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_C_SOURCE 200809L
  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 #ifndef DEBUG
  38 # define DEBUG 0
  39 #endif
  40
  41 #define str(arg) #arg
  42 #define to_str(arg) str(arg)
  43
  44 #define streq(s1, s2) (strcmp (s1, s2) == 0)
  45
  46 #if DEBUG
  47 # define xmalloc(size)        malloc_wrap_debug(size,        __FILE__, __LINE__)
  48 # define xcalloc(nmemb, size) calloc_wrap_debug(nmemb, size, __FILE__, __LINE__)
  49 # define xrealloc(ptr, size)  realloc_wrap_debug(ptr, size,  __FILE__, __LINE__)
  50 #else
  51 # define xmalloc(size)        malloc_wrap(size)
  52 # define xcalloc(nmemb, size) calloc_wrap(nmemb, size)
  53 # define xrealloc(ptr, size)  realloc_wrap(ptr, size)
  54 #endif
  55
  56 #define free_null(ptr) free_wrap((void **)&ptr)
  57 #define xstrdup(str)   strdup_wrap(str)
  58
  59 #if BUF_SIZE <= 0
  60 # undef BUF_SIZE
  61 #endif
  62 #ifndef BUF_SIZE
  63 # define BUF_SIZE 4096
  64 #endif
  65
  66 #define LF 0x01
  67 #define CR 0x02
  68
  69 #define SKIP_LINE_ENDINGS(flags) (((flags) & CR) && ((flags) & LF) ? 2 : 1)
  70
  71 #define STACK_VAR(ptr) do {                                   \
  72     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  73 } while (false)
  74
  75 #define RELEASE_VAR(ptr) do {                             \
  76     release_var (vars_list, stacked_vars, (void **)&ptr); \
  77 } while (false)
  78
  79 #define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                               \
  80     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
  81     exit (2);                                                                               \
  82 } while (false)
  83 #define MEM_ALLOC_FAIL() do {                                          \
  84     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  85     exit (2);                                                          \
  86 } while (false)
  87
  88 #define ABORT_TRACE()                                                              \
  89     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
  90     abort ();                                                                      \
  91
  92 #define CHECK_COLORS_RANDOM(color1, color2)        \
  93      streq (color_names[color1]->name, "random")   \
  94  && (streq (color_names[color2]->name, "none")     \
  95   || streq (color_names[color2]->name, "default")) \
  96
  97 #define COLOR_SEP_CHAR '/'
  98
  99 #define VERSION "0.52"
 100
 101 typedef enum { false, true } bool;
 102
 103 struct color_name {
 104     char *name;
 105     char *orig;
 106 };
 107
 108 static struct color_name *color_names[3] = { NULL, NULL, NULL };
 109
 110 struct color {
 111     const char *name;
 112     const char *code;
 113 };
 114
 115 static const struct color fg_colors[] = {
 116     { "none",     NULL },
 117     { "black",   "30m" },
 118     { "red",     "31m" },
 119     { "green",   "32m" },
 120     { "yellow",  "33m" },
 121     { "blue",    "34m" },
 122     { "magenta", "35m" },
 123     { "cyan",    "36m" },
 124     { "white",   "37m" },
 125     { "default", "39m" },
 126 };
 127 static const struct color bg_colors[] = {
 128     { "none",     NULL },
 129     { "black",   "40m" },
 130     { "red",     "41m" },
 131     { "green",   "42m" },
 132     { "yellow",  "43m" },
 133     { "blue",    "44m" },
 134     { "magenta", "45m" },
 135     { "cyan",    "46m" },
 136     { "white",   "47m" },
 137     { "default", "49m" },
 138 };
 139
 140 enum fmts {
 141     FMT_GENERIC,
 142     FMT_COLOR,
 143     FMT_RANDOM,
 144     FMT_ERROR,
 145     FMT_FILE
 146 };
 147 static const char *formats[] = {
 148     "%s",                    /* generic */
 149     "%s color '%s' %s",      /* color   */
 150     "%s color '%s' %s '%s'", /* random  */
 151     "less than %u bytes %s", /* error   */
 152     "%s: %s",                /* file    */
 153 };
 154
 155 enum { FOREGROUND, BACKGROUND };
 156
 157 static const struct {
 158     struct color const *entries;
 159     unsigned int count;
 160     const char *desc;
 161 } tables[] = {
 162     { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
 163     { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
 164 };
 165
 166 static FILE *stream = NULL;
 167
 168 static unsigned int stacked_vars = 0;
 169 static void **vars_list = NULL;
 170
 171 static bool clean = false;
 172 static bool clean_all = false;
 173
 174 static char *exclude = NULL;
 175
 176 static const char *program_name;
 177
 178 static void print_help (void);
 179 static void print_version (void);
 180 static void cleanup (void);
 181 static void free_color_names (struct color_name **);
 182 static void process_args (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
 183 static void process_file_arg (const char *, const char **, FILE **);
