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 xcalloc(nmemb, size) calloc_wrap_debug(nmemb, size, __FILE__, __LINE__)
  47 # define xrealloc(ptr, size)  realloc_wrap_debug(ptr, size,  __FILE__, __LINE__)
  48 #else
  49 # define xmalloc(size)        malloc_wrap(size)
  50 # define xcalloc(nmemb, size) calloc_wrap(nmemb, size)
  51 # define xrealloc(ptr, size)  realloc_wrap(ptr, size)
  52 #endif
  53
  54 #define free_null(ptr) free_wrap((void **)&ptr)
  55 #define xstrdup(str)   strdup_wrap(str)
  56
  57 #if !defined BUF_SIZE || BUF_SIZE <= 0
  58 # undef BUF_SIZE
  59 # define BUF_SIZE 4096 + 1
  60 #endif
  61
  62 #define LF 0x01
  63 #define CR 0x02
  64
  65 #define SKIP_LINE_ENDINGS(flags) (((flags) & CR) && ((flags) & LF) ? 2 : 1)
  66
  67 #define STACK_VAR(ptr) do {                                   \
  68     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  69 } while (false);
  70
  71 #define RELEASE_VAR(ptr) do {                             \
  72     release_var (vars_list, stacked_vars, (void **)&ptr); \
  73 } while (false);
  74
  75 #define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                               \
  76     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
  77     exit (2);                                                                               \
  78 } while (false);
  79 #define MEM_ALLOC_FAIL() do {                                          \
  80     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  81     exit (2);                                                          \
  82 } while (false);
  83
  84 #define ABORT_TRACE()                                                              \
  85     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
  86     abort ();                                                                      \
  87
  88 #define CHECK_COLORS_RANDOM(color1, color2)        \
  89      streq (color_names[color1]->name, "random")   \
  90  && (streq (color_names[color2]->name, "none")     \
  91   || streq (color_names[color2]->name, "default")) \
  92
  93 #define COLOR_SEP_CHAR '/'
  94
  95 #define VERSION "0.50"
  96
  97 typedef unsigned short bool;
  98
  99 enum { false, true };
 100
 101 struct color_name {
 102     char *name;
 103     char *orig;
 104 };
 105
 106 static struct color_name *color_names[3] = { NULL, NULL, NULL };
 107
 108 struct color {
 109     const char *name;
 110     const char *code;
 111 };
 112
 113 static const struct color fg_colors[] = {
 114     { "none",     NULL },
 115     { "black",   "30m" },
 116     { "red",     "31m" },
 117     { "green",   "32m" },
 118     { "yellow",  "33m" },
 119     { "blue",    "34m" },
 120     { "cyan",    "35m" },
 121     { "magenta", "36m" },
 122     { "white",   "37m" },
 123     { "default", "39m" },
 124 };
 125 static const struct color bg_colors[] = {
 126     { "none",     NULL },
 127     { "black",   "40m" },
 128     { "red",     "41m" },
 129     { "green",   "42m" },
 130     { "yellow",  "43m" },
 131     { "blue",    "44m" },
 132     { "cyan",    "45m" },
 133     { "magenta", "46m" },
 134     { "white",   "47m" },
 135     { "default", "49m" },
 136 };
 137
 138 enum fmts {
 139     FMT_GENERIC,
 140     FMT_COLOR,
 141     FMT_RANDOM,
 142     FMT_ERROR,
 143     FMT_FILE
 144 };
 145 static const char *formats[] = {
 146     "%s",                    /* generic */
 147     "%s color '%s' %s",      /* color   */
 148     "%s color '%s' %s '%s'", /* random  */
 149     "less than %u bytes %s", /* error   */
 150     "%s: %s",                /* file    */
 151 };
 152
 153 enum { FOREGROUND, BACKGROUND };
 154
 155 static const struct {
 156     struct color const *entries;
 157     unsigned int count;
 158     const char *desc;
 159 } tables[] = {
 160     { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
 161     { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
 162 };
 163
 164 enum stream_mode { SCAN_FIRST = 1, SCAN_ALWAYS };
 165
 166 struct ending {
 167     unsigned int flags;
 168     const char newline[3];
 169 };
 170
 171 static const struct ending endings[] = {
 172     { CR & LF, "\r\n" },
 173     { CR,      "\r"   },
 174     { LF,      "\n"   },
 175 };
 176
 177 static FILE *stream = NULL;
 178
 179 static unsigned int stacked_vars = 0;
 180 static void **vars_list = NULL;
 181
 182 static bool clean = false;
 183 static bool clean_all = false;
 184
 185 static char *exclude = NULL;
 186
 187 static const char *program_name;
 188
 189 static void print_help (void);
 190 static void print_version (void);
 191 static void cleanup (void);
 192 static void free_color_names (struct color_name **);
