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) 2011-2018 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 <stdarg.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <sys/time.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <time.h>
  38 #include <unistd.h>
  39
  40 #ifndef DEBUG
  41 # define DEBUG 0
  42 #endif
  43
  44 #define str(arg) #arg
  45 #define to_str(arg) str(arg)
  46
  47 #define streq(s1, s2) (strcmp (s1, s2) == 0)
  48 #define strneq(s1, s2, n) (strncmp (s1, s2, n) == 0)
  49
  50 #if !DEBUG
  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 # define xstrdup(str)           strdup_wrap(str,            NULL, 0)
  55 # define str_concat(str1, str2) str_concat_wrap(str1, str2, NULL, 0)
  56 #else
  57 # define xmalloc(size)          malloc_wrap_debug(size,        __FILE__, __LINE__)
  58 # define xcalloc(nmemb, size)   calloc_wrap_debug(nmemb, size, __FILE__, __LINE__)
  59 # define xrealloc(ptr, size)    realloc_wrap_debug(ptr, size,  __FILE__, __LINE__)
  60 # define xstrdup(str)           strdup_wrap(str,               __FILE__, __LINE__)
  61 # define str_concat(str1, str2) str_concat_wrap(str1, str2,    __FILE__, __LINE__)
  62 #endif
  63
  64 #define free_null(ptr) free_wrap((void **)&ptr)
  65
  66 #if defined(BUF_SIZE) && (BUF_SIZE <= 0 || BUF_SIZE > 65536)
  67 # undef BUF_SIZE
  68 #endif
  69 #ifndef BUF_SIZE
  70 # define BUF_SIZE 4096
  71 #endif
  72
  73 #define LF 0x01
  74 #define CR 0x02
  75
  76 #define COUNT_OF(obj, type) (sizeof (obj) / sizeof (type))
  77
  78 #define SKIP_LINE_ENDINGS(flags) ((flags) == (CR|LF) ? 2 : 1)
  79
  80 #define VALID_FILE_TYPE(mode) (S_ISREG (mode) || S_ISLNK (mode) || S_ISFIFO (mode))
  81
  82 #define STACK_VAR(ptr) do {                                   \
  83     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  84 } while (false)
  85
  86 #define RELEASE_VAR(ptr) do {                             \
  87     release_var (vars_list, stacked_vars, (void **)&ptr); \
  88 } while (false)
  89
  90 #if !DEBUG
  91 # define MEM_ALLOC_FAIL() do {                                         \
  92     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  93     exit (EXIT_FAILURE);                                               \
  94 } while (false)
  95 #else
  96 # define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                              \
  97     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
  98     exit (EXIT_FAILURE);                                                                    \
  99 } while (false)
 100 #endif
 101
 102 #define ABORT_TRACE()                                                              \
 103     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
 104     abort ();
 105
 106 #define CHECK_COLORS_RANDOM(color1, color2)        \
 107      streq (color_names[color1]->name, "random")   \
 108  && (streq (color_names[color2]->name, "none")     \
 109   || streq (color_names[color2]->name, "default"))
 110
 111 #define ALLOC_COMPLETE_PART_LINE 8
 112
 113 #if defined(COLOR_SEP_CHAR_COLON)
 114 # define COLOR_SEP_CHAR ':'
 115 #elif defined(COLOR_SEP_CHAR_SLASH)
 116 # define COLOR_SEP_CHAR '/'
 117 #else
 118 # define COLOR_SEP_CHAR '/'
 119 #endif
 120
 121 #if DEBUG
 122 # define DEBUG_FILE "debug.txt"
 123 #endif
 124
 125 #define MAX_ATTRIBUTE_CHARS (6 * 2)
 126
 127 #define PROGRAM_NAME "colorize"
 128
 129 #define VERSION "0.64"
 130
 131 typedef enum { false, true } bool;
 132
 133 struct color_name {
 134     char *name;
 135     char *orig;
 136 };
 137
 138 struct color {
 139     const char *name;
 140     const char *code;
 141 };
 142
 143 static const struct color fg_colors[] = {
 144     { "none",     NULL },
 145     { "black",   "30m" },
 146     { "red",     "31m" },
 147     { "green",   "32m" },
 148     { "yellow",  "33m" },
 149     { "blue",    "34m" },
 150     { "magenta", "35m" },
 151     { "cyan",    "36m" },
 152     { "white",   "37m" },
 153     { "default", "39m" },
 154 };
 155 static const struct color bg_colors[] = {
 156     { "none",     NULL },
 157     { "black",   "40m" },
 158     { "red",     "41m" },
 159     { "green",   "42m" },
 160     { "yellow",  "43m" },
 161     { "blue",    "44m" },
 162     { "magenta", "45m" },
 163     { "cyan",    "46m" },
 164     { "white",   "47m" },
 165     { "default", "49m" },
 166 };
 167
 168 struct bytes_size {
 169     unsigned int size;
 170     char unit;
 171 };
 172
 173 enum {
 174     FMT_GENERIC,
 175     FMT_STRING,
 176     FMT_QUOTE,
 177     FMT_COLOR,
 178     FMT_RANDOM,
 179     FMT_ERROR,
 180     FMT_FILE,
 181     FMT_TYPE
 182 };
 183 static const char *formats[] = {
 184     "%s",                     /* generic */
 185     "%s '%s'",                /* string  */
 186     "%s `%s' %s",             /* quote   */
 187     "%s color '%s' %s",       /* color   */
 188     "%s color '%s' %s '%s'",  /* random  */
 189     "less than %lu bytes %s", /* error   */
 190     "%s: %s",                 /* file    */
 191     "%s: %s: %s",             /* type    */
 192 };
 193
 194 enum { GENERIC, FOREGROUND = 0, BACKGROUND };
 195
 196 static const struct {
 197     const struct color *entries;
 198     unsigned int count;
 199     const char *desc;
 200 } tables[] = {
 201     { fg_colors, COUNT_OF (fg_colors, struct color), "foreground" },
 202     { bg_colors, COUNT_OF (bg_colors, struct color), "background" },
 203 };
 204
 205 enum {
 206     OPT_ATTR = 1,
 207     OPT_CLEAN,
 208     OPT_CLEAN_ALL,
 209     OPT_EXCLUDE_RANDOM,
 210     OPT_OMIT_COLOR_EMPTY,
 211     OPT_HELP,
 212     OPT_VERSION
 213 };
 214 static int opt_type;
 215 static const struct option long_opts[] = {
 216     { "attr",             required_argument, &opt_type, OPT_ATTR             },
 217     { "clean",            no_argument,       &opt_type, OPT_CLEAN            },
 218     { "clean-all",        no_argument,       &opt_type, OPT_CLEAN_ALL        },
 219     { "exclude-random",   required_argument, &opt_type, OPT_EXCLUDE_RANDOM   },