 184 static void read_print_stream (bool, const struct color **, const char *, FILE *);
 185 static void find_color_entries (struct color_name **, const struct color **);
 186 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 187 static void print_line (bool, const struct color **, const char * const, unsigned int);
 188 static void print_clean (const char *);
 189 static void print_free_offsets (const char *, char ***, unsigned int);
 190 static void *malloc_wrap (size_t);
 191 static void *calloc_wrap (size_t, size_t);
 192 static void *realloc_wrap (void *, size_t);
 193 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 194 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 195 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 196 static void free_wrap (void **);
 197 static char *strdup_wrap (const char *);
 198 static char *str_concat (const char *, const char *);
 199 static bool has_color_name (const char *, const char *);
 200 static void vfprintf_diag (const char *, ...);
 201 static void vfprintf_fail (const char *, ...);
 202 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 203 static void release_var (void **, unsigned int, void **);
 204
 205 #define SET_OPT_TYPE(type) \
 206     opt_type = type;       \
 207     opt = 0;               \
 208     goto PARSE_OPT;        \
 209
 210 extern char *optarg;
 211 extern int optind;
 212
 213 int
 214 main (int argc, char **argv)
 215 {
 216     unsigned int arg_cnt = 0;
 217
 218     enum {
 219         OPT_CLEAN = 1,
 220         OPT_CLEAN_ALL,
 221         OPT_EXCLUDE_RANDOM,
 222         OPT_HELP,
 223         OPT_VERSION
 224     };
 225
 226     int opt, opt_type = 0;
 227     struct option long_opts[] = {
 228         { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 229         { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
 230         { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 231         { "help",           no_argument,       &opt_type, OPT_HELP           },
 232         { "version",        no_argument,       &opt_type, OPT_VERSION        },
 233         {  NULL,            0,                 NULL,      0                  },
 234     };
 235
 236     bool bold = false;
 237
 238     const struct color *colors[2] = {
 239         NULL, /* foreground */
 240         NULL, /* background */
 241     };
 242
 243     const char *file = NULL;
 244
 245     program_name = argv[0];
 246     atexit (cleanup);
 247
 248     setvbuf (stdout, NULL, _IOLBF, 0);
 249
 250     while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
 251       {
 252         PARSE_OPT:
 253         switch (opt)
 254           {
 255             case 0: /* long opts */
 256               switch (opt_type)
 257                 {
 258                   case OPT_CLEAN:
 259                     clean = true;
 260                     break;
 261                   case OPT_CLEAN_ALL:
 262                     clean_all = true;
 263                     break;
 264                   case OPT_EXCLUDE_RANDOM: {
 265                     bool valid = false;
 266                     unsigned int i;
 267                     exclude = xstrdup (optarg);
 268                     STACK_VAR (exclude);
 269                     for (i = 1; i < tables[FOREGROUND].count - 1; i++) /* skip color none and default */
 270                       {
 271                         const struct color *entry = &tables[FOREGROUND].entries[i];
 272                         if (streq (exclude, entry->name))
 273                           {
 274                             valid = true;
 275                             break;
 276                           }
 277                       }
 278                     if (!valid)
 279                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain color");
 280                     break;
 281                   }
 282                   case OPT_HELP:
 283                     print_help ();
 284                     exit (EXIT_SUCCESS);
 285                   case OPT_VERSION:
 286                     print_version ();
 287                     exit (EXIT_SUCCESS);
 288                   default: /* never reached */
 289                     ABORT_TRACE ();
 290                 }
 291               break;
 292             case 'h':
 293               SET_OPT_TYPE (OPT_HELP);
 294             case 'v':
 295               SET_OPT_TYPE (OPT_VERSION);
 296             case '?':
 297               print_help ();
 298               exit (EXIT_FAILURE);
 299             default: /* never reached */
 300               ABORT_TRACE ();
 301           }
 302       }
 303
 304     arg_cnt = argc - optind;
 305
 306     if (clean || clean_all)
 307       {
 308         if (clean && clean_all)
 309           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 310         if (arg_cnt > 1)
 311           {
 312             const char *format = "%s %s";
