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) 2011-2014 Steven Schubiger
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 #define _POSIX_C_SOURCE 200809L
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <errno.h>
  26 #include <getopt.h>
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/time.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36
  37 #ifndef DEBUG
  38 # define DEBUG 0
  39 #endif
  40
  41 #define str(arg) #arg
  42 #define to_str(arg) str(arg)
  43
  44 #define streq(s1, s2) (strcmp (s1, s2) == 0)
  45
  46 #if DEBUG
  47 # define xmalloc(size)        malloc_wrap_debug(size,        __FILE__, __LINE__)
  48 # define xcalloc(nmemb, size) calloc_wrap_debug(nmemb, size, __FILE__, __LINE__)
  49 # define xrealloc(ptr, size)  realloc_wrap_debug(ptr, size,  __FILE__, __LINE__)
  50 #else
  51 # define xmalloc(size)        malloc_wrap(size)
  52 # define xcalloc(nmemb, size) calloc_wrap(nmemb, size)
  53 # define xrealloc(ptr, size)  realloc_wrap(ptr, size)
  54 #endif
  55
  56 #define free_null(ptr) free_wrap((void **)&ptr)
  57 #define xstrdup(str)   strdup_wrap(str)
  58
  59 #if BUF_SIZE <= 0
  60 # undef BUF_SIZE
  61 #endif
  62 #ifndef BUF_SIZE
  63 # define BUF_SIZE 4096
  64 #endif
  65
  66 #define LF 0x01
  67 #define CR 0x02
  68
  69 #define SKIP_LINE_ENDINGS(flags) (((flags) & CR) && ((flags) & LF) ? 2 : 1)
  70
  71 #define STACK_VAR(ptr) do {                                   \
  72     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  73 } while (false)
  74
  75 #define RELEASE_VAR(ptr) do {                             \
  76     release_var (vars_list, stacked_vars, (void **)&ptr); \
  77 } while (false)
  78
  79 #define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                               \
  80     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
  81     exit (2);                                                                               \
  82 } while (false)
  83 #define MEM_ALLOC_FAIL() do {                                          \
  84     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  85     exit (2);                                                          \
  86 } while (false)
  87
  88 #define ABORT_TRACE()                                                              \
  89     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
  90     abort ();                                                                      \
  91
  92 #define CHECK_COLORS_RANDOM(color1, color2)        \
  93      streq (color_names[color1]->name, "random")   \
  94  && (streq (color_names[color2]->name, "none")     \
  95   || streq (color_names[color2]->name, "default")) \
  96
  97 #define COLOR_SEP_CHAR '/'
  98
  99 #define VERSION "0.53"
 100
 101 typedef enum { false, true } bool;
 102
 103 struct color_name {
 104     char *name;
 105     char *orig;
 106 };
 107
 108 static struct color_name *color_names[3] = { NULL, NULL, NULL };
 109
 110 struct color {
 111     const char *name;
 112     const char *code;
 113 };
 114
 115 static const struct color fg_colors[] = {
 116     { "none",     NULL },
 117     { "black",   "30m" },
 118     { "red",     "31m" },
 119     { "green",   "32m" },
 120     { "yellow",  "33m" },
 121     { "blue",    "34m" },
 122     { "magenta", "35m" },
 123     { "cyan",    "36m" },
 124     { "white",   "37m" },
 125     { "default", "39m" },
 126 };
 127 static const struct color bg_colors[] = {
 128     { "none",     NULL },
 129     { "black",   "40m" },
 130     { "red",     "41m" },
 131     { "green",   "42m" },
 132     { "yellow",  "43m" },
 133     { "blue",    "44m" },
 134     { "magenta", "45m" },
 135     { "cyan",    "46m" },
 136     { "white",   "47m" },
 137     { "default", "49m" },
 138 };
 139
 140 enum fmts {
 141     FMT_GENERIC,
 142     FMT_COLOR,
 143     FMT_RANDOM,
 144     FMT_ERROR,
 145     FMT_FILE
 146 };
 147 static const char *formats[] = {
 148     "%s",                    /* generic */
 149     "%s color '%s' %s",      /* color   */
 150     "%s color '%s' %s '%s'", /* random  */
 151     "less than %u bytes %s", /* error   */
 152     "%s: %s",                /* file    */
 153 };
 154
 155 enum { FOREGROUND, BACKGROUND };
 156
 157 static const struct {
 158     struct color const *entries;
 159     unsigned int count;
 160     const char *desc;
 161 } tables[] = {
 162     { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
 163     { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
 164 };
 165
 166 static FILE *stream = NULL;
 167
 168 static unsigned int stacked_vars = 0;
 169 static void **vars_list = NULL;
 170
 171 static bool clean = false;
 172 static bool clean_all = false;
 173
 174 static char *exclude = NULL;
 175
 176 static const char *program_name;
 177