 220     { "omit-color-empty", no_argument,       &opt_type, OPT_OMIT_COLOR_EMPTY },
 221     { "help",             no_argument,       &opt_type, OPT_HELP             },
 222     { "version",          no_argument,       &opt_type, OPT_VERSION          },
 223     {  NULL,              0,                 NULL,      0                    },
 224 };
 225
 226 enum attr_type {
 227     ATTR_BOLD = 0x01,
 228     ATTR_UNDERSCORE = 0x02,
 229     ATTR_BLINK = 0x04,
 230     ATTR_REVERSE = 0x08,
 231     ATTR_CONCEALED = 0x10
 232 };
 233 struct attr {
 234     const char *name;
 235     unsigned int val;
 236     enum attr_type type;
 237 };
 238
 239 static FILE *stream;
 240 #if DEBUG
 241 static FILE *log;
 242 #endif
 243
 244 static unsigned int stacked_vars;
 245 static void **vars_list;
 246
 247 static bool clean;
 248 static bool clean_all;
 249 static bool omit_color_empty;
 250
 251 static char attr[MAX_ATTRIBUTE_CHARS + 1];
 252 static char *exclude;
 253
 254 static const char *program_name;
 255
 256 static void process_opts (int, char **);
 257 static void process_opt_attr (const char *);
 258 static void write_attr (const struct attr *, unsigned int *);
 259 static void print_hint (void);
 260 static void print_help (void);
 261 static void print_version (void);
 262 static void cleanup (void);
 263 static void free_color_names (struct color_name **);
 264 static void process_args (unsigned int, char **, char *, const struct color **, const char **, FILE **);
 265 static void process_file_arg (const char *, const char **, FILE **);
 266 static void skip_path_colors (const char *, const char *, const struct stat *);
 267 static void gather_color_names (const char *, char *, struct color_name **);
 268 static void read_print_stream (const char *, const struct color **, const char *, FILE *);
 269 static void merge_print_line (const char *, const char *, FILE *);
 270 static void complete_part_line (const char *, char **, FILE *);
 271 static bool get_next_char (char *, const char **, FILE *, bool *);
 272 static void save_char (char, char **, size_t *, size_t *);
 273 static void find_color_entries (struct color_name **, const struct color **);
 274 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 275 static void print_line (const char *, const struct color **, const char * const, unsigned int, bool);
 276 static void print_clean (const char *);
 277 static bool is_esc (const char *);
 278 static const char *get_end_of_esc (const char *);
 279 static const char *get_end_of_text (const char *);
 280 static void print_text (const char *, size_t);
 281 static bool gather_esc_offsets (const char *, const char **, const char **);
 282 static bool validate_esc_clean_all (const char **);
 283 static bool validate_esc_clean (int, unsigned int, unsigned int *, const char **, bool *);
 284 static bool is_reset (int, unsigned int, const char **);
 285 static bool is_attr (int, unsigned int, unsigned int, const char **);
 286 static bool is_fg_color (int, const char **);
 287 static bool is_bg_color (int, unsigned int, const char **);
 288 #if !DEBUG
 289 static void *malloc_wrap (size_t);
 290 static void *calloc_wrap (size_t, size_t);
 291 static void *realloc_wrap (void *, size_t);
 292 #else
 293 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 294 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 295 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 296 #endif
 297 static void free_wrap (void **);
 298 static char *strdup_wrap (const char *, const char *, unsigned int);
 299 static char *str_concat_wrap (const char *, const char *, const char *, unsigned int);
 300 static bool get_bytes_size (unsigned long, struct bytes_size *);
 301 static char *get_file_type (mode_t);
 302 static bool has_color_name (const char *, const char *);
 303 static FILE *open_file (const char *, const char *);
 304 static void vfprintf_diag (const char *, ...);
 305 static void vfprintf_fail (const char *, ...);
 306 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 307 static void release_var (void **, unsigned int, void **);
 308
 309 extern int optind;
 310
 311 int
 312 main (int argc, char **argv)
 313 {
 314     unsigned int arg_cnt;
 315
 316     const struct color *colors[2] = {
 317         NULL, /* foreground */
 318         NULL, /* background */
 319     };
 320
 321     const char *file = NULL;
 322
 323     program_name = argv[0];
 324     atexit (cleanup);
 325
 326     setvbuf (stdout, NULL, _IOLBF, 0);
 327
 328 #if DEBUG
 329     log = open_file (DEBUG_FILE, "w");
 330 #endif
 331
 332     attr[0] = '\0';
 333
 334     process_opts (argc, argv);
 335
 336     arg_cnt = argc - optind;
 337
 338     if (clean || clean_all)
 339       {
 340         if (clean && clean_all)
 341           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 342         if (arg_cnt > 1)
 343           {
 344             const char *const format = "%s %s";
 345             const char *const message = "switch cannot be used with more than one file";
 346             if (clean)
 347               vfprintf_fail (format, "--clean", message);
 348             else if (clean_all)
 349               vfprintf_fail (format, "--clean-all", message);
 350           }
 351       }
 352     else
 353       {
 354         if (arg_cnt == 0 || arg_cnt > 2)
 355           {
 356             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
 357             print_hint ();
 358             exit (EXIT_FAILURE);
 359           }
 360       }
 361
 362     if (clean || clean_all)
 363       process_file_arg (argv[optind], &file, &stream);
 364     else
 365       process_args (arg_cnt, &argv[optind], &attr[0], colors, &file, &stream);
 366     read_print_stream (&attr[0], colors, file, stream);
 367
 368     RELEASE_VAR (exclude);
 369
 370     exit (EXIT_SUCCESS);
 371 }
 372
 373 #define PRINT_HELP_EXIT() \
 374     print_help ();        \
 375     exit (EXIT_SUCCESS);
 376
 377 #define PRINT_VERSION_EXIT() \
