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 "0.61"
 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
 226 static FILE *stream;
 227 #if DEBUG
 228 static FILE *log;
 229 #endif
 230
 231 static unsigned int stacked_vars;
 232 static void **vars_list;
 233
 234 static bool clean;
 235 static bool clean_all;
 236
 237 static char attr[MAX_ATTRIBUTE_CHARS + 1];
 238 static char *exclude;
 239
 240 static const char *program_name;
 241
 242 static void process_opts (int, char **);
 243 static void process_opt_attr (const char *);
 244 static void write_attr (unsigned int, unsigned int *, enum attr_type, const char *);
 245 static void print_hint (void);
 246 static void print_help (void);
 247 static void print_version (void);
 248 static void cleanup (void);
 249 static void free_color_names (struct color_name **);
 250 static void process_args (unsigned int, char **, char *, const struct color **, const char **, FILE **);
 251 static void process_file_arg (const char *, const char **, FILE **);
 252 static void skip_path_colors (const char *, const char *, const struct stat *);
 253 static void gather_color_names (const char *, char *, struct color_name **);
 254 static void read_print_stream (const char *, const struct color **, const char *, FILE *);
 255 static void merge_print_line (const char *, const char *, FILE *);
 256 static void complete_part_line (const char *, char **, FILE *);
 257 static bool get_next_char (char *, const char **, FILE *, bool *);
 258 static void save_char (char, char **, size_t *, size_t *);
 259 static void find_color_entries (struct color_name **, const struct color **);
 260 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 261 static void print_line (const char *, const struct color **, const char * const, unsigned int);
 262 static void print_clean (const char *);
 263 static bool is_esc (const char *);
 264 static const char *get_end_of_esc (const char *);
 265 static const char *get_end_of_text (const char *);
 266 static void print_text (const char *, size_t);
 267 static bool gather_esc_offsets (const char *, const char **, const char **);
 268 static bool validate_esc_clean_all (const char **);
 269 static bool validate_esc_clean (int, unsigned int, unsigned int *, const char **, bool *);
 270 static bool is_reset (int, unsigned int, const char **);
 271 static bool is_attr (int, unsigned int, unsigned int, const char **);
 272 static bool is_fg_color (int, const char **);
 273 static bool is_bg_color (int, unsigned int, const char **);
 274 #if !DEBUG
 275 static void *malloc_wrap (size_t);
 276 static void *calloc_wrap (size_t, size_t);
 277 static void *realloc_wrap (void *, size_t);
 278 #else
 279 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 280 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 281 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 282 #endif
 283 static void free_wrap (void **);
 284 static char *strdup_wrap (const char *, const char *, unsigned int);
 285 static char *str_concat_wrap (const char *, const char *, const char *, unsigned int);
 286 static bool get_bytes_size (unsigned long, struct bytes_size *);
 287 static char *get_file_type (mode_t);
 288 static bool has_color_name (const char *, const char *);
 289 static FILE *open_file (const char *, const char *);
 290 static void vfprintf_diag (const char *, ...);
 291 static void vfprintf_fail (const char *, ...);
 292 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 293 static void release_var (void **, unsigned int, void **);
 294
 295 extern int optind;
 296
 297 int
 298 main (int argc, char **argv)
 299 {
 300     unsigned int arg_cnt;
 301
 302     const struct color *colors[2] = {
 303         NULL, /* foreground */
 304         NULL, /* background */
 305     };
 306
 307     const char *file = NULL;
 308
 309     program_name = argv[0];
 310     atexit (cleanup);
 311
 312     setvbuf (stdout, NULL, _IOLBF, 0);
 313
 314 #if DEBUG
 315     log = open_file (DEBUG_FILE, "w");
 316 #endif
 317
 318     attr[0] = '\0';
 319
 320     process_opts (argc, argv);
 321
 322     arg_cnt = argc - optind;
 323
 324     if (clean || clean_all)
 325       {
 326         if (clean && clean_all)
 327           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 328         if (arg_cnt > 1)
 329           {
 330             const char *format = "%s %s";
 331             const char *message = "switch cannot be used with more than one file";
 332             if (clean)
