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) 2011-2017 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 SKIP_LINE_ENDINGS(flags) (((flags) & CR) && ((flags) & LF) ? 2 : 1)
  77
  78 #define VALID_FILE_TYPE(mode) (S_ISREG (mode) || S_ISLNK (mode) || S_ISFIFO (mode))
  79
  80 #define STACK_VAR(ptr) do {                                   \
  81     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  82 } while (false)
  83
  84 #define RELEASE_VAR(ptr) do {                             \
  85     release_var (vars_list, stacked_vars, (void **)&ptr); \
  86 } while (false)
  87
  88 #if !DEBUG
  89 # define MEM_ALLOC_FAIL() do {                                         \
  90     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  91     exit (EXIT_FAILURE);                                               \
  92 } while (false)
  93 #else
  94 # define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                              \
  95     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
  96     exit (EXIT_FAILURE);                                                                    \
  97 } while (false)
  98 #endif
  99
 100 #define ABORT_TRACE()                                                              \
 101     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
 102     abort ();                                                                      \
 103
 104 #define CHECK_COLORS_RANDOM(color1, color2)        \
 105      streq (color_names[color1]->name, "random")   \
 106  && (streq (color_names[color2]->name, "none")     \
 107   || streq (color_names[color2]->name, "default")) \
 108
 109 #define ALLOC_COMPLETE_PART_LINE 8
 110
 111 #if defined(COLOR_SEP_CHAR_COLON)
 112 # define COLOR_SEP_CHAR ':'
 113 #elif defined(COLOR_SEP_CHAR_SLASH)
 114 # define COLOR_SEP_CHAR '/'
 115 #else
 116 # define COLOR_SEP_CHAR '/'
 117 #endif
 118
 119 #define DEBUG_FILE "debug.txt"
 120
 121 #define MAX_ATTRIBUTE_CHARS (5 * 2)
 122
 123 #define VERSION "0.62"
 124
 125 typedef enum { false, true } bool;
 126
 127 struct color_name {
 128     char *name;
 129     char *orig;
 130 };
 131
 132 struct color {
 133     const char *name;
 134     const char *code;
 135 };
 136
 137 static const struct color fg_colors[] = {
 138     { "none",     NULL },
 139     { "black",   "30m" },
 140     { "red",     "31m" },
 141     { "green",   "32m" },
 142     { "yellow",  "33m" },
 143     { "blue",    "34m" },
 144     { "magenta", "35m" },
 145     { "cyan",    "36m" },
 146     { "white",   "37m" },
 147     { "default", "39m" },
 148 };
 149 static const struct color bg_colors[] = {
 150     { "none",     NULL },
 151     { "black",   "40m" },
 152     { "red",     "41m" },
 153     { "green",   "42m" },
 154     { "yellow",  "43m" },
 155     { "blue",    "44m" },
 156     { "magenta", "45m" },
 157     { "cyan",    "46m" },
 158     { "white",   "47m" },
 159     { "default", "49m" },
 160 };
 161
 162 struct bytes_size {
 163     unsigned int size;
 164     char unit;
 165 };
 166
 167 enum fmts {
 168     FMT_GENERIC,
 169     FMT_STRING,
 170     FMT_QUOTE,
 171     FMT_COLOR,
 172     FMT_RANDOM,
 173     FMT_ERROR,
 174     FMT_FILE,
 175     FMT_TYPE
 176 };
 177 static const char *formats[] = {
 178     "%s",                     /* generic */
 179     "%s '%s'",                /* string  */
 180     "%s `%s' %s",             /* quote   */
 181     "%s color '%s' %s",       /* color   */
 182     "%s color '%s' %s '%s'",  /* random  */
 183     "less than %lu bytes %s", /* error   */
 184     "%s: %s",                 /* file    */
 185     "%s: %s: %s",             /* type    */
 186 };
 187
 188 enum { GENERIC, FOREGROUND = 0, BACKGROUND };
 189
 190 static const struct {
 191     struct color const *entries;
 192     unsigned int count;
 193     const char *desc;
 194 } tables[] = {
 195     { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
 196     { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
 197 };
 198
 199 enum {
 200     OPT_ATTR = 1,
 201     OPT_CLEAN,
 202     OPT_CLEAN_ALL,
 203     OPT_EXCLUDE_RANDOM,
 204     OPT_HELP,
 205     OPT_VERSION
 206 };
 207 static int opt_type;
 208 static const struct option long_opts[] = {
 209     { "attr",           required_argument, &opt_type, OPT_ATTR           },
 210     { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 211     { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
 212     { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 213     { "help",           no_argument,       &opt_type, OPT_HELP           },
 214     { "version",        no_argument,       &opt_type, OPT_VERSION        },
 215     {  NULL,            0,                 NULL,      0                  },
 216 };
 217
 218 enum attr_type {
 219     ATTR_BOLD = 0x01,
 220     ATTR_UNDERSCORE = 0x02,
 221     ATTR_BLINK = 0x04,
 222     ATTR_REVERSE = 0x08,
 223     ATTR_CONCEALED = 0x10
 224 };
 225 struct attr {
 226     const char *name;
 227     unsigned int val;
 228     enum attr_type type;
 229 };
 230
 231 static FILE *stream;
 232 #if DEBUG
 233 static FILE *log;
 234 #endif
 235
 236 static unsigned int stacked_vars;
 237 static void **vars_list;
 238
 239 static bool clean;
 240 static bool clean_all;
 241
 242 static char attr[MAX_ATTRIBUTE_CHARS + 1];
 243 static char *exclude;
 244
 245 static const char *program_name;
 246
 247 static void process_opts (int, char **);
 248 static void process_opt_attr (const char *);
 249 static void write_attr (const struct attr *, unsigned int *);
 250 static void print_hint (void);
 251 static void print_help (void);
 252 static void print_version (void);
 253 static void cleanup (void);