 378     print_version ();        \
 379     exit (EXIT_SUCCESS);
 380
 381 extern char *optarg;
 382
 383 static void
 384 process_opts (int argc, char **argv)
 385 {
 386     int opt;
 387     while ((opt = getopt_long (argc, argv, "hV", long_opts, NULL)) != -1)
 388       {
 389         switch (opt)
 390           {
 391             case 0: /* long opts */
 392               switch (opt_type)
 393                 {
 394                   case OPT_ATTR:
 395                     process_opt_attr (optarg);
 396                     break;
 397                   case OPT_CLEAN:
 398                     clean = true;
 399                     break;
 400                   case OPT_CLEAN_ALL:
 401                     clean_all = true;
 402                     break;
 403                   case OPT_EXCLUDE_RANDOM: {
 404                     bool valid = false;
 405                     unsigned int i;
 406                     exclude = xstrdup (optarg);
 407                     STACK_VAR (exclude);
 408                     for (i = 1; i < tables[GENERIC].count - 1; i++) /* skip color none and default */
 409                       {
 410                         const struct color *entry = &tables[GENERIC].entries[i];
 411                         if (streq (exclude, entry->name))
 412                           {
 413                             valid = true;
 414                             break;
 415                           }
 416                       }
 417                     if (!valid)
 418                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain color");
 419                     break;
 420                   }
 421                   case OPT_OMIT_COLOR_EMPTY:
 422                     omit_color_empty = true;
 423                     break;
 424                   case OPT_HELP:
 425                     PRINT_HELP_EXIT ();
 426                   case OPT_VERSION:
 427                     PRINT_VERSION_EXIT ();
 428                   default: /* never reached */
 429                     ABORT_TRACE ();
 430                 }
 431               break;
 432             case 'h':
 433               PRINT_HELP_EXIT ();
 434             case 'V':
 435               PRINT_VERSION_EXIT ();
 436             case '?':
 437               print_hint ();
 438               exit (EXIT_FAILURE);
 439             default: /* never reached */
 440               ABORT_TRACE ();
 441           }
 442       }
 443 }
 444
 445 static void
 446 process_opt_attr (const char *p)
 447 {
 448     /* If attributes are added to this "list", also increase MAX_ATTRIBUTE_CHARS!  */
 449     const struct attr attrs[] = {
 450         { "bold",       1, ATTR_BOLD       },
 451         { "underscore", 4, ATTR_UNDERSCORE },
 452         { "blink",      5, ATTR_BLINK      },
 453         { "reverse",    7, ATTR_REVERSE    },
 454         { "concealed",  8, ATTR_CONCEALED  },
 455     };
 456     unsigned int attr_types = 0;
 457
 458     while (*p)
 459       {
 460         const char *s;
 461         if (!isalnum (*p))
 462           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must be provided a string");
 463         s = p;
 464         while (isalnum (*p))
 465           p++;
 466         if (*p != '\0' && *p != ',')
 467           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must have strings separated by ,");
 468         else
 469           {
 470             bool valid_attr = false;
 471             unsigned int i;
 472             for (i = 0; i < COUNT_OF (attrs, struct attr); i++)
 473               {
 474                 const size_t name_len = strlen (attrs[i].name);
 475                 if ((size_t)(p - s) == name_len && strneq (s, attrs[i].name, name_len))
 476                   {
 477                     write_attr (&attrs[i], &attr_types);
 478                     valid_attr = true;
 479                     break;
 480                   }
 481               }
 482             if (!valid_attr)
 483               {
 484                 char *attr_invalid = xmalloc ((p - s) + 1);
 485                 STACK_VAR (attr_invalid);
 486                 strncpy (attr_invalid, s, p - s);
 487                 attr_invalid[p - s] = '\0';
 488                 vfprintf_fail ("--attr switch attribute '%s' is not valid", attr_invalid);
 489                 RELEASE_VAR (attr_invalid); /* never reached */
 490               }
 491           }
 492         if (*p)
 493           p++;
 494       }
 495 }
 496
 497 static void
 498 write_attr (const struct attr *attr_i, unsigned int *attr_types)
 499 {
 500     const unsigned int val = attr_i->val;
 501     const enum attr_type attr_type = attr_i->type;
 502     const char *attr_name = attr_i->name;
 503
 504     if (*attr_types & attr_type)
 505       vfprintf_fail ("--attr switch has attribute '%s' twice or more", attr_name);
 506     snprintf (attr + strlen (attr), 3, "%u;", val);
 507     *attr_types |= attr_type;
 508 }
 509
 510 static void
 511 print_hint (void)
 512 {
 513     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 514 }
 515
 516 static void
 517 print_help (void)
 518 {
 519     struct opt_data {
 520         const char *name;
 521         const char *short_opt;
 522         const char *arg;
 523     };
 524     const struct opt_data opts_data[] = {
 525         { "attr",           NULL, "=ATTR1,ATTR2,..." },
 526         { "exclude-random", NULL, "=COLOR"           },
 527         { "help",           "h",  NULL               },
 528         { "version",        "V",  NULL               },
 529     };
 530     const struct option *opt = long_opts;
 531     unsigned int i;
 532
 533     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 534     printf ("\tColors (foreground) (background)\n");
 535     for (i = 0; i < tables[FOREGROUND].count; i++)
 536       {
 537         const struct color *entry = &tables[FOREGROUND].entries[i];
 538         const char *name = entry->name;
 539         const char *code = entry->code;
 540         if (code)
