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 (clean && clean_all)
 314           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 315         if (arg_cnt > 1)
 316           {
 317             const char *format = "%s %s";
 318             const char *message = "switch cannot be used with more than one file";
 319             if (clean)
 320               vfprintf_fail (format, "--clean", message);
 321             else if (clean_all)
 322               vfprintf_fail (format, "--clean-all", message);
 323           }
 324       }
 325     else
 326       {
 327         if (arg_cnt == 0 || arg_cnt > 2)
 328           {
 329             print_help ();
 330             exit (EXIT_FAILURE);
 331           }
 332       }
 333
 334     if (clean || clean_all)
 335       process_file_option (argv[optind], &file, &stream);
 336     else
 337       process_options (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 338     read_print_stream (bold, colors, file, stream, mode);
 339
 340     RELEASE_VAR (exclude);
 341
 342     exit (EXIT_SUCCESS);
 343 }
 344
 345 static void
 346 print_help (void)
 347 {
 348     unsigned int i;
 349
 350     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 351     printf ("\tColors (foreground) (background)\n");
 352     for (i = 0; i < tables[FOREGROUND].count; i++)
 353       {
 354         const struct color *entry = &tables[FOREGROUND].entries[i];
 355         const char *name = entry->name;
 356         const char *code = entry->code;
 357         if (code)
 358           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 359                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 360         else
 361           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 362       }
 363     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 364
 365     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 366     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 367
 368     printf ("\n\tOptions\n");
 369     printf ("\t\t    --clean\n");
 370     printf ("\t\t    --clean-all\n");
 371     printf ("\t\t    --exclude-random\n");
 372     printf ("\t\t-h, --help\n");
 373     printf ("\t\t-v, --version\n\n");
 374 }
 375
 376 static void
 377 print_version (void)
 378 {
 379     const char *c_flags;
 380     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 381 #ifdef CFLAGS
 382     c_flags = to_str (CFLAGS);
 383 #else
 384     c_flags = "unknown";
 385 #endif
 386     printf ("Compiler flags: %s\n", c_flags);
 387     printf ("Buffer size: %u bytes\n", BUF_SIZE - 1);
 388 }
 389
 390 static void
 391 cleanup (void)
 392 {
 393     free_color_names (color_names);
 394
 395     if (stream && fileno (stream) != STDIN_FILENO)
 396       fclose (stream);
 397
 398     if (vars_list)
 399       {
 400         unsigned int i;
 401         for (i = 0; i < stacked_vars; i++)
 402           if (vars_list[i])
 403             free_null (vars_list[i]);
 404
 405         free_null (vars_list);
 406       }
 407 }
 408
 409 static void
 410 free_color_names (struct color_name **color_names)
 411 {
 412     unsigned int i;
 413     for (i = 0; color_names[i]; i++)
 414       {
 415         free_null (color_names[i]->name);
 416         free_null (color_names[i]->orig);
 417         free_null (color_names[i]);
 418       }
 419 }
 420
 421 static void
 422 process_options (unsigned int arg_cnt, char **option_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 423 {
 424     int ret;
 425     unsigned int index;
 426     char *color, *p, *str;
 427     struct stat sb;
 428
 429     const char *color_string = arg_cnt >= 1 ? option_strings[0] : NULL;
 430     const char *file_string  = arg_cnt == 2 ? option_strings[1] : NULL;
 431
 432     assert (color_string);
 433
 434     if (streq (color_string, "-"))
 435       {
 436         if (file_string)
 437           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 438         else
 439           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 440       }
 441
 442     ret = stat (color_string, &sb);
 443
 444     /* Ensure that we don't fail if there's a file with one or more
 445        color names in its path.  */
 446     if (ret != -1)
 447       {
 448         bool have_file;
 449         unsigned int c;
 450         const char *color = color_string;
 451
 452         for (c = 1; c <= 2 && *color; c++)
 453           {
 454             bool matched = false;
 455             unsigned int i;
 456             for (i = 0; i < tables[FOREGROUND].count; i++)
 457               {
 458                 const struct color *entry = &tables[FOREGROUND].entries[i];
 459                 char *p;
 460                 if ((p = strstr (color, entry->name)) && p == color)
