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) 2011-2019 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 _DEFAULT_SOURCE
  23 #define _BSD_SOURCE
  24 #define _XOPEN_SOURCE 700
  25 #define _FILE_OFFSET_BITS 64
  26 #include <assert.h>
  27 #include <ctype.h>
  28 #include <errno.h>
  29 #include <getopt.h>
  30 #include <pwd.h>
  31 #include <stdarg.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <sys/time.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <time.h>
  39 #include <unistd.h>
  40 #include <wordexp.h>
  41
  42 #ifndef DEBUG
  43 # define DEBUG 0
  44 #endif
  45
  46 #define str(arg) #arg
  47 #define to_str(arg) str(arg)
  48
  49 #define streq(s1, s2) (strcmp (s1, s2) == 0)
  50 #define strneq(s1, s2, n) (strncmp (s1, s2, n) == 0)
  51
  52 #if !DEBUG
  53 # define xmalloc(size)          malloc_wrap(size)
  54 # define xcalloc(nmemb, size)   calloc_wrap(nmemb, size)
  55 # define xrealloc(ptr, size)    realloc_wrap(ptr, size)
  56 # define xstrdup(str)           strdup_wrap(str,            NULL, 0)
  57 # define str_concat(str1, str2) str_concat_wrap(str1, str2, NULL, 0)
  58 #else
  59 # define xmalloc(size)          malloc_wrap_debug(size,        __FILE__, __LINE__)
  60 # define xcalloc(nmemb, size)   calloc_wrap_debug(nmemb, size, __FILE__, __LINE__)
  61 # define xrealloc(ptr, size)    realloc_wrap_debug(ptr, size,  __FILE__, __LINE__)
  62 # define xstrdup(str)           strdup_wrap(str,               __FILE__, __LINE__)
  63 # define str_concat(str1, str2) str_concat_wrap(str1, str2,    __FILE__, __LINE__)
  64 #endif
  65
  66 #define free_null(ptr) free_wrap((void **)&ptr)
  67
  68 #if defined(BUF_SIZE) && (BUF_SIZE <= 0 || BUF_SIZE > 65536)
  69 # undef BUF_SIZE
  70 #endif
  71 #ifndef BUF_SIZE
  72 # define BUF_SIZE 4096
  73 #endif
  74
  75 #define LF 0x01
  76 #define CR 0x02
  77
  78 #define COUNT_OF(obj, type) (sizeof (obj) / sizeof (type))
  79
  80 #define SKIP_LINE_ENDINGS(flags) ((flags) == (CR|LF) ? 2 : 1)
  81
  82 #define VALID_FILE_TYPE(mode) (S_ISREG (mode) || S_ISLNK (mode) || S_ISFIFO (mode))
  83
  84 #define STACK_VAR(ptr) do {                                   \
  85     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  86 } while (false)
  87
  88 #define RELEASE_VAR(ptr) do {                             \
  89     release_var (vars_list, stacked_vars, (void **)&ptr); \
  90 } while (false)
  91
  92 #if !DEBUG
  93 # define MEM_ALLOC_FAIL() do {                                         \
  94     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  95     exit (EXIT_FAILURE);                                               \
  96 } while (false)
  97 #else
  98 # define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                              \
  99     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
 100     exit (EXIT_FAILURE);                                                                    \
 101 } while (false)
 102 #endif
 103
 104 #define ABORT_TRACE()                                                              \
 105     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
 106     abort ();
 107
 108 #define CHECK_COLORS_RANDOM(color1, color2)        \
 109      streq (color_names[color1]->name, "random")   \
 110  && (streq (color_names[color2]->name, "none")     \
 111   || streq (color_names[color2]->name, "default"))
 112
 113 #define ALLOC_COMPLETE_PART_LINE 8
 114
 115 #if defined(COLOR_SEP_CHAR_COLON)
 116 # define COLOR_SEP_CHAR ':'
 117 #elif defined(COLOR_SEP_CHAR_SLASH)
 118 # define COLOR_SEP_CHAR '/'
 119 #else
 120 # define COLOR_SEP_CHAR '/'
 121 #endif
 122
 123 #define CONF_FILE ".colorize.conf"
 124
 125 #if DEBUG
 126 # define DEBUG_FILE "debug.txt"
 127 #endif
 128
 129 #define MAX_ATTRIBUTE_CHARS (6 * 2)
 130
 131 #define PROGRAM_NAME "colorize"
 132
 133 #define VERSION "0.65"
 134
 135 typedef enum { false, true } bool;
 136
 137 struct conf {
 138     char *attr;
 139     char *color;
 140     char *exclude_random;
 141     char *omit_color_empty;
 142 };
 143
 144 enum { DESC_OPTION, DESC_CONF };
 145
 146 struct color_name {
 147     char *name;
 148     char *orig;
 149 };
 150
 151 struct color {
 152     const char *name;
 153     const char *code;
 154 };
 155
 156 static const struct color fg_colors[] = {
 157     { "none",     NULL },
 158     { "black",   "30m" },
 159     { "red",     "31m" },
 160     { "green",   "32m" },
 161     { "yellow",  "33m" },
 162     { "blue",    "34m" },
 163     { "magenta", "35m" },
 164     { "cyan",    "36m" },
 165     { "white",   "37m" },
 166     { "default", "39m" },
 167 };
 168 static const struct color bg_colors[] = {
 169     { "none",     NULL },
 170     { "black",   "40m" },
 171     { "red",     "41m" },
 172     { "green",   "42m" },
 173     { "yellow",  "43m" },
 174     { "blue",    "44m" },
 175     { "magenta", "45m" },
 176     { "cyan",    "46m" },
 177     { "white",   "47m" },
 178     { "default", "49m" },
 179 };
 180
 181 struct bytes_size {
 182     unsigned int size;
 183     char unit;
 184 };
 185
 186 enum {
 187     FMT_GENERIC,
 188     FMT_STRING,
 189     FMT_QUOTE,
 190     FMT_COLOR,
 191     FMT_RANDOM,
 192     FMT_ERROR,
 193     FMT_FILE,
 194     FMT_TYPE,
 195     FMT_CONF,
 196     FMT_CONF_FILE
 197 };
 198 static const char *formats[] = {
 199     "%s",                     /* generic   */
 200     "%s '%s'",                /* string    */
 201     "%s `%s' %s",             /* quote     */
 202     "%s color '%s' %s",       /* color     */
 203     "%s color '%s' %s '%s'",  /* random    */
 204     "less than %lu bytes %s", /* error     */
 205     "%s: %s",                 /* file      */
 206     "%s: %s: %s",             /* type      */
 207     "%s: option '%s' %s",     /* conf      */
 208     "config file %s: %s"      /* conf file */
 209 };
 210
 211 enum { GENERIC, FOREGROUND = 0, BACKGROUND };
 212
 213 static const struct {
 214     const struct color *entries;
 215     unsigned int count;
 216     const char *desc;
 217 } tables[] = {
 218     { fg_colors, COUNT_OF (fg_colors, struct color), "foreground" },
 219     { bg_colors, COUNT_OF (bg_colors, struct color), "background" },
 220 };
 221
 222 static unsigned int opts_set;
 223 enum opt_set {
 224     OPT_ATTR_SET = 0x01,
 225     OPT_EXCLUDE_RANDOM_SET = 0x02,
 226     OPT_OMIT_COLOR_EMPTY_SET = 0x04
 227 };
 228 static struct {
 229     char *attr;
 230     char *exclude_random;
 231 } opts_arg = { NULL, NULL };
 232
 233 enum {
 234     OPT_ATTR = 1,
 235     OPT_CLEAN,
 236     OPT_CLEAN_ALL,
 237     OPT_CONFIG,
 238     OPT_EXCLUDE_RANDOM,
 239     OPT_OMIT_COLOR_EMPTY,
 240     OPT_HELP,
 241     OPT_VERSION
 242 };
 243 static int opt_type;
 244 static const struct option long_opts[] = {
 245     { "attr",             required_argument, &opt_type, OPT_ATTR             },
 246     { "clean",            no_argument,       &opt_type, OPT_CLEAN            },
 247     { "clean-all",        no_argument,       &opt_type, OPT_CLEAN_ALL        },
 248     { "config",           required_argument, &opt_type, OPT_CONFIG           },
 249     { "exclude-random",   required_argument, &opt_type, OPT_EXCLUDE_RANDOM   },
 250     { "omit-color-empty", no_argument,       &opt_type, OPT_OMIT_COLOR_EMPTY },
 251     { "help",             no_argument,       &opt_type, OPT_HELP             },
 252     { "version",          no_argument,       &opt_type, OPT_VERSION          },