 254 static void free_color_names (struct color_name **);
 255 static void process_args (unsigned int, char **, char *, const struct color **, const char **, FILE **);
 256 static void process_file_arg (const char *, const char **, FILE **);
 257 static void skip_path_colors (const char *, const char *, const struct stat *);
 258 static void gather_color_names (const char *, char *, struct color_name **);
 259 static void read_print_stream (const char *, const struct color **, const char *, FILE *);
 260 static void merge_print_line (const char *, const char *, FILE *);
 261 static void complete_part_line (const char *, char **, FILE *);
 262 static bool get_next_char (char *, const char **, FILE *, bool *);
 263 static void save_char (char, char **, size_t *, size_t *);
 264 static void find_color_entries (struct color_name **, const struct color **);
 265 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 266 static void print_line (const char *, const struct color **, const char * const, unsigned int);
 267 static void print_clean (const char *);
 268 static bool is_esc (const char *);
 269 static const char *get_end_of_esc (const char *);
 270 static const char *get_end_of_text (const char *);
 271 static void print_text (const char *, size_t);
 272 static bool gather_esc_offsets (const char *, const char **, const char **);
 273 static bool validate_esc_clean_all (const char **);
 274 static bool validate_esc_clean (int, unsigned int, unsigned int *, const char **, bool *);
 275 static bool is_reset (int, unsigned int, const char **);
 276 static bool is_attr (int, unsigned int, unsigned int, const char **);
 277 static bool is_fg_color (int, const char **);
 278 static bool is_bg_color (int, unsigned int, const char **);
 279 #if !DEBUG
 280 static void *malloc_wrap (size_t);
 281 static void *calloc_wrap (size_t, size_t);
 282 static void *realloc_wrap (void *, size_t);
 283 #else
 284 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 285 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 286 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 287 #endif
 288 static void free_wrap (void **);
 289 static char *strdup_wrap (const char *, const char *, unsigned int);
 290 static char *str_concat_wrap (const char *, const char *, const char *, unsigned int);
 291 static bool get_bytes_size (unsigned long, struct bytes_size *);
 292 static char *get_file_type (mode_t);
 293 static bool has_color_name (const char *, const char *);
 294 static FILE *open_file (const char *, const char *);
 295 static void vfprintf_diag (const char *, ...);
 296 static void vfprintf_fail (const char *, ...);
 297 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 298 static void release_var (void **, unsigned int, void **);
 299
 300 extern int optind;
 301
 302 int
 303 main (int argc, char **argv)
 304 {
 305     unsigned int arg_cnt;
 306
 307     const struct color *colors[2] = {
 308         NULL, /* foreground */
 309         NULL, /* background */
 310     };
 311
 312     const char *file = NULL;
 313
 314     program_name = argv[0];
 315     atexit (cleanup);
 316
 317     setvbuf (stdout, NULL, _IOLBF, 0);
 318
 319 #if DEBUG
 320     log = open_file (DEBUG_FILE, "w");
 321 #endif
 322
 323     attr[0] = '\0';
 324
 325     process_opts (argc, argv);
 326
 327     arg_cnt = argc - optind;
 328
 329     if (clean || clean_all)
 330       {
 331         if (clean && clean_all)
 332           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 333         if (arg_cnt > 1)
 334           {
 335             const char *format = "%s %s";
 336             const char *message = "switch cannot be used with more than one file";
 337             if (clean)
 338               vfprintf_fail (format, "--clean", message);
 339             else if (clean_all)
 340               vfprintf_fail (format, "--clean-all", message);
 341           }
 342       }
 343     else
 344       {
 345         if (arg_cnt == 0 || arg_cnt > 2)
 346           {
 347             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
 348             print_hint ();
 349             exit (EXIT_FAILURE);
 350           }
 351       }
 352
 353     if (clean || clean_all)
 354       process_file_arg (argv[optind], &file, &stream);
 355     else
 356       process_args (arg_cnt, &argv[optind], &attr[0], colors, &file, &stream);
 357     read_print_stream (&attr[0], colors, file, stream);
 358
 359     RELEASE_VAR (exclude);
 360
 361     exit (EXIT_SUCCESS);
 362 }
 363
 364 #define PRINT_HELP_EXIT() \
 365     print_help ();        \
 366     exit (EXIT_SUCCESS);  \
 367
 368 #define PRINT_VERSION_EXIT() \
 369     print_version ();        \
 370     exit (EXIT_SUCCESS);     \
 371
 372 extern char *optarg;
 373
 374 static void
 375 process_opts (int argc, char **argv)
 376 {
 377     int opt;
 378     while ((opt = getopt_long (argc, argv, "hV", long_opts, NULL)) != -1)
 379       {
 380         switch (opt)
 381           {
 382             case 0: /* long opts */
 383               switch (opt_type)
 384                 {
 385                   case OPT_ATTR:
 386                     process_opt_attr (optarg);
 387                     break;
 388                   case OPT_CLEAN:
 389                     clean = true;
 390                     break;
 391                   case OPT_CLEAN_ALL:
 392                     clean_all = true;
 393                     break;
 394                   case OPT_EXCLUDE_RANDOM: {
 395                     bool valid = false;
 396                     unsigned int i;
 397                     exclude = xstrdup (optarg);
 398                     STACK_VAR (exclude);
