colorize.c

   1 /*
   2  * colorize - Read text from standard input stream or file and print
   3  *            it colorized through use of ANSI escape sequences
   4  *
   5  * Copyright (c) 2011-2013 Steven Schubiger
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 #define _POSIX_SOURCE
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <errno.h>
  26 #include <getopt.h>
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/time.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36
  37 #define DEBUG 0
  38
  39 #define str(arg) #arg
  40 #define to_str(arg) str(arg)
  41
  42 #define streq(s1, s2) (strcmp (s1, s2) == 0)
  43
  44 #if DEBUG
  45 # define xmalloc(size)       malloc_wrap_debug(size,       __FILE__, __LINE__)
  46 # define xrealloc(ptr, size) realloc_wrap_debug(ptr, size, __FILE__, __LINE__)
  47 #else
  48 # define xmalloc(size)       malloc_wrap(size)
  49 # define xrealloc(ptr, size) realloc_wrap(ptr, size)
  50 #endif
  51
  52 #define free_null(ptr) free_wrap((void **)&ptr)
  53 #define xstrdup(str)   strdup_wrap(str)
  54
  55 #if !defined BUF_SIZE || BUF_SIZE <= 0
  56 # undef BUF_SIZE
  57 # define BUF_SIZE 4096 + 1
  58 #endif
  59
  60 #define LF 0x01
  61 #define CR 0x02
  62
  63 #define SKIP_LINE_ENDINGS(flags) (((flags) & CR) && ((flags) & LF) ? 2 : 1)
  64
  65 #define STACK_VAR(ptr) do {                                   \
  66     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  67 } while (false);
  68
  69 #define RELEASE_VAR(ptr) do {                             \
  70     release_var (vars_list, stacked_vars, (void **)&ptr); \
  71 } while (false);
  72
  73 #define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                               \
  74     fprintf (stderr, "Memory allocation failure in source file %s, line %d\n", file, line); \
  75     exit (2);                                                                               \
  76 } while (false);
  77 #define MEM_ALLOC_FAIL() do {                                          \
  78     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  79     exit (2);                                                          \
  80 } while (false);
  81
  82 #define ABORT_TRACE()                                                              \
  83     fprintf (stderr, "Aborting in source file %s, line %d\n", __FILE__, __LINE__); \
  84     abort ();                                                                      \
  85
  86 #define CHECK_COLORS_RANDOM(color1, color2)        \
  87      streq (color_names[color1]->name, "random")   \
  88  && (streq (color_names[color2]->name, "none")     \
  89   || streq (color_names[color2]->name, "default")) \
  90
  91 #define VERSION "0.48"
  92
  93 typedef unsigned short bool;
  94
  95 enum { false, true };
  96
  97 struct color_name {
  98     char *name;
  99     char *orig;
 100 };
 101
 102 static struct color_name *color_names[3] = { NULL, NULL, NULL };
 103
 104 struct color {
 105     const char *name;
 106     const char *code;
 107 };
 108
 109 static const struct color fg_colors[] = {
 110     { "none",     NULL },
 111     { "black",   "30m" },
 112     { "red",     "31m" },
 113     { "green",   "32m" },
 114     { "yellow",  "33m" },
 115     { "blue",    "34m" },
 116     { "cyan",    "35m" },
 117     { "magenta", "36m" },
 118     { "white",   "37m" },
 119     { "default", "39m" },
 120 };
 121 static const struct color bg_colors[] = {
 122     { "none",     NULL },
 123     { "black",   "40m" },
 124     { "red",     "41m" },
 125     { "green",   "42m" },
 126     { "yellow",  "43m" },
 127     { "blue",    "44m" },
 128     { "cyan",    "45m" },
 129     { "magenta", "46m" },
 130     { "white",   "47m" },
 131     { "default", "49m" },
 132 };
 133
 134 enum fmts {
 135     FMT_GENERIC,
 136     FMT_COLOR,
 137     FMT_RANDOM,
 138     FMT_ERROR,
 139     FMT_FILE
 140 };
 141 static const char *formats[] = {
 142     "%s",                    /* generic */
 143     "%s color '%s' %s",      /* color   */
 144     "%s color '%s' %s '%s'", /* random  */
 145     "less than %d bytes %s", /* error   */
 146     "%s: %s",                /* file    */
 147 };
 148
 149 enum { FOREGROUND, BACKGROUND };
 150
 151 static const struct {
 152     struct color const *entries;
 153     unsigned int count;
 154     const char *desc;
 155 } tables[] = {
 156     { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