 313             const char *message = "switch cannot be used with more than one file";
 314             if (clean)
 315               vfprintf_fail (format, "--clean", message);
 316             else if (clean_all)
 317               vfprintf_fail (format, "--clean-all", message);
 318           }
 319       }
 320     else
 321       {
 322         if (arg_cnt == 0 || arg_cnt > 2)
 323           {
 324             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or option", arg_cnt);
 325             print_help ();
 326             exit (EXIT_FAILURE);
 327           }
 328       }
 329
 330     if (clean || clean_all)
 331       process_file_arg (argv[optind], &file, &stream);
 332     else
 333       process_args (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 334     read_print_stream (bold, colors, file, stream);
 335
 336     RELEASE_VAR (exclude);
 337
 338     exit (EXIT_SUCCESS);
 339 }
 340
 341 static void
 342 print_help (void)
 343 {
 344     unsigned int i;
 345
 346     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 347     printf ("\tColors (foreground) (background)\n");
 348     for (i = 0; i < tables[FOREGROUND].count; i++)
 349       {
 350         const struct color *entry = &tables[FOREGROUND].entries[i];
 351         const char *name = entry->name;
 352         const char *code = entry->code;
 353         if (code)
 354           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 355                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 356         else
 357           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 358       }
 359     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 360
 361     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 362     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 363
 364     printf ("\n\tOptions\n");
 365     printf ("\t\t    --clean\n");
 366     printf ("\t\t    --clean-all\n");
 367     printf ("\t\t    --exclude-random\n");
 368     printf ("\t\t-h, --help\n");
 369     printf ("\t\t-v, --version\n\n");
 370 }
 371
 372 static void
 373 print_version (void)
 374 {
 375     const char *c_flags;
 376     bool debug;
 377 #ifdef CFLAGS
 378     c_flags = to_str (CFLAGS);
 379 #else
 380     c_flags = "unknown";
 381 #endif
 382 #if DEBUG
 383     debug = true;
 384 #else
 385     debug = false;
 386 #endif
 387     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 388     printf ("Compiler flags: %s\n", c_flags);
 389     printf ("Buffer size: %u bytes\n", BUF_SIZE);
 390     printf ("Debugging: %s\n", debug ? "yes" : "no");
 391 }
 392
 393 static void
 394 cleanup (void)
 395 {
 396     free_color_names (color_names);
 397
 398     if (stream && fileno (stream) != STDIN_FILENO)
 399       fclose (stream);
 400
 401     if (vars_list)
 402       {
 403         unsigned int i;
 404         for (i = 0; i < stacked_vars; i++)
 405           if (vars_list[i])
 406             free_null (vars_list[i]);
 407
 408         free_null (vars_list);
 409       }
 410 }
 411
 412 static void
 413 free_color_names (struct color_name **color_names)
 414 {
 415     unsigned int i;
 416     for (i = 0; color_names[i]; i++)
 417       {
 418         free_null (color_names[i]->name);
 419         free_null (color_names[i]->orig);
 420         free_null (color_names[i]);
 421       }
 422 }
 423
 424 static void
 425 process_args (unsigned int arg_cnt, char **arg_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 426 {
 427     int ret;
 428     unsigned int index;
 429     char *color, *p, *str;
 430     struct stat sb;
 431
 432     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 433     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 434
 435     assert (color_string);
 436
 437     if (streq (color_string, "-"))
 438       {
 439         if (file_string)
 440           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 441         else
 442           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 443       }
 444
 445     ret = stat (color_string, &sb);
 446
 447     /* Ensure that we don't fail if there's a file with one or more
 448        color names in its path.  */
 449     if (ret != -1)
 450       {
 451         bool have_file;
 452         unsigned int c;
 453         const char *color = color_string;
 454
 455         for (c = 1; c <= 2 && *color; c++)
 456           {
 457             bool matched = false;
 458             unsigned int i;
 459             for (i = 0; i < tables[FOREGROUND].count; i++)
 460               {
 461                 const struct color *entry = &tables[FOREGROUND].entries[i];
 462                 if (has_color_name (color, entry->name))
 463                   {
 464                     color += strlen (entry->name);
 465                     matched = true;
 466                     break;
 467                   }
 468               }
 469             if (!matched && has_color_name (color, "random"))