 193 static void process_options (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
 194 static void process_file_option (const char *, const char **, FILE **);
 195 static void read_print_stream (bool, const struct color **, const char *, FILE *, enum stream_mode);
 196 static void find_color_entries (struct color_name **, const struct color **);
 197 static void find_color_entry (const char *const, unsigned int, const struct color **);
 198 static void print_line (const struct color **, bool, const char * const, unsigned int);
 199 static void print_clean (const char *);
 200 static void print_free_offsets (const char *, char ***, unsigned int);
 201 static void *malloc_wrap (size_t);
 202 static void *calloc_wrap (size_t, size_t);
 203 static void *realloc_wrap (void *, size_t);
 204 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 205 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 206 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 207 static void free_wrap (void **);
 208 static char *strdup_wrap (const char *);
 209 static char *str_concat (const char *, const char *);
 210 static void vfprintf_fail (const char *, ...);
 211 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 212 static void release_var (void **, unsigned int, void **);
 213
 214 #define SET_OPT_TYPE(type) \
 215     opt_type = type;       \
 216     opt = 0;               \
 217     goto PARSE_OPT;        \
 218
 219 extern char *optarg;
 220 extern int optind;
 221
 222 int
 223 main (int argc, char **argv)
 224 {
 225     unsigned int arg_cnt = 0;
 226
 227     enum {
 228         OPT_CLEAN = 1,
 229         OPT_CLEAN_ALL,
 230         OPT_EXCLUDE_RANDOM,
 231         OPT_HELP,
 232         OPT_VERSION
 233     };
 234
 235     int opt, opt_type = 0;
 236     struct option long_opts[] = {
 237         { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 238         { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
 239         { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 240         { "help",           no_argument,       &opt_type, OPT_HELP           },
 241         { "version",        no_argument,       &opt_type, OPT_VERSION        },
 242         {  0,               0,                 0,         0                  },
 243     };
 244
 245     bool bold = false;
 246
 247     const struct color *colors[2] = {
 248         NULL, /* foreground */
 249         NULL, /* background */
 250     };
 251
 252     const char *file;
 253
 254     enum stream_mode mode = SCAN_FIRST;
 255
 256     program_name = argv[0];
 257     atexit (cleanup);
 258
 259     setvbuf (stdout, NULL, _IOLBF, 0);
 260
 261     while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
 262       {
 263         PARSE_OPT:
 264         switch (opt)
 265           {
 266             case 0: /* long opts */
 267               switch (opt_type)
 268                 {
 269                   case OPT_CLEAN:
 270                     clean = true;
 271                     break;
 272                   case OPT_CLEAN_ALL:
 273                     clean_all = true;
 274                     break;
 275                   case OPT_EXCLUDE_RANDOM: {
 276                     char *p;
 277                     exclude = xstrdup (optarg);
 278                     STACK_VAR (exclude);
 279                     for (p = exclude; *p; p++)
 280                       *p = tolower (*p);
 281                     if (streq (exclude, "random"))
 282                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a color");
 283                     break;
 284                   }
 285                   case OPT_HELP:
 286                     print_help ();
 287                     exit (EXIT_SUCCESS);
 288                   case OPT_VERSION:
 289                     print_version ();
 290                     exit (EXIT_SUCCESS);
 291                   default: /* never reached */
 292                     ABORT_TRACE ();
 293                 }
 294               break;
 295             case 'h':
 296               SET_OPT_TYPE (OPT_HELP);
 297             case 'v':
 298               SET_OPT_TYPE (OPT_VERSION);
 299             case '?':
 300               print_help ();
 301               exit (EXIT_FAILURE);
 302             default: /* never reached */
 303               ABORT_TRACE ();
 304           }
 305       }
 306
 307     arg_cnt = argc - optind;
 308
 309     if (clean || clean_all)
 310       {
 311         if (arg_cnt > 1)
 312           {
 313             const char *format = "%s %s";
 314             const char *message = "switch cannot be used with more than one file";
 315             if (clean)
