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 "0.50"
  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 bool clean_all = false;
 182
 183 static char *exclude = NULL;
 184
 185 static const char *program_name;
 186
 187 static void print_help (void);
 188 static void print_version (void);
 189 static void cleanup (void);
 190 static void free_color_names (struct color_name **);
 191 static void process_options (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
 192 static void process_file_option (const char *, const char **, FILE **);
 193 static void read_print_stream (bool, const struct color **, const char *, FILE *, enum stream_mode);
 194 static void find_color_entries (struct color_name **, const struct color **);
 195 static void find_color_entry (const char *const, unsigned int, const struct color **);
 196 static void print_line (const struct color **, bool, const char * const, unsigned int);
 197 static void print_clean (const char *);
 198 static void print_free_offsets (const char *, char ***, unsigned int);
 199 static void *malloc_wrap (size_t);
 200 static void *realloc_wrap (void *, size_t);
 201 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 202 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 203 static void free_wrap (void **);
 204 static char *strdup_wrap (const char *);
 205 static char *str_concat (const char *, const char *);
 206 static void vfprintf_fail (const char *, ...);
 207 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 208 static void release_var (void **, unsigned int, void **);
 209
 210 #define SET_OPT_TYPE(type) \
 211     opt_type = type;       \
 212     opt = 0;               \
 213     goto PARSE_OPT;        \
 214
 215 extern char *optarg;
 216 extern int optind;
 217
 218 int
 219 main (int argc, char **argv)
 220 {
 221     unsigned int arg_cnt = 0;
 222
 223     enum {
 224         OPT_CLEAN = 1,
 225         OPT_CLEAN_ALL,
 226         OPT_EXCLUDE_RANDOM,
 227         OPT_HELP,
 228         OPT_VERSION
 229     };
 230
 231     int opt, opt_type = 0;
 232     struct option long_opts[] = {
 233         { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 234         { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
 235         { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 236         { "help",           no_argument,       &opt_type, OPT_HELP           },
 237         { "version",        no_argument,       &opt_type, OPT_VERSION        },
 238         {  0,               0,                 0,         0                  },
 239     };
 240
 241     bool bold = false;
 242
 243     const struct color *colors[2] = {
 244         NULL, /* foreground */
 245         NULL, /* background */
 246     };
 247
 248     const char *file;
 249
 250     enum stream_mode mode = SCAN_FIRST;
 251
 252     program_name = argv[0];
 253     atexit (cleanup);
 254
 255     setvbuf (stdout, NULL, _IOLBF, 0);
 256
 257     while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
 258       {
 259         PARSE_OPT:
 260         switch (opt)
 261           {
 262             case 0: /* long opts */
 263               switch (opt_type)
 264                 {
 265                   case OPT_CLEAN:
 266                     clean = true;
 267                     break;
 268                   case OPT_CLEAN_ALL:
 269                     clean_all = true;
 270                     break;
 271                   case OPT_EXCLUDE_RANDOM: {
 272                     char *p;
 273                     exclude = xstrdup (optarg);
 274                     STACK_VAR (exclude);
 275                     for (p = exclude; *p; p++)
 276                       *p = tolower (*p);
 277                     if (streq (exclude, "random"))
 278                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a color");
 279                     break;
 280                   }
 281                   case OPT_HELP:
 282                     print_help ();
 283                     exit (EXIT_SUCCESS);
 284                   case OPT_VERSION:
 285                     print_version ();
 286                     exit (EXIT_SUCCESS);
 287                   default: /* never reached */
 288                     ABORT_TRACE ();
 289                 }
 290               break;
 291             case 'h':
 292               SET_OPT_TYPE (OPT_HELP);
 293             case 'v':
 294               SET_OPT_TYPE (OPT_VERSION);
 295             case '?':
 296               print_help ();
 297               exit (EXIT_FAILURE);
 298             default: /* never reached */
 299               ABORT_TRACE ();
 300           }
 301       }
 302
 303     arg_cnt = argc - optind;
 304
 305     if (clean || clean_all)