 157     { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
 158 };
 159
 160 enum stream_mode { SCAN_FIRST = 1, SCAN_ALWAYS };
 161
 162 struct ending {
 163     unsigned int flags;
 164     const char newline[3];
 165 };
 166
 167 static const struct ending endings[] = {
 168     { CR & LF, "\r\n" },
 169     { CR,      "\r"   },
 170     { LF,      "\n"   },
 171 };
 172
 173 static FILE *stream = NULL;
 174
 175 static unsigned int stacked_vars = 0;
 176 static void **vars_list = NULL;
 177
 178 static bool clean = false;
 179 static char *exclude = NULL;
 180
 181 static const char *program_name;
 182
 183 static void print_help (void);
 184 static void print_version (void);
 185 static void cleanup (void);
 186 static void free_color_names (struct color_name **);
 187 static void process_options (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
 188 static void process_file_option (const char *, const char **, FILE **);
 189 static void read_print_stream (bool, const struct color **, const char *, FILE *, enum stream_mode);
 190 static void find_color_entries (struct color_name **, const struct color **);
 191 static void find_color_entry (const char *const, unsigned int, const struct color **);
 192 static void print_line (const struct color **, bool, const char * const, unsigned int);
 193 static void print_clean (const char *);
 194 static void print_free_offsets (const char *, char ***, unsigned int);
 195 static void *malloc_wrap (size_t);
 196 static void *realloc_wrap (void *, size_t);
 197 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 198 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 199 static void free_wrap (void **);
 200 static char *strdup_wrap (const char *);
 201 static char *str_concat (const char *, const char *);
 202 static void vfprintf_fail (const char *, ...);
 203 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 204 static void release_var (void **, unsigned int, void **);
 205
 206 extern char *optarg;
 207 extern int optind;
 208
 209 int
 210 main (int argc, char **argv)
 211 {
 212     unsigned int arg_cnt = 0;
 213
 214     int opt;
 215     struct option long_opts[] = {
 216         { "clean",          no_argument,       NULL, 'c' },
 217         { "exclude-random", required_argument, NULL, 'e' },
 218         { "help",           no_argument,       NULL, 'h' },
 219         { "version",        no_argument,       NULL, 'v' },
 220         {  0,               0,                 0,     0  },
 221     };
 222
 223     bool bold = false;
 224
 225     const struct color *colors[2] = {
 226         NULL, /* foreground */
 227         NULL, /* background */
 228     };
 229
 230     const char *file;
 231
 232     enum stream_mode mode = SCAN_FIRST;
 233
 234     program_name = argv[0];
 235     atexit (cleanup);
 236
 237     setvbuf (stdout, NULL, _IOLBF, 0);
 238
 239     while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
 240       {
 241         switch (opt)
 242           {
 243             case 'c':
 244               clean = true;
 245               break;
 246             case 'e': {
 247               char *p;
 248               exclude = xstrdup (optarg);
 249               STACK_VAR (exclude);
 250               for (p = exclude; *p; p++)
 251                 *p = tolower (*p);
 252               if (streq (exclude, "random"))
 253                 vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a color");
 254               break;
 255             }
 256             case 'h':
 257               print_help ();
 258               exit (EXIT_SUCCESS);
 259             case 'v':
 260               print_version ();
 261               exit (EXIT_SUCCESS);
 262             case '?':
 263               print_help ();
 264               exit (EXIT_FAILURE);
 265             default: /* never reached */
 266               ABORT_TRACE ();
 267           }
 268       }
 269
 270     arg_cnt = argc - optind;
 271
 272     if (clean)
 273       {
 274         if (arg_cnt > 1)
 275           vfprintf_fail (formats[FMT_GENERIC], "--clean switch cannot be used with more than one file");
 276       }
 277     else
 278       {
 279         if (arg_cnt == 0 || arg_cnt > 2)
 280           {
 281             print_help ();
 282             exit (EXIT_FAILURE);
 283           }
 284       }
 285
 286     if (clean)
 287       process_file_option (argv[optind], &file, &stream);
 288     else
