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 #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 !defined BUF_SIZE || BUF_SIZE <= 0
  60 # undef BUF_SIZE
  61 # define BUF_SIZE 4096 + 1
  62 #endif
  63
  64 #define LF 0x01
  65 #define CR 0x02
  66
  67 #define SKIP_LINE_ENDINGS(flags) (((flags) & CR) && ((flags) & LF) ? 2 : 1)
  68
  69 #define STACK_VAR(ptr) do {                                   \
  70     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  71 } while (false);
  72
  73 #define RELEASE_VAR(ptr) do {                             \
  74     release_var (vars_list, stacked_vars, (void **)&ptr); \
  75 } while (false);
  76
  77 #define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                               \
  78     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
  79     exit (2);                                                                               \
  80 } while (false);
  81 #define MEM_ALLOC_FAIL() do {                                          \
  82     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  83     exit (2);                                                          \
  84 } while (false);
  85
  86 #define ABORT_TRACE()                                                              \
  87     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
  88     abort ();                                                                      \
  89
  90 #define CHECK_COLORS_RANDOM(color1, color2)        \
  91      streq (color_names[color1]->name, "random")   \
  92  && (streq (color_names[color2]->name, "none")     \
  93   || streq (color_names[color2]->name, "default")) \
  94
  95 #define COLOR_SEP_CHAR '/'
  96
  97 #define VERSION "0.50"
  98
  99 typedef unsigned short bool;
 100
 101 enum { false, true };
 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     { "cyan",    "35m" },
 123     { "magenta", "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     { "cyan",    "45m" },
 135     { "magenta", "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 enum stream_mode { SCAN_FIRST = 1, SCAN_ALWAYS };
 167
 168 struct ending {
 169     unsigned int flags;
 170     const char newline[3];
 171 };
 172
 173 static const struct ending endings[] = {
 174     { CR & LF, "\r\n" },
 175     { CR,      "\r"   },
 176     { LF,      "\n"   },
 177 };
 178
 179 static FILE *stream = NULL;
 180
 181 static unsigned int stacked_vars = 0;
 182 static void **vars_list = NULL;
 183
 184 static bool clean = false;
 185 static bool clean_all = false;
 186
 187 static char *exclude = NULL;
 188
 189 static const char *program_name;
 190
 191 static void print_help (void);
 192 static void print_version (void);
 193 static void cleanup (void);
 194 static void free_color_names (struct color_name **);
 195 static void process_options (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
 196 static void process_file_option (const char *, const char **, FILE **);
 197 static void read_print_stream (bool, const struct color **, const char *, FILE *, enum stream_mode);
 198 static void find_color_entries (struct color_name **, const struct color **);
 199 static void find_color_entry (const char *const, unsigned int, const struct color **);
 200 static void print_line (const struct color **, bool, const char * const, unsigned int);
 201 static void print_clean (const char *);
 202 static void print_free_offsets (const char *, char ***, unsigned int);
 203 static void *malloc_wrap (size_t);
 204 static void *calloc_wrap (size_t, size_t);
 205 static void *realloc_wrap (void *, size_t);
 206 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 207 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 208 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 209 static void free_wrap (void **);
 210 static char *strdup_wrap (const char *);
 211 static char *str_concat (const char *, const char *);
 212 static void vfprintf_fail (const char *, ...);
 213 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 214 static void release_var (void **, unsigned int, void **);
 215
 216 #define SET_OPT_TYPE(type) \
 217     opt_type = type;       \
 218     opt = 0;               \
 219     goto PARSE_OPT;        \
 220
 221 extern char *optarg;
 222 extern int optind;
 223
 224 int
 225 main (int argc, char **argv)
 226 {
 227     unsigned int arg_cnt = 0;
 228
 229     enum {
 230         OPT_CLEAN = 1,
 231         OPT_CLEAN_ALL,
 232         OPT_EXCLUDE_RANDOM,