 306       {
 307         if (arg_cnt > 1)
 308           {
 309             const char *format = "%s %s";
 310             const char *message = "switch cannot be used with more than one file";
 311             if (clean)
 312               vfprintf_fail (format, "--clean", message);
 313             else if (clean_all)
 314               vfprintf_fail (format, "--clean-all", message);
 315           }
 316       }
 317     else
 318       {
 319         if (arg_cnt == 0 || arg_cnt > 2)
 320           {
 321             print_help ();
 322             exit (EXIT_FAILURE);
 323           }
 324       }
 325
 326     if (clean || clean_all)
 327       process_file_option (argv[optind], &file, &stream);
 328     else
 329       process_options (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 330     read_print_stream (bold, colors, file, stream, mode);
 331
 332     RELEASE_VAR (exclude);
 333
 334     exit (EXIT_SUCCESS);
 335 }
 336
 337 static void
 338 print_help (void)
 339 {
 340     unsigned int i;
 341
 342     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 343     printf ("\tColors (foreground) (background)\n");
 344     for (i = 0; i < tables[FOREGROUND].count; i++)
 345       {
 346         const struct color *entry = &tables[FOREGROUND].entries[i];
 347         const char *name = entry->name;
 348         const char *code = entry->code;
 349         if (code)
 350           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 351                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 352         else
 353           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 354       }
 355     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 356
 357     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 358     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 359
 360     printf ("\n\tOptions\n");
 361     printf ("\t\t    --clean\n");
 362     printf ("\t\t    --clean-all\n");
 363     printf ("\t\t    --exclude-random\n");
 364     printf ("\t\t-h, --help\n");
 365     printf ("\t\t-v, --version\n\n");
 366 }
 367
 368 static void
 369 print_version (void)
 370 {
 371     const char *c_flags;
 372     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 373 #ifdef CFLAGS
 374     c_flags = to_str (CFLAGS);
 375 #else
 376     c_flags = "unknown";
 377 #endif
 378     printf ("Compiler flags: %s\n", c_flags);
 379     printf ("Buffer size: %u bytes\n", BUF_SIZE - 1);
 380 }
 381
 382 static void
 383 cleanup (void)
 384 {
 385     free_color_names (color_names);
 386
 387     if (stream && fileno (stream) != STDIN_FILENO)
 388       fclose (stream);
 389
 390     if (vars_list)
 391       {
 392         unsigned int i;
 393         for (i = 0; i < stacked_vars; i++)
 394           if (vars_list[i])
 395             free_null (vars_list[i]);
 396
 397         free_null (vars_list);
 398       }
 399 }
 400
 401 static void
 402 free_color_names (struct color_name **color_names)
 403 {
 404     unsigned int i;
 405     for (i = 0; color_names[i]; i++)
 406       {
 407         free_null (color_names[i]->name);
 408         free_null (color_names[i]->orig);
 409         free_null (color_names[i]);
 410       }
 411 }
 412
 413 static void
 414 process_options (unsigned int arg_cnt, char **option_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 415 {
 416     int ret;
 417     unsigned int index;
 418     char *color, *p, *str;
 419     struct stat sb;
 420
 421     const char *color_string = arg_cnt >= 1 ? option_strings[0] : NULL;
 422     const char *file_string  = arg_cnt == 2 ? option_strings[1] : NULL;
 423
 424     assert (color_string);
 425
 426     if (streq (color_string, "-"))
 427       {
 428         if (file_string)
 429           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 430         else
 431           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 432       }
 433
 434     ret = stat (color_string, &sb);
 435
 436     /* Ensure that we don't fail if there's a file with one or more
 437        color names in its path.  */
 438     if (ret != -1)
 439       {
 440         bool have_file;
 441         unsigned int c;
 442         const char *color = color_string;
 443
 444         for (c = 1; c <= 2 && *color; c++)
 445           {
 446             bool matched = false;
 447             unsigned int i;
 448             for (i = 0; i < tables[FOREGROUND].count; i++)
 449               {
 450                 const struct color *entry = &tables[FOREGROUND].entries[i];
 451                 char *p;
 452                 if ((p = strstr (color, entry->name)) && p == color)
 453                   {
 454                     color = p + strlen (entry->name);