 541           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 542                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 543         else
 544           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 545       }
 546     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 547
 548     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 549     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 550
 551     printf ("\n\tOptions\n");
 552     for (; opt->name; opt++)
 553       {
 554         const struct opt_data *opt_data = NULL;
 555         unsigned int i;
 556         for (i = 0; i < COUNT_OF (opts_data, struct opt_data); i++)
 557           if (streq (opt->name, opts_data[i].name))
 558             {
 559               opt_data = &opts_data[i];
 560               break;
 561             }
 562         if (opt_data)
 563           {
 564             if (opt_data->short_opt)
 565               printf ("\t\t-%s, --%s\n", opt_data->short_opt, opt->name);
 566             else
 567               printf ("\t\t    --%s%s\n", opt->name, opt_data->arg);
 568           }
 569         else
 570           printf ("\t\t    --%s\n", opt->name);
 571       }
 572     printf ("\n");
 573 }
 574
 575 static void
 576 print_version (void)
 577 {
 578 #ifdef HAVE_VERSION
 579 # include "version.h"
 580 #else
 581     const char *const version = NULL;
 582 #endif
 583     const char *version_prefix, *version_string;
 584     const char *c_flags, *ld_flags, *cpp_flags;
 585     const char *const desc_flags_unknown = "unknown";
 586     struct bytes_size bytes_size;
 587     bool debug;
 588 #ifdef CFLAGS
 589     c_flags = to_str (CFLAGS);
 590 #else
 591     c_flags = desc_flags_unknown;
 592 #endif
 593 #ifdef LDFLAGS
 594     ld_flags = to_str (LDFLAGS);
 595 #else
 596     ld_flags = desc_flags_unknown;
 597 #endif
 598 #ifdef CPPFLAGS
 599     cpp_flags = to_str (CPPFLAGS);
 600 #else
 601     cpp_flags = desc_flags_unknown;
 602 #endif
 603 #if DEBUG
 604     debug = true;
 605 #else
 606     debug = false;
 607 #endif
 608     version_prefix = version ? "" : "v";
 609     version_string = version ? version : VERSION;
 610     printf ("%s %s%s (compiled at %s, %s)\n", PROGRAM_NAME, version_prefix, version_string, __DATE__, __TIME__);
 611
 612     printf ("Compiler flags: %s\n", c_flags);
 613     printf ("Linker flags: %s\n", ld_flags);
 614     printf ("Preprocessor flags: %s\n", cpp_flags);
 615     if (get_bytes_size (BUF_SIZE, &bytes_size))
 616       {
 617         if (BUF_SIZE % 1024 == 0)
 618           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 619         else
 620           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 621                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 622       }
 623     else
 624       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 625     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 626     printf ("Debugging: %s\n", debug ? "yes" : "no");
 627 }
 628
 629 static void
 630 cleanup (void)
 631 {
 632     if (stream && fileno (stream) != STDIN_FILENO)
 633       fclose (stream);
 634 #if DEBUG
 635     if (log)
 636       fclose (log);
 637 #endif
 638
 639     if (vars_list)
 640       {
 641         unsigned int i;
 642         for (i = 0; i < stacked_vars; i++)
 643           free (vars_list[i]);
 644         free_null (vars_list);
 645       }
 646 }
 647
 648 static void
 649 free_color_names (struct color_name **color_names)
 650 {
 651     unsigned int i;
 652     for (i = 0; color_names[i]; i++)
 653       {
 654         RELEASE_VAR (color_names[i]->name);
 655         RELEASE_VAR (color_names[i]->orig);
 656         RELEASE_VAR (color_names[i]);
 657       }
 658 }
 659
 660 static void
 661 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream)
 662 {
 663     int ret;
 664     char *p;
 665     struct stat sb;
 666     struct color_name *color_names[3] = {
 667         NULL, /* foreground */
 668         NULL, /* background */
 669         NULL, /* sentinel value */
 670     };
 671
 672     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 673     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 674
 675     assert (color_string != NULL);
 676
 677     if (streq (color_string, "-"))
 678       {
 679         if (file_string)
 680           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 681         else
 682           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 683       }
 684
 685     ret = lstat (color_string, &sb);
 686
 687     /* Ensure that we don't fail if there's a file with one or more
 688        color names in its path.  */
 689     if (ret == 0) /* success */
 690       skip_path_colors (color_string, file_string, &sb);
 691
 692     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 693       {
 694         if (p == color_string)
 695           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
 696         else if (p == color_string + strlen (color_string) - 1)
 697           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
 698         else if (strchr (++p, COLOR_SEP_CHAR))
 699           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
 700       }
 701
 702     gather_color_names (color_string, attr, color_names);
 703
 704     assert (color_names[FOREGROUND] != NULL);
 705
 706     if (color_names[BACKGROUND])
 707       {
 708         unsigned int i;
 709         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 710         for (i = 0; i < 2; i++)
 711           {
 712             const unsigned int color1 = color_sets[i][0];
 713             const unsigned int color2 = color_sets[i][1];
 714             if (CHECK_COLORS_RANDOM (color1, color2))
 715               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 716           }
 717       }
 718
 719     find_color_entries (color_names, colors);
 720     assert (colors[FOREGROUND] != NULL);
 721     free_color_names (color_names);
 722