 461                   {
 462                     color = p + strlen (entry->name);
 463                     matched = true;
 464                     break;
 465                   }
 466               }
 467             if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 468               color++;
 469             else
 470               break;
 471           }
 472
 473         have_file = (*color != '\0');
 474
 475         if (have_file)
 476           {
 477             if (file_string)
 478               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 479             else
 480               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 481           }
 482       }
 483
 484     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 485       {
 486         if (p == color_string)
 487           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 488         else if (p == color_string + strlen (color_string) - 1)
 489           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 490         else if (strchr (++p, COLOR_SEP_CHAR))
 491           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 492       }
 493
 494     str = xstrdup (color_string);
 495     STACK_VAR (str);
 496
 497     for (index = 0, color = str; *color; index++, color = p)
 498       {
 499         char *ch, *sep;
 500         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 501           {
 502             *sep = '\0';
 503             p = sep + 1;
 504           }
 505         else
 506           p = color + strlen (color);
 507
 508         for (ch = color; *ch; ch++)
 509           if (!isalpha (*ch))
 510             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 511
 512         for (ch = color + 1; *ch; ch++)
 513           if (!islower (*ch))
 514             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 515
 516         if (streq (color, "None"))
 517           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 518
 519         if (isupper (*color))
 520           {
 521             switch (index)
 522               {
 523                 case FOREGROUND:
 524                   *bold = true;
 525                   break;
 526                 case BACKGROUND:
 527                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 528                   break;
 529                 default: /* never reached */
 530                   ABORT_TRACE ();
 531               }
 532           }
 533
 534         color_names[index] = xcalloc (1, sizeof (struct color_name));
 535
 536         color_names[index]->orig = xstrdup (color);
 537
 538         for (ch = color; *ch; ch++)
 539           *ch = tolower (*ch);
 540
 541         color_names[index]->name = xstrdup (color);
 542       }
 543
 544     RELEASE_VAR (str);
 545
 546     assert (color_names[FOREGROUND]);
 547
 548     if (color_names[BACKGROUND])
 549       {
 550         unsigned int i;
 551         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 552         for (i = 0; i < 2; i++)
 553           {
 554             unsigned int color1 = color_sets[i][0];
 555             unsigned int color2 = color_sets[i][1];
 556             if (CHECK_COLORS_RANDOM (color1, color2))
 557               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 558           }
 559       }
 560
 561     find_color_entries (color_names, colors);
 562     free_color_names (color_names);
 563
 564     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 565       find_color_entry ("default", FOREGROUND, colors);
 566
 567     process_file_option (file_string, file, stream);
 568 }
 569
 570 static void
 571 process_file_option (const char *file_string, const char **file, FILE **stream)
 572 {
 573     if (file_string)
 574       {
 575         if (streq (file_string, "-"))
 576           *stream = stdin;
 577         else
 578           {
 579             FILE *s;
 580             const char *file = file_string;
 581             struct stat sb;
 582             int errno, ret;
 583
 584             errno = 0;
 585             ret = stat (file, &sb);
 586
 587             if (ret == -1)
 588               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 589
 590             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 591               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 592
 593             errno = 0;
 594
 595             s = fopen (file, "r");
 596             if (!s)
 597               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 598             *stream = s;
 599           }
 600         *file = file_string;
 601       }
 602     else
 603       {
 604         *stream = stdin;
 605         *file = "stdin";
 606       }
 607
 608     assert (*stream);
 609 }
 610