 399                     for (i = 1; i < tables[GENERIC].count - 1; i++) /* skip color none and default */
 400                       {
 401                         const struct color *entry = &tables[GENERIC].entries[i];
 402                         if (streq (exclude, entry->name))
 403                           {
 404                             valid = true;
 405                             break;
 406                           }
 407                       }
 408                     if (!valid)
 409                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain color");
 410                     break;
 411                   }
 412                   case OPT_HELP:
 413                     PRINT_HELP_EXIT ();
 414                   case OPT_VERSION:
 415                     PRINT_VERSION_EXIT ();
 416                   default: /* never reached */
 417                     ABORT_TRACE ();
 418                 }
 419               break;
 420             case 'h':
 421               PRINT_HELP_EXIT ();
 422             case 'V':
 423               PRINT_VERSION_EXIT ();
 424             case '?':
 425               print_hint ();
 426               exit (EXIT_FAILURE);
 427             default: /* never reached */
 428               ABORT_TRACE ();
 429           }
 430       }
 431 }
 432
 433 static void
 434 process_opt_attr (const char *p)
 435 {
 436     /* If attributes are added to this "list", also increase MAX_ATTRIBUTE_CHARS!  */
 437     const struct attr attrs[] = {
 438         { "bold",       1, ATTR_BOLD       },
 439         { "underscore", 4, ATTR_UNDERSCORE },
 440         { "blink",      5, ATTR_BLINK      },
 441         { "reverse",    7, ATTR_REVERSE    },
 442         { "concealed",  8, ATTR_CONCEALED  },
 443     };
 444     unsigned int attr_types = 0;
 445
 446     while (*p)
 447       {
 448         const char *s;
 449         if (!isalnum (*p))
 450           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must be provided a string");
 451         s = p;
 452         while (isalnum (*p))
 453           p++;
 454         if (*p != '\0' && *p != ',')
 455           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must have strings separated by ,");
 456         else
 457           {
 458             bool valid_attr = false;
 459             unsigned int i;
 460             for (i = 0; i < sizeof (attrs) / sizeof (struct attr); i++)
 461               {
 462                 const size_t name_len = strlen (attrs[i].name);
 463                 if ((size_t)(p - s) == name_len && strneq (s, attrs[i].name, name_len))
 464                   {
 465                     write_attr (&attrs[i], &attr_types);
 466                     valid_attr = true;
 467                     break;
 468                   }
 469               }
 470             if (!valid_attr)
 471               {
 472                 char *attr_invalid = xmalloc ((p - s) + 1);
 473                 STACK_VAR (attr_invalid);
 474                 strncpy (attr_invalid, s, p - s);
 475                 attr_invalid[p - s] = '\0';
 476                 vfprintf_fail ("--attr switch attribute '%s' is not valid", attr_invalid);
 477                 RELEASE_VAR (attr_invalid); /* never reached */
 478               }
 479           }
 480         if (*p)
 481           p++;
 482       }
 483 }
 484
 485 static void
 486 write_attr (const struct attr *attr_i, unsigned int *attr_types)
 487 {
 488     const unsigned int val = attr_i->val;
 489     const enum attr_type attr_type = attr_i->type;
 490     const char *attr_name = attr_i->name;
 491
 492     if (*attr_types & attr_type)
 493       vfprintf_fail ("--attr switch has attribute '%s' twice or more", attr_name);
 494     snprintf (attr + strlen (attr), 3, "%u;", val);
 495     *attr_types |= attr_type;
 496 }
 497
 498 static void
 499 print_hint (void)
 500 {
 501     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 502 }
 503
 504 static void
 505 print_help (void)
 506 {
 507     struct short_opt {
 508         const char *name;
 509         const char *short_opt;
 510     };
 511     const struct short_opt short_opts[] = {
 512         { "help",    "h" },
 513         { "version", "V" },
 514     };
 515     const struct option *opt = long_opts;
 516     unsigned int i;
 517
 518     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 519     printf ("\tColors (foreground) (background)\n");
 520     for (i = 0; i < tables[FOREGROUND].count; i++)
 521       {
 522         const struct color *entry = &tables[FOREGROUND].entries[i];
 523         const char *name = entry->name;
 524         const char *code = entry->code;
 525         if (code)
 526           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 527                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 528         else
 529           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 530       }
 531     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 532
 533     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 534     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 535
 536     printf ("\n\tOptions\n");
 537     for (; opt->name; opt++)
 538       {
 539         const char *short_opt = NULL;
 540         unsigned int i;
 541         for (i = 0; i < sizeof (short_opts) / sizeof (struct short_opt); i++)
 542           if (streq (opt->name, short_opts[i].name))
 543             {
 544               short_opt = short_opts[i].short_opt;
 545               break;
 546             }
 547         if (short_opt)
 548           printf ("\t\t-%s, --%s\n", short_opt, opt->name);
 549         else
 550           printf ("\t\t    --%s\n", opt->name);
 551       }
