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 %u\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 %u\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 COLOR_SEP_CHAR '/'
  92
  93 #define VERSION "0.49"
  94
  95 typedef unsigned short bool;
  96
  97 enum { false, true };
  98
  99 struct color_name {
 100     char *name;
 101     char *orig;
 102 };
 103
 104 static struct color_name *color_names[3] = { NULL, NULL, NULL };
 105
 106 struct color {
 107     const char *name;
 108     const char *code;
 109 };
 110
 111 static const struct color fg_colors[] = {
 112     { "none",     NULL },
 113     { "black",   "30m" },
 114     { "red",     "31m" },
 115     { "green",   "32m" },
 116     { "yellow",  "33m" },
 117     { "blue",    "34m" },
 118     { "cyan",    "35m" },
 119     { "magenta", "36m" },
 120     { "white",   "37m" },
 121     { "default", "39m" },
 122 };
 123 static const struct color bg_colors[] = {
 124     { "none",     NULL },
 125     { "black",   "40m" },
 126     { "red",     "41m" },
 127     { "green",   "42m" },
 128     { "yellow",  "43m" },
 129     { "blue",    "44m" },
 130     { "cyan",    "45m" },
 131     { "magenta", "46m" },
 132     { "white",   "47m" },
 133     { "default", "49m" },
 134 };
 135
 136 enum fmts {
 137     FMT_GENERIC,
 138     FMT_COLOR,
 139     FMT_RANDOM,
 140     FMT_ERROR,
 141     FMT_FILE
 142 };
 143 static const char *formats[] = {
 144     "%s",                    /* generic */
 145     "%s color '%s' %s",      /* color   */
 146     "%s color '%s' %s '%s'", /* random  */
 147     "less than %u bytes %s", /* error   */
 148     "%s: %s",                /* file    */
 149 };
 150
 151 enum { FOREGROUND, BACKGROUND };
 152
 153 static const struct {
 154     struct color const *entries;
 155     unsigned int count;
 156     const char *desc;
 157 } tables[] = {
 158     { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
 159     { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
 160 };
 161
 162 enum stream_mode { SCAN_FIRST = 1, SCAN_ALWAYS };
 163
 164 struct ending {
 165     unsigned int flags;
 166     const char newline[3];
 167 };
 168
 169 static const struct ending endings[] = {
 170     { CR & LF, "\r\n" },
 171     { CR,      "\r"   },
 172     { LF,      "\n"   },
 173 };
 174
 175 static FILE *stream = NULL;
 176
 177 static unsigned int stacked_vars = 0;
 178 static void **vars_list = NULL;
 179
 180 static bool clean = false;
 181 static char *exclude = NULL;
 182
 183 static const char *program_name;
 184
 185 static void print_help (void);
 186 static void print_version (void);
 187 static void cleanup (void);
 188 static void free_color_names (struct color_name **);
 189 static void process_options (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
 190 static void process_file_option (const char *, const char **, FILE **);
 191 static void read_print_stream (bool, const struct color **, const char *, FILE *, enum stream_mode);
 192 static void find_color_entries (struct color_name **, const struct color **);
 193 static void find_color_entry (const char *const, unsigned int, const struct color **);
 194 static void print_line (const struct color **, bool, const char * const, unsigned int);
 195 static void print_clean (const char *);
 196 static void print_free_offsets (const char *, char ***, unsigned int);
 197 static void *malloc_wrap (size_t);
 198 static void *realloc_wrap (void *, size_t);
 199 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 200 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 201 static void free_wrap (void **);
 202 static char *strdup_wrap (const char *);
 203 static char *str_concat (const char *, const char *);
 204 static void vfprintf_fail (const char *, ...);
 205 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 206 static void release_var (void **, unsigned int, void **);
 207
 208 extern char *optarg;
 209 extern int optind;
 210
 211 int
 212 main (int argc, char **argv)
 213 {
 214     unsigned int arg_cnt = 0;
 215
 216     enum {
 217         OPT_CLEAN = 1,
 218         OPT_EXCLUDE_RANDOM,
 219         OPT_HELP,
 220         OPT_VERSION
 221     };
 222
 223     int opt, opt_type = 0;
 224     struct option long_opts[] = {
 225         { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 226         { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 227         { "help",           no_argument,       &opt_type, OPT_HELP           },
 228         { "version",        no_argument,       &opt_type, OPT_VERSION        },
 229         {  0,               0,                 0,         0                  },
 230     };
 231
 232     bool bold = false;
 233
 234     const struct color *colors[2] = {
 235         NULL, /* foreground */
 236         NULL, /* background */
 237     };
 238
 239     const char *file;
 240
 241     enum stream_mode mode = SCAN_FIRST;
 242
 243     program_name = argv[0];