 316               vfprintf_fail (format, "--clean", message);
 317             else if (clean_all)
 318               vfprintf_fail (format, "--clean-all", message);
 319           }
 320       }
 321     else
 322       {
 323         if (arg_cnt == 0 || arg_cnt > 2)
 324           {
 325             print_help ();
 326             exit (EXIT_FAILURE);
 327           }
 328       }
 329
 330     if (clean || clean_all)
 331       process_file_option (argv[optind], &file, &stream);
 332     else
 333       process_options (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 334     read_print_stream (bold, colors, file, stream, mode);
 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     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 377 #ifdef CFLAGS
 378     c_flags = to_str (CFLAGS);
 379 #else
 380     c_flags = "unknown";
 381 #endif
 382     printf ("Compiler flags: %s\n", c_flags);
 383     printf ("Buffer size: %u bytes\n", BUF_SIZE - 1);
 384 }
 385
 386 static void
 387 cleanup (void)
 388 {
 389     free_color_names (color_names);
 390
 391     if (stream && fileno (stream) != STDIN_FILENO)
 392       fclose (stream);
 393
 394     if (vars_list)
 395       {
 396         unsigned int i;
 397         for (i = 0; i < stacked_vars; i++)
 398           if (vars_list[i])
 399             free_null (vars_list[i]);
 400
 401         free_null (vars_list);
 402       }
 403 }
 404
 405 static void
 406 free_color_names (struct color_name **color_names)
 407 {
 408     unsigned int i;
 409     for (i = 0; color_names[i]; i++)
 410       {
 411         free_null (color_names[i]->name);
 412         free_null (color_names[i]->orig);
 413         free_null (color_names[i]);
 414       }
 415 }
 416
 417 static void
 418 process_options (unsigned int arg_cnt, char **option_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 419 {
 420     int ret;
 421     unsigned int index;
 422     char *color, *p, *str;
 423     struct stat sb;
 424
 425     const char *color_string = arg_cnt >= 1 ? option_strings[0] : NULL;
 426     const char *file_string  = arg_cnt == 2 ? option_strings[1] : NULL;
 427
 428     assert (color_string);
 429
 430     if (streq (color_string, "-"))
 431       {
 432         if (file_string)
 433           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 434         else
 435           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 436       }
 437
 438     ret = stat (color_string, &sb);
 439
 440     /* Ensure that we don't fail if there's a file with one or more
 441        color names in its path.  */
 442     if (ret != -1)
 443       {
 444         bool have_file;
 445         unsigned int c;
 446         const char *color = color_string;
 447
 448         for (c = 1; c <= 2 && *color; c++)
 449           {
 450             bool matched = false;
 451             unsigned int i;
 452             for (i = 0; i < tables[FOREGROUND].count; i++)
 453               {
 454                 const struct color *entry = &tables[FOREGROUND].entries[i];
 455                 char *p;
 456                 if ((p = strstr (color, entry->name)) && p == color)
 457                   {
 458                     color = p + strlen (entry->name);
 459                     matched = true;
 460                     break;
 461                   }
 462               }
 463             if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 464               color++;
 465             else
 466               break;
 467           }
 468
 469         have_file = (*color != '\0');
 470
 471         if (have_file)
 472           {
 473             if (file_string)
 474               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 475             else
 476               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 477           }
 478       }
 479
 480     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 481       {
 482         if (p == color_string)
 483           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 484         else if (p == color_string + strlen (color_string) - 1)
 485           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 486         else if (strchr (++p, COLOR_SEP_CHAR))
 487           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 488       }
 489
 490     str = xstrdup (color_string);
 491     STACK_VAR (str);
 492
 493     for (index = 0, color = str; *color; index++, color = p)
 494       {
 495         char *ch, *sep;
 496         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 497           {
 498             *sep = '\0';
 499             p = sep + 1;
 500           }
 501         else
 502           p = color + strlen (color);