 178 static void print_hint (void);
 179 static void print_help (void);
 180 static void print_version (void);
 181 static void cleanup (void);
 182 static void free_color_names (struct color_name **);
 183 static void process_args (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
 184 static void process_file_arg (const char *, const char **, FILE **);
 185 static void read_print_stream (bool, const struct color **, const char *, FILE *);
 186 static void find_color_entries (struct color_name **, const struct color **);
 187 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 188 static void print_line (bool, const struct color **, const char * const, unsigned int);
 189 static void print_clean (const char *);
 190 static void print_free_offsets (const char *, char ***, unsigned int);
 191 static void *malloc_wrap (size_t);
 192 static void *calloc_wrap (size_t, size_t);
 193 static void *realloc_wrap (void *, size_t);
 194 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 195 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 196 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 197 static void free_wrap (void **);
 198 static char *strdup_wrap (const char *);
 199 static char *str_concat (const char *, const char *);
 200 static bool has_color_name (const char *, const char *);
 201 static void vfprintf_diag (const char *, ...);
 202 static void vfprintf_fail (const char *, ...);
 203 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 204 static void release_var (void **, unsigned int, void **);
 205
 206 #define SET_OPT_TYPE(type) \
 207     opt_type = type;       \
 208     opt = 0;               \
 209     goto PARSE_OPT;        \
 210
 211 extern char *optarg;
 212 extern int optind;
 213
 214 static int opt_type = 0;
 215
 216 int
 217 main (int argc, char **argv)
 218 {
 219     unsigned int arg_cnt = 0;
 220
 221     enum {
 222         OPT_CLEAN = 1,
 223         OPT_CLEAN_ALL,
 224         OPT_EXCLUDE_RANDOM,
 225         OPT_HELP,
 226         OPT_VERSION
 227     };
 228
 229     int opt;
 230     struct option long_opts[] = {
 231         { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 232         { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
 233         { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 234         { "help",           no_argument,       &opt_type, OPT_HELP           },
 235         { "version",        no_argument,       &opt_type, OPT_VERSION        },
 236         {  NULL,            0,                 NULL,      0                  },
 237     };
 238
 239     bool bold = false;
 240
 241     const struct color *colors[2] = {
 242         NULL, /* foreground */
 243         NULL, /* background */
 244     };
 245
 246     const char *file = NULL;
 247
 248     program_name = argv[0];
 249     atexit (cleanup);
 250
 251     setvbuf (stdout, NULL, _IOLBF, 0);
 252
 253     while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
 254       {
 255         PARSE_OPT:
 256         switch (opt)
 257           {
 258             case 0: /* long opts */
 259               switch (opt_type)
 260                 {
 261                   case OPT_CLEAN:
 262                     clean = true;
 263                     break;
 264                   case OPT_CLEAN_ALL:
 265                     clean_all = true;
 266                     break;
 267                   case OPT_EXCLUDE_RANDOM: {
 268                     bool valid = false;
 269                     unsigned int i;
 270                     exclude = xstrdup (optarg);
 271                     STACK_VAR (exclude);
 272                     for (i = 1; i < tables[FOREGROUND].count - 1; i++) /* skip color none and default */
 273                       {
 274                         const struct color *entry = &tables[FOREGROUND].entries[i];
 275                         if (streq (exclude, entry->name))
 276                           {
 277                             valid = true;
 278                             break;
 279                           }
 280                       }
 281                     if (!valid)
 282                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain 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_hint ();
 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 (clean && clean_all)
 312           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 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             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
 328             print_hint ();
 329             exit (EXIT_FAILURE);
 330           }
 331       }
 332
 333     if (clean || clean_all)
 334       process_file_arg (argv[optind], &file, &stream);
 335     else
 336       process_args (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