 333               vfprintf_fail (format, "--clean", message);
 334             else if (clean_all)
 335               vfprintf_fail (format, "--clean-all", message);
 336           }
 337       }
 338     else
 339       {
 340         if (arg_cnt == 0 || arg_cnt > 2)
 341           {
 342             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
 343             print_hint ();
 344             exit (EXIT_FAILURE);
 345           }
 346       }
 347
 348     if (clean || clean_all)
 349       process_file_arg (argv[optind], &file, &stream);
 350     else
 351       process_args (arg_cnt, &argv[optind], &attr[0], colors, &file, &stream);
 352     read_print_stream (&attr[0], colors, file, stream);
 353
 354     RELEASE_VAR (exclude);
 355
 356     exit (EXIT_SUCCESS);
 357 }
 358
 359 #define PRINT_HELP_EXIT() \
 360     print_help ();        \
 361     exit (EXIT_SUCCESS);  \
 362
 363 #define PRINT_VERSION_EXIT() \
 364     print_version ();        \
 365     exit (EXIT_SUCCESS);     \
 366
 367 extern char *optarg;
 368
 369 static void
 370 process_opts (int argc, char **argv)
 371 {
 372     int opt;
 373     while ((opt = getopt_long (argc, argv, "hV", long_opts, NULL)) != -1)
 374       {
 375         switch (opt)
 376           {
 377             case 0: /* long opts */
 378               switch (opt_type)
 379                 {
 380                   case OPT_ATTR:
 381                     process_opt_attr (optarg);
 382                     break;
 383                   case OPT_CLEAN:
 384                     clean = true;
 385                     break;
 386                   case OPT_CLEAN_ALL:
 387                     clean_all = true;
 388                     break;
 389                   case OPT_EXCLUDE_RANDOM: {
 390                     bool valid = false;
 391                     unsigned int i;
 392                     exclude = xstrdup (optarg);
 393                     STACK_VAR (exclude);
 394                     for (i = 1; i < tables[GENERIC].count - 1; i++) /* skip color none and default */
 395                       {
 396                         const struct color *entry = &tables[GENERIC].entries[i];
 397                         if (streq (exclude, entry->name))
 398                           {
 399                             valid = true;
 400                             break;
 401                           }
 402                       }
 403                     if (!valid)
 404                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain color");
 405                     break;
 406                   }
 407                   case OPT_HELP:
 408                     PRINT_HELP_EXIT ();
 409                   case OPT_VERSION:
 410                     PRINT_VERSION_EXIT ();
 411                   default: /* never reached */
 412                     ABORT_TRACE ();
 413                 }
 414               break;
 415             case 'h':
 416               PRINT_HELP_EXIT ();
 417             case 'V':
 418               PRINT_VERSION_EXIT ();
 419             case '?':
 420               print_hint ();
 421               exit (EXIT_FAILURE);
 422             default: /* never reached */
 423               ABORT_TRACE ();
 424           }
 425       }
 426 }
 427
 428 static void
 429 process_opt_attr (const char *p)
 430 {
 431     /* If attributes are added to this "list", also increase MAX_ATTRIBUTE_CHARS!  */
 432     const struct attr {
 433         const char *name;
 434         unsigned int val;
 435         enum attr_type type;
 436     } attrs[] = {
 437         { "bold",       1, ATTR_BOLD       },
 438         { "underscore", 4, ATTR_UNDERSCORE },
 439         { "blink",      5, ATTR_BLINK      },
 440         { "reverse",    7, ATTR_REVERSE    },
 441         { "concealed",  8, ATTR_CONCEALED  },
 442     };
 443     unsigned int attr_types = 0;
 444
 445     while (*p)
 446       {
 447         const char *s;
 448         if (!isalnum (*p))
 449           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must be provided a string");
 450         s = p;
 451         while (isalnum (*p))
 452           p++;
 453         if (*p != '\0' && *p != ',')
 454           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must have strings separated by ,");
 455         else
 456           {
 457             bool valid_attr = false;
 458             unsigned int i;
 459             for (i = 0; i < sizeof (attrs) / sizeof (struct attr); i++)
 460               {