 723     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 724       {
 725         struct color_name color_name;
 726         color_name.name = color_name.orig = "default";
 727
 728         find_color_entry (&color_name, FOREGROUND, colors);
 729         assert (colors[FOREGROUND]->code != NULL);
 730       }
 731
 732     process_file_arg (file_string, file, stream);
 733 }
 734
 735 static void
 736 process_file_arg (const char *file_string, const char **file, FILE **stream)
 737 {
 738     if (file_string)
 739       {
 740         if (streq (file_string, "-"))
 741           *stream = stdin;
 742         else
 743           {
 744             const char *file = file_string;
 745             struct stat sb;
 746             int ret;
 747
 748             errno = 0;
 749             ret = stat (file, &sb);
 750
 751             if (ret == -1)
 752               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 753
 754             if (!VALID_FILE_TYPE (sb.st_mode))
 755               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
 756
 757             *stream = open_file (file, "r");
 758           }
 759         *file = file_string;
 760       }
 761     else
 762       {
 763         *stream = stdin;
 764         *file = "stdin";
 765       }
 766
 767     assert (*stream != NULL);
 768     assert (*file != NULL);
 769 }
 770
 771 static void
 772 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb)
 773 {
 774     bool have_file;
 775     unsigned int c;
 776     const char *color = color_string;
 777     const mode_t mode = sb->st_mode;
 778
 779     for (c = 1; c <= 2 && *color; c++)
 780       {
 781         bool matched = false;
 782         unsigned int i;
 783         for (i = 0; i < tables[GENERIC].count; i++)
 784           {
 785             const struct color *entry = &tables[GENERIC].entries[i];
 786             if (has_color_name (color, entry->name))
 787               {
 788                 color += strlen (entry->name);
 789                 matched = true;
 790                 break;
 791               }
 792           }
 793         if (!matched && has_color_name (color, "random"))
 794           {
 795             color += strlen ("random");
 796             matched = true;
 797           }
 798         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 799           color++;
 800         else
 801           break;
 802       }
 803
 804     have_file = (*color != '\0');
 805
 806     if (have_file)
 807       {
 808         const char *file_existing = color_string;
 809         if (file_string)
 810           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "cannot be used as color string");
 811         else
 812           {
 813             if (VALID_FILE_TYPE (mode))
 814               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "must be preceded by color string");
 815             else
 816               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "is not a valid file type");
 817           }
 818       }
 819 }
 820
 821 static void
 822 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
 823 {
 824     unsigned int index;
 825     char *color, *p, *str;
 826
 827     str = xstrdup (color_string);
 828     STACK_VAR (str);
 829
 830     for (index = 0, color = str; *color; index++, color = p)
 831       {
 832         char *ch, *sep;
 833
 834         p = NULL;
 835         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 836           {
 837             *sep = '\0';
 838             p = sep + 1;
 839           }
 840         else
 841           p = color + strlen (color);
 842         assert (p != NULL);
 843
 844         for (ch = color; *ch; ch++)
 845           if (!isalpha (*ch))
 846             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 847
 848         for (ch = color + 1; *ch; ch++)
 849           if (!islower (*ch))
 850             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 851
 852         if (streq (color, "None"))
 853           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 854
 855         if (isupper (*color))
 856           {
 857             switch (index)
 858               {
 859                 case FOREGROUND:
 860                   snprintf (attr + strlen (attr), 3, "1;");
 861                   break;
 862                 case BACKGROUND:
 863                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 864                 default: /* never reached */
 865                   ABORT_TRACE ();
 866               }
 867           }
 868
 869         color_names[index] = xcalloc (1, sizeof (struct color_name));
 870         STACK_VAR (color_names[index]);
 871
 872         color_names[index]->orig = xstrdup (color);
 873         STACK_VAR (color_names[index]->orig);
 874
 875         for (ch = color; *ch; ch++)
 876           *ch = tolower (*ch);
 877
 878         color_names[index]->name = xstrdup (color);
 879         STACK_VAR (color_names[index]->name);
 880       }
 881
 882     RELEASE_VAR (str);
 883 }
 884
 885 static void
 886 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
 887 {
 888     char buf[BUF_SIZE + 1];
 889     unsigned int flags = 0;
 890
 891     while (!feof (stream))
 892       {
 893         size_t bytes_read;
 894         char *eol;
 895         const char *line;
 896         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 897         if (bytes_read != BUF_SIZE && ferror (stream))
 898           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 899         buf[bytes_read] = '\0';
 900         line = buf;
 901         while ((eol = strpbrk (line, "\n\r")))
 902           {
 903             const bool has_text = (eol > line);
 904             const char *p;
 905             flags &= ~(CR|LF);
 906             if (*eol == '\r')
 907               {
 908                 flags |= CR;
 909                 if (*(eol + 1) == '\n')
 910                   flags |= LF;
 911               }
 912             else if (*eol == '\n')
 913               flags |= LF;