 337     read_print_stream (bold, colors, file, stream);
 338
 339     RELEASE_VAR (exclude);
 340
 341     exit (EXIT_SUCCESS);
 342 }
 343
 344 static void
 345 print_hint (void)
 346 {
 347     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 348 }
 349
 350 static void
 351 print_help (void)
 352 {
 353     unsigned int i;
 354
 355     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 356     printf ("\tColors (foreground) (background)\n");
 357     for (i = 0; i < tables[FOREGROUND].count; i++)
 358       {
 359         const struct color *entry = &tables[FOREGROUND].entries[i];
 360         const char *name = entry->name;
 361         const char *code = entry->code;
 362         if (code)
 363           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 364                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 365         else
 366           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 367       }
 368     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 369
 370     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 371     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 372
 373     printf ("\n\tOptions\n");
 374     printf ("\t\t    --clean\n");
 375     printf ("\t\t    --clean-all\n");
 376     printf ("\t\t    --exclude-random\n");
 377     printf ("\t\t-h, --help\n");
 378     printf ("\t\t-v, --version\n\n");
 379 }
 380
 381 static void
 382 print_version (void)
 383 {
 384     const char *c_flags;
 385     bool debug;
 386 #ifdef CFLAGS
 387     c_flags = to_str (CFLAGS);
 388 #else
 389     c_flags = "unknown";
 390 #endif
 391 #if DEBUG
 392     debug = true;
 393 #else
 394     debug = false;
 395 #endif
 396     printf ("%s v%s (compiled at %s, %s)\n", "colorize", VERSION, __DATE__, __TIME__);
 397     printf ("Compiler flags: %s\n", c_flags);
 398     printf ("Buffer size: %u bytes\n", BUF_SIZE);
 399     printf ("Debugging: %s\n", debug ? "yes" : "no");
 400 }
 401
 402 static void
 403 cleanup (void)
 404 {
 405     free_color_names (color_names);
 406
 407     if (stream && fileno (stream) != STDIN_FILENO)
 408       fclose (stream);
 409
 410     if (vars_list)
 411       {
 412         unsigned int i;
 413         for (i = 0; i < stacked_vars; i++)
 414           if (vars_list[i])
 415             free_null (vars_list[i]);
 416
 417         free_null (vars_list);
 418       }
 419 }
 420
 421 static void
 422 free_color_names (struct color_name **color_names)
 423 {
 424     unsigned int i;
 425     for (i = 0; color_names[i]; i++)
 426       {
 427         free_null (color_names[i]->name);
 428         free_null (color_names[i]->orig);
 429         free_null (color_names[i]);
 430       }
 431 }
 432
 433 static void
 434 process_args (unsigned int arg_cnt, char **arg_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
 435 {
 436     int ret;
 437     unsigned int index;
 438     char *color, *p, *str;
 439     struct stat sb;
 440
 441     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 442     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 443
 444     assert (color_string);
 445
 446     if (streq (color_string, "-"))
 447       {
 448         if (file_string)
 449           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 450         else
 451           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
 452       }
 453
 454     ret = stat (color_string, &sb);
 455
 456     /* Ensure that we don't fail if there's a file with one or more
 457        color names in its path.  */
 458     if (ret != -1)
 459       {
 460         bool have_file;
 461         unsigned int c;
 462         const char *color = color_string;
 463
 464         for (c = 1; c <= 2 && *color; c++)
 465           {
 466             bool matched = false;
 467             unsigned int i;
 468             for (i = 0; i < tables[FOREGROUND].count; i++)
 469               {
 470                 const struct color *entry = &tables[FOREGROUND].entries[i];
 471                 if (has_color_name (color, entry->name))
 472                   {
 473                     color += strlen (entry->name);
 474                     matched = true;
 475                     break;
 476                   }
 477               }
 478             if (!matched && has_color_name (color, "random"))
 479               {
 480                 color += strlen ("random");
 481                 matched = true;
 482               }
 483             if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 484               color++;
 485             else
 486               break;
 487           }
 488
 489         have_file = (*color != '\0');
 490
 491         if (have_file)
 492           {
 493             if (file_string)
 494               vfprintf_fail (formats[FMT_GENERIC], "file cannot be used as color string");