 253     {  NULL,              0,                 NULL,      0                    },
 254 };
 255
 256 enum attr_type {
 257     ATTR_BOLD = 0x01,
 258     ATTR_UNDERSCORE = 0x02,
 259     ATTR_BLINK = 0x04,
 260     ATTR_REVERSE = 0x08,
 261     ATTR_CONCEALED = 0x10
 262 };
 263 struct attr {
 264     const char *name;
 265     unsigned int val;
 266     enum attr_type type;
 267 };
 268
 269 static FILE *stream;
 270 #if DEBUG
 271 static FILE *log;
 272 #endif
 273
 274 static unsigned int stacked_vars;
 275 static void **vars_list;
 276
 277 static bool clean;
 278 static bool clean_all;
 279 static bool omit_color_empty;
 280
 281 static char attr[MAX_ATTRIBUTE_CHARS + 1];
 282 static char *exclude;
 283
 284 static const char *program_name;
 285
 286 #if DEBUG
 287 static void print_tstamp (FILE *);
 288 #endif
 289 static void process_opts (int, char **, char **);
 290 static void conf_file_path (char **);
 291 static void process_opt_attr (const char *, const bool);
 292 static void write_attr (const struct attr *, unsigned int *, const bool);
 293 static void process_opt_exclude_random (const char *, const bool);
 294 static void parse_conf (const char *, struct conf *);
 295 static void assign_conf (const char *, struct conf *, const char *, char *);
 296 static void init_conf_vars (const struct conf *);
 297 static void init_opts_vars (void);
 298 static void print_hint (void);
 299 static void print_help (void);
 300 static void print_version (void);
 301 static void cleanup (void);
 302 static void free_color_names (struct color_name **);
 303 static void free_conf (struct conf *);
 304 static void process_args (unsigned int, char **, char *, const struct color **, const char **, FILE **, struct conf *);
 305 static void process_file_arg (const char *, const char **, FILE **);
 306 static bool skip_path_colors (const char *, const char *, const struct stat *, const bool);
 307 static void gather_color_names (const char *, char *, struct color_name **);
 308 static void read_print_stream (const char *, const struct color **, const char *, FILE *);
 309 static void merge_print_line (const char *, const char *, FILE *);
 310 static void complete_part_line (const char *, char **, FILE *);
 311 static bool get_next_char (char *, const char **, FILE *, bool *);
 312 static void save_char (char, char **, size_t *, size_t *);
 313 static void find_color_entries (struct color_name **, const struct color **);
 314 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 315 static void print_line (const char *, const struct color **, const char * const, unsigned int, bool);
 316 static void print_clean (const char *);
 317 static bool is_esc (const char *);
 318 static const char *get_end_of_esc (const char *);
 319 static const char *get_end_of_text (const char *);
 320 static void print_text (const char *, size_t);
 321 static bool gather_esc_offsets (const char *, const char **, const char **);
 322 static bool validate_esc_clean_all (const char **);
 323 static bool validate_esc_clean (int, unsigned int, unsigned int *, const char **, bool *);
 324 static bool is_reset (int, unsigned int, const char **);
 325 static bool is_attr (int, unsigned int, unsigned int, const char **);
 326 static bool is_fg_color (int, const char **);
 327 static bool is_bg_color (int, unsigned int, const char **);
 328 #if !DEBUG
 329 static void *malloc_wrap (size_t);
 330 static void *calloc_wrap (size_t, size_t);
 331 static void *realloc_wrap (void *, size_t);
 332 #else
 333 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 334 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 335 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 336 #endif
 337 static void free_wrap (void **);
 338 static char *strdup_wrap (const char *, const char *, unsigned int);
 339 static char *str_concat_wrap (const char *, const char *, const char *, unsigned int);
 340 static char *expand_string (const char *);
 341 static bool get_bytes_size (unsigned long, struct bytes_size *);
 342 static char *get_file_type (mode_t);
 343 static bool has_color_name (const char *, const char *);
 344 static FILE *open_file (const char *, const char *);
 345 static void vfprintf_diag (const char *, ...);
 346 static void vfprintf_fail (const char *, ...);
 347 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 348 static void release_var (void **, unsigned int, void **);
 349
 350 extern int optind;
 351
 352 int
 353 main (int argc, char **argv)
 354 {
 355     unsigned int arg_cnt;
 356
 357     const struct color *colors[2] = {
 358         NULL, /* foreground */
 359         NULL, /* background */
 360     };
 361
 362     const char *file = NULL;
 363
 364     char *conf_file = NULL;
 365     struct conf config = { NULL, NULL, NULL, NULL };
 366
 367     program_name = argv[0];
 368     atexit (cleanup);
 369
 370     setvbuf (stdout, NULL, _IOLBF, 0);
 371
 372 #if DEBUG
 373     log = open_file (DEBUG_FILE, "w");
 374     print_tstamp (log);
 375 #endif
 376
 377     attr[0] = '\0';
 378
 379     process_opts (argc, argv, &conf_file);
 380
 381 #ifdef CONF_FILE_TEST
 382     conf_file = to_str (CONF_FILE_TEST);
 383 #elif !defined(TEST)
 384     if (conf_file == NULL)
 385       conf_file_path (&conf_file);
 386     else
 387       {
 388         char *s;
 389         if ((s = expand_string (conf_file)))
 390           {
 391             free (conf_file);
 392             conf_file = s;
 393           }
 394         errno = 0;
 395         if (access (conf_file, F_OK) == -1)
 396           vfprintf_fail (formats[FMT_CONF_FILE], conf_file, strerror (errno));
 397       }
 398 #endif
 399 #if defined(CONF_FILE_TEST) || !defined(TEST)
 400     if (access (conf_file, F_OK) != -1)
 401       parse_conf (conf_file, &config);
 402 #endif
 403 #if !defined(CONF_FILE_TEST) && !defined(TEST)
 404     free (conf_file);
 405 #endif
 406     init_conf_vars (&config);
 407
 408     init_opts_vars ();
 409
 410     arg_cnt = argc - optind;
 411
 412     if (clean || clean_all)
 413       {
 414         if (clean && clean_all)
 415           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 416         if (arg_cnt > 1)
 417           vfprintf_fail ("--clean%s switch cannot be used with more than one file", clean_all ? "-all" : "");
 418         {
 419           unsigned int i;
 420           const struct option_set {
 421               const char *option;
 422               enum opt_set set;
 423           } options[] = {
 424               { "attr",             OPT_ATTR_SET             },
 425               { "exclude-random",   OPT_EXCLUDE_RANDOM_SET   },
 426               { "omit-color-empty", OPT_OMIT_COLOR_EMPTY_SET },
 427           };
 428           for (i = 0; i < COUNT_OF (options, struct option_set); i++)
 429             if (opts_set & options[i].set)
 430               vfprintf_diag ("--%s switch has no meaning with --clean%s", options[i].option, clean_all ? "-all" : "");
 431         }
 432       }
 433     else
 434       {
 435         if (arg_cnt == 0 || arg_cnt > 2)
 436           {
 437             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
 438             print_hint ();
 439             exit (EXIT_FAILURE);
 440           }
 441       }
 442
 443     if (clean || clean_all)
 444       process_file_arg (argv[optind], &file, &stream);
 445     else
 446       process_args (arg_cnt, &argv[optind], &attr[0], colors, &file, &stream, &config);