 233         OPT_HELP,
 234         OPT_VERSION
 235     };
 236
 237     int opt, opt_type = 0;
 238     struct option long_opts[] = {
 239         { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 240         { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
 241         { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 242         { "help",           no_argument,       &opt_type, OPT_HELP           },
 243         { "version",        no_argument,       &opt_type, OPT_VERSION        },
 244         {  0,               0,                 0,         0                  },
 245     };
 246
 247     bool bold = false;
 248
 249     const struct color *colors[2] = {
 250         NULL, /* foreground */
 251         NULL, /* background */
 252     };
 253
 254     const char *file;
 255
 256     enum stream_mode mode = SCAN_FIRST;
 257
 258     program_name = argv[0];
 259     atexit (cleanup);
 260
 261     setvbuf (stdout, NULL, _IOLBF, 0);
 262
 263     while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
 264       {
 265         PARSE_OPT:
 266         switch (opt)
 267           {
 268             case 0: /* long opts */
 269               switch (opt_type)
 270                 {
 271                   case OPT_CLEAN:
 272                     clean = true;
 273                     break;
 274                   case OPT_CLEAN_ALL:
 275                     clean_all = true;
 276                     break;
 277                   case OPT_EXCLUDE_RANDOM: {
 278                     char *p;
 279                     exclude = xstrdup (optarg);
 280                     STACK_VAR (exclude);
 281                     for (p = exclude; *p; p++)
 282                       *p = tolower (*p);
 283                     if (streq (exclude, "random"))
 284                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a color");
 285                     break;
 286                   }
 287                   case OPT_HELP:
 288                     print_help ();
 289                     exit (EXIT_SUCCESS);
 290                   case OPT_VERSION:
 291                     print_version ();
 292                     exit (EXIT_SUCCESS);
 293                   default: /* never reached */
 294                     ABORT_TRACE ();
 295                 }
 296               break;
 297             case 'h':
 298               SET_OPT_TYPE (OPT_HELP);
 299             case 'v':
 300               SET_OPT_TYPE (OPT_VERSION);
 301             case '?':
 302               print_help ();
 303               exit (EXIT_FAILURE);
 304             default: /* never reached */
 305               ABORT_TRACE ();
 306           }
 307       }
 308
 309     arg_cnt = argc - optind;
 310
 311     if (clean || clean_all)
 312       {
 313         if (arg_cnt > 1)
 314           {
 315             const char *format = "%s %s";
 316             const char *message = "switch cannot be used with more than one file";
 317             if (clean)
 318               vfprintf_fail (format, "--clean", message);
 319             else if (clean_all)
 320               vfprintf_fail (format, "--clean-all", message);
 321           }
 322       }
 323     else
 324       {
 325         if (arg_cnt == 0 || arg_cnt > 2)
 326           {
 327             print_help ();
 328             exit (EXIT_FAILURE);
 329           }
 330       }
 331
 332     if (clean || clean_all)
 333       process_file_option (argv[optind], &file, &stream);
 334     else
 335       process_options (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 336     read_print_stream (bold, colors, file, stream, mode);
 337
 338     RELEASE_VAR (exclude);
 339
 340     exit (EXIT_SUCCESS);
 341 }
 342
 343 static void
 344 print_help (void)
 345 {
 346     unsigned int i;
 347
 348     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 349     printf ("\tColors (foreground) (background)\n");
 350     for (i = 0; i < tables[FOREGROUND].count; i++)
 351       {
 352         const struct color *entry = &tables[FOREGROUND].entries[i];
 353         const char *name = entry->name;
 354         const char *code = entry->code;
 355         if (code)
 356           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 357                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 358         else
 359           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 360       }
 361     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 362
