;
 314                 }
 315             }
 316         } else {
 317             fprintf(stderr, "%s: trailing comma found '%s'\n", prg_name, tab_list);
 318             result = FALSE;
 319         }
 320     } else {
 321         fprintf(stderr, "%s: no tab-list given\n", prg_name);
 322         result = FALSE;
 323     }
 324     return result;
 325 }
 326
 327 static char *
 328 skip_list(char *value)
 329 {
 330     while (*value != '\0' &&
 331            (isdigit(UChar(*value)) ||
 332             isspace(UChar(*value)) ||
 333             strchr("+,", UChar(*value)) != 0)) {
 334         ++value;
 335     }
 336     return value;
 337 }
 338
 339 static void
 340 usage(void)
 341 {
 342 #define DATA(s) s "\n"
 343     static const char msg[] =
 344     {
 345         DATA("Usage: tabs [options] [tabstop-list]")
 346         DATA("")
 347         DATA("Options:")
 348         DATA("  -0       reset tabs")
 349         DATA("  -8       set tabs to standard interval")
 350         DATA("  -a       Assembler, IBM S/370, first format")
 351         DATA("  -a2      Assembler, IBM S/370, second format")
 352         DATA("  -c       COBOL, normal format")
 353         DATA("  -c2      COBOL compact format")
 354         DATA("  -c3      COBOL compact format extended")
 355         DATA("  -d       debug (show ruler with expected/actual tab positions)")
 356         DATA("  -f       FORTRAN")
 357         DATA("  -n       no-op (do not modify terminal settings)")
 358         DATA("  -p       PL/I")
 359         DATA("  -s       SNOBOL")
 360         DATA("  -u       UNIVAC 1100 Assembler")
 361         DATA("  -T name  use terminal type 'name'")
 362         DATA("  -V       print version")
 363         DATA("")
 364         DATA("A tabstop-list is an ordered list of column numbers, e.g., 1,11,21")
 365         DATA("or 1,+10,+10 which is the same.")
 366     };
 367 #undef DATA
 368
 369     fflush(stdout);
 370     fputs(msg, stderr);
 371     ExitProgram(EXIT_FAILURE);
 372 }
 373
 374 int
 375 main(int argc, char *argv[])
 376 {
 377     int rc = EXIT_FAILURE;
 378     bool debug = FALSE;
 379     bool no_op = FALSE;
 380     int n, ch;
 381     NCURSES_CONST char *term_name = 0;
 382     char *append = 0;
 383     const char *tab_list = 0;
 384
 385     prg_name = _nc_rootname(argv[0]);
 386
 387     if ((term_name = getenv("TERM")) == 0)
 388         term_name = "ansi+tabs";
 389
 390     /* cannot use getopt, since some options are two-character */
 391     for (n = 1; n < argc; ++n) {
 392         char *option = argv[n];
 393         switch (option[0]) {
 394         case '-':
 395             while ((ch = *++option) != '\0') {
 396                 switch (ch) {
 397                 case 'a':
 398                     switch (*++option) {
 399                     default:
 400                     case '\0':
 401                         tab_list = "1,10,16,36,72";
 402                         option--;
 403                         /* Assembler, IBM S/370, first format */
 404                         break;
 405                     case '2':
 406                         tab_list = "1,10,16,40,72";
 407                         /* Assembler, IBM S/370, second format */
 408                         break;
 409                     }
 410                     break;
 411                 case 'c':
 412                     switch (*++option) {
 413                     default:
 414                     case '\0':
 415                         tab_list = "1,8,12,16,20,55";
 416                         option--;
 417                         /* COBOL, normal format */
 418                         break;
 419                     case '2':
 420                         tab_list = "1,6,10,14,49";
 421                         /* COBOL compact format */
 422                         break;
 423                     case '3':
 424                         tab_list = "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67";
 425                         /* COBOL compact format extended */
 426                         break;
 427                     }
 428                     break;
 429                 case 'd':       /* ncurses extension */
 430                     debug = TRUE;
 431                     break;
 432                 case 'f':
 433                     tab_list = "1,7,11,15,19,23";
 434                     /* FORTRAN */
 435                     break;
 436                 case 'n':       /* ncurses extension */
 437                     no_op = TRUE;
 438                     break;
 439                 case 'p':
 440                     tab_list = "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61";
 441                     /* PL/I */
 442                     break;
 443                 case 's':
 444                     tab_list = "1,10,55";
 445                     /* SNOBOL */
 446                     break;
 447                 case 'u':
 448                     tab_list = "1,12,20,44";
 449                     /* UNIVAC 1100 Assembler */
 450                     break;
 451                 case 'T':
 452                     ++n;
 453                     if (*++option != '\0') {
 454                         term_name = option;
 455                     } else {
 456                         term_name = argv[n++];
 457                         option--;
 458                     }
 459                     option += ((int) strlen(option)) - 1;
 460                     continue;
 461                 case 'V':
 462                     puts(curses_version());
 463                     ExitProgram(EXIT_SUCCESS);
 464                 default:
 465                     if (isdigit(UChar(*option))) {
 466                         char *copy = strdup(option);
 467                         *skip_list(copy) = '\0';
 468                         tab_list = copy;
 469                         option = skip_list(option) - 1;
 470                     } else {
 471                         usage();
 472                     }
 473                     break;
 474                 }
 475             }
 476             break;
 477         case '+':
 478             while ((ch = *++option) != '\0') {
 479                 switch (ch) {
 480                 case 'm':
 481                     /*
 482                      * The "+mXXX" option is unimplemented because only the long-obsolete
 483                      * att510d implements smgl, which is needed to support
 484                      * this option.
 485                      */
 486                     break;
 487                 default:
 488                     /* special case of relative stops separated by spaces? */
 489                     if (option == argv[n] + 1) {
 490                         tab_list = add_to_tab_list(&append, argv[n]);
 491                     }
 492                     break;
 493                 }
 494             }
 495             break;
 496         default:
 497             if (append != 0) {
 498                 if (tab_list != (const char *) append) {
 499                     /* one of the predefined options was used */
 500                     free(append);
 501                     append = 0;
 502                 }
 503             }
 504             tab_list = add_to_tab_list(&append, option);
 505             break;
 506         }
 507     }
 508
 509     setupterm(term_name, STDOUT_FILENO, (int *) 0);
 510
 511     max_cols = (columns > 0) ? columns : 80;
 512
 513     if (!VALID_STRING(clear_all_tabs)) {
 514         fprintf(stderr,
 515                 "%s: terminal type '%s' cannot reset tabs\n",
 516                 prg_name, term_name);
 517     } else if (!VALID_STRING(set_tab)) {
 518         fprintf(stderr,
 519                 "%s: terminal type '%s' cannot set tabs\n",
 520                 prg_name, term_name);
 521     } else if (legal_tab_list(tab_list)) {
 522         int *list = decode_tabs(tab_list);
 523
 524         if (!no_op)
 525             tputs(clear_all_tabs, 1, putch);
 526
 527         if (list != 0) {
 528             if (!no_op)
 529                 do_tabs(list);
 530             if (debug) {
 531                 fflush(stderr);
 532                 printf("tabs %s\n", tab_list);
 533                 print_ruler(list);
 534                 write_tabs(list);
 535             }
 536             free(list);
 537         } else if (debug) {
 538             fflush(stderr);
 539             printf("tabs %s\n", tab_list);
 540         }
 541         rc = EXIT_SUCCESS;
 542     }
 543     if (append != 0)
 544         free(append);
 545     ExitProgram(rc);
 546 }