 914             else /* never reached */
 915               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 916             p = eol + SKIP_LINE_ENDINGS (flags);
 917             *eol = '\0';
 918             print_line (attr, colors, line, flags,
 919                         omit_color_empty ? has_text : true);
 920             line = p;
 921           }
 922         if (feof (stream))
 923           {
 924             if (*line != '\0')
 925               print_line (attr, colors, line, 0, true);
 926           }
 927         else if (*line != '\0')
 928           {
 929             char *p;
 930             if ((clean || clean_all) && (p = strrchr (line, '\033')))
 931               merge_print_line (line, p, stream);
 932             else
 933               print_line (attr, colors, line, 0, true);
 934           }
 935       }
 936 }
 937
 938 static void
 939 merge_print_line (const char *line, const char *p, FILE *stream)
 940 {
 941     char *buf = NULL;
 942     char *merged_esc = NULL;
 943     const char *esc = "";
 944     const char char_restore = *p;
 945
 946     complete_part_line (p + 1, &buf, stream);
 947
 948     if (buf)
 949       {
 950         /* form escape sequence */
 951         esc = merged_esc = str_concat (p, buf);
 952         /* shorten partial line accordingly */
 953         *(char *)p = '\0';
 954         free (buf);
 955       }
 956
 957 #ifdef TEST_MERGE_PART_LINE
 958     printf ("%s%s", line, esc);
 959     fflush (stdout);
 960     _exit (EXIT_SUCCESS);
 961 #else
 962     print_clean (line);
 963     *(char *)p = char_restore;
 964     print_clean (esc);
 965     free (merged_esc);
 966 #endif
 967 }
 968
 969 static void
 970 complete_part_line (const char *p, char **buf, FILE *stream)
 971 {
 972     bool got_next_char = false, read_from_stream;
 973     char ch;
 974     size_t i = 0, size;
 975
 976     if (get_next_char (&ch, &p, stream, &read_from_stream))
 977       {
 978         if (ch == '[')
 979           {
 980             if (read_from_stream)
 981               save_char (ch, buf, &i, &size);
 982           }
 983         else
 984           {
 985             if (read_from_stream)
 986               ungetc ((int)ch, stream);
 987             return; /* cancel */
 988           }
 989       }
 990     else
 991       return; /* cancel */
 992
 993     while (get_next_char (&ch, &p, stream, &read_from_stream))
 994       {
 995         if (isdigit (ch) || ch == ';')
 996           {
 997             if (read_from_stream)
 998               save_char (ch, buf, &i, &size);
 999           }
1000         else /* got next character */
1001           {
1002             got_next_char = true;
1003             break;
1004           }
1005       }
1006
1007     if (got_next_char)
1008       {
1009         if (ch == 'm')
1010           {
1011             if (read_from_stream)
1012               save_char (ch, buf, &i, &size);
1013           }
1014         else
1015           {
1016             if (read_from_stream)
1017               ungetc ((int)ch, stream);
1018             return; /* cancel */
1019           }
1020       }
1021     else
1022       return; /* cancel */
1023 }
1024
1025 static bool
1026 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
1027 {
1028     if (**p == '\0')
1029       {
1030         int c;
1031         if ((c = fgetc (stream)) != EOF)
1032           {
1033             *ch = (char)c;
1034             *read_from_stream = true;
1035             return true;
1036           }
1037         else
1038           {
1039             *read_from_stream = false;
1040             return false;
1041           }
1042       }
1043     else
1044       {
1045         *ch = **p;
1046         (*p)++;
1047         *read_from_stream = false;
1048         return true;
1049       }
1050 }
1051
1052 static void
1053 save_char (char ch, char **buf, size_t *i, size_t *size)
1054 {
1055     if (!*buf)
1056       {
1057         *size = ALLOC_COMPLETE_PART_LINE;
1058         *buf = xmalloc (*size);
1059       }
1060     /* +1: effective occupied size of buffer */
1061     else if ((*i + 1) == *size)
1062       {
1063         *size *= 2;
1064         *buf = xrealloc (*buf, *size);
1065       }
1066     (*buf)[*i] = ch;
1067     (*buf)[*i + 1] = '\0';
1068     (*i)++;
1069 }
1070
1071 static void
1072 find_color_entries (struct color_name **color_names, const struct color **colors)
1073 {
1074     struct timeval tv;
1075     unsigned int index;
1076
1077     /* randomness */
1078     gettimeofday (&tv, NULL);
1079     srand (tv.tv_usec * tv.tv_sec);
1080
1081     for (index = 0; color_names[index]; index++)
1082       {
1083         const char *color_name = color_names[index]->name;
1084
1085         const unsigned int count                = tables[index].count;
1086         const struct color *const color_entries = tables[index].entries;
1087
1088         if (streq (color_name, "random"))
1089           {
1090             bool excludable;
1091             unsigned int i;
1092             do {
1093               excludable = false;
1094               i = rand() % (count - 2) + 1; /* omit color none and default */
1095               switch (index)
1096                 {
1097                   case FOREGROUND:
1098                     /* --exclude-random */
1099                     if (exclude && streq (exclude, color_entries[i].name))
1100                       excludable = true;
1101                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1102                       excludable = true;
1103                     break;
1104                   case BACKGROUND:
1105                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1106                       excludable = true;
1107                     break;
1108                   default: /* never reached */
1109                     ABORT_TRACE ();
1110                  }
1111             } while (excludable);
1112             colors[index] = (struct color *)&color_entries[i];
1113           }
1114         else