 363     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 364     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 365
 366     printf ("\n\tOptions\n");
 367     printf ("\t\t    --clean\n");
 368     printf ("\t\t    --clean-all\n");
 369     printf ("\t\t    --exclude-random\n");
 370     printf ("\t\t-h, --help\n");
 371     printf ("\t\t-v, --version\n\n");
 372 }
 373
 374 static void
 375 print_version (void)
 376 {
 377     const char *c_flags;
 378     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 379 #ifdef CFLAGS
 380     c_flags = to_str (CFLAGS);
 381 #else
 382     c_flags = "unknown";
 383 #endif
 384     printf ("Compiler flags: %s\n", c_flags);
 385     printf ("Buffer size: %u bytes\n", BUF_SIZE - 1);
 386 }
 387
 388 static void
 389 cleanup (void)
 390 {
 391     free_color_names (color_names);
 392
 393     if (stream && fileno (stream) != STDIN_FILENO)
 394       fclose (stream);
 395
 396     if (vars_list)
 397       {
 398         unsigned int i;
 399         for (i = 0; i < stacked_vars; i++)
 400           if (vars_list[i])
 401             free_null (vars_list[i]);
 402
 403         free_null (vars_list);
 404       }
 405 }
 406
 407 static void
 408 free_color_names (struct color_name **color_names)
 409 {
 410     unsigned int i;
 411     for (i = 0; color_names[i]; i++)
 412       {
 413         free_null (color_names[i]->name);
 414         free_null (color_names[i]->orig);
 415         free_null (color_names[i]);
 416       }
 417 }
 418
 419 static void
 420 process_options (unsigned int arg_cnt, char **option_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 421 {
 422     int ret;
 423     unsigned int index;
 424     char *color, *p, *str;
 425     struct stat sb;
 426
 427     const char *color_string = arg_cnt >= 1 ? option_strings[0] : NULL;
 428     const char *file_string  = arg_cnt == 2 ? option_strings[1] : NULL;
 429
 430     assert (color_string);
 431
 432     if (streq (color_string, "-"))
 433       {
 434         if (file_string)
 435           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 436         else
 437           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 438       }
 439
 440     ret = stat (color_string, &sb);
 441
 442     /* Ensure that we don't fail if there's a file with one or more
 443        color names in its path.  */
 444     if (ret != -1)
 445       {
 446         bool have_file;
 447         unsigned int c;
 448         const char *color = color_string;
 449
 450         for (c = 1; c <= 2 && *color; c++)
 451           {
 452             bool matched = false;
 453             unsigned int i;
 454             for (i = 0; i < tables[FOREGROUND].count; i++)
 455               {
 456                 const struct color *entry = &tables[FOREGROUND].entries[i];
 457                 char *p;
 458                 if ((p = strstr (color, entry->name)) && p == color)
 459                   {
 460                     color = p + strlen (entry->name);
 461                     matched = true;
 462                     break;
 463                   }
 464               }
 465             if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 466               color++;
 467             else
 468               break;
 469           }
 470
 471         have_file = (*color != '\0');
 472
 473         if (have_file)
 474           {
 475             if (file_string)
 476               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 477             else
 478               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 479           }
 480       }
 481
 482     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 483       {
 484         if (p == color_string)
 485           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 486         else if (p == color_string + strlen (color_string) - 1)
 487           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 488         else if (strchr (++p, COLOR_SEP_CHAR))
 489           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 490       }
 491
 492     str = xstrdup (color_string);
 493     STACK_VAR (str);
 494
 495     for (index = 0, color = str; *color; index++, color = p)
 496       {
 497         char *ch, *sep;
 498         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 499           {
 500             *sep = '\0';
 501             p = sep + 1;
 502           }
 503         else
 504           p = color + strlen (color);
 505