 503
 504         for (ch = color; *ch; ch++)
 505           if (!isalpha (*ch))
 506             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 507
 508         for (ch = color + 1; *ch; ch++)
 509           if (!islower (*ch))
 510             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 511
 512         if (streq (color, "None"))
 513           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 514
 515         if (isupper (*color))
 516           {
 517             switch (index)
 518               {
 519                 case FOREGROUND:
 520                   *bold = true;
 521                   break;
 522                 case BACKGROUND:
 523                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 524                   break;
 525                 default: /* never reached */
 526                   ABORT_TRACE ();
 527               }
 528           }
 529
 530         color_names[index] = xcalloc (1, sizeof (struct color_name));
 531
 532         color_names[index]->orig = xstrdup (color);
 533
 534         for (ch = color; *ch; ch++)
 535           *ch = tolower (*ch);
 536
 537         color_names[index]->name = xstrdup (color);
 538       }
 539
 540     RELEASE_VAR (str);
 541
 542     assert (color_names[FOREGROUND]);
 543
 544     if (color_names[BACKGROUND])
 545       {
 546         unsigned int i;
 547         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 548         for (i = 0; i < 2; i++)
 549           {
 550             unsigned int color1 = color_sets[i][0];
 551             unsigned int color2 = color_sets[i][1];
 552             if (CHECK_COLORS_RANDOM (color1, color2))
 553               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 554           }
 555       }
 556
 557     find_color_entries (color_names, colors);
 558     free_color_names (color_names);
 559
 560     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 561       find_color_entry ("default", FOREGROUND, colors);
 562
 563     process_file_option (file_string, file, stream);
 564 }
 565
 566 static void
 567 process_file_option (const char *file_string, const char **file, FILE **stream)
 568 {
 569     if (file_string)
 570       {
 571         if (streq (file_string, "-"))
 572           *stream = stdin;
 573         else
 574           {
 575             FILE *s;
 576             const char *file = file_string;
 577             struct stat sb;
 578             int errno, ret;
 579
 580             errno = 0;
 581             ret = stat (file, &sb);
 582
 583             if (ret == -1)
 584               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 585
 586             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 587               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 588
 589             errno = 0;
 590
 591             s = fopen (file, "r");
 592             if (!s)
 593               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 594             *stream = s;
 595           }
 596         *file = file_string;
 597       }
 598     else
 599       {
 600         *stream = stdin;
 601         *file = "stdin";
 602       }
 603
 604     assert (*stream);
 605 }
 606
 607 #define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
 608     char *current_line, *merged_line = NULL;                     \
 609     if (part_line)                                               \
 610       {                                                          \
 611         merged_line = str_concat (part_line, line);              \
 612         free_null (part_line);                                   \
 613       }                                                          \
 614     current_line = merged_line ? merged_line : (char *)line;     \
 615     if (!check_eof || *current_line != '\0')                     \
 616       print_line (colors, bold, current_line, flags);            \
 617     free (merged_line);                                          \
 618 } while (false);
 619
 620 static void
 621 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream, enum stream_mode mode)
 622 {
 623     char buf[BUF_SIZE], *part_line = NULL;
 624     unsigned int flags = 0;
 625     bool first = false, always = false;
 626
 627     switch (mode)
 628       {
 629         case SCAN_FIRST:
 630           first = true;
 631           break;
 632         case SCAN_ALWAYS:
 633           always = true;
 634           break;
 635         default: /* never reached */
 636           ABORT_TRACE ();
 637       }
 638
 639     while (!feof (stream))
 640       {
 641         size_t bytes_read;
 642         char *eol;
 643         const char *line;