1115           find_color_entry (color_names[index], index, colors);
1116       }
1117 }
1118
1119 static void
1120 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1121 {
1122     bool found = false;
1123     unsigned int i;
1124
1125     const unsigned int count                = tables[index].count;
1126     const struct color *const color_entries = tables[index].entries;
1127
1128     for (i = 0; i < count; i++)
1129       if (streq (color_name->name, color_entries[i].name))
1130         {
1131           colors[index] = (struct color *)&color_entries[i];
1132           found = true;
1133           break;
1134         }
1135     if (!found)
1136       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1137 }
1138
1139 static void
1140 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags, bool emit_colors)
1141 {
1142     /* --clean[-all] */
1143     if (clean || clean_all)
1144       print_clean (line);
1145     /* skip for --omit-color-empty? */
1146     else if (emit_colors)
1147       {
1148         /* Foreground color code is guaranteed to be set when background color code is present.  */
1149         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1150           printf ("\033[%s", colors[BACKGROUND]->code);
1151         if (colors[FOREGROUND]->code)
1152           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1153         else
1154           printf (formats[FMT_GENERIC], line);
1155       }
1156     if (flags & CR)
1157       putchar ('\r');
1158     if (flags & LF)
1159       putchar ('\n');
1160 }
1161
1162 static void
1163 print_clean (const char *line)
1164 {
1165     const char *p = line;
1166
1167     if (is_esc (p))
1168       p = get_end_of_esc (p);
1169
1170     while (*p != '\0')
1171       {
1172         const char *text_start = p;
1173         const char *text_end = get_end_of_text (p);
1174         print_text (text_start, text_end - text_start);
1175         p = get_end_of_esc (text_end);
1176       }
1177 }
1178
1179 static bool
1180 is_esc (const char *p)
1181 {
1182     return gather_esc_offsets (p, NULL, NULL);
1183 }
1184
1185 static const char *
1186 get_end_of_esc (const char *p)
1187 {
1188     const char *esc;
1189     const char *end = NULL;
1190     while ((esc = strchr (p, '\033')))
1191       {
1192         if (gather_esc_offsets (esc, NULL, &end))
1193           break;
1194         p = esc + 1;
1195       }
1196     return end ? end + 1 : p + strlen (p);
1197 }
1198
1199 static const char *
1200 get_end_of_text (const char *p)
1201 {
1202     const char *esc;
1203     const char *start = NULL;
1204     while ((esc = strchr (p, '\033')))
1205       {
1206         if (gather_esc_offsets (esc, &start, NULL))
1207           break;
1208         p = esc + 1;
1209       }
1210     return start ? start : p + strlen (p);
1211 }
1212
1213 static void
1214 print_text (const char *p, size_t len)
1215 {
1216     size_t bytes_written;
1217     bytes_written = fwrite (p, 1, len, stdout);
1218     if (bytes_written != len)
1219       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1220 }
1221
1222 static bool
1223 gather_esc_offsets (const char *p, const char **start, const char **end)
1224 {
1225     /* ESC[ */
1226     if (*p == 27 && *(p + 1) == '[')
1227       {
1228         bool valid = false;
1229         const char *const begin = p;
1230         p += 2;
1231         if (clean_all)
1232           valid = validate_esc_clean_all (&p);
1233         else if (clean)
1234           {
1235             bool check_values;
1236             unsigned int prev_iter, iter;
1237             const char *digit;
1238             prev_iter = iter = 0;
1239             do {
1240               check_values = false;
1241               iter++;
1242               if (!isdigit (*p))
1243                 break;
1244               digit = p;
1245               while (isdigit (*p))
1246                 p++;
1247               if (p - digit > 2)
1248                 break;
1249               else /* check range */
1250                 {
1251                   char val[3];
1252                   int value;
1253                   unsigned int i;
1254                   const unsigned int digits = p - digit;
1255                   for (i = 0; i < digits; i++)
1256                     val[i] = *digit++;
1257                   val[i] = '\0';
1258                   value = atoi (val);
1259                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1260                 }
1261             } while (check_values);
1262           }
1263         if (valid)
1264           {
1265             if (start)
1266               *start = begin;
1267             if (end)
1268               *end = p;
1269             return true;
1270           }
1271       }
1272     return false;
1273 }
1274
1275 static bool
1276 validate_esc_clean_all (const char **p)
1277 {
1278     while (isdigit (**p) || **p == ';')
1279       (*p)++;
1280     return (**p == 'm');
1281 }
1282
1283 static bool
1284 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1285 {
1286     if (is_reset (value, iter, p))
1287       return true;
1288     else if (is_attr (value, iter, *prev_iter, p))
1289       {
1290         (*p)++;
1291         *check_values = true;
1292         *prev_iter = iter;
1293         return false; /* partial escape sequence, need another valid value */
1294       }
1295     else if (is_fg_color (value, p))
1296       return true;
1297     else if (is_bg_color (value, iter, p))
1298       return true;
1299     else
1300       return false;
1301 }
1302
1303 static bool
1304 is_reset (int value, unsigned int iter, const char **p)
1305 {
1306     return (value == 0 && iter == 1 && **p == 'm');
1307 }
1308
1309 static bool
1310 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1311 {
1312     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1313 }
1314
1315 static bool
1316 is_fg_color (int value, const char **p)
1317 {
1318     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1319 }
1320
1321 static bool