 447     read_print_stream (&attr[0], colors, file, stream);
 448
 449     free_conf (&config);
 450
 451     RELEASE_VAR (exclude);
 452
 453     exit (EXIT_SUCCESS);
 454 }
 455
 456 #if DEBUG
 457 static void
 458 print_tstamp (FILE *log)
 459 {
 460     time_t t;
 461     struct tm *tm;
 462     char str[128];
 463     size_t written;
 464
 465     t = time (NULL);
 466     tm = localtime (&t);
 467     if (tm == NULL)
 468       {
 469         perror ("localtime");
 470         exit (EXIT_FAILURE);
 471       }
 472     written = strftime (str, sizeof (str), "%Y-%m-%d %H:%M:%S %Z", tm);
 473     if (written == 0)
 474       vfprintf_fail (formats[FMT_GENERIC], "strftime: 0 returned");
 475
 476     fprintf (log, "%s\n", str);
 477     while (written--)
 478       fprintf (log, "=");
 479     fprintf (log, "\n");
 480 }
 481 #endif
 482
 483 #define DUP_CONFIG()               \
 484     *conf_file = xstrdup (optarg); \
 485     break;
 486
 487 #define PRINT_HELP_EXIT() \
 488     print_help ();        \
 489     exit (EXIT_SUCCESS);
 490
 491 #define PRINT_VERSION_EXIT() \
 492     print_version ();        \
 493     exit (EXIT_SUCCESS);
 494
 495 extern char *optarg;
 496
 497 static void
 498 process_opts (int argc, char **argv, char **conf_file)
 499 {
 500     int opt;
 501     while ((opt = getopt_long (argc, argv, "c:hV", long_opts, NULL)) != -1)
 502       {
 503         switch (opt)
 504           {
 505             case 0: /* long opts */
 506               switch (opt_type)
 507                 {
 508                   case OPT_ATTR:
 509                     opts_set |= OPT_ATTR_SET;
 510                     opts_arg.attr = xstrdup (optarg);
 511                     break;
 512                   case OPT_CLEAN:
 513                     clean = true;
 514                     break;
 515                   case OPT_CLEAN_ALL:
 516                     clean_all = true;
 517                     break;
 518                   case OPT_CONFIG:
 519                     DUP_CONFIG ();
 520                   case OPT_EXCLUDE_RANDOM:
 521                     opts_set |= OPT_EXCLUDE_RANDOM_SET;
 522                     opts_arg.exclude_random = xstrdup (optarg);
 523                     break;
 524                   case OPT_OMIT_COLOR_EMPTY:
 525                     opts_set |= OPT_OMIT_COLOR_EMPTY_SET;
 526                     break;
 527                   case OPT_HELP:
 528                     PRINT_HELP_EXIT ();
 529                   case OPT_VERSION:
 530                     PRINT_VERSION_EXIT ();
 531                   default: /* never reached */
 532                     ABORT_TRACE ();
 533                 }
 534               break;
 535             case 'c':
 536               DUP_CONFIG ();
 537             case 'h':
 538               PRINT_HELP_EXIT ();
 539             case 'V':
 540               PRINT_VERSION_EXIT ();
 541             case '?':
 542               print_hint ();
 543               exit (EXIT_FAILURE);
 544             default: /* never reached */
 545               ABORT_TRACE ();
 546           }
 547       }
 548 }
 549
 550 static void
 551 conf_file_path (char **conf_file)
 552 {
 553     char *path;
 554     uid_t uid;
 555     struct passwd *passwd;
 556     size_t size;
 557
 558     uid = getuid ();
 559     errno = 0;
 560     if ((passwd = getpwuid (uid)) == NULL)
 561       {
 562         if (errno == 0)
 563           vfprintf_diag ("password file entry for uid %lu not found", (unsigned long)uid);
 564         else
 565           perror ("getpwuid");
 566         exit (EXIT_FAILURE);
 567       }
 568     size = strlen (passwd->pw_dir) + 1 + strlen (CONF_FILE) + 1;
 569     path = xmalloc (size);
 570     snprintf (path, size, "%s/%s", passwd->pw_dir, CONF_FILE);
 571
 572     *conf_file = path;
 573 }
 574
 575 static void
 576 process_opt_attr (const char *p, const bool is_opt)
 577 {
 578     /* If attributes are added to this "list", also increase MAX_ATTRIBUTE_CHARS!  */
 579     const struct attr attrs[] = {
 580         { "bold",       1, ATTR_BOLD       },
 581         { "underscore", 4, ATTR_UNDERSCORE },
 582         { "blink",      5, ATTR_BLINK      },
 583         { "reverse",    7, ATTR_REVERSE    },
 584         { "concealed",  8, ATTR_CONCEALED  },
 585     };
 586     unsigned int attr_types = 0;
 587     const char *desc_type[2] = { "--attr switch", "attr conf option" };
 588     const unsigned int DESC_TYPE = is_opt ? DESC_OPTION : DESC_CONF;
 589
 590     while (*p)
 591       {
 592         const char *s;
 593         if (!isalnum (*p))
 594           vfprintf_fail ("%s must be provided a string", desc_type[DESC_TYPE]);
 595         s = p;
 596         while (isalnum (*p))
 597           p++;
 598         if (*p != '\0' && *p != ',')
 599           vfprintf_fail ("%s must have strings separated by ,", desc_type[DESC_TYPE]);
 600         else
 601           {
 602             bool valid_attr = false;
 603             unsigned int i;
 604             for (i = 0; i < COUNT_OF (attrs, struct attr); i++)
 605               {
 606                 const size_t name_len = strlen (attrs[i].name);
 607                 if ((size_t)(p - s) == name_len && strneq (s, attrs[i].name, name_len))
 608                   {
 609                     write_attr (&attrs[i], &attr_types, is_opt);
 610                     valid_attr = true;
 611                     break;
 612                   }
 613               }
 614             if (!valid_attr)
 615               {
 616                 char *attr_invalid = xmalloc ((p - s) + 1);
 617                 STACK_VAR (attr_invalid);
 618                 strncpy (attr_invalid, s, p - s);
 619                 attr_invalid[p - s] = '\0';
 620                 vfprintf_fail ("%s attribute '%s' is not valid", desc_type[DESC_TYPE], attr_invalid);
 621                 RELEASE_VAR (attr_invalid); /* never reached */
 622               }
 623           }
 624         if (*p)
 625           p++;
 626       }
 627 }
 628
 629 static void
 630 write_attr (const struct attr *attr_i, unsigned int *attr_types, const bool is_opt)
 631 {
 632     const unsigned int val = attr_i->val;
 633     const enum attr_type attr_type = attr_i->type;
 634     const char *attr_name = attr_i->name;
 635
 636     if (*attr_types & attr_type)
 637       vfprintf_fail ("%s has attribute '%s' twice or more",
 638                      is_opt ? "--attr switch" : "attr conf option", attr_name);
 639     snprintf (attr + strlen (attr), 3, "%u;", val);
 640     *attr_types |= attr_type;
 641 }
 642
 643 static void
 644 process_opt_exclude_random (const char *s, const bool is_opt)
 645 {
 646     bool valid = false;
 647     unsigned int i;
 648     RELEASE_VAR (exclude);
 649     exclude = xstrdup (s);
 650     STACK_VAR (exclude);
 651     for (i = 1; i < tables[GENERIC].count - 1; i++) /* skip color none and default */
 652       {
 653         const struct color *entry = &tables[GENERIC].entries[i];
 654         if (streq (exclude, entry->name))
 655           {
 656             valid = true;
 657             break;
 658           }
 659       }
 660     if (!valid)
 661       vfprintf_fail ("%s must be provided a plain color",
 662                      is_opt ? "--exclude-random switch" : "exclude-random conf option");
 663 }
 664
 665 static void
 666 init_opts_vars (void)
 667 {
 668     if (opts_set & OPT_ATTR_SET)
 669       {