 289       process_options (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 290     read_print_stream (bold, colors, file, stream, mode);
 291
 292     RELEASE_VAR (exclude);
 293
 294     exit (EXIT_SUCCESS);
 295 }
 296
 297 static void
 298 print_help (void)
 299 {
 300     unsigned int i;
 301
 302     printf ("Usage: %s (foreground) OR (foreground)/(background) OR --clean [-|file]\n\n", program_name);
 303     printf ("\tColors (foreground) (background)\n");
 304     for (i = 0; i < tables[FOREGROUND].count; i++)
 305       {
 306         const struct color *entry = &tables[FOREGROUND].entries[i];
 307         const char *name = entry->name;
 308         const char *code = entry->code;
 309         if (code)
 310           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 311                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 312         else
 313           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 314       }
 315     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 316
 317     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 318     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 319
 320     printf ("\n\tOptions\n");
 321     printf ("\t\t    --clean\n");
 322     printf ("\t\t    --exclude-random\n");
 323     printf ("\t\t-h, --help\n");
 324     printf ("\t\t-v, --version\n\n");
 325 }
 326
 327 static void
 328 print_version (void)
 329 {
 330     const char *c_flags;
 331     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 332 #ifdef CFLAGS
 333     c_flags = to_str (CFLAGS);
 334 #else
 335     c_flags = "unknown";
 336 #endif
 337     printf ("Compiler flags: %s\n", c_flags);
 338     printf ("Buffer size: %d bytes\n", BUF_SIZE - 1);
 339 }
 340
 341 static void
 342 cleanup (void)
 343 {
 344     free_color_names (color_names);
 345
 346     if (stream && fileno (stream) != STDIN_FILENO)
 347       fclose (stream);
 348
 349     if (vars_list)
 350       {
 351         unsigned int i;
 352         for (i = 0; i < stacked_vars; i++)
 353           if (vars_list[i])
 354             free_null (vars_list[i]);
 355         free_null (vars_list);
 356       }
 357 }
 358
 359 static void
 360 free_color_names (struct color_name **color_names)
 361 {
 362     unsigned int i;
 363     for (i = 0; color_names[i]; i++)
 364       {
 365         free_null (color_names[i]->name);
 366         free_null (color_names[i]->orig);
 367         free_null (color_names[i]);
 368       }
 369 }
 370
 371 static void
 372 process_options (unsigned int arg_cnt, char **option_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 373 {
 374     int ret;
 375     unsigned int index;
 376     char *color, *p, *str;
 377     struct stat sb;
 378
 379     const char *color_string = arg_cnt >= 1 ? option_strings[0] : NULL;
 380     const char *file_string  = arg_cnt == 2 ? option_strings[1] : NULL;
 381
 382     assert (color_string);
 383
 384     if (streq (color_string, "-"))
 385       {
 386         if (file_string)
 387           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 388         else
 389           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 390       }
 391
 392     ret = stat (color_string, &sb);
 393
 394     /* Ensure that we don't fail if there's a file with one or more
 395        color names in its path.  */
 396     if (ret != -1)
 397       {
 398         bool have_file;
 399         unsigned int c;
 400         const char *color = color_string;
 401
 402         for (c = 1; c <= 2 && *color; c++)
 403           {
 404             bool matched = false;
 405             unsigned int i;
 406             for (i = 0; i < tables[FOREGROUND].count; i++)
 407               {
 408                 const struct color *entry = &tables[FOREGROUND].entries[i];
 409                 char *p;
 410                 if ((p = strstr (color, entry->name)) && p == color)
 411                   {
 412                     color = p + strlen (entry->name);
 413                     matched = true;
 414                     break;
 415                   }
 416               }
 417             if (matched && *color == '/' && *(color + 1))
 418               color++;
 419             else
 420               break;
 421           }
 422
 423         have_file = (*color != '\0');
 424
 425         if (have_file)
 426           {
 427             if (file_string)
 428               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 429             else