 552     printf ("\n");
 553 }
 554
 555 static void
 556 print_version (void)
 557 {
 558 #ifdef HAVE_VERSION
 559 # include "version.h"
 560 #else
 561     const char *version = NULL;
 562 #endif
 563     const char *version_prefix, *version_string;
 564     const char *c_flags, *ld_flags, *cpp_flags;
 565     const char *const desc_flags_unknown = "unknown";
 566     struct bytes_size bytes_size;
 567     bool debug;
 568 #ifdef CFLAGS
 569     c_flags = to_str (CFLAGS);
 570 #else
 571     c_flags = desc_flags_unknown;
 572 #endif
 573 #ifdef LDFLAGS
 574     ld_flags = to_str (LDFLAGS);
 575 #else
 576     ld_flags = desc_flags_unknown;
 577 #endif
 578 #ifdef CPPFLAGS
 579     cpp_flags = to_str (CPPFLAGS);
 580 #else
 581     cpp_flags = desc_flags_unknown;
 582 #endif
 583 #if DEBUG
 584     debug = true;
 585 #else
 586     debug = false;
 587 #endif
 588     version_prefix = version ? "" : "v";
 589     version_string = version ? version : VERSION;
 590     printf ("colorize %s%s (compiled at %s, %s)\n", version_prefix, version_string, __DATE__, __TIME__);
 591
 592     printf ("Compiler flags: %s\n", c_flags);
 593     printf ("Linker flags: %s\n", ld_flags);
 594     printf ("Preprocessor flags: %s\n", cpp_flags);
 595     if (get_bytes_size (BUF_SIZE, &bytes_size))
 596       {
 597         if (BUF_SIZE % 1024 == 0)
 598           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 599         else
 600           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 601                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 602       }
 603     else
 604       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 605     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 606     printf ("Debugging: %s\n", debug ? "yes" : "no");
 607 }
 608
 609 static void
 610 cleanup (void)
 611 {
 612     if (stream && fileno (stream) != STDIN_FILENO)
 613       fclose (stream);
 614 #if DEBUG
 615     if (log)
 616       fclose (log);
 617 #endif
 618
 619     if (vars_list)
 620       {
 621         unsigned int i;
 622         for (i = 0; i < stacked_vars; i++)
 623           free (vars_list[i]);
 624         free_null (vars_list);
 625       }
 626 }
 627
 628 static void
 629 free_color_names (struct color_name **color_names)
 630 {
 631     unsigned int i;
 632     for (i = 0; color_names[i]; i++)
 633       {
 634         RELEASE_VAR (color_names[i]->name);
 635         RELEASE_VAR (color_names[i]->orig);
 636         RELEASE_VAR (color_names[i]);
 637       }
 638 }
 639
 640 static void
 641 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream)
 642 {
 643     int ret;
 644     char *p;
 645     struct stat sb;
 646     struct color_name *color_names[3] = { NULL, NULL, NULL };
 647
 648     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 649     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 650
 651     assert (color_string != NULL);
 652
 653     if (streq (color_string, "-"))
 654       {
 655         if (file_string)
 656           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 657         else
 658           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 659       }
 660
 661     ret = lstat (color_string, &sb);
 662
 663     /* Ensure that we don't fail if there's a file with one or more
 664        color names in its path.  */
 665     if (ret == 0) /* success */
 666       skip_path_colors (color_string, file_string, &sb);
 667
 668     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 669       {
 670         if (p == color_string)
 671           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
 672         else if (p == color_string + strlen (color_string) - 1)
 673           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
 674         else if (strchr (++p, COLOR_SEP_CHAR))
 675           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
 676       }
 677
 678     gather_color_names (color_string, attr, color_names);
 679
 680     assert (color_names[FOREGROUND] != NULL);
 681
 682     if (color_names[BACKGROUND])
 683       {
 684         unsigned int i;
 685         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 686         for (i = 0; i < 2; i++)
 687           {
 688             const unsigned int color1 = color_sets[i][0];
 689             const unsigned int color2 = color_sets[i][1];
 690             if (CHECK_COLORS_RANDOM (color1, color2))
 691               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 692           }
 693       }
 694
 695     find_color_entries (color_names, colors);
 696     assert (colors[FOREGROUND] != NULL);
 697     free_color_names (color_names);
 698
 699     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 700       {
 701         struct color_name color_name;
 702         color_name.name = color_name.orig = "default";
 703
 704         find_color_entry (&color_name, FOREGROUND, colors);
 705       }
 706
 707     process_file_arg (file_string, file, stream);
 708 }
 709
 710 static void
 711 process_file_arg (const char *file_string, const char **file, FILE **stream)
 712 {
 713     if (file_string)
 714       {
 715         if (streq (file_string, "-"))
 716           *stream = stdin;
 717         else
 718           {
 719             const char *file = file_string;
 720             struct stat sb;
 721             int ret;
 722
 723             errno = 0;
 724             ret = stat (file, &sb);
 725
 726             if (ret == -1)
 727               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 728
 729             if (!VALID_FILE_TYPE (sb.st_mode))
 730               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
 731