 670         attr[0] = '\0'; /* Clear attr string to discard values from the config file.  */
 671         process_opt_attr (opts_arg.attr, true);
 672       }
 673     if (opts_set & OPT_EXCLUDE_RANDOM_SET)
 674       process_opt_exclude_random (opts_arg.exclude_random, true);
 675     if (opts_set & OPT_OMIT_COLOR_EMPTY_SET)
 676       omit_color_empty = true;
 677
 678     free (opts_arg.attr);
 679     free (opts_arg.exclude_random);
 680 }
 681
 682 #define IS_SPACE(c) ((c) == ' ' || (c) == '\t')
 683
 684 static void
 685 parse_conf (const char *conf_file, struct conf *config)
 686 {
 687     unsigned int cnt = 0;
 688     char line[256 + 1];
 689     FILE *conf;
 690
 691     conf = open_file (conf_file, "r");
 692
 693     while (fgets (line, sizeof (line), conf))
 694       {
 695         char *cfg, *val;
 696         char *assign, *comment, *opt, *value;
 697         char *p;
 698
 699         cnt++;
 700         if ((p = strchr (line, '\r')) && *(p + 1) != '\n')
 701           vfprintf_fail ("%s: CR ending of line %u is not supported, switch to CRLF/LF instead", conf_file, cnt);
 702         if (strlen (line) > (sizeof (line) - 2))
 703           vfprintf_fail ("%s: line %u exceeds maximum of %u characters", conf_file, cnt, (unsigned int)(sizeof (line) - 2));
 704         if ((p = strpbrk (line, "\n\r")))
 705           *p = '\0';
 706 /* NAME PARSING (start) */
 707         p = line;
 708         /* skip leading spaces and tabs for name */
 709         while (IS_SPACE (*p))
 710           p++;
 711         /* skip line if a) string end, b) comment, [cd]) newline */
 712         if (*p == '\0' || *p == '#' || *p == '\n' || *p == '\r')
 713           continue;
 714         opt = p;
 715         if (!(assign = strchr (opt, '='))) /* check for = */
 716           {
 717             char *s;
 718             if ((s = strpbrk (opt, "# ")))
 719               *s = '\0';
 720             vfprintf_fail (formats[FMT_CONF], conf_file, opt, "not followed by =");
 721           }
 722         p = assign;
 723         /* skip trailing spaces and tabs for name */
 724         while (IS_SPACE (*(p - 1)))
 725           p--;
 726         *p = '\0';
 727 /* NAME PARSING (end) */
 728 /* NAME VALIDATION (start) */
 729         for (p = opt; *p; p++)
 730           if (!isalnum (*p) && *p != '-')
 731             vfprintf_fail (formats[FMT_CONF], conf_file, opt, "cannot be made of non-option characters");
 732 /* NAME VALIDATION (end) */
 733 /* VALUE PARSING (start) */
 734         p = assign + 1;
 735         /* skip leading spaces and tabs for value */
 736         while (IS_SPACE (*p))
 737           p++;
 738         /* skip line if comment */
 739         if (*p == '#')
 740           continue;
 741         value = p;
 742         if ((comment = strchr (p, '#')))
 743           p = comment;
 744         else
 745           p += strlen (p);
 746         /* skip trailing spaces and tabs for value */
 747         while (IS_SPACE (*(p - 1)))
 748           p--;
 749         *p = '\0';
 750 /* VALUE PARSING (end) */
 751
 752         /* save option name */
 753         cfg = xstrdup (opt);
 754         /* save option value (allow empty ones) */
 755         val = strlen (value) ? xstrdup (value) : NULL;
 756
 757         assign_conf (conf_file, config, cfg, val);
 758         free (cfg);
 759       }
 760
 761     fclose (conf);
 762 }
 763
 764 #define ASSIGN_CONF(str,val) do { \
 765     free (str);                   \
 766     str = val;                    \
 767 } while (false)
 768
 769 static void
 770 assign_conf (const char *conf_file, struct conf *config, const char *cfg, char *val)
 771 {
 772     if (streq (cfg, "attr"))
 773       ASSIGN_CONF (config->attr, val);
 774     else if (streq (cfg, "color"))
 775       ASSIGN_CONF (config->color, val);
 776     else if (streq (cfg, "exclude-random"))
 777       ASSIGN_CONF (config->exclude_random, val);
 778     else if (streq (cfg, "omit-color-empty"))
 779       ASSIGN_CONF (config->omit_color_empty, val);
 780     else
 781       vfprintf_fail (formats[FMT_CONF], conf_file, cfg, "not recognized");
 782 }
 783
 784 static void
 785 init_conf_vars (const struct conf *config)
 786 {
 787     if (config->attr)
 788       process_opt_attr (config->attr, false);
 789     if (config->exclude_random)
 790       process_opt_exclude_random (config->exclude_random, false);
 791     if (config->omit_color_empty)
 792       {
 793         if (streq (config->omit_color_empty, "yes"))
 794           omit_color_empty = true;
 795         else if (streq (config->omit_color_empty, "no"))
 796           omit_color_empty = false;
 797         else
 798           vfprintf_fail (formats[FMT_GENERIC], "omit-color-empty conf option is not valid");
 799       }
 800 }
 801
 802 static void
 803 print_hint (void)
 804 {
 805     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 806 }
 807
 808 static void
 809 print_help (void)
 810 {
 811     struct opt_data {
 812         const char *name;
 813         const char *short_opt;
 814         const char *arg;
 815     };
 816     const struct opt_data opts_data[] = {
 817         { "attr",           NULL, "=ATTR1,ATTR2,..." },
 818         { "config",         "c",  "=PATH"            },
 819         { "exclude-random", NULL, "=COLOR"           },
 820         { "help",           "h",  NULL               },
 821         { "version",        "V",  NULL               },
 822     };
 823     const struct option *opt = long_opts;
 824     unsigned int i;
 825
 826     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 827     printf ("\tColors (foreground) (background)\n");
 828     for (i = 0; i < tables[FOREGROUND].count; i++)
 829       {
 830         const struct color *entry = &tables[FOREGROUND].entries[i];
 831         const char *name = entry->name;
 832         const char *code = entry->code;
 833         if (code)
 834           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 835                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 836         else
 837           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 838       }
 839     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 840
 841     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 842     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 843
 844     printf ("\n\tOptions\n");
 845     for (; opt->name; opt++)
 846       {
 847         const struct opt_data *opt_data = NULL;
 848         unsigned int i;
 849         for (i = 0; i < COUNT_OF (opts_data, struct opt_data); i++)
 850           if (streq (opt->name, opts_data[i].name))
 851             {
 852               opt_data = &opts_data[i];
 853               break;
 854             }
 855         if (opt_data)
 856           {
 857             if (opt_data->short_opt)
 858               printf ("\t\t-%s, --%s", opt_data->short_opt, opt->name);
 859             else
 860               printf ("\t\t    --%s", opt->name);
 861             if (opt_data->arg)
 862               printf ("%s", opt_data->arg);
 863             printf ("\n");
 864           }
 865         else
 866           printf ("\t\t    --%s\n", opt->name);
 867       }
 868     printf ("\n");
 869 }
 870
 871 static void
 872 print_version (void)
 873 {
 874 #ifdef HAVE_VERSION
 875 # include "version.h"
 876 #else
 877     const char *const version = NULL;
 878 #endif
 879     const char *version_prefix, *version_string;
 880     const char *c_flags, *ld_flags, *cpp_flags;