 244     atexit (cleanup);
 245
 246     setvbuf (stdout, NULL, _IOLBF, 0);
 247
 248     while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
 249       {
 250         PARSE_OPT:
 251         switch (opt)
 252           {
 253             case 0: /* long opts */
 254               switch (opt_type)
 255                 {
 256                   case OPT_CLEAN:
 257                     clean = true;
 258                     break;
 259                   case OPT_EXCLUDE_RANDOM: {
 260                     char *p;
 261                     exclude = xstrdup (optarg);
 262                     STACK_VAR (exclude);
 263                     for (p = exclude; *p; p++)
 264                       *p = tolower (*p);
 265                     if (streq (exclude, "random"))
 266                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a color");
 267                     break;
 268                   }
 269                   case OPT_HELP:
 270                     print_help ();
 271                     exit (EXIT_SUCCESS);
 272                   case OPT_VERSION:
 273                     print_version ();
 274                     exit (EXIT_SUCCESS);
 275                   default: /* never reached */
 276                     ABORT_TRACE ();
 277                 }
 278               break;
 279             case 'h':
 280               opt_type = OPT_HELP;
 281               opt = 0;
 282               goto PARSE_OPT;
 283             case 'v':
 284               opt_type = OPT_VERSION;
 285               opt = 0;
 286               goto PARSE_OPT;
 287             case '?':
 288               print_help ();
 289               exit (EXIT_FAILURE);
 290             default: /* never reached */
 291               ABORT_TRACE ();
 292           }
 293       }
 294
 295     arg_cnt = argc - optind;
 296
 297     if (clean)
 298       {
 299         if (arg_cnt > 1)
 300           vfprintf_fail (formats[FMT_GENERIC], "--clean switch cannot be used with more than one file");
 301       }
 302     else
 303       {
 304         if (arg_cnt == 0 || arg_cnt > 2)
 305           {
 306             print_help ();
 307             exit (EXIT_FAILURE);
 308           }
 309       }
 310
 311     if (clean)
 312       process_file_option (argv[optind], &file, &stream);
 313     else
 314       process_options (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 315     read_print_stream (bold, colors, file, stream, mode);
 316
 317     RELEASE_VAR (exclude);
 318
 319     exit (EXIT_SUCCESS);
 320 }
 321
 322 static void
 323 print_help (void)
 324 {
 325     unsigned int i;
 326
 327     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 328     printf ("\tColors (foreground) (background)\n");
 329     for (i = 0; i < tables[FOREGROUND].count; i++)
 330       {
 331         const struct color *entry = &tables[FOREGROUND].entries[i];
 332         const char *name = entry->name;
 333         const char *code = entry->code;
 334         if (code)
 335           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 336                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 337         else
 338           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 339       }
 340     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 341
 342     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 343     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 344
 345     printf ("\n\tOptions\n");
 346     printf ("\t\t    --clean\n");
 347     printf ("\t\t    --exclude-random\n");
 348     printf ("\t\t-h, --help\n");
 349     printf ("\t\t-v, --version\n\n");
 350 }
 351
 352 static void
 353 print_version (void)
 354 {
 355     const char *c_flags;
 356     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 357 #ifdef CFLAGS
 358     c_flags = to_str (CFLAGS);
 359 #else
 360     c_flags = "unknown";
 361 #endif
 362     printf ("Compiler flags: %s\n", c_flags);
 363     printf ("Buffer size: %u bytes\n", BUF_SIZE - 1);
 364 }
 365
 366 static void
 367 cleanup (void)
 368 {
 369     free_color_names (color_names);
 370
 371     if (stream && fileno (stream) != STDIN_FILENO)
 372       fclose (stream);
 373
 374     if (vars_list)
 375       {
 376         unsigned int i;
 377         for (i = 0; i < stacked_vars; i++)
 378           if (vars_list[i])
 379             free_null (vars_list[i]);
 380
 381         free_null (vars_list);
 382       }
 383 }
 384
 385 static void
 386 free_color_names (struct color_name **color_names)
 387 {
 388     unsigned int i;
 389     for (i = 0; color_names[i]; i++)
 390       {
 391         free_null (color_names[i]->name);
 392         free_null (color_names[i]->orig);
 393         free_null (color_names[i]);
 394       }
 395 }
 396
 397 static void
 398 process_options (unsigned int arg_cnt, char **option_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 399 {
 400     int ret;
 401     unsigned int index;