 495             else
 496               vfprintf_fail (formats[FMT_GENERIC], "file must be preceeded by color string");
 497           }
 498       }
 499
 500     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 501       {
 502         if (p == color_string)
 503           vfprintf_fail (formats[FMT_GENERIC], "foreground color missing");
 504         else if (p == color_string + strlen (color_string) - 1)
 505           vfprintf_fail (formats[FMT_GENERIC], "background color missing");
 506         else if (strchr (++p, COLOR_SEP_CHAR))
 507           vfprintf_fail (formats[FMT_GENERIC], "one color pair allowed only");
 508       }
 509
 510     str = xstrdup (color_string);
 511     STACK_VAR (str);
 512
 513     for (index = 0, color = str; *color; index++, color = p)
 514       {
 515         char *ch, *sep;
 516
 517         p = NULL;
 518         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 519           {
 520             *sep = '\0';
 521             p = sep + 1;
 522           }
 523         else
 524           p = color + strlen (color);
 525         assert (p);
 526
 527         for (ch = color; *ch; ch++)
 528           if (!isalpha (*ch))
 529             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 530
 531         for (ch = color + 1; *ch; ch++)
 532           if (!islower (*ch))
 533             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 534
 535         if (streq (color, "None"))
 536           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 537
 538         if (isupper (*color))
 539           {
 540             switch (index)
 541               {
 542                 case FOREGROUND:
 543                   *bold = true;
 544                   break;
 545                 case BACKGROUND:
 546                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 547                   break;
 548                 default: /* never reached */
 549                   ABORT_TRACE ();
 550               }
 551           }
 552
 553         color_names[index] = xcalloc (1, sizeof (struct color_name));
 554
 555         color_names[index]->orig = xstrdup (color);
 556
 557         for (ch = color; *ch; ch++)
 558           *ch = tolower (*ch);
 559
 560         color_names[index]->name = xstrdup (color);
 561       }
 562
 563     RELEASE_VAR (str);
 564
 565     assert (color_names[FOREGROUND]);
 566
 567     if (color_names[BACKGROUND])
 568       {
 569         unsigned int i;
 570         unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 571         for (i = 0; i < 2; i++)
 572           {
 573             unsigned int color1 = color_sets[i][0];
 574             unsigned int color2 = color_sets[i][1];
 575             if (CHECK_COLORS_RANDOM (color1, color2))
 576               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 577           }
 578       }
 579
 580     find_color_entries (color_names, colors);
 581     free_color_names (color_names);
 582
 583     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 584       {
 585         struct color_name color_name;
 586         color_name.name = color_name.orig = "default";
 587
 588         find_color_entry (&color_name, FOREGROUND, colors);
 589       }
 590
 591     process_file_arg (file_string, file, stream);
 592 }
 593
 594 static void
 595 process_file_arg (const char *file_string, const char **file, FILE **stream)
 596 {
 597     if (file_string)
 598       {
 599         if (streq (file_string, "-"))
 600           *stream = stdin;
 601         else
 602           {
 603             FILE *s;
 604             const char *file = file_string;
 605             struct stat sb;
 606             int errno, ret;
 607
 608             errno = 0;
 609             ret = stat (file, &sb);
 610
 611             if (ret == -1)
 612               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 613
 614             if (!(S_ISREG (sb.st_mode) || S_ISLNK (sb.st_mode) || S_ISFIFO (sb.st_mode)))
 615               vfprintf_fail (formats[FMT_FILE], file, "unrecognized file type");
 616
 617             errno = 0;
 618
 619             s = fopen (file, "r");
 620             if (!s)
 621               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 622             *stream = s;
 623           }
 624         *file = file_string;
 625       }
 626     else
 627       {
 628         *stream = stdin;
 629         *file = "stdin";
 630       }
 631
 632     assert (*stream);
 633     assert (*file);
 634 }
 635
 636 #define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
 637     char *current_line, *merged_line = NULL;                     \
 638     if (part_line)                                               \
 639       {                                                          \