 732             *stream = open_file (file, "r");
 733           }
 734         *file = file_string;
 735       }
 736     else
 737       {
 738         *stream = stdin;
 739         *file = "stdin";
 740       }
 741
 742     assert (*stream != NULL);
 743     assert (*file != NULL);
 744 }
 745
 746 static void
 747 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb)
 748 {
 749     bool have_file;
 750     unsigned int c;
 751     const char *color = color_string;
 752     const mode_t mode = sb->st_mode;
 753
 754     for (c = 1; c <= 2 && *color; c++)
 755       {
 756         bool matched = false;
 757         unsigned int i;
 758         for (i = 0; i < tables[GENERIC].count; i++)
 759           {
 760             const struct color *entry = &tables[GENERIC].entries[i];
 761             if (has_color_name (color, entry->name))
 762               {
 763                 color += strlen (entry->name);
 764                 matched = true;
 765                 break;
 766               }
 767           }
 768         if (!matched && has_color_name (color, "random"))
 769           {
 770             color += strlen ("random");
 771             matched = true;
 772           }
 773         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 774           color++;
 775         else
 776           break;
 777       }
 778
 779     have_file = (*color != '\0');
 780
 781     if (have_file)
 782       {
 783         const char *file_existing = color_string;
 784         if (file_string)
 785           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "cannot be used as color string");
 786         else
 787           {
 788             if (VALID_FILE_TYPE (mode))
 789               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "must be preceded by color string");
 790             else
 791               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "is not a valid file type");
 792           }
 793       }
 794 }
 795
 796 static void
 797 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
 798 {
 799     unsigned int index;
 800     char *color, *p, *str;
 801
 802     str = xstrdup (color_string);
 803     STACK_VAR (str);
 804
 805     for (index = 0, color = str; *color; index++, color = p)
 806       {
 807         char *ch, *sep;
 808
 809         p = NULL;
 810         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 811           {
 812             *sep = '\0';
 813             p = sep + 1;
 814           }
 815         else
 816           p = color + strlen (color);
 817         assert (p != NULL);
 818
 819         for (ch = color; *ch; ch++)
 820           if (!isalpha (*ch))
 821             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 822
 823         for (ch = color + 1; *ch; ch++)
 824           if (!islower (*ch))
 825             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 826
 827         if (streq (color, "None"))
 828           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 829
 830         if (isupper (*color))
 831           {
 832             switch (index)
 833               {
 834                 case FOREGROUND:
 835                   snprintf (attr + strlen (attr), 3, "1;");
 836                   break;
 837                 case BACKGROUND:
 838                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 839                 default: /* never reached */
 840                   ABORT_TRACE ();
 841               }
 842           }
 843
 844         color_names[index] = xcalloc (1, sizeof (struct color_name));
 845         STACK_VAR (color_names[index]);
 846
 847         color_names[index]->orig = xstrdup (color);
 848         STACK_VAR (color_names[index]->orig);
 849
 850         for (ch = color; *ch; ch++)
 851           *ch = tolower (*ch);
 852
 853         color_names[index]->name = xstrdup (color);
 854         STACK_VAR (color_names[index]->name);
 855       }
 856
 857     RELEASE_VAR (str);
 858 }
 859
 860 static void
 861 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
 862 {
 863     char buf[BUF_SIZE + 1];
 864     unsigned int flags = 0;
 865
 866     while (!feof (stream))
 867       {
 868         size_t bytes_read;
 869         char *eol;
 870         const char *line;
 871         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 872         if (bytes_read != BUF_SIZE && ferror (stream))
 873           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 874         buf[bytes_read] = '\0';
 875         line = buf;
 876         while ((eol = strpbrk (line, "\n\r")))
 877           {
 878             const char *p;
 879             flags &= ~(CR|LF);
 880             if (*eol == '\r')
 881               {
 882                 flags |= CR;
 883                 if (*(eol + 1) == '\n')
 884                   flags |= LF;
 885               }
 886             else if (*eol == '\n')
 887               flags |= LF;
 888             else
 889               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 890             p = eol + SKIP_LINE_ENDINGS (flags);
 891             *eol = '\0';
 892             print_line (attr, colors, line, flags);
 893             line = p;
 894           }
 895         if (feof (stream))
 896           {
 897             if (*line != '\0')
 898               print_line (attr, colors, line, 0);
 899           }
 900         else if (*line != '\0')
 901           {
 902             char *p;
 903             if ((clean || clean_all) && (p = strrchr (line, '\033')))
 904               merge_print_line (line, p, stream);
 905             else
 906               print_line (attr, colors, line, 0);
 907           }
 908       }
 909 }
 910
 911 static void