 455                     matched = true;
 456                     break;
 457                   }
 458               }
 459             if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 460               color++;
 461             else
 462               break;
 463           }
 464
 465         have_file = (*color != '\0');
 466
 467         if (have_file)
 468           {
 469             if (file_string)
 470               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 471             else
 472               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 473           }
 474       }
 475
 476     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 477       {
 478         if (p == color_string)
 479           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 480         else if (p == color_string + strlen (color_string) - 1)
 481           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 482         else if (strchr (++p, COLOR_SEP_CHAR))
 483           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 484       }
 485
 486     str = xstrdup (color_string);
 487     STACK_VAR (str);
 488
 489     for (index = 0, color = str; *color; index++, color = p)
 490       {
 491         char *ch, *sep;
 492         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 493           {
 494             *sep = '\0';
 495             p = sep + 1;
 496           }
 497         else
 498           p = color + strlen (color);
 499
 500         for (ch = color; *ch; ch++)
 501           if (!isalpha (*ch))
 502             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 503
 504         for (ch = color + 1; *ch; ch++)
 505           if (!islower (*ch))
 506             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 507
 508         if (streq (color, "None"))
 509           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 510
 511         if (isupper (*color))
 512           {
 513             switch (index)
 514               {
 515                 case FOREGROUND:
 516                   *bold = true;
 517                   break;
 518                 case BACKGROUND:
 519                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 520                   break;
 521                 default: /* never reached */
 522                   ABORT_TRACE ();
 523               }
 524           }
 525
 526         color_names[index] = xmalloc (sizeof (struct color_name));
 527
 528         color_names[index]->orig = xstrdup (color);
 529
 530         for (ch = color; *ch; ch++)
 531           *ch = tolower (*ch);
 532
 533         color_names[index]->name = xstrdup (color);
 534       }
 535
 536     RELEASE_VAR (str);
 537
 538     assert (color_names[FOREGROUND]);
 539
 540     if (color_names[BACKGROUND])
 541       {
 542         unsigned int i;
 543         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 544         for (i = 0; i < 2; i++)
 545           {
 546             unsigned int color1 = color_sets[i][0];
 547             unsigned int color2 = color_sets[i][1];
 548             if (CHECK_COLORS_RANDOM (color1, color2))
 549               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 550           }
 551       }
 552
 553     find_color_entries (color_names, colors);
 554     free_color_names (color_names);
 555
 556     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 557       find_color_entry ("default", FOREGROUND, colors);
 558
 559     process_file_option (file_string, file, stream);
 560 }
 561
 562 static void
 563 process_file_option (const char *file_string, const char **file, FILE **stream)
 564 {
 565     if (file_string)
 566       {
 567         if (streq (file_string, "-"))
 568           *stream = stdin;
 569         else
 570           {
 571             FILE *s;
 572             const char *file = file_string;
 573             struct stat sb;
 574             int errno, ret;
 575
 576             errno = 0;
 577             ret = stat (file, &sb);
 578
 579             if (ret == -1)
 580               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 581
 582             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 583               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 584
 585             errno = 0;
 586
 587             s = fopen (file, "r");
 588             if (!s)
 589               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 590             *stream = s;
 591           }
 592         *file = file_string;
 593       }
 594     else
 595       {
 596         *stream = stdin;
 597         *file = "stdin";
 598       }
 599
 600     assert (*stream);
 601 }
 602
 603 #define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