 611 #define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
 612     char *current_line, *merged_line = NULL;                     \
 613     if (part_line)                                               \
 614       {                                                          \
 615         merged_line = str_concat (part_line, line);              \
 616         free_null (part_line);                                   \
 617       }                                                          \
 618     current_line = merged_line ? merged_line : (char *)line;     \
 619     if (!check_eof || *current_line != '\0')                     \
 620       print_line (colors, bold, current_line, flags);            \
 621     free (merged_line);                                          \
 622 } while (false);
 623
 624 static void
 625 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream, enum stream_mode mode)
 626 {
 627     char buf[BUF_SIZE], *part_line = NULL;
 628     unsigned int flags = 0;
 629     bool first = false, always = false;
 630
 631     switch (mode)
 632       {
 633         case SCAN_FIRST:
 634           first = true;
 635           break;
 636         case SCAN_ALWAYS:
 637           always = true;
 638           break;
 639         default: /* never reached */
 640           ABORT_TRACE ();
 641       }
 642
 643     while (!feof (stream))
 644       {
 645         size_t bytes_read;
 646         char *eol;
 647         const char *line;
 648         memset (buf, '\0', BUF_SIZE);
 649         bytes_read = fread (buf, 1, BUF_SIZE - 1, stream);
 650         if (bytes_read != (BUF_SIZE - 1) && ferror (stream))
 651           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE - 1, "read");
 652         line = buf;
 653         LOOP: while ((eol = strpbrk (line, "\n\r")))
 654           {
 655             char *p;
 656             if (first || always)
 657               {
 658                 first = false;
 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               }
 671             if (always)
 672               p = eol + SKIP_LINE_ENDINGS (flags);
 673             else /* first */
 674               {
 675                 unsigned int i;
 676                 unsigned int count = sizeof (endings) / sizeof (struct ending);
 677                 for (i = 0; i < count; i++)
 678                   {
 679                     if (flags & endings[i].flags)
 680                       {
 681                         char *p;
 682                         if ((p = strstr (eol, endings[i].newline)) && p == eol)
 683                           break;
 684                         else
 685                           {
 686                             always = true;
 687                             goto LOOP;
 688                           }
 689                       }
 690                   }
 691                 p = eol + SKIP_LINE_ENDINGS (flags);
 692               }
 693             *eol = '\0';
 694             MERGE_PRINT_LINE (part_line, line, flags, false);
 695             line = p;
 696           }
 697         if (feof (stream)) {
 698           MERGE_PRINT_LINE (part_line, line, 0, true);
 699         }
 700         else
 701           {
 702             if (!clean && !clean_all) /* efficiency */
 703               print_line (colors, bold, line, 0);
 704             else if (!part_line)
 705               part_line = xstrdup (line);
 706             else
 707               {
 708                 char *merged_line = str_concat (part_line, line);
 709                 free (part_line);
 710                 part_line = merged_line;
 711               }
 712           }
 713       }
 714 }
 715
 716 static void
 717 find_color_entries (struct color_name **color_names, const struct color **colors)
 718 {
 719     struct timeval tv;
 720     unsigned int index;
 721
 722     /* randomness */
 723     gettimeofday (&tv, NULL);
 724     srand (tv.tv_usec * tv.tv_sec);
 725
 726     for (index = 0; color_names[index]; index++)
 727       {
 728         const char *color_name = color_names[index]->name;
 729
 730         const unsigned int count                = tables[index].count;
 731         const struct color *const color_entries = tables[index].entries;
 732
 733         if (streq (color_name, "random"))
 734           {
 735             bool excludable;
 736             unsigned int i;
 737             do {
 738               excludable = false;
 739               i = rand() % (count - 2) + 1; /* omit color none and default */
 740               switch (index)
 741                 {
 742                   case FOREGROUND:
 743                     /* --exclude-random */
 744                     if (exclude && streq (exclude, color_entries[i].name))
 745                       excludable = true;