 461                 size_t name_len = strlen (attrs[i].name);
 462                 if ((size_t)(p - s) == name_len && strneq (s, attrs[i].name, name_len))
 463                   {
 464                     write_attr (attrs[i].val, &attr_types, attrs[i].type, attrs[i].name);
 465                     valid_attr = true;
 466                     break;
 467                   }
 468               }
 469             if (!valid_attr)
 470               vfprintf_fail (formats[FMT_GENERIC], "--attr switch must be provided valid attribute names");
 471           }
 472         if (*p)
 473           p++;
 474       }
 475 }
 476
 477 static void
 478 write_attr (unsigned int val, unsigned int *attr_types, enum attr_type attr_type, const char *attr_name)
 479 {
 480     if (*attr_types & attr_type)
 481       vfprintf_fail ("--attr switch has attribute '%s' twice or more", attr_name);
 482     snprintf (attr + strlen (attr), 3, "%u;", val);
 483     *attr_types |= attr_type;
 484 }
 485
 486 static void
 487 print_hint (void)
 488 {
 489     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 490 }
 491
 492 static void
 493 print_help (void)
 494 {
 495     struct short_opt {
 496         const char *name;
 497         const char *short_opt;
 498     };
 499     const struct short_opt short_opts[] = {
 500         { "help",    "h" },
 501         { "version", "V" },
 502     };
 503     const struct option *opt = long_opts;
 504     unsigned int i;
 505
 506     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 507     printf ("\tColors (foreground) (background)\n");
 508     for (i = 0; i < tables[FOREGROUND].count; i++)
 509       {
 510         const struct color *entry = &tables[FOREGROUND].entries[i];
 511         const char *name = entry->name;
 512         const char *code = entry->code;
 513         if (code)
 514           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 515                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 516         else
 517           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 518       }
 519     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 520
 521     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 522     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 523
 524     printf ("\n\tOptions\n");
 525     for (; opt->name; opt++)
 526       {
 527         const char *short_opt = NULL;
 528         unsigned int i;
 529         for (i = 0; i < sizeof (short_opts) / sizeof (struct short_opt); i++)
 530           {
 531             if (streq (opt->name, short_opts[i].name))
 532               {
 533                 short_opt = short_opts[i].short_opt;
 534                 break;
 535               }
 536           }
 537         if (short_opt)
 538           printf ("\t\t-%s, --%s\n", short_opt, opt->name);
 539         else
 540           printf ("\t\t    --%s\n", opt->name);
 541       }
 542     printf ("\n");
 543 }
 544
 545 static void
 546 print_version (void)
 547 {
 548 #ifdef HAVE_VERSION
 549 # include "version.h"
 550 #else
 551     const char *version = NULL;
 552 #endif
 553     const char *version_prefix, *version_string;
 554     const char *c_flags, *ld_flags, *cpp_flags;
 555     struct bytes_size bytes_size;
 556     bool debug;
 557 #ifdef CFLAGS
 558     c_flags = to_str (CFLAGS);
 559 #else
 560     c_flags = "unknown";
 561 #endif
 562 #ifdef LDFLAGS
 563     ld_flags = to_str (LDFLAGS);
 564 #else
 565     ld_flags = "unknown";
 566 #endif
 567 #ifdef CPPFLAGS
 568     cpp_flags = to_str (CPPFLAGS);
 569 #else
 570     cpp_flags = "unknown";
 571 #endif
 572 #if DEBUG
 573     debug = true;
 574 #else
 575     debug = false;
 576 #endif
 577     version_prefix = version ? "" : "v";
 578     version_string = version ? version : VERSION;
 579     printf ("colorize %s%s (compiled at %s, %s)\n", version_prefix, version_string, __DATE__, __TIME__);
 580
 581     printf ("Compiler flags: %s\n", c_flags);
 582     printf ("Linker flags: %s\n", ld_flags);
 583     printf ("Preprocessor flags: %s\n", cpp_flags);
 584     if (get_bytes_size (BUF_SIZE, &bytes_size))
 585       {
 586         if (BUF_SIZE % 1024 == 0)
 587           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 588         else
 589           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 590                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 591       }
 592     else
 593       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 594     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 595     printf ("Debugging: %s\n", debug ? "yes" : "no");