 430               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 431           }
 432       }
 433
 434     if ((p = strchr (color_string, '/')))
 435       {
 436         if (p == color_string)
 437           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 438         else if (p == color_string + strlen (color_string) - 1)
 439           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 440         else if (strchr (++p, '/'))
 441           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 442       }
 443
 444     str = xstrdup (color_string);
 445     STACK_VAR (str);
 446
 447     for (index = 0, color = str; *color; index++, color = p)
 448       {
 449         char *ch, *sep;
 450         if ((sep = strchr (color, '/')))
 451           {
 452             *sep = '\0';
 453             p = sep + 1;
 454           }
 455         else
 456           p = color + strlen (color);
 457
 458         for (ch = color; *ch; ch++)
 459           if (!isalpha (*ch))
 460             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 461
 462         for (ch = color + 1; *ch; ch++)
 463           if (!islower (*ch))
 464             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 465
 466         if (streq (color, "None"))
 467           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 468
 469         if (isupper (*color))
 470           {
 471             switch (index)
 472               {
 473                 case FOREGROUND:
 474                   *bold = true;
 475                   break;
 476                 case BACKGROUND:
 477                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 478                   break;
 479                 default: /* never reached */
 480                   ABORT_TRACE ();
 481               }
 482           }
 483
 484         color_names[index] = xmalloc (sizeof (struct color_name));
 485
 486         color_names[index]->orig = xstrdup (color);
 487
 488         for (ch = color; *ch; ch++)
 489           *ch = tolower (*ch);
 490
 491         color_names[index]->name = xstrdup (color);
 492       }
 493
 494     RELEASE_VAR (str);
 495
 496     assert (color_names[FOREGROUND]);
 497
 498     if (color_names[BACKGROUND])
 499       {
 500         unsigned int i;
 501         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 502         for (i = 0; i < 2; i++)
 503           {
 504             unsigned int color1 = color_sets[i][0];
 505             unsigned int color2 = color_sets[i][1];
 506             if (CHECK_COLORS_RANDOM (color1, color2))
 507               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 508           }
 509       }
 510
 511     find_color_entries (color_names, colors);
 512     free_color_names (color_names);
 513
 514     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 515       find_color_entry ("default", FOREGROUND, colors);
 516
 517     process_file_option (file_string, file, stream);
 518 }
 519
 520 static void
 521 process_file_option (const char *file_string, const char **file, FILE **stream)
 522 {
 523     if (file_string)
 524       {
 525         if (streq (file_string, "-"))
 526           *stream = stdin;
 527         else
 528           {
 529             FILE *s;
 530             const char *file = file_string;
 531             struct stat sb;
 532             int errno, ret;
 533
 534             errno = 0;
 535             ret = stat (file, &sb);
 536
 537             if (ret == -1)
 538               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 539
 540             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 541               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 542
 543             errno = 0;
 544
 545             s = fopen (file, "r");
 546             if (!s)
 547               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 548             *stream = s;
 549           }
 550         *file = file_string;
 551       }
 552     else
 553       {
 554         *stream = stdin;
 555         *file = "stdin";
 556       }
 557
 558     assert (*stream);
 559 }
 560
 561 #define MERGE_PRINT_LINE(part_line, line, flags) do {                   \
 562     char *merged_line = NULL;                                           \
 563     if (part_line)                                                      \
 564       {                                                                 \