 506         for (ch = color; *ch; ch++)
 507           if (!isalpha (*ch))
 508             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 509
 510         for (ch = color + 1; *ch; ch++)
 511           if (!islower (*ch))
 512             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 513
 514         if (streq (color, "None"))
 515           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 516
 517         if (isupper (*color))
 518           {
 519             switch (index)
 520               {
 521                 case FOREGROUND:
 522                   *bold = true;
 523                   break;
 524                 case BACKGROUND:
 525                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 526                   break;
 527                 default: /* never reached */
 528                   ABORT_TRACE ();
 529               }
 530           }
 531
 532         color_names[index] = xcalloc (1, sizeof (struct color_name));
 533
 534         color_names[index]->orig = xstrdup (color);
 535
 536         for (ch = color; *ch; ch++)
 537           *ch = tolower (*ch);
 538
 539         color_names[index]->name = xstrdup (color);
 540       }
 541
 542     RELEASE_VAR (str);
 543
 544     assert (color_names[FOREGROUND]);
 545
 546     if (color_names[BACKGROUND])
 547       {
 548         unsigned int i;
 549         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 550         for (i = 0; i < 2; i++)
 551           {
 552             unsigned int color1 = color_sets[i][0];
 553             unsigned int color2 = color_sets[i][1];
 554             if (CHECK_COLORS_RANDOM (color1, color2))
 555               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 556           }
 557       }
 558
 559     find_color_entries (color_names, colors);
 560     free_color_names (color_names);
 561
 562     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 563       find_color_entry ("default", FOREGROUND, colors);
 564
 565     process_file_option (file_string, file, stream);
 566 }
 567
 568 static void
 569 process_file_option (const char *file_string, const char **file, FILE **stream)
 570 {
 571     if (file_string)
 572       {
 573         if (streq (file_string, "-"))
 574           *stream = stdin;
 575         else
 576           {
 577             FILE *s;
 578             const char *file = file_string;
 579             struct stat sb;
 580             int errno, ret;
 581
 582             errno = 0;
 583             ret = stat (file, &sb);
 584
 585             if (ret == -1)
 586               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 587
 588             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 589               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 590
 591             errno = 0;
 592
 593             s = fopen (file, "r");
 594             if (!s)
 595               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 596             *stream = s;
 597           }
 598         *file = file_string;
 599       }
 600     else
 601       {
 602         *stream = stdin;
 603         *file = "stdin";
 604       }
 605
 606     assert (*stream);
 607 }
 608
 609 #define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
 610     char *current_line, *merged_line = NULL;                     \
 611     if (part_line)                                               \
 612       {                                                          \
 613         merged_line = str_concat (part_line, line);              \
 614         free_null (part_line);                                   \
 615       }                                                          \
 616     current_line = merged_line ? merged_line : (char *)line;     \
 617     if (!check_eof || *current_line != '\0')                     \
 618       print_line (colors, bold, current_line, flags);            \
 619     free (merged_line);                                          \
 620 } while (false);
 621
 622 static void
 623 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream, enum stream_mode mode)
 624 {
 625     char buf[BUF_SIZE], *part_line = NULL;
 626     unsigned int flags = 0;
 627     bool first = false, always = false;
 628
 629     switch (mode)
 630       {
 631         case SCAN_FIRST:
 632           first = true;
 633           break;
 634         case SCAN_ALWAYS:
 635           always = true;
 636           break;
 637         default: /* never reached */