 881     const char *const desc_flags_unknown = "unknown";
 882     struct bytes_size bytes_size;
 883     bool debug;
 884 #ifdef CFLAGS
 885     c_flags = to_str (CFLAGS);
 886 #else
 887     c_flags = desc_flags_unknown;
 888 #endif
 889 #ifdef LDFLAGS
 890     ld_flags = to_str (LDFLAGS);
 891 #else
 892     ld_flags = desc_flags_unknown;
 893 #endif
 894 #ifdef CPPFLAGS
 895     cpp_flags = to_str (CPPFLAGS);
 896 #else
 897     cpp_flags = desc_flags_unknown;
 898 #endif
 899 #if DEBUG
 900     debug = true;
 901 #else
 902     debug = false;
 903 #endif
 904     version_prefix = version ? "" : "v";
 905     version_string = version ? version : VERSION;
 906     printf ("%s %s%s (compiled at %s, %s)\n", PROGRAM_NAME, version_prefix, version_string, __DATE__, __TIME__);
 907
 908     printf ("Compiler flags: %s\n", c_flags);
 909     printf ("Linker flags: %s\n", ld_flags);
 910     printf ("Preprocessor flags: %s\n", cpp_flags);
 911     if (get_bytes_size (BUF_SIZE, &bytes_size))
 912       {
 913         if (BUF_SIZE % 1024 == 0)
 914           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 915         else
 916           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 917                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 918       }
 919     else
 920       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 921     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 922     printf ("Debugging: %s\n", debug ? "yes" : "no");
 923 }
 924
 925 static void
 926 cleanup (void)
 927 {
 928     if (stream && fileno (stream) != STDIN_FILENO)
 929       fclose (stream);
 930 #if DEBUG
 931     if (log)
 932       fclose (log);
 933 #endif
 934
 935     if (vars_list)
 936       {
 937         unsigned int i;
 938         for (i = 0; i < stacked_vars; i++)
 939           free (vars_list[i]);
 940         free_null (vars_list);
 941       }
 942 }
 943
 944 static void
 945 free_color_names (struct color_name **color_names)
 946 {
 947     unsigned int i;
 948     for (i = 0; color_names[i]; i++)
 949       {
 950         RELEASE_VAR (color_names[i]->name);
 951         RELEASE_VAR (color_names[i]->orig);
 952         RELEASE_VAR (color_names[i]);
 953       }
 954 }
 955
 956 static void
 957 free_conf (struct conf *config)
 958 {
 959     free (config->attr);
 960     free (config->color);
 961     free (config->exclude_random);
 962     free (config->omit_color_empty);
 963 }
 964
 965 static void
 966 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream, struct conf *config)
 967 {
 968     bool has_hyphen, use_conf_color;
 969     int ret;
 970     char *p;
 971     struct stat sb;
 972     struct color_name *color_names[3] = {
 973         NULL, /* foreground */
 974         NULL, /* background */
 975         NULL, /* sentinel value */
 976     };
 977
 978     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 979     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 980
 981     assert (color_string != NULL);
 982
 983     has_hyphen = streq (color_string, "-");
 984
 985     if (has_hyphen)
 986       {
 987         if (file_string)
 988           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 989         else if (!config->color)
 990           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 991       }
 992
 993     if (!has_hyphen && (ret = lstat (color_string, &sb)) == 0) /* exists */
 994       /* Ensure that we don't fail if there's a file with one or more
 995          color names in its path.  */
 996       use_conf_color = skip_path_colors (color_string, file_string, &sb, !!config->color);
 997     else if (has_hyphen)
 998       use_conf_color = true;
 999     else
1000       use_conf_color = false;
1001
1002     /* Use color from config file.  */
1003     if (arg_cnt == 1 && use_conf_color)
1004       {
1005         file_string = color_string;
1006         color_string = config->color;
1007       }
1008
1009     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
1010       {
1011         if (p == color_string)
1012           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
1013         else if (p == color_string + strlen (color_string) - 1)
1014           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
1015         else if (strchr (++p, COLOR_SEP_CHAR))
1016           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
1017       }
1018
1019     gather_color_names (color_string, attr, color_names);
1020
1021     assert (color_names[FOREGROUND] != NULL);
1022
1023     if (color_names[BACKGROUND])
1024       {
1025         unsigned int i;
1026         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
1027         for (i = 0; i < 2; i++)
1028           {
1029             const unsigned int color1 = color_sets[i][0];
1030             const unsigned int color2 = color_sets[i][1];
1031             if (CHECK_COLORS_RANDOM (color1, color2))
1032               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
1033           }
1034       }
1035
1036     find_color_entries (color_names, colors);
1037     assert (colors[FOREGROUND] != NULL);
1038     free_color_names (color_names);
1039
1040     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
1041       {
1042         struct color_name color_name;
1043         color_name.name = color_name.orig = "default";
1044
1045         find_color_entry (&color_name, FOREGROUND, colors);
1046         assert (colors[FOREGROUND]->code != NULL);
1047       }
1048
1049     process_file_arg (file_string, file, stream);
1050 }
1051
1052 static void
1053 process_file_arg (const char *file_string, const char **file, FILE **stream)
1054 {
1055     if (file_string)
1056       {
1057         if (streq (file_string, "-"))
1058           *stream = stdin;
1059         else
1060           {
1061             const char *file = file_string;
1062             struct stat sb;
1063             int ret;
1064
1065             errno = 0;
1066             ret = stat (file, &sb);
1067
1068             if (ret == -1)
1069               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1070
1071             if (!VALID_FILE_TYPE (sb.st_mode))
1072               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
1073
1074             *stream = open_file (file, "r");
1075           }
1076         *file = file_string;
1077       }
1078     else
1079       {
1080         *stream = stdin;
1081         *file = "stdin";
1082       }
1083
1084     assert (*stream != NULL);
1085     assert (*file != NULL);
1086 }
1087
1088 static bool
1089 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb, const bool has_conf)
1090 {
1091     bool have_file;
1092     unsigned int c;
1093     const char *color = color_string;
1094     const mode_t mode = sb->st_mode;
1095
1096     for (c = 1; c <= 2 && *color; c++)
1097       {
1098         bool matched = false;
1099         unsigned int i;
1100         for (i = 0; i < tables[GENERIC].count; i++)
1101           {
1102             const struct color *entry = &tables[GENERIC].entries[i];
1103             if (has_color_name (color, entry->name))
1104               {
1105                 color += strlen (entry->name);
1106                 matched = true;
1107                 break;
1108               }
1109           }
1110         if (!matched && has_color_name (color, "random"))
1111           {
1112             color += strlen ("random");
1113             matched = true;