 644         memset (buf, '\0', BUF_SIZE);
 645         bytes_read = fread (buf, 1, BUF_SIZE - 1, stream);
 646         if (bytes_read != (BUF_SIZE - 1) && ferror (stream))
 647           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE - 1, "read");
 648         line = buf;
 649         LOOP: while ((eol = strpbrk (line, "\n\r")))
 650           {
 651             char *p;
 652             if (first || always)
 653               {
 654                 first = false;
 655                 flags &= ~(CR|LF);
 656                 if (*eol == '\r')
 657                   {
 658                     flags |= CR;
 659                     if (*(eol + 1) == '\n')
 660                       flags |= LF;
 661                   }
 662                 else if (*eol == '\n')
 663                   flags |= LF;
 664                 else
 665                   vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 666               }
 667             if (always)
 668               p = eol + SKIP_LINE_ENDINGS (flags);
 669             else /* first */
 670               {
 671                 unsigned int i;
 672                 unsigned int count = sizeof (endings) / sizeof (struct ending);
 673                 for (i = 0; i < count; i++)
 674                   {
 675                     if (flags & endings[i].flags)
 676                       {
 677                         char *p;
 678                         if ((p = strstr (eol, endings[i].newline)) && p == eol)
 679                           break;
 680                         else
 681                           {
 682                             always = true;
 683                             goto LOOP;
 684                           }
 685                       }
 686                   }
 687                 p = eol + SKIP_LINE_ENDINGS (flags);
 688               }
 689             *eol = '\0';
 690             MERGE_PRINT_LINE (part_line, line, flags, false);
 691             line = p;
 692           }
 693         if (feof (stream)) {
 694           MERGE_PRINT_LINE (part_line, line, 0, true);
 695         }
 696         else
 697           {
 698             if (!clean && !clean_all) /* efficiency */
 699               print_line (colors, bold, line, 0);
 700             else if (!part_line)
 701               part_line = xstrdup (line);
 702             else
 703               {
 704                 char *merged_line = str_concat (part_line, line);
 705                 free (part_line);
 706                 part_line = merged_line;
 707               }
 708           }
 709       }
 710 }
 711
 712 static void
 713 find_color_entries (struct color_name **color_names, const struct color **colors)
 714 {
 715     struct timeval tv;
 716     unsigned int index;
 717
 718     /* randomness */
 719     gettimeofday (&tv, NULL);
 720     srand (tv.tv_usec * tv.tv_sec);
 721
 722     for (index = 0; color_names[index]; index++)
 723       {
 724         const char *color_name = color_names[index]->name;
 725
 726         const unsigned int count                = tables[index].count;
 727         const struct color *const color_entries = tables[index].entries;
 728
 729         if (streq (color_name, "random"))
 730           {
 731             bool excludable;
 732             unsigned int i;
 733             do {
 734               excludable = false;
 735               i = rand() % (count - 2) + 1; /* omit color none and default */
 736               switch (index)
 737                 {
 738                   case FOREGROUND:
 739                     /* --exclude-random */
 740                     if (exclude && streq (exclude, color_entries[i].name))
 741                       excludable = true;
 742                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 743                       excludable = true;
 744                     break;
 745                   case BACKGROUND:
 746                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 747                       excludable = true;
 748                     break;
 749                   default: /* never reached */
 750                     ABORT_TRACE ();
 751                  }
 752             } while (excludable);
 753             colors[index] = (struct color *)&color_entries[i];
 754           }
 755         else
 756           find_color_entry (color_name, index, colors);
 757       }
 758 }
 759
 760 static void
 761 find_color_entry (const char *const color_name, unsigned int index, const struct color **colors)
 762 {
 763     bool found = false;
 764     unsigned int i;
 765
 766     const unsigned int count                = tables[index].count;
