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