 402     char *color, *p, *str;
 403     struct stat sb;
 404
 405     const char *color_string = arg_cnt >= 1 ? option_strings[0] : NULL;
 406     const char *file_string  = arg_cnt == 2 ? option_strings[1] : NULL;
 407
 408     assert (color_string);
 409
 410     if (streq (color_string, "-"))
 411       {
 412         if (file_string)
 413           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 414         else
 415           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 416       }
 417
 418     ret = stat (color_string, &sb);
 419
 420     /* Ensure that we don't fail if there's a file with one or more
 421        color names in its path.  */
 422     if (ret != -1)
 423       {
 424         bool have_file;
 425         unsigned int c;
 426         const char *color = color_string;
 427
 428         for (c = 1; c <= 2 && *color; c++)
 429           {
 430             bool matched = false;
 431             unsigned int i;
 432             for (i = 0; i < tables[FOREGROUND].count; i++)
 433               {
 434                 const struct color *entry = &tables[FOREGROUND].entries[i];
 435                 char *p;
 436                 if ((p = strstr (color, entry->name)) && p == color)
 437                   {
 438                     color = p + strlen (entry->name);
 439                     matched = true;
 440                     break;
 441                   }
 442               }
 443             if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 444               color++;
 445             else
 446               break;
 447           }
 448
 449         have_file = (*color != '\0');
 450
 451         if (have_file)
 452           {
 453             if (file_string)
 454               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 455             else
 456               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 457           }
 458       }
 459
 460     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 461       {
 462         if (p == color_string)
 463           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 464         else if (p == color_string + strlen (color_string) - 1)
 465           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 466         else if (strchr (++p, COLOR_SEP_CHAR))
 467           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 468       }
 469
 470     str = xstrdup (color_string);
 471     STACK_VAR (str);
 472
 473     for (index = 0, color = str; *color; index++, color = p)
 474       {
 475         char *ch, *sep;
 476         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 477           {
 478             *sep = '\0';
 479             p = sep + 1;
 480           }
 481         else
 482           p = color + strlen (color);
 483
 484         for (ch = color; *ch; ch++)
 485           if (!isalpha (*ch))
 486             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 487
 488         for (ch = color + 1; *ch; ch++)
 489           if (!islower (*ch))
 490             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 491
 492         if (streq (color, "None"))
 493           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 494
 495         if (isupper (*color))
 496           {
 497             switch (index)
 498               {
 499                 case FOREGROUND:
 500                   *bold = true;
 501                   break;
 502                 case BACKGROUND:
 503                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 504                   break;
 505                 default: /* never reached */
 506                   ABORT_TRACE ();
 507               }
 508           }
 509
 510         color_names[index] = xmalloc (sizeof (struct color_name));
 511
 512         color_names[index]->orig = xstrdup (color);
 513
 514         for (ch = color; *ch; ch++)
 515           *ch = tolower (*ch);
 516
 517         color_names[index]->name = xstrdup (color);
 518       }
 519
 520     RELEASE_VAR (str);
 521
 522     assert (color_names[FOREGROUND]);
 523
 524     if (color_names[BACKGROUND])
 525       {
 526         unsigned int i;
 527         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 528         for (i = 0; i < 2; i++)
 529           {
 530             unsigned int color1 = color_sets[i][0];
 531             unsigned int color2 = color_sets[i][1];
 532             if (CHECK_COLORS_RANDOM (color1, color2))
 533               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 534           }
 535       }
 536
 537     find_color_entries (color_names, colors);
 538     free_color_names (color_names);
 539
 540     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 541       find_color_entry ("default", FOREGROUND, colors);
 542
 543     process_file_option (file_string, file, stream);
 544 }
 545
 546 static void
 547 process_file_option (const char *file_string, const char **file, FILE **stream)
 548 {