 604     char *current_line, *merged_line = NULL;                     \
 605     if (part_line)                                               \
 606       {                                                          \
 607         merged_line = str_concat (part_line, line);              \
 608         free_null (part_line);                                   \
 609       }                                                          \
 610     current_line = merged_line ? merged_line : (char *)line;     \
 611     if (!check_eof || *current_line != '\0')                     \
 612       print_line (colors, bold, current_line, flags);            \
 613     free (merged_line);                                          \
 614 } while (false);
 615
 616 static void
 617 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream, enum stream_mode mode)
 618 {
 619     char buf[BUF_SIZE], *part_line = NULL;
 620     unsigned int flags = 0;
 621     bool first = false, always = false;
 622
 623     switch (mode)
 624       {
 625         case SCAN_FIRST:
 626           first = true;
 627           break;
 628         case SCAN_ALWAYS:
 629           always = true;
 630           break;
 631         default: /* never reached */
 632           ABORT_TRACE ();
 633       }
 634
 635     while (!feof (stream))
 636       {
 637         size_t bytes_read;
 638         char *eol;
 639         const char *line;
 640         memset (buf, '\0', BUF_SIZE);
 641         bytes_read = fread (buf, 1, BUF_SIZE - 1, stream);
 642         if (bytes_read != (BUF_SIZE - 1) && ferror (stream))
 643           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE - 1, "read");
 644         line = buf;
 645         LOOP: while ((eol = strpbrk (line, "\n\r")))
 646           {
 647             char *p;
 648             if (first || always)
 649               {
 650                 first = false;
 651                 flags &= ~(CR|LF);
 652                 if (*eol == '\r')
 653                   {
 654                     flags |= CR;
 655                     if (*(eol + 1) == '\n')
 656                       flags |= LF;
 657                   }
 658                 else if (*eol == '\n')
 659                   flags |= LF;
 660                 else
 661                   vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 662               }
 663             if (always)
 664               p = eol + SKIP_LINE_ENDINGS (flags);
 665             else /* first */
 666               {
 667                 unsigned int i;
 668                 unsigned int count = sizeof (endings) / sizeof (struct ending);
 669                 for (i = 0; i < count; i++)
 670                   {
 671                     if (flags & endings[i].flags)
 672                       {
 673                         char *p;
 674                         if ((p = strstr (eol, endings[i].newline)) && p == eol)
 675                           break;
 676                         else
 677                           {
 678                             always = true;
 679                             goto LOOP;
 680                           }
 681                       }
 682                   }
 683                 p = eol + SKIP_LINE_ENDINGS (flags);
 684               }
 685             *eol = '\0';
 686             MERGE_PRINT_LINE (part_line, line, flags, false);
 687             line = p;
 688           }
 689         if (feof (stream)) {
 690           MERGE_PRINT_LINE (part_line, line, 0, true);
 691         }
 692         else
 693           {
 694             if (!clean && !clean_all) /* efficiency */
 695               print_line (colors, bold, line, 0);
 696             else if (!part_line)
 697               part_line = xstrdup (line);
 698             else
 699               {
 700                 char *merged_line = str_concat (part_line, line);
 701                 free (part_line);
 702                 part_line = merged_line;
 703               }
 704           }
 705       }
 706 }
 707
 708 static void
 709 find_color_entries (struct color_name **color_names, const struct color **colors)
 710 {
 711     struct timeval tv;
 712     unsigned int index;
 713
 714     /* randomness */
 715     gettimeofday (&tv, NULL);
 716     srand (tv.tv_usec * tv.tv_sec);
 717
 718     for (index = 0; color_names[index]; index++)
 719       {
 720         const char *color_name = color_names[index]->name;
 721
 722         const unsigned int count                = tables[index].count;
 723         const struct color *const color_entries = tables[index].entries;
 724
 725         if (streq (color_name, "random"))
 726           {
 727             bool excludable;
 728             unsigned int i;
