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