 638           ABORT_TRACE ();
 639       }
 640
 641     while (!feof (stream))
 642       {
 643         size_t bytes_read;
 644         char *eol;
 645         const char *line;
 646         memset (buf, '\0', BUF_SIZE);
 647         bytes_read = fread (buf, 1, BUF_SIZE - 1, stream);
 648         if (bytes_read != (BUF_SIZE - 1) && ferror (stream))
 649           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE - 1, "read");
 650         line = buf;
 651         LOOP: while ((eol = strpbrk (line, "\n\r")))
 652           {
 653             char *p;
 654             if (first || always)
 655               {
 656                 first = false;
 657                 flags &= ~(CR|LF);
 658                 if (*eol == '\r')
 659                   {
 660                     flags |= CR;
 661                     if (*(eol + 1) == '\n')
 662                       flags |= LF;
 663                   }
 664                 else if (*eol == '\n')
 665                   flags |= LF;
 666                 else
 667                   vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 668               }
 669             if (always)
 670               p = eol + SKIP_LINE_ENDINGS (flags);
 671             else /* first */
 672               {
 673                 unsigned int i;
 674                 unsigned int count = sizeof (endings) / sizeof (struct ending);
 675                 for (i = 0; i < count; i++)
 676                   {
 677                     if (flags & endings[i].flags)
 678                       {
 679                         char *p;
 680                         if ((p = strstr (eol, endings[i].newline)) && p == eol)
 681                           break;
 682                         else
 683                           {
 684                             always = true;
 685                             goto LOOP;
 686                           }
 687                       }
 688                   }
 689                 p = eol + SKIP_LINE_ENDINGS (flags);
 690               }
 691             *eol = '\0';
 692             MERGE_PRINT_LINE (part_line, line, flags, false);
 693             line = p;
 694           }
 695         if (feof (stream)) {
 696           MERGE_PRINT_LINE (part_line, line, 0, true);
 697         }
 698         else
 699           {
 700             if (!clean && !clean_all) /* efficiency */
 701               print_line (colors, bold, line, 0);
 702             else if (!part_line)
 703               part_line = xstrdup (line);
 704             else
 705               {
 706                 char *merged_line = str_concat (part_line, line);
 707                 free (part_line);
 708                 part_line = merged_line;
 709               }
 710           }
 711       }
 712 }
 713
 714 static void
 715 find_color_entries (struct color_name **color_names, const struct color **colors)
 716 {
 717     struct timeval tv;
 718     unsigned int index;
 719
 720     /* randomness */
 721     gettimeofday (&tv, NULL);
 722     srand (tv.tv_usec * tv.tv_sec);
 723
 724     for (index = 0; color_names[index]; index++)
 725       {
 726         const char *color_name = color_names[index]->name;
 727
 728         const unsigned int count                = tables[index].count;
 729         const struct color *const color_entries = tables[index].entries;
 730
 731         if (streq (color_name, "random"))
 732           {
 733             bool excludable;
 734             unsigned int i;
 735             do {
 736               excludable = false;
 737               i = rand() % (count - 2) + 1; /* omit color none and default */
 738               switch (index)
 739                 {
 740                   case FOREGROUND:
 741                     /* --exclude-random */
 742                     if (exclude && streq (exclude, color_entries[i].name))
 743                       excludable = true;
 744                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 745                       excludable = true;
 746                     break;
 747                   case BACKGROUND:
 748                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 749                       excludable = true;
 750                     break;
 751                   default: /* never reached */
 752                     ABORT_TRACE ();
 753                  }
 754             } while (excludable);
 755             colors[index] = (struct color *)&color_entries[i];
 756           }