1114           }
1115         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
1116           color++;
1117         else
1118           break;
1119       }
1120
1121     have_file = (*color != '\0');
1122
1123     if (have_file)
1124       {
1125         const char *file_existing = color_string;
1126         if (file_string)
1127           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "cannot be used as color string");
1128         else
1129           {
1130             if (VALID_FILE_TYPE (mode))
1131               {
1132                 if (has_conf)
1133                   return true;
1134                 vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "must be preceded by color string");
1135               }
1136             else
1137               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "is not a valid file type");
1138           }
1139       }
1140     return false;
1141 }
1142
1143 static void
1144 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
1145 {
1146     unsigned int index;
1147     char *color, *p, *str;
1148
1149     str = xstrdup (color_string);
1150     STACK_VAR (str);
1151
1152     for (index = 0, color = str; *color; index++, color = p)
1153       {
1154         char *ch, *sep;
1155
1156         p = NULL;
1157         if ((sep = strchr (color, COLOR_SEP_CHAR)))
1158           {
1159             *sep = '\0';
1160             p = sep + 1;
1161           }
1162         else
1163           p = color + strlen (color);
1164         assert (p != NULL);
1165
1166         for (ch = color; *ch; ch++)
1167           if (!isalpha (*ch))
1168             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
1169
1170         for (ch = color + 1; *ch; ch++)
1171           if (!islower (*ch))
1172             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
1173
1174         if (streq (color, "None"))
1175           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
1176
1177         if (isupper (*color))
1178           {
1179             switch (index)
1180               {
1181                 case FOREGROUND:
1182                   snprintf (attr + strlen (attr), 3, "1;");
1183                   break;
1184                 case BACKGROUND:
1185                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
1186                   break;
1187                 default: /* never reached */
1188                   ABORT_TRACE ();
1189               }
1190           }
1191
1192         color_names[index] = xcalloc (1, sizeof (struct color_name));
1193         STACK_VAR (color_names[index]);
1194
1195         color_names[index]->orig = xstrdup (color);
1196         STACK_VAR (color_names[index]->orig);
1197
1198         for (ch = color; *ch; ch++)
1199           *ch = tolower (*ch);
1200
1201         color_names[index]->name = xstrdup (color);
1202         STACK_VAR (color_names[index]->name);
1203       }
1204
1205     RELEASE_VAR (str);
1206 }
1207
1208 static void
1209 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
1210 {
1211     char buf[BUF_SIZE + 1];
1212     unsigned int flags = 0;
1213
1214     while (!feof (stream))
1215       {
1216         size_t bytes_read;
1217         char *eol;
1218         const char *line;
1219         bytes_read = fread (buf, 1, BUF_SIZE, stream);
1220         if (bytes_read != BUF_SIZE && ferror (stream))
1221           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
1222         buf[bytes_read] = '\0';
1223         line = buf;
1224         while ((eol = strpbrk (line, "\n\r")))
1225           {
1226             const bool has_text = (eol > line);
1227             const char *p;
1228             flags &= ~(CR|LF);
1229             if (*eol == '\r')
1230               {
1231                 flags |= CR;
1232                 if (*(eol + 1) == '\n')
1233                   flags |= LF;
1234               }
1235             else if (*eol == '\n')
1236               flags |= LF;
1237             else /* never reached */
1238               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
1239             p = eol + SKIP_LINE_ENDINGS (flags);
1240             *eol = '\0';
1241             print_line (attr, colors, line, flags,
1242                         omit_color_empty ? has_text : true);
1243             line = p;
1244           }
1245         if (feof (stream))
1246           {
1247             if (*line != '\0')
1248               print_line (attr, colors, line, 0, true);
1249           }
1250         else if (*line != '\0')
1251           {
1252             char *p;
1253             if ((clean || clean_all) && (p = strrchr (line, '\033')))
1254               merge_print_line (line, p, stream);
1255             else
1256               print_line (attr, colors, line, 0, true);
1257           }
1258       }
1259 }
1260
1261 static void
1262 merge_print_line (const char *line, const char *p, FILE *stream)
1263 {
1264     char *buf = NULL;
1265     char *merged_esc = NULL;
1266     const char *esc = "";
1267     const char char_restore = *p;
1268
1269     complete_part_line (p + 1, &buf, stream);
1270
1271     if (buf)
1272       {
1273         /* form escape sequence */
1274         esc = merged_esc = str_concat (p, buf);
1275         /* shorten partial line accordingly */
1276         *(char *)p = '\0';
1277         free (buf);
1278       }
1279
1280 #ifdef TEST_MERGE_PART_LINE
1281     printf ("%s%s", line, esc);
1282     fflush (stdout);
1283     _exit (EXIT_SUCCESS);
1284 #else
1285     print_clean (line);
1286     *(char *)p = char_restore;
1287     print_clean (esc);
1288     free (merged_esc);
1289 #endif
1290 }
1291
1292 static void
1293 complete_part_line (const char *p, char **buf, FILE *stream)
1294 {
1295     bool got_next_char = false, read_from_stream;
1296     char ch;
1297     size_t i = 0, size;
1298
1299     if (get_next_char (&ch, &p, stream, &read_from_stream))
1300       {
1301         if (ch == '[')
1302           {
1303             if (read_from_stream)
1304               save_char (ch, buf, &i, &size);
1305           }
1306         else
1307           {
1308             if (read_from_stream)
1309               ungetc ((int)ch, stream);
1310             return; /* cancel */
1311           }
1312       }
1313     else
1314       return; /* cancel */
1315
1316     while (get_next_char (&ch, &p, stream, &read_from_stream))
1317       {
1318         if (isdigit (ch) || ch == ';')
1319           {
1320             if (read_from_stream)
1321               save_char (ch, buf, &i, &size);
1322           }
1323         else /* got next character */
1324           {
1325             got_next_char = true;
1326             break;
1327           }
1328       }
1329
1330     if (got_next_char)
1331       {
1332         if (ch == 'm')
1333           {
1334             if (read_from_stream)
1335               save_char (ch, buf, &i, &size);
1336           }
1337         else
1338           {
1339             if (read_from_stream)
1340               ungetc ((int)ch, stream);
1341             return; /* cancel */
1342           }
1343       }
1344     else
1345       return; /* cancel */
1346 }
1347
1348 static bool
1349 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
1350 {
1351     if (**p == '\0')
1352       {
1353         int c;
1354         if ((c = fgetc (stream)) != EOF)
1355           {
1356             *ch = (char)c;
1357             *read_from_stream = true;
1358             return true;
1359           }
1360         else