 549     if (file_string)
 550       {
 551         if (streq (file_string, "-"))
 552           *stream = stdin;
 553         else
 554           {
 555             FILE *s;
 556             const char *file = file_string;
 557             struct stat sb;
 558             int errno, ret;
 559
 560             errno = 0;
 561             ret = stat (file, &sb);
 562
 563             if (ret == -1)
 564               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 565
 566             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 567               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 568
 569             errno = 0;
 570
 571             s = fopen (file, "r");
 572             if (!s)
 573               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 574             *stream = s;
 575           }
 576         *file = file_string;
 577       }
 578     else
 579       {
 580         *stream = stdin;
 581         *file = "stdin";
 582       }
 583
 584     assert (*stream);
 585 }
 586
 587 #define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
 588     char *current_line, *merged_line = NULL;                     \
 589     if (part_line)                                               \
 590       {                                                          \
 591         merged_line = str_concat (part_line, line);              \
 592         free_null (part_line);                                   \
 593       }                                                          \
 594     current_line = merged_line ? merged_line : (char *)line;     \
 595     if (!check_eof || *current_line != '\0')                     \
 596       print_line (colors, bold, current_line, flags);            \
 597     free (merged_line);                                          \
 598 } while (false);
 599
 600 static void
 601 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream, enum stream_mode mode)
 602 {
 603     char buf[BUF_SIZE], *part_line = NULL;
 604     unsigned int flags = 0;
 605     bool first = false, always = false;
 606
 607     switch (mode)
 608       {
 609         case SCAN_FIRST:
 610           first = true;
 611           break;
 612         case SCAN_ALWAYS:
 613           always = true;
 614           break;
 615         default: /* never reached */
 616           ABORT_TRACE ();
 617       }
 618
 619     while (!feof (stream))
 620       {
 621         size_t bytes_read;
 622         char *eol;
 623         const char *line;
 624         memset (buf, '\0', BUF_SIZE);
 625         bytes_read = fread (buf, 1, BUF_SIZE - 1, stream);
 626         if (bytes_read != (BUF_SIZE - 1) && ferror (stream))
 627           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE - 1, "read");
 628         line = buf;
 629         LOOP: while ((eol = strpbrk (line, "\n\r")))
 630           {
 631             char *p;
 632             if (first || always)
 633               {
 634                 first = false;
 635                 flags &= ~(CR|LF);
 636                 if (*eol == '\r')
 637                   {
 638                     flags |= CR;
 639                     if (*(eol + 1) == '\n')
 640                       flags |= LF;
 641                   }
 642                 else if (*eol == '\n')
 643                   flags |= LF;
 644                 else
 645                   vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 646               }
 647             if (always)
 648               p = eol + SKIP_LINE_ENDINGS (flags);
 649             else /* first */
 650               {
 651                 unsigned int i;
 652                 unsigned int count = sizeof (endings) / sizeof (struct ending);
 653                 for (i = 0; i < count; i++)
 654                   {
 655                     if (flags & endings[i].flags)
 656                       {
 657                         char *p;
 658                         if ((p = strstr (eol, endings[i].newline)) && p == eol)
 659                           break;
 660                         else
 661                           {
 662                             always = true;
 663                             goto LOOP;
 664                           }
 665                       }
 666                   }
 667                 p = eol + SKIP_LINE_ENDINGS (flags);
 668               }
 669             *eol = '\0';
 670             MERGE_PRINT_LINE (part_line, line, flags, false);
 671             line = p;
 672           }
 673         if (feof (stream)) {
 674           MERGE_PRINT_LINE (part_line, line, 0, true);
 675         }
 676         else
 677           {
 678             if (!clean) /* efficiency */
 679               print_line (colors, bold, line, 0);
 680             else if (!part_line)
 681               part_line = xstrdup (line);
 682             else
 683               {
 684                 char *merged_line = str_concat (part_line, line);