 912 merge_print_line (const char *line, const char *p, FILE *stream)
 913 {
 914     char *buf = NULL;
 915     char *merged_esc = NULL;
 916     const char *esc = "";
 917     const char char_restore = *p;
 918
 919     complete_part_line (p + 1, &buf, stream);
 920
 921     if (buf)
 922       {
 923         /* form escape sequence */
 924         esc = merged_esc = str_concat (p, buf);
 925         /* shorten partial line accordingly */
 926         *(char *)p = '\0';
 927         free (buf);
 928       }
 929
 930 #ifdef TEST_MERGE_PART_LINE
 931     printf ("%s%s", line, esc);
 932     fflush (stdout);
 933     _exit (EXIT_SUCCESS);
 934 #else
 935     print_clean (line);
 936     *(char *)p = char_restore;
 937     print_clean (esc);
 938     free (merged_esc);
 939 #endif
 940 }
 941
 942 static void
 943 complete_part_line (const char *p, char **buf, FILE *stream)
 944 {
 945     bool got_next_char = false, read_from_stream;
 946     char ch;
 947     size_t i = 0, size;
 948
 949     if (get_next_char (&ch, &p, stream, &read_from_stream))
 950       {
 951         if (ch == '[')
 952           {
 953             if (read_from_stream)
 954               save_char (ch, buf, &i, &size);
 955           }
 956         else
 957           {
 958             if (read_from_stream)
 959               ungetc ((int)ch, stream);
 960             return; /* cancel */
 961           }
 962       }
 963     else
 964       return; /* cancel */
 965
 966     while (get_next_char (&ch, &p, stream, &read_from_stream))
 967       {
 968         if (isdigit (ch) || ch == ';')
 969           {
 970             if (read_from_stream)
 971               save_char (ch, buf, &i, &size);
 972           }
 973         else /* got next character */
 974           {
 975             got_next_char = true;
 976             break;
 977           }
 978       }
 979
 980     if (got_next_char)
 981       {
 982         if (ch == 'm')
 983           {
 984             if (read_from_stream)
 985               save_char (ch, buf, &i, &size);
 986           }
 987         else
 988           {
 989             if (read_from_stream)
 990               ungetc ((int)ch, stream);
 991             return; /* cancel */
 992           }
 993       }
 994     else
 995       return; /* cancel */
 996 }
 997
 998 static bool
 999 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
1000 {
1001     if (**p == '\0')
1002       {
1003         int c;
1004         if ((c = fgetc (stream)) != EOF)
1005           {
1006             *ch = (char)c;
1007             *read_from_stream = true;
1008             return true;
1009           }
1010         else
1011           {
1012             *read_from_stream = false;
1013             return false;
1014           }
1015       }
1016     else
1017       {
1018         *ch = **p;
1019         (*p)++;
1020         *read_from_stream = false;
1021         return true;
1022       }
1023 }
1024
1025 static void
1026 save_char (char ch, char **buf, size_t *i, size_t *size)
1027 {
1028     if (!*buf)
1029       {
1030         *size = ALLOC_COMPLETE_PART_LINE;
1031         *buf = xmalloc (*size);
1032       }
1033     /* +1: effective occupied size of buffer */
1034     else if ((*i + 1) == *size)
1035       {
1036         *size *= 2;
1037         *buf = xrealloc (*buf, *size);
1038       }
1039     (*buf)[*i] = ch;
1040     (*buf)[*i + 1] = '\0';
1041     (*i)++;
1042 }
1043
1044 static void
1045 find_color_entries (struct color_name **color_names, const struct color **colors)
1046 {
1047     struct timeval tv;
1048     unsigned int index;
1049
1050     /* randomness */
1051     gettimeofday (&tv, NULL);
1052     srand (tv.tv_usec * tv.tv_sec);
1053
1054     for (index = 0; color_names[index]; index++)
1055       {
1056         const char *color_name = color_names[index]->name;
1057
1058         const unsigned int count                = tables[index].count;
1059         const struct color *const color_entries = tables[index].entries;
1060
1061         if (streq (color_name, "random"))
1062           {
1063             bool excludable;
1064             unsigned int i;
1065             do {
1066               excludable = false;
1067               i = rand() % (count - 2) + 1; /* omit color none and default */
1068               switch (index)
1069                 {
1070                   case FOREGROUND:
1071                     /* --exclude-random */
1072                     if (exclude && streq (exclude, color_entries[i].name))
1073                       excludable = true;
1074                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1075                       excludable = true;
1076                     break;
1077                   case BACKGROUND:
1078                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1079                       excludable = true;
1080                     break;
1081                   default: /* never reached */
1082                     ABORT_TRACE ();
1083                  }
1084             } while (excludable);
1085             colors[index] = (struct color *)&color_entries[i];
1086           }
1087         else
1088           find_color_entry (color_names[index], index, colors);
1089       }
1090 }
1091
1092 static void
1093 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1094 {
1095     bool found = false;
1096     unsigned int i;
1097
1098     const unsigned int count                = tables[index].count;
1099     const struct color *const color_entries = tables[index].entries;
1100
1101     for (i = 0; i < count; i++)
1102       if (streq (color_name->name, color_entries[i].name))
1103         {
1104           colors[index] = (struct color *)&color_entries[i];