1322 is_bg_color (int value, unsigned int iter, const char **p)
1323 {
1324     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1325 }
1326
1327 #if !DEBUG
1328 static void *
1329 malloc_wrap (size_t size)
1330 {
1331     void *p = malloc (size);
1332     if (!p)
1333       MEM_ALLOC_FAIL ();
1334     return p;
1335 }
1336
1337 static void *
1338 calloc_wrap (size_t nmemb, size_t size)
1339 {
1340     void *p = calloc (nmemb, size);
1341     if (!p)
1342       MEM_ALLOC_FAIL ();
1343     return p;
1344 }
1345
1346 static void *
1347 realloc_wrap (void *ptr, size_t size)
1348 {
1349     void *p = realloc (ptr, size);
1350     if (!p)
1351       MEM_ALLOC_FAIL ();
1352     return p;
1353 }
1354 #else
1355 static void *
1356 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1357 {
1358     void *p = malloc (size);
1359     if (!p)
1360       MEM_ALLOC_FAIL_DEBUG (file, line);
1361     fprintf (log, "%s: malloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1362     return p;
1363 }
1364
1365 static void *
1366 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1367 {
1368     void *p = calloc (nmemb, size);
1369     if (!p)
1370       MEM_ALLOC_FAIL_DEBUG (file, line);
1371     fprintf (log, "%s: calloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)(nmemb * size), file, line);
1372     return p;
1373 }
1374
1375 static void *
1376 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1377 {
1378     void *p = realloc (ptr, size);
1379     if (!p)
1380       MEM_ALLOC_FAIL_DEBUG (file, line);
1381     fprintf (log, "%s: realloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1382     return p;
1383 }
1384 #endif /* !DEBUG */
1385
1386 static void
1387 free_wrap (void **ptr)
1388 {
1389     free (*ptr);
1390     *ptr = NULL;
1391 }
1392
1393 #if !DEBUG
1394 # define do_malloc(len, file, line) malloc_wrap(len)
1395 #else
1396 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1397 #endif
1398
1399 static char *
1400 strdup_wrap (const char *str, const char *file, unsigned int line)
1401 {
1402     const size_t len = strlen (str) + 1;
1403     char *p = do_malloc (len, file, line);
1404     strncpy (p, str, len);
1405     return p;
1406 }
1407
1408 static char *
1409 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1410 {
1411     const size_t len = strlen (str1) + strlen (str2) + 1;
1412     char *p, *str;
1413
1414     p = str = do_malloc (len, file, line);
1415     strncpy (p, str1, strlen (str1));
1416     p += strlen (str1);
1417     strncpy (p, str2, strlen (str2));
1418     p += strlen (str2);
1419     *p = '\0';
1420
1421     return str;
1422 }
1423
1424 static bool
1425 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1426 {
1427     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1428     unsigned long size = bytes;
1429     if (bytes < 1024)
1430       return false;
1431     unit = units;
1432     while (size >= 1024 && *(unit + 1))
1433       {
1434         size /= 1024;
1435         unit++;
1436       }
1437     bytes_size->size = (unsigned int)size;
1438     bytes_size->unit = *unit;
1439     return true;
1440 }
1441
1442 static char *
1443 get_file_type (mode_t mode)
1444 {
1445     if (S_ISREG (mode))
1446       return "file";
1447     else if (S_ISDIR (mode))
1448       return "directory";
1449     else if (S_ISCHR (mode))
1450       return "character device";
1451     else if (S_ISBLK (mode))
1452       return "block device";
1453     else if (S_ISFIFO (mode))
1454       return "named pipe";
1455     else if (S_ISLNK (mode))
1456       return "symbolic link";
1457     else if (S_ISSOCK (mode))
1458       return "socket";
1459     else
1460       return "file";
1461 }
1462
1463 static bool
1464 has_color_name (const char *str, const char *name)
1465 {
1466     char *p;
1467
1468     assert (strlen (str) > 0);
1469     assert (strlen (name) > 0);
1470
1471     if (!(*str == *name || *str == toupper (*name)))
1472       return false;
1473     else if (*(name + 1) != '\0'
1474      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1475       return false;
1476     else
1477       return true;
1478 }
1479
1480 static FILE *
1481 open_file (const char *file, const char *mode)
1482 {
1483     FILE *stream;
1484
1485     errno = 0;
1486     stream = fopen (file, mode);
1487     if (!stream)
1488       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1489
1490     return stream;
1491 }
1492
1493 #define DO_VFPRINTF(fmt)                    \
1494     va_list ap;                             \
1495     fprintf (stderr, "%s: ", program_name); \
1496     va_start (ap, fmt);                     \
1497     vfprintf (stderr, fmt, ap);             \
1498     va_end (ap);                            \
1499     fprintf (stderr, "\n");
1500
1501 static void
1502 vfprintf_diag (const char *fmt, ...)
1503 {
1504     DO_VFPRINTF (fmt);
1505 }
1506
1507 static void
1508 vfprintf_fail (const char *fmt, ...)
1509 {
1510     DO_VFPRINTF (fmt);
1511     exit (EXIT_FAILURE);
1512 }
1513
1514 static void
1515 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1516 {
1517     /* nothing to stack */
1518     if (ptr == NULL)
1519       return;
1520     if (!*list)
1521       *list = xmalloc (sizeof (void *));
1522     else
1523       {
1524         unsigned int i;
1525         for (i = 0; i < *stacked; i++)
1526           if (!(*list)[i])
1527             {
1528               (*list)[i] = ptr;
1529               return; /* reused */
1530             }
1531         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1532       }
1533     (*list)[index] = ptr;
1534     (*stacked)++;
1535 }
1536
1537 static void
1538 release_var (void **list, unsigned int stacked, void **ptr)
1539 {
1540     unsigned int i;
1541     /* nothing to release */
1542     if (*ptr == NULL)
1543       return;
1544     for (i = 0; i < stacked; i++)
1545       if (list[i] == *ptr)
1546         {
1547           free (*ptr);
1548           *ptr = NULL;
1549           list[i] = NULL;
1550           return;
1551         }
1552 }