 640         merged_line = str_concat (part_line, line);              \
 641         free_null (part_line);                                   \
 642       }                                                          \
 643     current_line = merged_line ? merged_line : (char *)line;     \
 644     if (!check_eof || *current_line != '\0')                     \
 645       print_line (bold, colors, current_line, flags);            \
 646     free (merged_line);                                          \
 647 } while (false)
 648
 649 static void
 650 read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream)
 651 {
 652     char buf[BUF_SIZE + 1], *part_line = NULL;
 653     unsigned int flags = 0;
 654
 655     while (!feof (stream))
 656       {
 657         size_t bytes_read;
 658         char *eol;
 659         const char *line;
 660         memset (buf, '\0', BUF_SIZE + 1);
 661         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 662         if (bytes_read != BUF_SIZE && ferror (stream))
 663           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 664         line = buf;
 665         while ((eol = strpbrk (line, "\n\r")))
 666           {
 667             char *p;
 668             flags &= ~(CR|LF);
 669             if (*eol == '\r')
 670               {
 671                 flags |= CR;
 672                 if (*(eol + 1) == '\n')
 673                   flags |= LF;
 674               }
 675             else if (*eol == '\n')
 676               flags |= LF;
 677             else
 678               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 679             p = eol + SKIP_LINE_ENDINGS (flags);
 680             *eol = '\0';
 681             MERGE_PRINT_LINE (part_line, line, flags, false);
 682             line = p;
 683           }
 684         if (feof (stream)) {
 685           MERGE_PRINT_LINE (part_line, line, 0, true);
 686         }
 687         else if (*line != '\0')
 688           {
 689             if (!clean && !clean_all) /* efficiency */
 690               print_line (bold, colors, line, 0);
 691             else if (!part_line)
 692               part_line = xstrdup (line);
 693             else
 694               {
 695                 char *merged_line = str_concat (part_line, line);
 696                 free (part_line);
 697                 part_line = merged_line;
 698               }
 699           }
 700       }
 701 }
 702
 703 static void
 704 find_color_entries (struct color_name **color_names, const struct color **colors)
 705 {
 706     struct timeval tv;
 707     unsigned int index;
 708
 709     /* randomness */
 710     gettimeofday (&tv, NULL);
 711     srand (tv.tv_usec * tv.tv_sec);
 712
 713     for (index = 0; color_names[index]; index++)
 714       {
 715         const char *color_name = color_names[index]->name;
 716
 717         const unsigned int count                = tables[index].count;
 718         const struct color *const color_entries = tables[index].entries;
 719
 720         if (streq (color_name, "random"))
 721           {
 722             bool excludable;
 723             unsigned int i;
 724             do {
 725               excludable = false;
 726               i = rand() % (count - 2) + 1; /* omit color none and default */
 727               switch (index)
 728                 {
 729                   case FOREGROUND:
 730                     /* --exclude-random */
 731                     if (exclude && streq (exclude, color_entries[i].name))
 732                       excludable = true;
 733                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
 734                       excludable = true;
 735                     break;
 736                   case BACKGROUND:
 737                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
 738                       excludable = true;
 739                     break;
 740                   default: /* never reached */
 741                     ABORT_TRACE ();
 742                  }
 743             } while (excludable);
 744             colors[index] = (struct color *)&color_entries[i];
 745           }
 746         else
 747           find_color_entry (color_names[index], index, colors);
 748       }
 749 }
 750
 751 static void
 752 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
 753 {
 754     bool found = false;
 755     unsigned int i;
 756
 757     const unsigned int count                = tables[index].count;
 758     const struct color *const color_entries = tables[index].entries;
 759
 760     for (i = 0; i < count; i++)
 761       if (streq (color_name->name, color_entries[i].name))
 762         {
 763           colors[index] = (struct color *)&color_entries[i];
 764           found = true;
 765           break;
 766         }
 767     if (!found)
 768       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