1105           found = true;
1106           break;
1107         }
1108     if (!found)
1109       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1110 }
1111
1112 static void
1113 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags)
1114 {
1115     /* --clean[-all] */
1116     if (clean || clean_all)
1117       print_clean (line);
1118     else
1119       {
1120         /* Foreground color code is guaranteed to be set when background color code is present.  */
1121         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1122           printf ("\033[%s", colors[BACKGROUND]->code);
1123         if (colors[FOREGROUND]->code)
1124           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1125         else
1126           printf (formats[FMT_GENERIC], line);
1127       }
1128     if (flags & CR)
1129       putchar ('\r');
1130     if (flags & LF)
1131       putchar ('\n');
1132 }
1133
1134 static void
1135 print_clean (const char *line)
1136 {
1137     const char *p = line;
1138
1139     if (is_esc (p))
1140       p = get_end_of_esc (p);
1141
1142     while (*p != '\0')
1143       {
1144         const char *text_start = p;
1145         const char *text_end = get_end_of_text (p);
1146         print_text (text_start, text_end - text_start);
1147         p = get_end_of_esc (text_end);
1148       }
1149 }
1150
1151 static bool
1152 is_esc (const char *p)
1153 {
1154     return gather_esc_offsets (p, NULL, NULL);
1155 }
1156
1157 static const char *
1158 get_end_of_esc (const char *p)
1159 {
1160     const char *esc;
1161     const char *end = NULL;
1162     while ((esc = strchr (p, '\033')))
1163       {
1164         if (gather_esc_offsets (esc, NULL, &end))
1165           break;
1166         p = esc + 1;
1167       }
1168     return end ? end + 1 : p + strlen (p);
1169 }
1170
1171 static const char *
1172 get_end_of_text (const char *p)
1173 {
1174     const char *esc;
1175     const char *start = NULL;
1176     while ((esc = strchr (p, '\033')))
1177       {
1178         if (gather_esc_offsets (esc, &start, NULL))
1179           break;
1180         p = esc + 1;
1181       }
1182     return start ? start : p + strlen (p);
1183 }
1184
1185 static void
1186 print_text (const char *p, size_t len)
1187 {
1188     size_t bytes_written;
1189     bytes_written = fwrite (p, 1, len, stdout);
1190     if (bytes_written != len)
1191       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1192 }
1193
1194 static bool
1195 gather_esc_offsets (const char *p, const char **start, const char **end)
1196 {
1197     /* ESC[ */
1198     if (*p == 27 && *(p + 1) == '[')
1199       {
1200         bool valid = false;
1201         const char *const begin = p;
1202         p += 2;
1203         if (clean_all)
1204           valid = validate_esc_clean_all (&p);
1205         else if (clean)
1206           {
1207             bool check_values;
1208             unsigned int prev_iter, iter;
1209             const char *digit;
1210             prev_iter = iter = 0;
1211             do {
1212               check_values = false;
1213               iter++;
1214               if (!isdigit (*p))
1215                 break;
1216               digit = p;
1217               while (isdigit (*p))
1218                 p++;
1219               if (p - digit > 2)
1220                 break;
1221               else /* check range */
1222                 {
1223                   char val[3];
1224                   int value;
1225                   unsigned int i;
1226                   const unsigned int digits = p - digit;
1227                   for (i = 0; i < digits; i++)
1228                     val[i] = *digit++;
1229                   val[i] = '\0';
1230                   value = atoi (val);
1231                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1232                 }
1233             } while (check_values);
1234           }
1235         if (valid)
1236           {
1237             if (start)
1238               *start = begin;
1239             if (end)
1240               *end = p;
1241             return true;
1242           }
1243       }
1244     return false;
1245 }
1246
1247 static bool
1248 validate_esc_clean_all (const char **p)
1249 {
1250     while (isdigit (**p) || **p == ';')
1251       (*p)++;
1252     return (**p == 'm');
1253 }
1254
1255 static bool
1256 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1257 {
1258     if (is_reset (value, iter, p))
1259       return true;
1260     else if (is_attr (value, iter, *prev_iter, p))
1261       {
1262         (*p)++;
1263         *check_values = true;
1264         *prev_iter = iter;
1265         return false; /* partial escape sequence, need another valid value */
1266       }
1267     else if (is_fg_color (value, p))
1268       return true;
1269     else if (is_bg_color (value, iter, p))
1270       return true;
1271     else
1272       return false;
1273 }
1274
1275 static bool
1276 is_reset (int value, unsigned int iter, const char **p)
1277 {
1278     return (value == 0 && iter == 1 && **p == 'm');
1279 }
1280
1281 static bool
1282 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1283 {
1284     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1285 }
1286
1287 static bool
1288 is_fg_color (int value, const char **p)
1289 {
1290     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1291 }
1292
1293 static bool
1294 is_bg_color (int value, unsigned int iter, const char **p)
1295 {
1296     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1297 }
1298
1299 #if !DEBUG
1300 static void *
1301 malloc_wrap (size_t size)
1302 {
1303     void *p = malloc (size);
1304     if (!p)
1305       MEM_ALLOC_FAIL ();
1306     return p;
1307 }
1308