 470               {
 471                 color += strlen ("random");
 472                 matched = true;
 473               }
 474             if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 475               color++;
 476             else
 477               break;
 478           }
 479
 480         have_file = (*color != '\0');
 481
 482         if (have_file)
 483           {
 484             if (file_string)
 485               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 486             else
 487               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 488           }
 489       }
 490
 491     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 492       {
 493         if (p == color_string)
 494           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 495         else if (p == color_string + strlen (color_string) - 1)
 496           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 497         else if (strchr (++p, COLOR_SEP_CHAR))
 498           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 499       }
 500
 501     str = xstrdup (color_string);
 502     STACK_VAR (str);
 503
 504     for (index = 0, color = str; *color; index++, color = p)
 505       {
 506         char *ch, *sep;
 507
 508         p = NULL;
 509         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 510           {
 511             *sep = '\0';
 512             p = sep + 1;
 513           }
 514         else
 515           p = color + strlen (color);
 516         assert (p);
 517
 518         for (ch = color; *ch; ch++)
 519           if (!isalpha (*ch))
 520             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 521
 522         for (ch = color + 1; *ch; ch++)
 523           if (!islower (*ch))
 524             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 525
 526         if (streq (color, "None"))
 527           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 528
 529         if (isupper (*color))
 530           {
 531             switch (index)
 532               {
 533                 case FOREGROUND:
 534                   *bold = true;
 535                   break;
 536                 case BACKGROUND:
 537                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 538                   break;
 539                 default: /* never reached */
 540                   ABORT_TRACE ();
 541               }
 542           }
 543
 544         color_names[index] = xcalloc (1, sizeof (struct color_name));
 545
 546         color_names[index]->orig = xstrdup (color);
 547
 548         for (ch = color; *ch; ch++)
 549           *ch = tolower (*ch);
 550
 551         color_names[index]->name = xstrdup (color);
 552       }
 553
 554     RELEASE_VAR (str);
 555
 556     assert (color_names[FOREGROUND]);
 557
 558     if (color_names[BACKGROUND])
 559       {
 560         unsigned int i;
 561         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 562         for (i = 0; i < 2; i++)
 563           {
 564             unsigned int color1 = color_sets[i][0];
 565             unsigned int color2 = color_sets[i][1];
 566             if (CHECK_COLORS_RANDOM (color1, color2))
 567               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 568           }
 569       }
 570
 571     find_color_entries (color_names, colors);
 572     free_color_names (color_names);
 573
 574     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 575       {
 576         struct color_name color_name;
 577         color_name.name = color_name.orig = "default";
 578
 579         find_color_entry (&color_name, FOREGROUND, colors);
 580       }
 581
 582     process_file_arg (file_string, file, stream);
 583 }
 584
 585 static void
 586 process_file_arg (const char *file_string, const char **file, FILE **stream)
 587 {
 588     if (file_string)
 589       {
 590         if (streq (file_string, "-"))
 591           *stream = stdin;
 592         else
 593           {
 594             FILE *s;
 595             const char *file = file_string;
 596             struct stat sb;
 597             int errno, ret;
 598
 599             errno = 0;
 600             ret = stat (file, &sb);
 601
 602             if (ret == -1)
 603               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 604
 605             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 606               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 607
 608             errno = 0;
 609
 610             s = fopen (file, "r");
 611             if (!s)
 612               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 613             *stream = s;
 614           }
 615         *file = file_string;
 616       }
 617     else
 618       {
 619         *stream = stdin;
 620         *file = "stdin";
 621       }
 622
 623     assert (*stream);
 624     assert (*file);
 625 }
 626