 769 }
 770
 771 static void
 772 print_line (bool bold, const struct color **colors, const char *const line, unsigned int flags)
 773 {
 774     /* --clean[-all] */
 775     if (clean || clean_all)
 776       print_clean (line);
 777     else
 778       {
 779         /* Foreground color code is guaranteed to be set when background color code is present.  */
 780         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
 781           printf ("\033[%s", colors[BACKGROUND]->code);
 782         if (colors[FOREGROUND]->code)
 783           printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
 784         else
 785           printf (formats[FMT_GENERIC], line);
 786       }
 787     if (flags & CR)
 788       putchar ('\r');
 789     if (flags & LF)
 790       putchar ('\n');
 791 }
 792
 793 static void
 794 print_clean (const char *line)
 795 {
 796     const char *p;
 797     char ***offsets = NULL;
 798     unsigned int count = 0, i = 0;
 799
 800     for (p = line; *p;)
 801       {
 802         /* ESC[ */
 803         if (*p == 27 && *(p + 1) == '[')
 804           {
 805             const char *begin = p;
 806             p += 2;
 807             if (clean_all)
 808               {
 809                 while (isdigit (*p) || *p == ';')
 810                   p++;
 811               }
 812             else if (clean)
 813               {
 814                 bool check_values;
 815                 unsigned int iter = 0;
 816                 const char *digit;
 817                 do {
 818                   check_values = false;
 819                   iter++;
 820                   if (!isdigit (*p))
 821                     goto DISCARD;
 822                   digit = p;
 823                   while (isdigit (*p))
 824                     p++;
 825                   if (p - digit > 2)
 826                     goto DISCARD;
 827                   else /* check range */
 828                     {
 829                       char val[3];
 830                       int value;
 831                       unsigned int i;
 832                       const unsigned int digits = p - digit;
 833                       for (i = 0; i < digits; i++)
 834                         val[i] = *digit++;
 835                       val[i] = '\0';
 836                       value = atoi (val);
 837                       if (value == 0) /* reset */
 838                         {
 839                           if (iter > 1)
 840                             goto DISCARD;
 841                           goto END;
 842                         }
 843                       else if (value == 1) /* bold */
 844                         {
 845                           bool discard = false;
 846                           if (iter > 1)
 847                             discard = true;
 848                           else if (*p != ';')
 849                             discard = true;
 850                           if (discard)
 851                             goto DISCARD;
 852                           p++;
 853                           check_values = true;
 854                         }
 855                       else if ((value >= 30 && value <= 37) || value == 39) /* foreground colors */
 856                         goto END;
 857                       else if ((value >= 40 && value <= 47) || value == 49) /* background colors */
 858                         {
 859                           if (iter > 1)
 860                             goto DISCARD;
 861                           goto END;
 862                         }
 863                       else
 864                         goto DISCARD;
 865                     }
 866                 } while (iter == 1 && check_values);
 867               }
 868             END: if (*p == 'm')
 869               {
 870                 const char *end = p++;
 871                 if (!offsets)
 872                   offsets = xmalloc (++count * sizeof (char **));
 873                 else
 874                   offsets = xrealloc (offsets, ++count * sizeof (char **));
 875                 offsets[i] = xmalloc (2 * sizeof (char *));
 876                 offsets[i][0] = (char *)begin; /* ESC */
 877                 offsets[i][1] = (char *)end;   /* m */
 878                 i++;
 879                 continue;
 880               }
 881             DISCARD:
 882               continue;
 883           }
 884         p++;
 885       }
 886
 887     if (offsets)
 888       print_free_offsets (line, offsets, count);
 889     else
 890       printf (formats[FMT_GENERIC], line);
 891 }
 892
 893 #define SET_CHAR(offset, new, old) \
 894     *old = *offset;                \
 895     *offset = new;                 \
 896
 897 #define RESTORE_CHAR(offset, old)  \
 898     *offset = old;                 \