 729             do {
 730               excludable = false;
 731               i = rand() % (count - 2) + 1; /* omit color none and default */
 732               switch (index)
 733                 {
 734                   case FOREGROUND:
 735                     /* --exclude-random */
 736                     if (exclude && streq (exclude, color_entries[i].name))
 737                       excludable = true;
 738                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 739                       excludable = true;
 740                     break;
 741                   case BACKGROUND:
 742                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 743                       excludable = true;
 744                     break;
 745                   default: /* never reached */
 746                     ABORT_TRACE ();
 747                  }
 748             } while (excludable);
 749             colors[index] = (struct color *)&color_entries[i];
 750           }
 751         else
 752           find_color_entry (color_name, index, colors);
 753       }
 754 }
 755
 756 static void
 757 find_color_entry (const char *const color_name, unsigned int index, const struct color **colors)
 758 {
 759     bool found = false;
 760     unsigned int i;
 761
 762     const unsigned int count                = tables[index].count;
 763     const struct color *const color_entries = tables[index].entries;
 764
 765     for (i = 0; i < count; i++)
 766       if (streq (color_name, color_entries[i].name))
 767         {
 768           colors[index] = (struct color *)&color_entries[i];
 769           found = true;
 770           break;
 771         }
 772     if (!found)
 773       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name, "not recognized");
 774 }
 775
 776 static void
 777 print_line (const struct color **colors, bool bold, const char *const line, unsigned int flags)
 778 {
 779     /* --clean[-all] */
 780     if (clean || clean_all)
 781       print_clean (line);
 782     else
 783       {
 784         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 785           printf ("\033[%s", colors[BACKGROUND]->code);
 786         if (colors[FOREGROUND]->code)
 787           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 788         else
 789           printf (formats[FMT_GENERIC], line);
 790       }
 791     if (flags & CR)
 792       putchar ('\r');
 793     if (flags & LF)
 794       putchar ('\n');
 795 }
 796
 797 static void
 798 print_clean (const char *line)
 799 {
 800     const char *p;
 801     char ***offsets = NULL;
 802     unsigned int count = 0, i = 0;
 803
 804     for (p = line; *p;)
 805       {
 806         /* ESC[ */
 807         if (*p == 27 && *(p + 1) == '[')
 808           {
 809             const char *begin = p;
 810             p += 2;
 811             if (clean_all)
 812               {
 813                 while (isdigit (*p) || *p == ';')
 814                   p++;
 815               }
 816             else if (clean)
 817               {
 818                 bool check_values, first = true;
 819                 if (!isdigit (*p))
 820                   goto END;
 821                 do {
 822                   const char *digit;
 823                   check_values = false;
 824                   if (!first && !isdigit (*p))
 825                     goto DISCARD;
 826                   digit = p;
 827                   while (isdigit (*p))
 828                     p++;
 829                   if (p - digit > 2)
 830                     goto DISCARD;
 831                   else /* check range */
 832                     {
 833                       char val[3];
 834                       int value;
 835                       unsigned int i;
 836                       const unsigned int digits = p - digit;
 837                       for (i = 0; i < digits; i++)
 838                         val[i] = *digit++;
 839                       val[i] = '\0';
 840                       value = atoi (val);
 841                       if (!((value ==  0 || value ==  1)   /* attributes        */
 842                          || (value >= 30 && value <= 37)   /* foreground colors */
 843                          || (value >= 40 && value <= 47)   /* background colors */
 844                          || (value == 39 || value == 49))) /* default colors    */
 845                         goto DISCARD;
 846                     }
 847                   if (*p == ';')
 848                     {
 849                       p++;
 850                       check_values = true;
 851                     }
 852                   first = false;
 853                 } while (check_values);
 854               }