 627 #define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
 628     char *current_line, *merged_line = NULL;                     \
 629     if (part_line)                                               \
 630       {                                                          \
 631         merged_line = str_concat (part_line, line);              \
 632         free_null (part_line);                                   \
 633       }                                                          \
 634     current_line = merged_line ? merged_line : (char *)line;     \
 635     if (!check_eof || *current_line != '\0')                     \
 636       print_line (bold, colors, current_line, flags);            \
 637     free (merged_line);                                          \
 638 } while (false)
 639
 640 static void
 641 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream)
 642 {
 643     char buf[BUF_SIZE + 1], *part_line = NULL;
 644     unsigned int flags = 0;
 645
 646     while (!feof (stream))
 647       {
 648         size_t bytes_read;
 649         char *eol;
 650         const char *line;
 651         memset (buf, '\0', BUF_SIZE + 1);
 652         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 653         if (bytes_read != BUF_SIZE && ferror (stream))
 654           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 655         line = buf;
 656         while ((eol = strpbrk (line, "\n\r")))
 657           {
 658             char *p;
 659             flags &= ~(CR|LF);
 660             if (*eol == '\r')
 661               {
 662                 flags |= CR;
 663                 if (*(eol + 1) == '\n')
 664                   flags |= LF;
 665               }
 666             else if (*eol == '\n')
 667               flags |= LF;
 668             else
 669               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 670             p = eol + SKIP_LINE_ENDINGS (flags);
 671             *eol = '\0';
 672             MERGE_PRINT_LINE (part_line, line, flags, false);
 673             line = p;
 674           }
 675         if (feof (stream)) {
 676           MERGE_PRINT_LINE (part_line, line, 0, true);
 677         }
 678         else if (*line != '\0')
 679           {
 680             if (!clean && !clean_all) /* efficiency */
 681               print_line (bold, colors, line, 0);
 682             else if (!part_line)
 683               part_line = xstrdup (line);
 684             else
 685               {
 686                 char *merged_line = str_concat (part_line, line);
 687                 free (part_line);
 688                 part_line = merged_line;
 689               }
 690           }
 691       }
 692 }
 693
 694 static void
 695 find_color_entries (struct color_name **color_names, const struct color **colors)
 696 {
 697     struct timeval tv;
 698     unsigned int index;
 699
 700     /* randomness */
 701     gettimeofday (&tv, NULL);
 702     srand (tv.tv_usec * tv.tv_sec);
 703
 704     for (index = 0; color_names[index]; index++)
 705       {
 706         const char *color_name = color_names[index]->name;
 707
 708         const unsigned int count                = tables[index].count;
 709         const struct color *const color_entries = tables[index].entries;
 710
 711         if (streq (color_name, "random"))
 712           {
 713             bool excludable;
 714             unsigned int i;
 715             do {
 716               excludable = false;
 717               i = rand() % (count - 2) + 1; /* omit color none and default */
 718               switch (index)
 719                 {
 720                   case FOREGROUND:
 721                     /* --exclude-random */
 722                     if (exclude && streq (exclude, color_entries[i].name))
 723                       excludable = true;
 724                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 725                       excludable = true;
 726                     break;
 727                   case BACKGROUND:
 728                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 729                       excludable = true;
 730                     break;
 731                   default: /* never reached */
 732                     ABORT_TRACE ();
 733                  }
 734             } while (excludable);
 735             colors[index] = (struct color *)&color_entries[i];
 736           }
 737         else
 738           find_color_entry (color_names[index], index, colors);
 739       }
 740 }
 741
 742 static void
 743 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
 744 {
 745     bool found = false;
 746     unsigned int i;
 747
 748     const unsigned int count                = tables[index].count;
 749     const struct color *const color_entries = tables[index].entries;
 750
 751     for (i = 0; i < count; i++)
 752       if (streq (color_name->name, color_entries[i].name))