 565         merged_line = str_concat (part_line, line);                     \
 566         free_null (part_line);                                          \
 567       }                                                                 \
 568     print_line (colors, bold, merged_line ? merged_line : line, flags); \
 569     free (merged_line);                                                 \
 570 } while (false);
 571
 572 static void
 573 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream, enum stream_mode mode)
 574 {
 575     char buf[BUF_SIZE], *part_line = NULL;
 576     unsigned int flags = 0;
 577     bool first = false, always = false;
 578
 579     switch (mode)
 580       {
 581         case SCAN_FIRST:
 582           first = true;
 583           break;
 584         case SCAN_ALWAYS:
 585           always = true;
 586           break;
 587         default: /* never reached */
 588           ABORT_TRACE ();
 589       }
 590
 591     while (!feof (stream))
 592       {
 593         size_t bytes_read;
 594         char *eol;
 595         const char *line;
 596         memset (buf, '\0', BUF_SIZE);
 597         bytes_read = fread (buf, 1, BUF_SIZE - 1, stream);
 598         if (bytes_read != (BUF_SIZE - 1) && ferror (stream))
 599           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE - 1, "read");
 600         line = buf;
 601         LOOP: while ((eol = strpbrk (line, "\n\r")))
 602           {
 603             char *p;
 604             if (first || always)
 605               {
 606                 first = false;
 607                 flags &= ~(CR|LF);
 608                 if (*eol == '\r')
 609                   {
 610                     flags |= CR;
 611                     if (*(eol + 1) == '\n')
 612                       flags |= LF;
 613                   }
 614                 else if (*eol == '\n')
 615                   flags |= LF;
 616                 else
 617                   vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 618               }
 619             if (always)
 620               p = eol + SKIP_LINE_ENDINGS (flags);
 621             else /* first */
 622               {
 623                 unsigned int i;
 624                 unsigned int count = sizeof (endings) / sizeof (struct ending);
 625                 for (i = 0; i < count; i++)
 626                   {
 627                     if (flags & endings[i].flags)
 628                       {
 629                         char *p;
 630                         if ((p = strstr (eol, endings[i].newline)) && p == eol)
 631                           break;
 632                         else
 633                           {
 634                             always = true;
 635                             goto LOOP;
 636                           }
 637                       }
 638                   }
 639                 p = eol + SKIP_LINE_ENDINGS (flags);
 640               }
 641             *eol = '\0';
 642             MERGE_PRINT_LINE (part_line, line, flags);
 643             line = p;
 644           }
 645         if (feof (stream)) {
 646           MERGE_PRINT_LINE (part_line, line, 0);
 647         }
 648         else
 649           {
 650             if (!clean) /* efficiency */
 651               print_line (colors, bold, line, 0);
 652             else if (!part_line)
 653               part_line = xstrdup (line);
 654             else
 655               {
 656                 char *merged_line = str_concat (part_line, line);
 657                 free (part_line);
 658                 part_line = merged_line;
 659               }
 660           }
 661       }
 662 }
 663
 664 static void
 665 find_color_entries (struct color_name **color_names, const struct color **colors)
 666 {
 667     struct timeval tv;
 668     unsigned int index;
 669
 670     /* randomness */
 671     gettimeofday (&tv, NULL);
 672     srand (tv.tv_usec * tv.tv_sec);
 673
 674     for (index = 0; color_names[index]; index++)
 675       {
 676         const char *color_name = color_names[index]->name;
 677
 678         const unsigned int count                = tables[index].count;
 679         const struct color *const color_entries = tables[index].entries;
 680
 681         if (streq (color_name, "random"))
 682           {
 683             bool excludable;
 684             unsigned int i;
 685             do {
 686               excludable = false;
 687               i = rand() % (count - 2) + 1; /* omit color none and default */