 899
 900 static void
 901 print_free_offsets (const char *line, char ***offsets, unsigned int count)
 902 {
 903     char ch;
 904     unsigned int i;
 905
 906     SET_CHAR (offsets[0][0], '\0', &ch);
 907     printf (formats[FMT_GENERIC], line);
 908     RESTORE_CHAR (offsets[0][0], ch);
 909
 910     for (i = 0; i < count; i++)
 911       {
 912         char ch;
 913         bool next_offset = false;
 914         if (i + 1 < count)
 915           {
 916             SET_CHAR (offsets[i + 1][0], '\0', &ch);
 917             next_offset = true;
 918           }
 919         printf (formats[FMT_GENERIC], offsets[i][1] + 1);
 920         if (next_offset)
 921           RESTORE_CHAR (offsets[i + 1][0], ch);
 922       }
 923     for (i = 0; i < count; i++)
 924       free_null (offsets[i]);
 925     free_null (offsets);
 926 }
 927
 928 static void *
 929 malloc_wrap (size_t size)
 930 {
 931     void *p = malloc (size);
 932     if (!p)
 933       MEM_ALLOC_FAIL ();
 934     return p;
 935 }
 936
 937 static void *
 938 calloc_wrap (size_t nmemb, size_t size)
 939 {
 940     void *p = calloc (nmemb, size);
 941     if (!p)
 942       MEM_ALLOC_FAIL ();
 943     return p;
 944 }
 945
 946 static void *
 947 realloc_wrap (void *ptr, size_t size)
 948 {
 949     void *p = realloc (ptr, size);
 950     if (!p)
 951       MEM_ALLOC_FAIL ();
 952     return p;
 953 }
 954
 955 static void *
 956 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
 957 {
 958     void *p = malloc (size);
 959     if (!p)
 960       MEM_ALLOC_FAIL_DEBUG (file, line);
 961     return p;
 962 }
 963
 964 static void *
 965 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
 966 {
 967     void *p = calloc (nmemb, size);
 968     if (!p)
 969       MEM_ALLOC_FAIL_DEBUG (file, line);
 970     return p;
 971 }
 972
 973 static void *
 974 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
 975 {
 976     void *p = realloc (ptr, size);
 977     if (!p)
 978       MEM_ALLOC_FAIL_DEBUG (file, line);
 979     return p;
 980 }
 981
 982 static void
 983 free_wrap (void **ptr)
 984 {
 985     free (*ptr);
 986     *ptr = NULL;
 987 }
 988
 989 static char *
 990 strdup_wrap (const char *str)
 991 {
 992     const size_t len = strlen (str) + 1;
 993     char *p = xmalloc (len);
 994     strncpy (p, str, len);
 995     return p;
 996 }
 997
 998 static char *
 999 str_concat (const char *str1, const char *str2)
1000 {
1001     const size_t len = strlen (str1) + strlen (str2) + 1;
1002     char *p, *str;
1003
1004     p = str = xmalloc (len);
1005     strncpy (p, str1, strlen (str1));
1006     p += strlen (str1);
1007     strncpy (p, str2, strlen (str2));
1008     p += strlen (str2);
1009     *p = '\0';
1010
1011     return str;
1012 }
1013
1014 static bool
1015 has_color_name (const char *str, const char *name)
1016 {
1017     char *p;
1018
1019     assert (strlen (str));
1020     assert (strlen (name));
1021
1022     if (!(*str == *name || *str == toupper (*name)))
1023       return false;
1024     else if (*(name + 1) != '\0'
1025      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1026       return false;
1027
1028     return true;
1029 }
1030
1031 #define DO_VFPRINTF(fmt)                    \
1032     va_list ap;                             \
1033     fprintf (stderr, "%s: ", program_name); \
1034     va_start (ap, fmt);                     \
1035     vfprintf (stderr, fmt, ap);             \
1036     va_end (ap);                            \
1037     fprintf (stderr, "\n");                 \
1038
1039 static void
1040 vfprintf_diag (const char *fmt, ...)
1041 {
1042     DO_VFPRINTF (fmt);
1043 }
1044
1045 static void
1046 vfprintf_fail (const char *fmt, ...)
1047 {
1048     DO_VFPRINTF (fmt);
1049     exit (EXIT_FAILURE);
1050 }
1051
1052 static void
1053 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1054 {
1055     /* nothing to stack */
1056     if (ptr == NULL)
1057       return;
1058     if (!*list)
1059       *list = xmalloc (sizeof (void *));
1060     else
1061       {
1062         unsigned int i;
1063         for (i = 0; i < *stacked; i++)
1064           if (!(*list)[i])
1065             {
1066               (*list)[i] = ptr;
1067               return; /* reused */
1068             }
1069         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1070       }
1071     (*list)[index] = ptr;
1072     (*stacked)++;
1073 }
1074
1075 static void
1076 release_var (void **list, unsigned int stacked, void **ptr)
1077 {
1078     unsigned int i;
1079     /* nothing to release */
1080     if (*ptr == NULL)
1081       return;
1082     for (i = 0; i < stacked; i++)
1083       if (list[i] == *ptr)
1084         {
1085           free (*ptr);
1086           *ptr = NULL;
1087           list[i] = NULL;
1088           return;
1089         }
1090 }