 753         {
 754           colors[index] = (struct color *)&color_entries[i];
 755           found = true;
 756           break;
 757         }
 758     if (!found)
 759       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
 760 }
 761
 762 static void
 763 print_line (bool bold, const struct color **colors, const char *const line, unsigned int flags)
 764 {
 765     /* --clean[-all] */
 766     if (clean || clean_all)
 767       print_clean (line);
 768     else
 769       {
 770         /* Foreground color code is guaranteed to be set when background color code is present.  */
 771         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 772           printf ("\033[%s", colors[BACKGROUND]->code);
 773         if (colors[FOREGROUND]->code)
 774           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 775         else
 776           printf (formats[FMT_GENERIC], line);
 777       }
 778     if (flags & CR)
 779       putchar ('\r');
 780     if (flags & LF)
 781       putchar ('\n');
 782 }
 783
 784 static void
 785 print_clean (const char *line)
 786 {
 787     const char *p;
 788     char ***offsets = NULL;
 789     unsigned int count = 0, i = 0;
 790
 791     for (p = line; *p;)
 792       {
 793         /* ESC[ */
 794         if (*p == 27 && *(p + 1) == '[')
 795           {
 796             const char *begin = p;
 797             p += 2;
 798             if (clean_all)
 799               {
 800                 while (isdigit (*p) || *p == ';')
 801                   p++;
 802               }
 803             else if (clean)
 804               {
 805                 bool check_values;
 806                 unsigned int iter = 0;
 807                 const char *digit;
 808                 do {
 809                   check_values = false;
 810                   iter++;
 811                   if (!isdigit (*p))
 812                     goto DISCARD;
 813                   digit = p;
 814                   while (isdigit (*p))
 815                     p++;
 816                   if (p - digit > 2)
 817                     goto DISCARD;
 818                   else /* check range */
 819                     {
 820                       char val[3];
 821                       int value;
 822                       unsigned int i;
 823                       const unsigned int digits = p - digit;
 824                       for (i = 0; i < digits; i++)
 825                         val[i] = *digit++;
 826                       val[i] = '\0';
 827                       value = atoi (val);
 828                       if (value == 0) /* reset */
 829                         {
 830                           if (iter > 1)
 831                             goto DISCARD;
 832                           goto END;
 833                         }
 834                       else if (value == 1) /* bold */
 835                         {
 836                           bool discard = false;
 837                           if (iter > 1)
 838                             discard = true;
 839                           else if (*p != ';')
 840                             discard = true;
 841                           if (discard)
 842                             goto DISCARD;
 843                           p++;
 844                           check_values = true;
 845                         }
 846                       else if ((value >= 30 && value <= 37) || value == 39) /* foreground colors */
 847                         goto END;
 848                       else if ((value >= 40 && value <= 47) || value == 49) /* background colors */
 849                         {
 850                           if (iter > 1)
 851                             goto DISCARD;
 852                           goto END;
 853                         }
 854                       else
 855                         goto DISCARD;
 856                     }
 857                 } while (iter == 1 && check_values);
 858               }
 859             END: if (*p == 'm')
 860               {
 861                 const char *end = p++;
 862                 if (!offsets)
 863                   offsets = xmalloc (++count * sizeof (char **));
 864                 else
 865                   offsets = xrealloc (offsets, ++count * sizeof (char **));
 866                 offsets[i] = xmalloc (2 * sizeof (char *));
 867                 offsets[i][0] = (char *)begin; /* ESC */
 868                 offsets[i][1] = (char *)end;   /* m */
 869                 i++;
 870                 continue;
 871               }
 872             DISCARD:
 873               continue;
 874           }
 875         p++;
 876       }
 877
 878     if (offsets)
 879       print_free_offsets (line, offsets, count);
 880     else
 881       printf (formats[FMT_GENERIC], line);
 882 }
 883
 884 #define SET_CHAR(offset, new, old) \
 885     *old = *offset;                \
 886     *offset = new;                 \