1361           {
1362             *read_from_stream = false;
1363             return false;
1364           }
1365       }
1366     else
1367       {
1368         *ch = **p;
1369         (*p)++;
1370         *read_from_stream = false;
1371         return true;
1372       }
1373 }
1374
1375 static void
1376 save_char (char ch, char **buf, size_t *i, size_t *size)
1377 {
1378     if (!*buf)
1379       {
1380         *size = ALLOC_COMPLETE_PART_LINE;
1381         *buf = xmalloc (*size);
1382       }
1383     /* +1: effective occupied size of buffer */
1384     else if ((*i + 1) == *size)
1385       {
1386         *size *= 2;
1387         *buf = xrealloc (*buf, *size);
1388       }
1389     (*buf)[*i] = ch;
1390     (*buf)[*i + 1] = '\0';
1391     (*i)++;
1392 }
1393
1394 static void
1395 find_color_entries (struct color_name **color_names, const struct color **colors)
1396 {
1397     struct timeval tv;
1398     unsigned int index;
1399
1400     /* randomness */
1401     gettimeofday (&tv, NULL);
1402     srand (tv.tv_usec * tv.tv_sec);
1403
1404     for (index = 0; color_names[index]; index++)
1405       {
1406         const char *color_name = color_names[index]->name;
1407
1408         const unsigned int count                = tables[index].count;
1409         const struct color *const color_entries = tables[index].entries;
1410
1411         if (streq (color_name, "random"))
1412           {
1413             bool excludable;
1414             unsigned int i;
1415             do {
1416               excludable = false;
1417               i = rand() % (count - 2) + 1; /* omit color none and default */
1418               switch (index)
1419                 {
1420                   case FOREGROUND:
1421                     /* --exclude-random */
1422                     if (exclude && streq (exclude, color_entries[i].name))
1423                       excludable = true;
1424                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1425                       excludable = true;
1426                     break;
1427                   case BACKGROUND:
1428                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1429                       excludable = true;
1430                     break;
1431                   default: /* never reached */
1432                     ABORT_TRACE ();
1433                  }
1434             } while (excludable);
1435             colors[index] = (struct color *)&color_entries[i];
1436           }
1437         else
1438           find_color_entry (color_names[index], index, colors);
1439       }
1440 }
1441
1442 static void
1443 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1444 {
1445     bool found = false;
1446     unsigned int i;
1447
1448     const unsigned int count                = tables[index].count;
1449     const struct color *const color_entries = tables[index].entries;
1450
1451     for (i = 0; i < count; i++)
1452       if (streq (color_name->name, color_entries[i].name))
1453         {
1454           colors[index] = (struct color *)&color_entries[i];
1455           found = true;
1456           break;
1457         }
1458     if (!found)
1459       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1460 }
1461
1462 static void
1463 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags, bool emit_colors)
1464 {
1465     /* --clean[-all] */
1466     if (clean || clean_all)
1467       print_clean (line);
1468     /* skip for --omit-color-empty? */
1469     else if (emit_colors)
1470       {
1471         /* Foreground color code is guaranteed to be set when background color code is present.  */
1472         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1473           printf ("\033[%s", colors[BACKGROUND]->code);
1474         if (colors[FOREGROUND]->code)
1475           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1476         else
1477           printf (formats[FMT_GENERIC], line);
1478       }
1479     if (flags & CR)
1480       putchar ('\r');
1481     if (flags & LF)
1482       putchar ('\n');
1483 }
1484
1485 static void
1486 print_clean (const char *line)
1487 {
1488     const char *p = line;
1489
1490     if (is_esc (p))
1491       p = get_end_of_esc (p);
1492
1493     while (*p != '\0')
1494       {
1495         const char *text_start = p;
1496         const char *text_end = get_end_of_text (p);
1497         print_text (text_start, text_end - text_start);
1498         p = get_end_of_esc (text_end);
1499       }
1500 }
1501
1502 static bool
1503 is_esc (const char *p)
1504 {
1505     return gather_esc_offsets (p, NULL, NULL);
1506 }
1507
1508 static const char *
1509 get_end_of_esc (const char *p)
1510 {
1511     const char *esc;
1512     const char *end = NULL;
1513     while ((esc = strchr (p, '\033')))
1514       {
1515         if (gather_esc_offsets (esc, NULL, &end))
1516           break;
1517         p = esc + 1;
1518       }
1519     return end ? end + 1 : p + strlen (p);
1520 }
1521
1522 static const char *
1523 get_end_of_text (const char *p)
1524 {
1525     const char *esc;
1526     const char *start = NULL;
1527     while ((esc = strchr (p, '\033')))
1528       {
1529         if (gather_esc_offsets (esc, &start, NULL))
1530           break;
1531         p = esc + 1;
1532       }
1533     return start ? start : p + strlen (p);
1534 }
1535
1536 static void
1537 print_text (const char *p, size_t len)
1538 {
1539     size_t bytes_written;
1540     bytes_written = fwrite (p, 1, len, stdout);
1541     if (bytes_written != len)
1542       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1543 }
1544
1545 static bool
1546 gather_esc_offsets (const char *p, const char **start, const char **end)
1547 {
1548     /* ESC[ */
1549     if (*p == 27 && *(p + 1) == '[')
1550       {
1551         bool valid = false;
1552         const char *const begin = p;
1553         p += 2;
1554         if (clean_all)
1555           valid = validate_esc_clean_all (&p);
1556         else if (clean)
1557           {
1558             bool check_values;
1559             unsigned int prev_iter, iter;
1560             const char *digit;
1561             prev_iter = iter = 0;
1562             do {
1563               check_values = false;
1564               iter++;
1565               if (!isdigit (*p))
1566                 break;
1567               digit = p;
1568               while (isdigit (*p))
1569                 p++;
1570               if (p - digit > 2)
1571                 break;
1572               else /* check range */
1573                 {
1574                   char val[3];
1575                   int value;
1576                   unsigned int i;
1577                   const unsigned int digits = p - digit;
1578                   for (i = 0; i < digits; i++)
1579                     val[i] = *digit++;
1580                   val[i] = '\0';
1581                   value = atoi (val);
1582                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1583                 }
1584             } while (check_values);
1585           }
1586         if (valid)
1587           {
1588             if (start)
1589               *start = begin;
1590             if (end)
1591               *end = p;
1592             return true;
1593           }
1594       }
1595     return false;
1596 }
1597
1598 static bool
1599 validate_esc_clean_all (const char **p)
1600 {
1601     while (isdigit (**p) || **p == ';')
1602       (*p)++;
1603     return (**p == 'm');
1604 }
1605
1606 static bool