 767     const struct color *const color_entries = tables[index].entries;
 768
 769     for (i = 0; i < count; i++)
 770       if (streq (color_name, color_entries[i].name))
 771         {
 772           colors[index] = (struct color *)&color_entries[i];
 773           found = true;
 774           break;
 775         }
 776     if (!found)
 777       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name, "not recognized");
 778 }
 779
 780 static void
 781 print_line (const struct color **colors, bool bold, const char *const line, unsigned int flags)
 782 {
 783     /* --clean[-all] */
 784     if (clean || clean_all)
 785       print_clean (line);
 786     else
 787       {
 788         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 789           printf ("\033[%s", colors[BACKGROUND]->code);
 790         if (colors[FOREGROUND]->code)
 791           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 792         else
 793           printf (formats[FMT_GENERIC], line);
 794       }
 795     if (flags & CR)
 796       putchar ('\r');
 797     if (flags & LF)
 798       putchar ('\n');
 799 }
 800
 801 static void
 802 print_clean (const char *line)
 803 {
 804     const char *p;
 805     char ***offsets = NULL;
 806     unsigned int count = 0, i = 0;
 807
 808     for (p = line; *p;)
 809       {
 810         /* ESC[ */
 811         if (*p == 27 && *(p + 1) == '[')
 812           {
 813             const char *begin = p;
 814             p += 2;
 815             if (clean_all)
 816               {
 817                 while (isdigit (*p) || *p == ';')
 818                   p++;
 819               }
 820             else if (clean)
 821               {
 822                 bool check_values, first = true;
 823                 if (!isdigit (*p))
 824                   goto END;
 825                 do {
 826                   const char *digit;
 827                   check_values = false;
 828                   if (!first && !isdigit (*p))
 829                     goto DISCARD;
 830                   digit = p;
 831                   while (isdigit (*p))
 832                     p++;
 833                   if (p - digit > 2)
 834                     goto DISCARD;
 835                   else /* check range */
 836                     {
 837                       char val[3];
 838                       int value;
 839                       unsigned int i;
 840                       const unsigned int digits = p - digit;
 841                       for (i = 0; i < digits; i++)
 842                         val[i] = *digit++;
 843                       val[i] = '\0';
 844                       value = atoi (val);
 845                       if (!((value ==  0 || value ==  1)   /* attributes        */
 846                          || (value >= 30 && value <= 37)   /* foreground colors */
 847                          || (value >= 40 && value <= 47)   /* background colors */
 848                          || (value == 39 || value == 49))) /* default colors    */
 849                         goto DISCARD;
 850                     }
 851                   if (*p == ';')
 852                     {
 853                       p++;
 854                       check_values = true;
 855                     }
 856                   first = false;
 857                 } while (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 void
1006 vfprintf_fail (const char *fmt, ...)
1007 {
1008     va_list ap;
1009     fprintf (stderr, "%s: ", program_name);
1010     va_start (ap, fmt);
1011     vfprintf (stderr, fmt, ap);
1012     va_end (ap);
1013     fprintf (stderr, "\n");
1014     exit (EXIT_FAILURE);
1015 }
1016
1017 static void
1018 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1019 {
1020     /* nothing to stack */
1021     if (ptr == NULL)
1022       return;
1023     if (!*list)
1024       *list = xmalloc (sizeof (void *));
1025     else
1026       {
1027         unsigned int i;
1028         for (i = 0; i < *stacked; i++)
1029           if (!(*list)[i])
1030             {
1031               (*list)[i] = ptr;
1032               return; /* reused */
1033             }
1034         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1035       }
1036     (*list)[index] = ptr;
1037     (*stacked)++;
1038 }
1039
1040 static void
1041 release_var (void **list, unsigned int stacked, void **ptr)
1042 {
1043     unsigned int i;
1044     /* nothing to release */
1045     if (*ptr == NULL)
1046       return;
1047     for (i = 0; i < stacked; i++)
1048       if (list[i] == *ptr)
1049         {
1050           free (*ptr);
1051           *ptr = NULL;
1052           list[i] = NULL;
1053           return;
1054         }
1055 }