 746                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 747                       excludable = true;
 748                     break;
 749                   case BACKGROUND:
 750                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 751                       excludable = true;
 752                     break;
 753                   default: /* never reached */
 754                     ABORT_TRACE ();
 755                  }
 756             } while (excludable);
 757             colors[index] = (struct color *)&color_entries[i];
 758           }
 759         else
 760           find_color_entry (color_name, index, colors);
 761       }
 762 }
 763
 764 static void
 765 find_color_entry (const char *const color_name, unsigned int index, const struct color **colors)
 766 {
 767     bool found = false;
 768     unsigned int i;
 769
 770     const unsigned int count                = tables[index].count;
 771     const struct color *const color_entries = tables[index].entries;
 772
 773     for (i = 0; i < count; i++)
 774       if (streq (color_name, color_entries[i].name))
 775         {
 776           colors[index] = (struct color *)&color_entries[i];
 777           found = true;
 778           break;
 779         }
 780     if (!found)
 781       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name, "not recognized");
 782 }
 783
 784 static void
 785 print_line (const struct color **colors, bool bold, const char *const line, unsigned int flags)
 786 {
 787     /* --clean[-all] */
 788     if (clean || clean_all)
 789       print_clean (line);
 790     else
 791       {
 792         /* Foreground color code is guaranteed to be set when background color code is present.  */
 793         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 794           printf ("\033[%s", colors[BACKGROUND]->code);
 795         if (colors[FOREGROUND]->code)
 796           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 797         else
 798           printf (formats[FMT_GENERIC], line);
 799       }
 800     if (flags & CR)
 801       putchar ('\r');
 802     if (flags & LF)
 803       putchar ('\n');
 804 }
 805
 806 static void
 807 print_clean (const char *line)
 808 {
 809     const char *p;
 810     char ***offsets = NULL;
 811     unsigned int count = 0, i = 0;
 812
 813     for (p = line; *p;)
 814       {
 815         /* ESC[ */
 816         if (*p == 27 && *(p + 1) == '[')
 817           {
 818             const char *begin = p;
 819             p += 2;
 820             if (clean_all)
 821               {
 822                 while (isdigit (*p) || *p == ';')
 823                   p++;
 824               }
 825             else if (clean)
 826               {
 827                 bool check_values, first = true;
 828                 if (!isdigit (*p))
 829                   goto END;
 830                 do {
 831                   const char *digit;
 832                   check_values = false;
 833                   if (!first && !isdigit (*p))
 834                     goto DISCARD;
 835                   digit = p;
 836                   while (isdigit (*p))
 837                     p++;
 838                   if (p - digit > 2)
 839                     goto DISCARD;
 840                   else /* check range */
 841                     {
 842                       char val[3];
 843                       int value;
 844                       unsigned int i;
 845                       const unsigned int digits = p - digit;
 846                       for (i = 0; i < digits; i++)
 847                         val[i] = *digit++;
 848                       val[i] = '\0';
 849                       value = atoi (val);
 850                       if (!((value ==  0 || value ==  1)   /* attributes        */
 851                          || (value >= 30 && value <= 37)   /* foreground colors */
 852                          || (value >= 40 && value <= 47)   /* background colors */
 853                          || (value == 39 || value == 49))) /* default colors    */
 854                         goto DISCARD;
 855                     }
 856                   if (*p == ';')
 857                     {
 858                       p++;
 859                       check_values = true;
 860                     }
 861                   first = false;
 862                 } while (check_values);
 863               }
 864             END: if (*p == 'm')
 865               {
 866                 const char *end = p++;
 867                 if (!offsets)
 868                   offsets = xmalloc (++count * sizeof (char **));
 869                 else
 870                   offsets = xrealloc (offsets, ++count * sizeof (char **));
 871                 offsets[i] = xmalloc (2 * sizeof (char *));