1607 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1608 {
1609     if (is_reset (value, iter, p))
1610       return true;
1611     else if (is_attr (value, iter, *prev_iter, p))
1612       {
1613         (*p)++;
1614         *check_values = true;
1615         *prev_iter = iter;
1616         return false; /* partial escape sequence, need another valid value */
1617       }
1618     else if (is_fg_color (value, p))
1619       return true;
1620     else if (is_bg_color (value, iter, p))
1621       return true;
1622     else
1623       return false;
1624 }
1625
1626 static bool
1627 is_reset (int value, unsigned int iter, const char **p)
1628 {
1629     return (value == 0 && iter == 1 && **p == 'm');
1630 }
1631
1632 static bool
1633 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1634 {
1635     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1636 }
1637
1638 static bool
1639 is_fg_color (int value, const char **p)
1640 {
1641     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1642 }
1643
1644 static bool
1645 is_bg_color (int value, unsigned int iter, const char **p)
1646 {
1647     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1648 }
1649
1650 #if !DEBUG
1651 static void *
1652 malloc_wrap (size_t size)
1653 {
1654     void *p = malloc (size);
1655     if (!p)
1656       MEM_ALLOC_FAIL ();
1657     return p;
1658 }
1659
1660 static void *
1661 calloc_wrap (size_t nmemb, size_t size)
1662 {
1663     void *p = calloc (nmemb, size);
1664     if (!p)
1665       MEM_ALLOC_FAIL ();
1666     return p;
1667 }
1668
1669 static void *
1670 realloc_wrap (void *ptr, size_t size)
1671 {
1672     void *p = realloc (ptr, size);
1673     if (!p)
1674       MEM_ALLOC_FAIL ();
1675     return p;
1676 }
1677 #else
1678 static const char *const format_debug = "%s: %10s %7lu bytes [source file %s, line %5u]\n";
1679 static void *
1680 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1681 {
1682     void *p = malloc (size);
1683     if (!p)
1684       MEM_ALLOC_FAIL_DEBUG (file, line);
1685     fprintf (log, format_debug, program_name, "malloc'ed", (unsigned long)size, file, line);
1686     return p;
1687 }
1688
1689 static void *
1690 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1691 {
1692     void *p = calloc (nmemb, size);
1693     if (!p)
1694       MEM_ALLOC_FAIL_DEBUG (file, line);
1695     fprintf (log, format_debug, program_name, "calloc'ed", (unsigned long)(nmemb * size), file, line);
1696     return p;
1697 }
1698
1699 static void *
1700 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1701 {
1702     void *p = realloc (ptr, size);
1703     if (!p)
1704       MEM_ALLOC_FAIL_DEBUG (file, line);
1705     fprintf (log, format_debug, program_name, "realloc'ed", (unsigned long)size, file, line);
1706     return p;
1707 }
1708 #endif /* !DEBUG */
1709
1710 static void
1711 free_wrap (void **ptr)
1712 {
1713     free (*ptr);
1714     *ptr = NULL;
1715 }
1716
1717 #if !DEBUG
1718 # define do_malloc(len, file, line) malloc_wrap(len)
1719 #else
1720 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1721 #endif
1722
1723 static char *
1724 strdup_wrap (const char *str, const char *file, unsigned int line)
1725 {
1726     const size_t len = strlen (str) + 1;
1727     char *p = do_malloc (len, file, line);
1728     strncpy (p, str, len);
1729     return p;
1730 }
1731
1732 static char *
1733 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1734 {
1735     const size_t len = strlen (str1) + strlen (str2) + 1;
1736     char *p, *str;
1737
1738     p = str = do_malloc (len, file, line);
1739     strncpy (p, str1, strlen (str1));
1740     p += strlen (str1);
1741     strncpy (p, str2, strlen (str2));
1742     p += strlen (str2);
1743     *p = '\0';
1744
1745     return str;
1746 }
1747
1748 static char *
1749 expand_string (const char *str)
1750 {
1751     char *s = NULL;
1752     wordexp_t p;
1753
1754     wordexp (str, &p, 0);
1755     if (p.we_wordc >= 1)
1756       s = xstrdup (p.we_wordv[0]);
1757     wordfree (&p);
1758
1759     return s;
1760 }
1761
1762 static bool
1763 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1764 {
1765     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1766     unsigned long size = bytes;
1767     if (bytes < 1024)
1768       return false;
1769     unit = units;
1770     while (size >= 1024 && *(unit + 1))
1771       {
1772         size /= 1024;
1773         unit++;
1774       }
1775     bytes_size->size = (unsigned int)size;
1776     bytes_size->unit = *unit;
1777     return true;
1778 }
1779
1780 static char *
1781 get_file_type (mode_t mode)
1782 {
1783     if (S_ISREG (mode))
1784       return "file";
1785     else if (S_ISDIR (mode))
1786       return "directory";
1787     else if (S_ISCHR (mode))
1788       return "character device";
1789     else if (S_ISBLK (mode))
1790       return "block device";
1791     else if (S_ISFIFO (mode))
1792       return "named pipe";
1793     else if (S_ISLNK (mode))
1794       return "symbolic link";
1795     else if (S_ISSOCK (mode))
1796       return "socket";
1797     else
1798       return "file";
1799 }
1800
1801 static bool
1802 has_color_name (const char *str, const char *name)
1803 {
1804     char *p;
1805
1806     assert (strlen (str) > 0);
1807     assert (strlen (name) > 0);
1808
1809     if (!(*str == *name || *str == toupper (*name)))
1810       return false;
1811     else if (*(name + 1) != '\0'
1812      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1813       return false;
1814     else
1815       return true;
1816 }
1817
1818 static FILE *
1819 open_file (const char *file, const char *mode)
1820 {
1821     FILE *stream;
1822
1823     errno = 0;
1824     stream = fopen (file, mode);
1825     if (!stream)
1826       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1827
1828     return stream;
1829 }
1830
1831 #define DO_VFPRINTF(fmt)                    \
1832     va_list ap;                             \
1833     fprintf (stderr, "%s: ", program_name); \
1834     va_start (ap, fmt);                     \
1835     vfprintf (stderr, fmt, ap);             \
1836     va_end (ap);                            \
1837     fprintf (stderr, "\n");
1838
1839 static void
1840 vfprintf_diag (const char *fmt, ...)
1841 {
1842     DO_VFPRINTF (fmt);
1843 }
1844
1845 static void
1846 vfprintf_fail (const char *fmt, ...)
1847 {
1848     DO_VFPRINTF (fmt);
1849     exit (EXIT_FAILURE);
1850 }
1851
1852 static void
1853 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1854 {
1855     /* nothing to stack */
1856     if (ptr == NULL)
1857       return;
1858     if (!*list)
1859       *list = xmalloc (sizeof (void *));
1860     else
1861       {
1862         unsigned int i;
1863         for (i = 0; i < *stacked; i++)
1864           if (!(*list)[i])
1865             {
1866               (*list)[i] = ptr;
1867               return; /* reused */
1868             }
1869         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1870       }
1871     (*list)[index] = ptr;
1872     (*stacked)++;
1873 }
1874
1875 static void
1876 release_var (void **list, unsigned int stacked, void **ptr)
1877 {
1878     unsigned int i;
1879     /* nothing to release */
1880     if (*ptr == NULL)
1881       return;
1882     for (i = 0; i < stacked; i++)
1883       if (list[i] == *ptr)
1884         {
1885           free (*ptr);
1886           *ptr = NULL;
1887           list[i] = NULL;
1888           return;
1889         }
1890 }