 596 }
 597
 598 static void
 599 cleanup (void)
 600 {
 601     if (stream && fileno (stream) != STDIN_FILENO)
 602       fclose (stream);
 603 #if DEBUG
 604     if (log)
 605       fclose (log);
 606 #endif
 607
 608     if (vars_list)
 609       {
 610         unsigned int i;
 611         for (i = 0; i < stacked_vars; i++)
 612           free (vars_list[i]);
 613         free_null (vars_list);
 614       }
 615 }
 616
 617 static void
 618 free_color_names (struct color_name **color_names)
 619 {
 620     unsigned int i;
 621     for (i = 0; color_names[i]; i++)
 622       {
 623         RELEASE_VAR (color_names[i]->name);
 624         RELEASE_VAR (color_names[i]->orig);
 625         RELEASE_VAR (color_names[i]);
 626       }
 627 }
 628
 629 static void
 630 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream)
 631 {
 632     int ret;
 633     char *p;
 634     struct stat sb;
 635     struct color_name *color_names[3] = { NULL, NULL, NULL };
 636
 637     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 638     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 639
 640     assert (color_string);
 641
 642     if (streq (color_string, "-"))
 643       {
 644         if (file_string)
 645           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 646         else
 647           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 648       }
 649
 650     ret = lstat (color_string, &sb);
 651
 652     /* Ensure that we don't fail if there's a file with one or more
 653        color names in its path.  */
 654     if (ret == 0) /* success */
 655       skip_path_colors (color_string, file_string, &sb);
 656
 657     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 658       {
 659         if (p == color_string)
 660           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
 661         else if (p == color_string + strlen (color_string) - 1)
 662           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
 663         else if (strchr (++p, COLOR_SEP_CHAR))
 664           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
 665       }
 666
 667     gather_color_names (color_string, attr, color_names);
 668
 669     assert (color_names[FOREGROUND]);
 670
 671     if (color_names[BACKGROUND])
 672       {
 673         unsigned int i;
 674         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 675         for (i = 0; i < 2; i++)
 676           {
 677             const unsigned int color1 = color_sets[i][0];
 678             const unsigned int color2 = color_sets[i][1];
 679             if (CHECK_COLORS_RANDOM (color1, color2))
 680               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 681           }
 682       }
 683
 684     find_color_entries (color_names, colors);
 685     free_color_names (color_names);
 686
 687     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 688       {
 689         struct color_name color_name;
 690         color_name.name = color_name.orig = "default";
 691
 692         find_color_entry (&color_name, FOREGROUND, colors);
 693       }
 694
 695     process_file_arg (file_string, file, stream);
 696 }
 697
 698 static void
 699 process_file_arg (const char *file_string, const char **file, FILE **stream)
 700 {
 701     if (file_string)
 702       {
 703         if (streq (file_string, "-"))
 704           *stream = stdin;
 705         else
 706           {
 707             const char *file = file_string;
 708             struct stat sb;
 709             int ret;
 710
 711             errno = 0;
 712             ret = stat (file, &sb);
 713
 714             if (ret == -1)
 715               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 716
 717             if (!VALID_FILE_TYPE (sb.st_mode))
 718               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
 719
 720             *stream = open_file (file, "r");
 721           }
 722         *file = file_string;
 723       }
 724     else
 725       {
 726         *stream = stdin;
 727         *file = "stdin";
 728       }
 729
 730     assert (*stream);
 731     assert (*file);
 732 }
 733
 734 static void
 735 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb)
 736 {
 737     bool have_file;
 738     unsigned int c;
 739     const char *color = color_string;
 740     const mode_t mode = sb->st_mode;
 741
 742     for (c = 1; c <= 2 && *color; c++)
 743       {
 744         bool matched = false;