 887
 888 #define RESTORE_CHAR(offset, old)  \
 889     *offset = old;                 \
 890
 891 static void
 892 print_free_offsets (const char *line, char ***offsets, unsigned int count)
 893 {
 894     char ch;
 895     unsigned int i;
 896
 897     SET_CHAR (offsets[0][0], '\0', &ch);
 898     printf (formats[FMT_GENERIC], line);
 899     RESTORE_CHAR (offsets[0][0], ch);
 900
 901     for (i = 0; i < count; i++)
 902       {
 903         char ch;
 904         bool next_offset = false;
 905         if (i + 1 < count)
 906           {
 907             SET_CHAR (offsets[i + 1][0], '\0', &ch);
 908             next_offset = true;
 909           }
 910         printf (formats[FMT_GENERIC], offsets[i][1] + 1);
 911         if (next_offset)
 912           RESTORE_CHAR (offsets[i + 1][0], ch);
 913       }
 914     for (i = 0; i < count; i++)
 915       free_null (offsets[i]);
 916     free_null (offsets);
 917 }
 918
 919 static void *
 920 malloc_wrap (size_t size)
 921 {
 922     void *p = malloc (size);
 923     if (!p)
 924       MEM_ALLOC_FAIL ();
 925     return p;
 926 }
 927
 928 static void *
 929 calloc_wrap (size_t nmemb, size_t size)
 930 {
 931     void *p = calloc (nmemb, size);
 932     if (!p)
 933       MEM_ALLOC_FAIL ();
 934     return p;
 935 }
 936
 937 static void *
 938 realloc_wrap (void *ptr, size_t size)
 939 {
 940     void *p = realloc (ptr, size);
 941     if (!p)
 942       MEM_ALLOC_FAIL ();
 943     return p;
 944 }
 945
 946 static void *
 947 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
 948 {
 949     void *p = malloc (size);
 950     if (!p)
 951       MEM_ALLOC_FAIL_DEBUG (file, line);
 952     return p;
 953 }
 954
 955 static void *
 956 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
 957 {
 958     void *p = calloc (nmemb, size);
 959     if (!p)
 960       MEM_ALLOC_FAIL_DEBUG (file, line);
 961     return p;
 962 }
 963
 964 static void *
 965 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
 966 {
 967     void *p = realloc (ptr, size);
 968     if (!p)
 969       MEM_ALLOC_FAIL_DEBUG (file, line);
 970     return p;
 971 }
 972
 973 static void
 974 free_wrap (void **ptr)
 975 {
 976     free (*ptr);
 977     *ptr = NULL;
 978 }
 979
 980 static char *
 981 strdup_wrap (const char *str)
 982 {
 983     const size_t len = strlen (str) + 1;
 984     char *p = xmalloc (len);
 985     strncpy (p, str, len);
 986     return p;
 987 }
 988
 989 static char *
 990 str_concat (const char *str1, const char *str2)
 991 {
 992     const size_t len = strlen (str1) + strlen (str2) + 1;
 993     char *p, *str;
 994
 995     p = str = xmalloc (len);
 996     strncpy (p, str1, strlen (str1));
 997     p += strlen (str1);
 998     strncpy (p, str2, strlen (str2));
 999     p += strlen (str2);
1000     *p = '\0';
1001
1002     return str;
1003 }
1004
1005 static bool
1006 has_color_name (const char *str, const char *name)
1007 {
1008     char *p;
1009
1010     assert (strlen (str));
1011     assert (strlen (name));
1012
1013     if (!(*str == *name || *str == toupper (*name)))
1014       return false;
1015     else if (*(name + 1) != '\0'
1016      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1017       return false;
1018
1019     return true;
1020 }
1021
1022 #define DO_VFPRINTF(fmt)                    \
1023     va_list ap;                             \
1024     fprintf (stderr, "%s: ", program_name); \
1025     va_start (ap, fmt);                     \
1026     vfprintf (stderr, fmt, ap);             \
1027     va_end (ap);                            \
1028     fprintf (stderr, "\n");                 \
1029
1030 static void
1031 vfprintf_diag (const char *fmt, ...)
1032 {
1033     DO_VFPRINTF (fmt);
1034 }
1035
1036 static void
1037 vfprintf_fail (const char *fmt, ...)
1038 {
1039     DO_VFPRINTF (fmt);
1040     exit (EXIT_FAILURE);
1041 }
1042
1043 static void
1044 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1045 {
1046     /* nothing to stack */
1047     if (ptr == NULL)
1048       return;
1049     if (!*list)
1050       *list = xmalloc (sizeof (void *));
1051     else
1052       {
1053         unsigned int i;
1054         for (i = 0; i < *stacked; i++)
1055           if (!(*list)[i])
1056             {
1057               (*list)[i] = ptr;
1058               return; /* reused */
1059             }
1060         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1061       }
1062     (*list)[index] = ptr;
1063     (*stacked)++;
1064 }
1065
1066 static void
1067 release_var (void **list, unsigned int stacked, void **ptr)
1068 {
1069     unsigned int i;
1070     /* nothing to release */
1071     if (*ptr == NULL)
1072       return;
1073     for (i = 0; i < stacked; i++)
1074       if (list[i] == *ptr)
1075         {
1076           free (*ptr);
1077           *ptr = NULL;
1078           list[i] = NULL;
1079           return;
1080         }
1081 }