 872                 offsets[i][0] = (char *)begin; /* ESC */
 873                 offsets[i][1] = (char *)end;   /* m */
 874                 i++;
 875                 continue;
 876               }
 877             DISCARD:
 878               continue;
 879           }
 880         p++;
 881       }
 882
 883     if (offsets)
 884       print_free_offsets (line, offsets, count);
 885     else
 886       printf (formats[FMT_GENERIC], line);
 887 }
 888
 889 #define SET_CHAR(offset, new, old) \
 890     *old = *offset;                \
 891     *offset = new;                 \
 892
 893 #define RESTORE_CHAR(offset, old)  \
 894     *offset = old;                 \
 895
 896 static void
 897 print_free_offsets (const char *line, char ***offsets, unsigned int count)
 898 {
 899     char ch;
 900     unsigned int i;
 901
 902     SET_CHAR (offsets[0][0], '\0', &ch);
 903     printf (formats[FMT_GENERIC], line);
 904     RESTORE_CHAR (offsets[0][0], ch);
 905
 906     for (i = 0; i < count; i++)
 907       {
 908         char ch;
 909         bool next_offset = false;
 910         if (i + 1 < count)
 911           {
 912             SET_CHAR (offsets[i + 1][0], '\0', &ch);
 913             next_offset = true;
 914           }
 915         printf (formats[FMT_GENERIC], offsets[i][1] + 1);
 916         if (next_offset)
 917           RESTORE_CHAR (offsets[i + 1][0], ch);
 918       }
 919     for (i = 0; i < count; i++)
 920       free_null (offsets[i]);
 921     free_null (offsets);
 922 }
 923
 924 static void *
 925 malloc_wrap (size_t size)
 926 {
 927     void *p = malloc (size);
 928     if (!p)
 929       MEM_ALLOC_FAIL ();
 930     return p;
 931 }
 932
 933 static void *
 934 calloc_wrap (size_t nmemb, size_t size)
 935 {
 936     void *p = calloc (nmemb, size);
 937     if (!p)
 938       MEM_ALLOC_FAIL ();
 939     return p;
 940 }
 941
 942 static void *
 943 realloc_wrap (void *ptr, size_t size)
 944 {
 945     void *p = realloc (ptr, size);
 946     if (!p)
 947       MEM_ALLOC_FAIL ();
 948     return p;
 949 }
 950
 951 static void *
 952 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
 953 {
 954     void *p = malloc (size);
 955     if (!p)
 956       MEM_ALLOC_FAIL_DEBUG (file, line);
 957     return p;
 958 }
 959
 960 static void *
 961 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
 962 {
 963     void *p = calloc (nmemb, size);
 964     if (!p)
 965       MEM_ALLOC_FAIL_DEBUG (file, line);
 966     return p;
 967 }
 968
 969 static void *
 970 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
 971 {
 972     void *p = realloc (ptr, size);
 973     if (!p)
 974       MEM_ALLOC_FAIL_DEBUG (file, line);
 975     return p;
 976 }
 977
 978 static void
 979 free_wrap (void **ptr)
 980 {
 981     free (*ptr);
 982     *ptr = NULL;
 983 }
 984
 985 static char *
 986 strdup_wrap (const char *str)
 987 {
 988     const size_t len = strlen (str) + 1;
 989     char *p = xmalloc (len);
 990     strncpy (p, str, len);
 991     return p;
 992 }
 993
 994 static char *
 995 str_concat (const char *str1, const char *str2)
 996 {
 997     const size_t len = strlen (str1) + strlen (str2) + 1;
 998     char *p, *str;
 999
1000     p = str = xmalloc (len);
1001     strncpy (p, str1, strlen (str1));
1002     p += strlen (str1);
1003     strncpy (p, str2, strlen (str2));
1004     p += strlen (str2);
1005     *p = '\0';
1006
1007     return str;
1008 }
1009
1010 static void
1011 vfprintf_fail (const char *fmt, ...)
1012 {
1013     va_list ap;
1014     fprintf (stderr, "%s: ", program_name);
1015     va_start (ap, fmt);
1016     vfprintf (stderr, fmt, ap);
1017     va_end (ap);
1018     fprintf (stderr, "\n");
1019     exit (EXIT_FAILURE);
1020 }
1021
1022 static void
1023 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1024 {
1025     /* nothing to stack */
1026     if (ptr == NULL)
1027       return;
1028     if (!*list)
1029       *list = xmalloc (sizeof (void *));
1030     else
1031       {
1032         unsigned int i;
1033         for (i = 0; i < *stacked; i++)
1034           if (!(*list)[i])
1035             {
1036               (*list)[i] = ptr;
1037               return; /* reused */
1038             }
1039         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1040       }
1041     (*list)[index] = ptr;
1042     (*stacked)++;
1043 }
1044
1045 static void
1046 release_var (void **list, unsigned int stacked, void **ptr)
1047 {
1048     unsigned int i;
1049     /* nothing to release */
1050     if (*ptr == NULL)
1051       return;
1052     for (i = 0; i < stacked; i++)
1053       if (list[i] == *ptr)
1054         {
1055           free (*ptr);
1056           *ptr = NULL;
1057           list[i] = NULL;
1058           return;
1059         }
1060 }