 745         unsigned int i;
 746         for (i = 0; i < tables[GENERIC].count; i++)
 747           {
 748             const struct color *entry = &tables[GENERIC].entries[i];
 749             if (has_color_name (color, entry->name))
 750               {
 751                 color += strlen (entry->name);
 752                 matched = true;
 753                 break;
 754               }
 755           }
 756         if (!matched && has_color_name (color, "random"))
 757           {
 758             color += strlen ("random");
 759             matched = true;
 760           }
 761         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 762           color++;
 763         else
 764           break;
 765       }
 766
 767     have_file = (*color != '\0');
 768
 769     if (have_file)
 770       {
 771         const char *file_exists = color_string;
 772         if (file_string)
 773           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_exists, "cannot be used as color string");
 774         else
 775           {
 776             if (VALID_FILE_TYPE (mode))
 777               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_exists, "must be preceded by color string");
 778             else
 779               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_exists, "is not a valid file type");
 780           }
 781       }
 782 }
 783
 784 static void
 785 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
 786 {
 787     unsigned int index;
 788     char *color, *p, *str;
 789
 790     str = xstrdup (color_string);
 791     STACK_VAR (str);
 792
 793     for (index = 0, color = str; *color; index++, color = p)
 794       {
 795         char *ch, *sep;
 796
 797         p = NULL;
 798         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 799           {
 800             *sep = '\0';
 801             p = sep + 1;
 802           }
 803         else
 804           p = color + strlen (color);
 805         assert (p);
 806
 807         for (ch = color; *ch; ch++)
 808           if (!isalpha (*ch))
 809             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 810
 811         for (ch = color + 1; *ch; ch++)
 812           if (!islower (*ch))
 813             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 814
 815         if (streq (color, "None"))
 816           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 817
 818         if (isupper (*color))
 819           {
 820             switch (index)
 821               {
 822                 case FOREGROUND:
 823                   snprintf (attr + strlen (attr), 3, "1;");
 824                   break;
 825                 case BACKGROUND:
 826                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 827                 default: /* never reached */
 828                   ABORT_TRACE ();
 829               }
 830           }
 831
 832         color_names[index] = xcalloc (1, sizeof (struct color_name));
 833         STACK_VAR (color_names[index]);
 834
 835         color_names[index]->orig = xstrdup (color);
 836         STACK_VAR (color_names[index]->orig);
 837
 838         for (ch = color; *ch; ch++)
 839           *ch = tolower (*ch);
 840
 841         color_names[index]->name = xstrdup (color);
 842         STACK_VAR (color_names[index]->name);
 843       }
 844
 845     RELEASE_VAR (str);
 846 }
 847
 848 static void
 849 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
 850 {
 851     char buf[BUF_SIZE + 1];
 852     unsigned int flags = 0;
 853
 854     while (!feof (stream))
 855       {
 856         size_t bytes_read;
 857         char *eol;
 858         const char *line;
 859         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 860         if (bytes_read != BUF_SIZE && ferror (stream))
 861           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 862         buf[bytes_read] = '\0';
 863         line = buf;
 864         while ((eol = strpbrk (line, "\n\r")))
 865           {
 866             const char *p;
 867             flags &= ~(CR|LF);
 868             if (*eol == '\r')
 869               {
 870                 flags |= CR;
 871                 if (*(eol + 1) == '\n')
 872                   flags |= LF;
 873               }
 874             else if (*eol == '\n')
 875               flags |= LF;
 876             else
 877               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 878             p = eol + SKIP_LINE_ENDINGS (flags);
 879             *eol = '\0';