 757         else
 758           find_color_entry (color_name, index, colors);
 759       }
 760 }
 761
 762 static void
 763 find_color_entry (const char *const color_name, unsigned int index, const struct color **colors)
 764 {
 765     bool found = false;
 766     unsigned int i;
 767
 768     const unsigned int count                = tables[index].count;
 769     const struct color *const color_entries = tables[index].entries;
 770
 771     for (i = 0; i < count; i++)
 772       if (streq (color_name, color_entries[i].name))
 773         {
 774           colors[index] = (struct color *)&color_entries[i];
 775           found = true;
 776           break;
 777         }
 778     if (!found)
 779       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name, "not recognized");
 780 }
 781
 782 static void
 783 print_line (const struct color **colors, bool bold, const char *const line, unsigned int flags)
 784 {
 785     /* --clean[-all] */
 786     if (clean || clean_all)
 787       print_clean (line);
 788     else
 789       {
 790         /* Foreground color code is guaranteed to be set when background color code is present.  */
 791         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 792           printf ("\033[%s", colors[BACKGROUND]->code);
 793         if (colors[FOREGROUND]->code)
 794           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 795         else
 796           printf (formats[FMT_GENERIC], line);
 797       }
 798     if (flags & CR)
 799       putchar ('\r');
 800     if (flags & LF)
 801       putchar ('\n');
 802 }
 803
 804 static void
 805 print_clean (const char *line)
 806 {
 807     const char *p;
 808     char ***offsets = NULL;
 809     unsigned int count = 0, i = 0;
 810
 811     for (p = line; *p;)
 812       {
 813         /* ESC[ */
 814         if (*p == 27 && *(p + 1) == '[')
 815           {
 816             const char *begin = p;
 817             p += 2;
 818             if (clean_all)
 819               {
 820                 while (isdigit (*p) || *p == ';')
 821                   p++;
 822               }
 823             else if (clean)
 824               {
 825                 bool check_values, first = true;
 826                 if (!isdigit (*p))
 827                   goto END;
 828                 do {
 829                   const char *digit;
 830                   check_values = false;
 831                   if (!first && !isdigit (*p))
 832                     goto DISCARD;
 833                   digit = p;
 834                   while (isdigit (*p))
 835                     p++;
 836                   if (p - digit > 2)
 837                     goto DISCARD;
 838                   else /* check range */
 839                     {
 840                       char val[3];
 841                       int value;
 842                       unsigned int i;
 843                       const unsigned int digits = p - digit;
 844                       for (i = 0; i < digits; i++)
 845                         val[i] = *digit++;
 846                       val[i] = '\0';
 847                       value = atoi (val);
 848                       if (!((value ==  0 || value ==  1)   /* attributes        */
 849                          || (value >= 30 && value <= 37)   /* foreground colors */
 850                          || (value >= 40 && value <= 47)   /* background colors */
 851                          || (value == 39 || value == 49))) /* default colors    */
 852                         goto DISCARD;
 853                     }
 854                   if (*p == ';')
 855                     {
 856                       p++;
 857                       check_values = true;
 858                     }
 859                   first = false;
 860                 } while (check_values);
 861               }
 862             END: if (*p == 'm')
 863               {
 864                 const char *end = p++;
 865                 if (!offsets)
 866                   offsets = xmalloc (++count * sizeof (char **));
 867                 else
 868                   offsets = xrealloc (offsets, ++count * sizeof (char **));
 869                 offsets[i] = xmalloc (2 * sizeof (char *));
 870                 offsets[i][0] = (char *)begin; /* ESC */
 871                 offsets[i][1] = (char *)end;   /* m */
 872                 i++;
 873                 continue;
 874               }
 875             DISCARD:
 876               continue;
 877           }