 685                 free (part_line);
 686                 part_line = merged_line;
 687               }
 688           }
 689       }
 690 }
 691
 692 static void
 693 find_color_entries (struct color_name **color_names, const struct color **colors)
 694 {
 695     struct timeval tv;
 696     unsigned int index;
 697
 698     /* randomness */
 699     gettimeofday (&tv, NULL);
 700     srand (tv.tv_usec * tv.tv_sec);
 701
 702     for (index = 0; color_names[index]; index++)
 703       {
 704         const char *color_name = color_names[index]->name;
 705
 706         const unsigned int count                = tables[index].count;
 707         const struct color *const color_entries = tables[index].entries;
 708
 709         if (streq (color_name, "random"))
 710           {
 711             bool excludable;
 712             unsigned int i;
 713             do {
 714               excludable = false;
 715               i = rand() % (count - 2) + 1; /* omit color none and default */
 716               switch (index)
 717                 {
 718                   case FOREGROUND:
 719                     /* --exclude-random */
 720                     if (exclude && streq (exclude, color_entries[i].name))
 721                       excludable = true;
 722                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 723                       excludable = true;
 724                     break;
 725                   case BACKGROUND:
 726                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 727                       excludable = true;
 728                     break;
 729                   default: /* never reached */
 730                     ABORT_TRACE ();
 731                  }
 732             } while (excludable);
 733             colors[index] = (struct color *)&color_entries[i];
 734           }
 735         else
 736           find_color_entry (color_name, index, colors);
 737       }
 738 }
 739
 740 static void
 741 find_color_entry (const char *const color_name, unsigned int index, const struct color **colors)
 742 {
 743     bool found = false;
 744     unsigned int i;
 745
 746     const unsigned int count                = tables[index].count;
 747     const struct color *const color_entries = tables[index].entries;
 748
 749     for (i = 0; i < count; i++)
 750       if (streq (color_name, color_entries[i].name))
 751         {
 752           colors[index] = (struct color *)&color_entries[i];
 753           found = true;
 754           break;
 755         }
 756     if (!found)
 757       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name, "not recognized");
 758 }
 759
 760 static void
 761 print_line (const struct color **colors, bool bold, const char *const line, unsigned int flags)
 762 {
 763     /* --clean */
 764     if (clean)
 765       print_clean (line);
 766     else
 767       {
 768         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 769           printf ("\033[%s", colors[BACKGROUND]->code);
 770         if (colors[FOREGROUND]->code)
 771           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 772         else
 773           printf (formats[FMT_GENERIC], line);
 774       }
 775     if (flags & CR)
 776       putchar ('\r');
 777     if (flags & LF)
 778       putchar ('\n');
 779 }
 780
 781 static void
 782 print_clean (const char *line)
 783 {
 784     const char *p;
 785     char ***offsets = NULL;
 786     unsigned int count = 0, i = 0;
 787
 788     for (p = line; *p;)
 789       {
 790         /* ESC[ */
 791         if (*p == 27 && *(p + 1) == '[')
 792           {
 793             bool check_values, first = true;
 794             const char *begin = p;
 795             p += 2;
 796             if (!isdigit (*p))
 797               goto END;
 798             do {
 799               const char *digit;
 800               check_values = false;
 801               if (!first && !isdigit (*p))
 802                 goto DISCARD;
 803               digit = p;
 804               while (isdigit (*p))
 805                 p++;
 806               if (p - digit > 2)
 807                 goto DISCARD;
 808               else /* check range */
 809                 {
 810                   char val[3];
 811                   int value;
 812                   unsigned int i;
 813                   const unsigned int digits = p - digit;
 814                   for (i = 0; i < digits; i++)
 815                     val[i] = *digit++;
 816                   val[i] = '\0';
 817                   value = atoi (val);
 818                   if (!((value >=  0 && value <=  8)   /* attributes        */
 819                      || (value >= 30 && value <= 37)   /* foreground colors */
 820                      || (value >= 40 && value <= 47)   /* background colors */
 821                      || (value == 39 || value == 49))) /* default colors    */
 822                     goto DISCARD;
 823                 }