 688               switch (index)
 689                 {
 690                   case FOREGROUND:
 691                     /* --exclude-random */
 692                     if (exclude && streq (exclude, color_entries[i].name))
 693                       excludable = true;
 694                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 695                       excludable = true;
 696                     break;
 697                   case BACKGROUND:
 698                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 699                       excludable = true;
 700                     break;
 701                   default: /* never reached */
 702                     ABORT_TRACE ();
 703                  }
 704             } while (excludable);
 705             colors[index] = (struct color *)&color_entries[i];
 706           }
 707         else
 708           find_color_entry (color_name, index, colors);
 709       }
 710 }
 711
 712 static void
 713 find_color_entry (const char *const color_name, unsigned int index, const struct color **colors)
 714 {
 715     bool found = false;
 716     unsigned int i;
 717
 718     const unsigned int count                = tables[index].count;
 719     const struct color *const color_entries = tables[index].entries;
 720
 721     for (i = 0; i < count; i++)
 722       if (streq (color_name, color_entries[i].name))
 723         {
 724           colors[index] = (struct color *)&color_entries[i];
 725           found = true;
 726           break;
 727         }
 728     if (!found)
 729       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name, "not recognized");
 730 }
 731
 732 static void
 733 print_line (const struct color **colors, bool bold, const char *const line, unsigned int flags)
 734 {
 735     /* --clean */
 736     if (clean)
 737       print_clean (line);
 738     else
 739       {
 740         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 741           printf ("\033[%s", colors[BACKGROUND]->code);
 742         if (colors[FOREGROUND]->code)
 743           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 744         else
 745           printf (formats[FMT_GENERIC], line);
 746       }
 747     if (flags & CR)
 748       putchar ('\r');
 749     if (flags & LF)
 750       putchar ('\n');
 751 }
 752
 753 static void
 754 print_clean (const char *line)
 755 {
 756     const char *p;
 757     char ***offsets = NULL;
 758     unsigned int count = 0, i = 0;
 759
 760     for (p = line; *p;)
 761       {
 762         /* ESC[ */
 763         if (*p == 27 && *(p + 1) == '[')
 764           {
 765             bool check_values, first = true;
 766             const char *begin = p;
 767             p += 2;
 768             if (!isdigit (*p))
 769               goto END;
 770             do {
 771               const char *digit;
 772               check_values = false;
 773               if (!first && !isdigit (*p))
 774                 goto DISCARD;
 775               digit = p;
 776               while (isdigit (*p))
 777                 p++;
 778               if (p - digit > 2)
 779                 goto DISCARD;
 780               else /* check range */
 781                 {
 782                   char val[3];
 783                   int value;
 784                   unsigned int i;
 785                   const unsigned int digits = p - digit;
 786                   for (i = 0; i < digits; i++)
 787                     val[i] = *digit++;
 788                   val[i] = '\0';
 789                   value = atoi (val);
 790                   if (!((value >=  0 && value <=  8)   /* attributes        */
 791                      || (value >= 30 && value <= 37)   /* foreground colors */
 792                      || (value >= 40 && value <= 47)   /* background colors */
 793                      || (value == 39 || value == 49))) /* default colors    */
 794                     goto DISCARD;
 795                 }
 796               if (*p == ';')
 797                 {
 798                   p++;
 799                   check_values = true;
 800                 }
 801               first = false;
 802             } while (check_values);
 803             END: if (*p == 'm')
 804               {
 805                 const char *end = p;
 806                 if (!offsets)
 807                   offsets = xmalloc (++count * sizeof (char **));
 808                 else