 878         p++;
 879       }
 880
 881     if (offsets)
 882       print_free_offsets (line, offsets, count);
 883     else
 884       printf (formats[FMT_GENERIC], line);
 885 }
 886
 887 #define SET_CHAR(offset, new, old) \
 888     *old = *offset;                \
 889     *offset = new;                 \
 890
 891 #define RESTORE_CHAR(offset, old)  \
 892     *offset = old;                 \
 893
 894 static void
 895 print_free_offsets (const char *line, char ***offsets, unsigned int count)
 896 {
 897     char ch;
 898     unsigned int i;
 899
 900     SET_CHAR (offsets[0][0], '\0', &ch);
 901     printf (formats[FMT_GENERIC], line);
 902     RESTORE_CHAR (offsets[0][0], ch);
 903
 904     for (i = 0; i < count; i++)
 905       {
 906         char ch;
 907         bool next_offset = false;
 908         if (i + 1 < count)
 909           {
 910             SET_CHAR (offsets[i + 1][0], '\0', &ch);
 911             next_offset = true;
 912           }
 913         printf (formats[FMT_GENERIC], offsets[i][1] + 1);
 914         if (next_offset)
 915           RESTORE_CHAR (offsets[i + 1][0], ch);
 916       }
 917     for (i = 0; i < count; i++)
 918       free_null (offsets[i]);
 919     free_null (offsets);
 920 }
 921
 922 static void *
 923 malloc_wrap (size_t size)
 924 {
 925     void *p = malloc (size);
 926     if (!p)
 927       MEM_ALLOC_FAIL ();
 928     return p;
 929 }
 930
 931 static void *
 932 calloc_wrap (size_t nmemb, size_t size)
 933 {
 934     void *p = calloc (nmemb, size);
 935     if (!p)
 936       MEM_ALLOC_FAIL ();
 937     return p;
 938 }
 939
 940 static void *
 941 realloc_wrap (void *ptr, size_t size)
 942 {
 943     void *p = realloc (ptr, size);
 944     if (!p)
 945       MEM_ALLOC_FAIL ();
 946     return p;
 947 }
 948
 949 static void *
 950 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
 951 {
 952     void *p = malloc (size);
 953     if (!p)
 954       MEM_ALLOC_FAIL_DEBUG (file, line);
 955     return p;
 956 }
 957
 958 static void *
 959 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
 960 {
 961     void *p = calloc (nmemb, size);
 962     if (!p)
 963       MEM_ALLOC_FAIL_DEBUG (file, line);
 964     return p;
 965 }
 966
 967 static void *
 968 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
 969 {
 970     void *p = realloc (ptr, size);
 971     if (!p)
 972       MEM_ALLOC_FAIL_DEBUG (file, line);
 973     return p;
 974 }
 975
 976 static void
 977 free_wrap (void **ptr)
 978 {
 979     free (*ptr);
 980     *ptr = NULL;
 981 }
 982
 983 static char *
 984 strdup_wrap (const char *str)
 985 {
 986     const size_t len = strlen (str) + 1;
 987     char *p = xmalloc (len);
 988     strncpy (p, str, len);
 989     return p;
 990 }
 991
 992 static char *
 993 str_concat (const char *str1, const char *str2)
 994 {
 995     const size_t len = strlen (str1) + strlen (str2) + 1;
 996     char *p, *str;
 997
 998     p = str = xmalloc (len);
 999     strncpy (p, str1, strlen (str1));
1000     p += strlen (str1);
1001     strncpy (p, str2, strlen (str2));
1002     p += strlen (str2);
1003     *p = '\0';
1004
1005     return str;
1006 }
1007
1008 static void
1009 vfprintf_fail (const char *fmt, ...)
1010 {
1011     va_list ap;
1012     fprintf (stderr, "%s: ", program_name);
1013     va_start (ap, fmt);
1014     vfprintf (stderr, fmt, ap);
1015     va_end (ap);
1016     fprintf (stderr, "\n");
1017     exit (EXIT_FAILURE);
1018 }
1019
1020 static void
1021 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1022 {
1023     /* nothing to stack */
1024     if (ptr == NULL)
1025       return;
1026     if (!*list)
1027       *list = xmalloc (sizeof (void *));
1028     else
1029       {
1030         unsigned int i;
1031         for (i = 0; i < *stacked; i++)
1032           if (!(*list)[i])
1033             {
1034               (*list)[i] = ptr;
1035               return; /* reused */
1036             }
1037         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1038       }
1039     (*list)[index] = ptr;
1040     (*stacked)++;
1041 }
1042
1043 static void
1044 release_var (void **list, unsigned int stacked, void **ptr)
1045 {
1046     unsigned int i;
1047     /* nothing to release */
1048     if (*ptr == NULL)
1049       return;
1050     for (i = 0; i < stacked; i++)
1051       if (list[i] == *ptr)
1052         {
1053           free (*ptr);
1054           *ptr = NULL;
1055           list[i] = NULL;
1056           return;
1057         }
1058 }