 855             END: if (*p == 'm')
 856               {
 857                 const char *end = p++;
 858                 if (!offsets)
 859                   offsets = xmalloc (++count * sizeof (char **));
 860                 else
 861                   offsets = xrealloc (offsets, ++count * sizeof (char **));
 862                 offsets[i] = xmalloc (2 * sizeof (char *));
 863                 offsets[i][0] = (char *)begin; /* ESC */
 864                 offsets[i][1] = (char *)end;   /* m */
 865                 i++;
 866                 continue;
 867               }
 868             DISCARD:
 869               continue;
 870           }
 871         p++;
 872       }
 873
 874     if (offsets)
 875       print_free_offsets (line, offsets, count);
 876     else
 877       printf (formats[FMT_GENERIC], line);
 878 }
 879
 880 #define SET_CHAR(offset, new, old) \
 881     *old = *offset;                \
 882     *offset = new;                 \
 883
 884 #define RESTORE_CHAR(offset, old)  \
 885     *offset = old;                 \
 886
 887 static void
 888 print_free_offsets (const char *line, char ***offsets, unsigned int count)
 889 {
 890     char ch;
 891     unsigned int i;
 892
 893     SET_CHAR (offsets[0][0], '\0', &ch);
 894     printf (formats[FMT_GENERIC], line);
 895     RESTORE_CHAR (offsets[0][0], ch);
 896
 897     for (i = 0; i < count; i++)
 898       {
 899         char ch;
 900         bool next_offset = false;
 901         if (i + 1 < count)
 902           {
 903             SET_CHAR (offsets[i + 1][0], '\0', &ch);
 904             next_offset = true;
 905           }
 906         printf (formats[FMT_GENERIC], offsets[i][1] + 1);
 907         if (next_offset)
 908           RESTORE_CHAR (offsets[i + 1][0], ch);
 909       }
 910     for (i = 0; i < count; i++)
 911       free_null (offsets[i]);
 912     free_null (offsets);
 913 }
 914
 915 static void *
 916 malloc_wrap (size_t size)
 917 {
 918     void *p = malloc (size);
 919     if (!p)
 920       MEM_ALLOC_FAIL ();
 921     return p;
 922 }
 923
 924 static void *
 925 realloc_wrap (void *ptr, size_t size)
 926 {
 927     void *p = realloc (ptr, size);
 928     if (!p)
 929       MEM_ALLOC_FAIL ();
 930     return p;
 931 }
 932
 933 static void *
 934 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
 935 {
 936     void *p = malloc (size);
 937     if (!p)
 938       MEM_ALLOC_FAIL_DEBUG (file, line);
 939     return p;
 940 }
 941
 942 static void *
 943 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
 944 {
 945     void *p = realloc (ptr, size);
 946     if (!p)
 947       MEM_ALLOC_FAIL_DEBUG (file, line);
 948     return p;
 949 }
 950
 951 static void
 952 free_wrap (void **ptr)
 953 {
 954     free (*ptr);
 955     *ptr = NULL;
 956 }
 957
 958 static char *
 959 strdup_wrap (const char *str)
 960 {
 961     const size_t len = strlen (str) + 1;
 962     char *p = xmalloc (len);
 963     strncpy (p, str, len);
 964     return p;
 965 }
 966
 967 static char *
 968 str_concat (const char *str1, const char *str2)
 969 {
 970     const size_t len = strlen (str1) + strlen (str2) + 1;
 971     char *p, *str;
 972
 973     p = str = xmalloc (len);
 974     strncpy (p, str1, strlen (str1));
 975     p += strlen (str1);
 976     strncpy (p, str2, strlen (str2));
 977     p += strlen (str2);
 978     *p = '\0';
 979
 980     return str;
 981 }
 982
 983 static void
 984 vfprintf_fail (const char *fmt, ...)
 985 {
 986     va_list ap;
 987     fprintf (stderr, "%s: ", program_name);
 988     va_start (ap, fmt);
 989     vfprintf (stderr, fmt, ap);
 990     va_end (ap);
 991     fprintf (stderr, "\n");
 992     exit (EXIT_FAILURE);
 993 }
 994
 995 static void
 996 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
 997 {
 998     /* nothing to stack */
 999     if (ptr == NULL)
1000       return;
1001     if (!*list)
1002       *list = xmalloc (sizeof (void *));
1003     else
1004       {
1005         unsigned int i;
1006         for (i = 0; i < *stacked; i++)
1007           if (!(*list)[i])
1008             {
1009               (*list)[i] = ptr;
1010               return; /* reused */
1011             }
1012         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1013       }
1014     (*list)[index] = ptr;
1015     (*stacked)++;
1016 }
1017
1018 static void
1019 release_var (void **list, unsigned int stacked, void **ptr)
1020 {
1021     unsigned int i;
1022     /* nothing to release */
1023     if (*ptr == NULL)
1024       return;
1025     for (i = 0; i < stacked; i++)
1026       if (list[i] == *ptr)
1027         {
1028           free (*ptr);
1029           *ptr = NULL;
1030           list[i] = NULL;
1031           return;
1032         }
1033 }