 809                   offsets = xrealloc (offsets, ++count * sizeof (char **));
 810                 offsets[i] = xmalloc (2 * sizeof (char *));
 811                 offsets[i][0] = (char *)begin; /* ESC */
 812                 offsets[i][1] = (char *)end;   /* m */
 813                 i++;
 814               }
 815             DISCARD:
 816               continue;
 817           }
 818         p++;
 819       }
 820
 821     if (offsets)
 822       print_free_offsets (line, offsets, count);
 823     else
 824       printf (formats[FMT_GENERIC], line);
 825 }
 826
 827 #define SET_CHAR(offset, new, old) \
 828     *old = *offset;                \
 829     *offset = new;                 \
 830
 831 #define RESTORE_CHAR(offset, old)  \
 832     *offset = old;                 \
 833
 834 static void
 835 print_free_offsets (const char *line, char ***offsets, unsigned int count)
 836 {
 837     char ch;
 838     unsigned int i;
 839
 840     SET_CHAR (offsets[0][0], '\0', &ch);
 841     printf (formats[FMT_GENERIC], line);
 842     RESTORE_CHAR (offsets[0][0], ch);
 843
 844     for (i = 0; i < count; i++)
 845       {
 846         char ch;
 847         bool next_offset = false;
 848         if (i + 1 < count)
 849           {
 850             SET_CHAR (offsets[i + 1][0], '\0', &ch);
 851             next_offset = true;
 852           }
 853         printf (formats[FMT_GENERIC], offsets[i][1] + 1);
 854         if (next_offset)
 855           RESTORE_CHAR (offsets[i + 1][0], ch);
 856       }
 857     for (i = 0; i < count; i++)
 858       free_null (offsets[i]);
 859     free_null (offsets);
 860 }
 861
 862 static void *
 863 malloc_wrap (size_t size)
 864 {
 865     void *p = malloc (size);
 866     if (!p)
 867       MEM_ALLOC_FAIL ();
 868     return p;
 869 }
 870
 871 static void *
 872 realloc_wrap (void *ptr, size_t size)
 873 {
 874     void *p = realloc (ptr, size);
 875     if (!p)
 876       MEM_ALLOC_FAIL ();
 877     return p;
 878 }
 879
 880 static void *
 881 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
 882 {
 883     void *p = malloc (size);
 884     if (!p)
 885       MEM_ALLOC_FAIL_DEBUG (file, line);
 886     return p;
 887 }
 888
 889 static void *
 890 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
 891 {
 892     void *p = realloc (ptr, size);
 893     if (!p)
 894       MEM_ALLOC_FAIL_DEBUG (file, line);
 895     return p;
 896 }
 897
 898 static void
 899 free_wrap (void **ptr)
 900 {
 901     free (*ptr);
 902     *ptr = NULL;
 903 }
 904
 905 static char *
 906 strdup_wrap (const char *str)
 907 {
 908     const unsigned int len = strlen (str) + 1;
 909     char *p = xmalloc (len);
 910     strncpy (p, str, len);
 911     return p;
 912 }
 913
 914 static char *
 915 str_concat (const char *str1, const char *str2)
 916 {
 917     const unsigned long len = strlen (str1) + strlen (str2) + 1;
 918     char *p, *str;
 919
 920     p = str = xmalloc (len);
 921     strncpy (p, str1, strlen (str1));
 922     p += strlen (str1);
 923     strncpy (p, str2, strlen (str2));
 924     p += strlen (str2);
 925     *p = '\0';
 926
 927     return str;
 928 }
 929
 930 static void
 931 vfprintf_fail (const char *fmt, ...)
 932 {
 933     va_list ap;
 934     fprintf (stderr, "%s: ", program_name);
 935     va_start (ap, fmt);
 936     vfprintf (stderr, fmt, ap);
 937     va_end (ap);
 938     fprintf (stderr, "\n");
 939     exit (EXIT_FAILURE);
 940 }
 941
 942 static void
 943 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
 944 {
 945     /* nothing to stack */
 946     if (ptr == NULL)
 947       return;
 948     if (!*list)
 949       *list = xmalloc (sizeof (void *));
 950     else
 951       {
 952         unsigned int i;
 953         for (i = 0; i < *stacked; i++)
 954           if (!(*list)[i])
 955             {
 956               (*list)[i] = ptr;
 957               return; /* reused */
 958             }
 959         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
 960       }
 961     (*list)[index] = ptr;
 962     (*stacked)++;
 963 }
 964
 965 static void
 966 release_var (void **list, unsigned int stacked, void **ptr)
 967 {
 968     unsigned int i;
 969     /* nothing to release */
 970     if (*ptr == NULL)
 971       return;
 972     for (i = 0; i < stacked; i++)
 973       if (list[i] == *ptr)
 974         {
 975           free (*ptr);
 976           *ptr = NULL;
 977           list[i] = NULL;
 978           return;
 979         }
 980 }