1309 static void *
1310 calloc_wrap (size_t nmemb, size_t size)
1311 {
1312     void *p = calloc (nmemb, size);
1313     if (!p)
1314       MEM_ALLOC_FAIL ();
1315     return p;
1316 }
1317
1318 static void *
1319 realloc_wrap (void *ptr, size_t size)
1320 {
1321     void *p = realloc (ptr, size);
1322     if (!p)
1323       MEM_ALLOC_FAIL ();
1324     return p;
1325 }
1326 #else
1327 static void *
1328 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1329 {
1330     void *p = malloc (size);
1331     if (!p)
1332       MEM_ALLOC_FAIL_DEBUG (file, line);
1333     fprintf (log, "%s: malloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1334     return p;
1335 }
1336
1337 static void *
1338 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1339 {
1340     void *p = calloc (nmemb, size);
1341     if (!p)
1342       MEM_ALLOC_FAIL_DEBUG (file, line);
1343     fprintf (log, "%s: calloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)(nmemb * size), file, line);
1344     return p;
1345 }
1346
1347 static void *
1348 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1349 {
1350     void *p = realloc (ptr, size);
1351     if (!p)
1352       MEM_ALLOC_FAIL_DEBUG (file, line);
1353     fprintf (log, "%s: realloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1354     return p;
1355 }
1356 #endif /* !DEBUG */
1357
1358 static void
1359 free_wrap (void **ptr)
1360 {
1361     free (*ptr);
1362     *ptr = NULL;
1363 }
1364
1365 #if !DEBUG
1366 # define do_malloc(len, file, line) malloc_wrap(len)
1367 #else
1368 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1369 #endif
1370
1371 static char *
1372 strdup_wrap (const char *str, const char *file, unsigned int line)
1373 {
1374     const size_t len = strlen (str) + 1;
1375     char *p = do_malloc (len, file, line);
1376     strncpy (p, str, len);
1377     return p;
1378 }
1379
1380 static char *
1381 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1382 {
1383     const size_t len = strlen (str1) + strlen (str2) + 1;
1384     char *p, *str;
1385
1386     p = str = do_malloc (len, file, line);
1387     strncpy (p, str1, strlen (str1));
1388     p += strlen (str1);
1389     strncpy (p, str2, strlen (str2));
1390     p += strlen (str2);
1391     *p = '\0';
1392
1393     return str;
1394 }
1395
1396 static bool
1397 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1398 {
1399     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1400     unsigned long size = bytes;
1401     if (bytes < 1024)
1402       return false;
1403     unit = units;
1404     while (size >= 1024 && *(unit + 1))
1405       {
1406         size /= 1024;
1407         unit++;
1408       }
1409     bytes_size->size = (unsigned int)size;
1410     bytes_size->unit = *unit;
1411     return true;
1412 }
1413
1414 static char *
1415 get_file_type (mode_t mode)
1416 {
1417     if (S_ISREG (mode))
1418       return "file";
1419     else if (S_ISDIR (mode))
1420       return "directory";
1421     else if (S_ISCHR (mode))
1422       return "character device";
1423     else if (S_ISBLK (mode))
1424       return "block device";
1425     else if (S_ISFIFO (mode))
1426       return "named pipe";
1427     else if (S_ISLNK (mode))
1428       return "symbolic link";
1429     else if (S_ISSOCK (mode))
1430       return "socket";
1431     else
1432       return "file";
1433 }
1434
1435 static bool
1436 has_color_name (const char *str, const char *name)
1437 {
1438     char *p;
1439
1440     assert (strlen (str));
1441     assert (strlen (name));
1442
1443     if (!(*str == *name || *str == toupper (*name)))
1444       return false;
1445     else if (*(name + 1) != '\0'
1446      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1447       return false;
1448
1449     return true;
1450 }
1451
1452 static FILE *
1453 open_file (const char *file, const char *mode)
1454 {
1455     FILE *stream;
1456
1457     errno = 0;
1458     stream = fopen (file, mode);
1459     if (!stream)
1460       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1461
1462     return stream;
1463 }
1464
1465 #define DO_VFPRINTF(fmt)                    \
1466     va_list ap;                             \
1467     fprintf (stderr, "%s: ", program_name); \
1468     va_start (ap, fmt);                     \
1469     vfprintf (stderr, fmt, ap);             \
1470     va_end (ap);                            \
1471     fprintf (stderr, "\n");                 \
1472
1473 static void
1474 vfprintf_diag (const char *fmt, ...)
1475 {
1476     DO_VFPRINTF (fmt);
1477 }
1478
1479 static void
1480 vfprintf_fail (const char *fmt, ...)
1481 {
1482     DO_VFPRINTF (fmt);
1483     exit (EXIT_FAILURE);
1484 }
1485
1486 static void
1487 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1488 {
1489     /* nothing to stack */
1490     if (ptr == NULL)
1491       return;
1492     if (!*list)
1493       *list = xmalloc (sizeof (void *));
1494     else
1495       {
1496         unsigned int i;
1497         for (i = 0; i < *stacked; i++)
1498           if (!(*list)[i])
1499             {
1500               (*list)[i] = ptr;
1501               return; /* reused */
1502             }
1503         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1504       }
1505     (*list)[index] = ptr;
1506     (*stacked)++;
1507 }
1508
1509 static void
1510 release_var (void **list, unsigned int stacked, void **ptr)
1511 {
1512     unsigned int i;
1513     /* nothing to release */
1514     if (*ptr == NULL)
1515       return;
1516     for (i = 0; i < stacked; i++)
1517       if (list[i] == *ptr)
1518         {
1519           free (*ptr);
1520           *ptr = NULL;
1521           list[i] = NULL;
1522           return;
1523         }
1524 }