 824               if (*p == ';')
 825                 {
 826                   p++;
 827                   check_values = true;
 828                 }
 829               first = false;
 830             } while (check_values);
 831             END: if (*p == 'm')
 832               {
 833                 const char *end = p++;
 834                 if (!offsets)
 835                   offsets = xmalloc (++count * sizeof (char **));
 836                 else
 837                   offsets = xrealloc (offsets, ++count * sizeof (char **));
 838                 offsets[i] = xmalloc (2 * sizeof (char *));
 839                 offsets[i][0] = (char *)begin; /* ESC */
 840                 offsets[i][1] = (char *)end;   /* m */
 841                 i++;
 842                 continue;
 843               }
 844             DISCARD:
 845               continue;
 846           }
 847         p++;
 848       }
 849
 850     if (offsets)
 851       print_free_offsets (line, offsets, count);
 852     else
 853       printf (formats[FMT_GENERIC], line);
 854 }
 855
 856 #define SET_CHAR(offset, new, old) \
 857     *old = *offset;                \
 858     *offset = new;                 \
 859
 860 #define RESTORE_CHAR(offset, old)  \
 861     *offset = old;                 \
 862
 863 static void
 864 print_free_offsets (const char *line, char ***offsets, unsigned int count)
 865 {
 866     char ch;
 867     unsigned int i;
 868
 869     SET_CHAR (offsets[0][0], '\0', &ch);
 870     printf (formats[FMT_GENERIC], line);
 871     RESTORE_CHAR (offsets[0][0], ch);
 872
 873     for (i = 0; i < count; i++)
 874       {
 875         char ch;
 876         bool next_offset = false;
 877         if (i + 1 < count)
 878           {
 879             SET_CHAR (offsets[i + 1][0], '\0', &ch);
 880             next_offset = true;
 881           }
 882         printf (formats[FMT_GENERIC], offsets[i][1] + 1);
 883         if (next_offset)
 884           RESTORE_CHAR (offsets[i + 1][0], ch);
 885       }
 886     for (i = 0; i < count; i++)
 887       free_null (offsets[i]);
 888     free_null (offsets);
 889 }
 890
 891 static void *
 892 malloc_wrap (size_t size)
 893 {
 894     void *p = malloc (size);
 895     if (!p)
 896       MEM_ALLOC_FAIL ();
 897     return p;
 898 }
 899
 900 static void *
 901 realloc_wrap (void *ptr, size_t size)
 902 {
 903     void *p = realloc (ptr, size);
 904     if (!p)
 905       MEM_ALLOC_FAIL ();
 906     return p;
 907 }
 908
 909 static void *
 910 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
 911 {
 912     void *p = malloc (size);
 913     if (!p)
 914       MEM_ALLOC_FAIL_DEBUG (file, line);
 915     return p;
 916 }
 917
 918 static void *
 919 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
 920 {
 921     void *p = realloc (ptr, size);
 922     if (!p)
 923       MEM_ALLOC_FAIL_DEBUG (file, line);
 924     return p;
 925 }
 926
 927 static void
 928 free_wrap (void **ptr)
 929 {
 930     free (*ptr);
 931     *ptr = NULL;
 932 }
 933
 934 static char *
 935 strdup_wrap (const char *str)
 936 {
 937     const size_t len = strlen (str) + 1;
 938     char *p = xmalloc (len);
 939     strncpy (p, str, len);
 940     return p;
 941 }
 942
 943 static char *
 944 str_concat (const char *str1, const char *str2)
 945 {
 946     const size_t len = strlen (str1) + strlen (str2) + 1;
 947     char *p, *str;
 948
 949     p = str = xmalloc (len);
 950     strncpy (p, str1, strlen (str1));
 951     p += strlen (str1);
 952     strncpy (p, str2, strlen (str2));
 953     p += strlen (str2);
 954     *p = '\0';
 955
 956     return str;
 957 }
 958
 959 static void
 960 vfprintf_fail (const char *fmt, ...)
 961 {
 962     va_list ap;
 963     fprintf (stderr, "%s: ", program_name);
 964     va_start (ap, fmt);
 965     vfprintf (stderr, fmt, ap);
 966     va_end (ap);
 967     fprintf (stderr, "\n");
 968     exit (EXIT_FAILURE);
 969 }
 970
 971 static void
 972 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
 973 {
 974     /* nothing to stack */
 975     if (ptr == NULL)
 976       return;
 977     if (!*list)
 978       *list = xmalloc (sizeof (void *));
 979     else
 980       {
 981         unsigned int i;
 982         for (i = 0; i < *stacked; i++)
 983           if (!(*list)[i])
 984             {
 985               (*list)[i] = ptr;
 986               return; /* reused */
 987             }
 988         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
 989       }
 990     (*list)[index] = ptr;
 991     (*stacked)++;
 992 }
 993
 994 static void
 995 release_var (void **list, unsigned int stacked, void **ptr)
 996 {
 997     unsigned int i;
 998     /* nothing to release */
 999     if (*ptr == NULL)
1000       return;
1001     for (i = 0; i < stacked; i++)
1002       if (list[i] == *ptr)
1003         {
1004           free (*ptr);
1005           *ptr = NULL;
1006           list[i] = NULL;
1007           return;
1008         }
1009 }