 880             print_line (attr, colors, line, flags);
 881             line = p;
 882           }
 883         if (feof (stream))
 884           {
 885             if (*line != '\0')
 886               print_line (attr, colors, line, 0);
 887           }
 888         else if (*line != '\0')
 889           {
 890             char *p;
 891             if ((clean || clean_all) && (p = strrchr (line, '\033')))
 892               merge_print_line (line, p, stream);
 893             else
 894               print_line (attr, colors, line, 0);
 895           }
 896       }
 897 }
 898
 899 static void
 900 merge_print_line (const char *line, const char *p, FILE *stream)
 901 {
 902     char *buf = NULL;
 903     char *merged_esc = NULL;
 904     const char *esc = "";
 905     const char char_restore = *p;
 906
 907     complete_part_line (p + 1, &buf, stream);
 908
 909     if (buf)
 910       {
 911         /* form escape sequence */
 912         esc = merged_esc = str_concat (p, buf);
 913         /* shorten partial line accordingly */
 914         *(char *)p = '\0';
 915         free (buf);
 916       }
 917
 918 #ifdef TEST_MERGE_PART_LINE
 919     printf ("%s%s", line, esc);
 920     fflush (stdout);
 921     _exit (EXIT_SUCCESS);
 922 #else
 923     print_clean (line);
 924     *(char *)p = char_restore;
 925     print_clean (esc);
 926     free (merged_esc);
 927 #endif
 928 }
 929
 930 static void
 931 complete_part_line (const char *p, char **buf, FILE *stream)
 932 {
 933     bool got_next_char = false, read_from_stream;
 934     char ch;
 935     size_t i = 0, size;
 936
 937     if (get_next_char (&ch, &p, stream, &read_from_stream))
 938       {
 939         if (ch == '[')
 940           {
 941             if (read_from_stream)
 942               save_char (ch, buf, &i, &size);
 943           }
 944         else
 945           {
 946             if (read_from_stream)
 947               ungetc ((int)ch, stream);
 948             return; /* cancel */
 949           }
 950       }
 951     else
 952       return; /* cancel */
 953
 954     while (get_next_char (&ch, &p, stream, &read_from_stream))
 955       {
 956         if (isdigit (ch) || ch == ';')
 957           {
 958             if (read_from_stream)
 959               save_char (ch, buf, &i, &size);
 960           }
 961         else /* read next character */
 962           {
 963             got_next_char = true;
 964             break;
 965           }
 966       }
 967
 968     if (got_next_char)
 969       {
 970         if (ch == 'm')
 971           {
 972             if (read_from_stream)
 973               save_char (ch, buf, &i, &size);
 974           }
 975         else
 976           {
 977             if (read_from_stream)
 978               ungetc ((int)ch, stream);
 979             return; /* cancel */
 980           }
 981       }
 982     else
 983       return; /* cancel */
 984 }
 985
 986 static bool
 987 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
 988 {
 989     if (**p == '\0')
 990       {
 991         int c;
 992         if ((c = fgetc (stream)) != EOF)
 993           {
 994             *ch = (char)c;
 995             *read_from_stream = true;
 996             return true;
 997           }
 998         else
 999           {
1000             *read_from_stream = false;
1001             return false;
1002           }
1003       }
1004     else
1005       {
1006         *ch = **p;
1007         (*p)++;
1008         *read_from_stream = false;
1009         return true;
1010       }
1011 }
1012
1013 static void
1014 save_char (char ch, char **buf, size_t *i, size_t *size)
1015 {
1016     if (!*buf)
1017       {
1018         *size = ALLOC_COMPLETE_PART_LINE;
1019         *buf = xmalloc (*size);
1020       }
1021     /* +1: effective occupied size of buffer */
1022     else if ((*i + 1) == *size)
1023       {
1024         *size *= 2;
1025         *buf = xrealloc (*buf, *size);
1026       }
1027     (*buf)[*i] = ch;
1028     (*buf)[*i + 1] = '\0';
1029     (*i)++;
1030 }
1031
1032 static void
1033 find_color_entries (struct color_name **color_names, const struct color **colors)
1034 {
1035     struct timeval tv;
1036     unsigned int index;
1037
1038     /* randomness */
1039     gettimeofday (&tv, NULL);
1040     srand (tv.tv_usec * tv.tv_sec);
1041
1042     for (index = 0; color_names[index]; index++)
1043       {
1044         const char *color_name = color_names[index]->name;
1045
1046         const unsigned int count                = tables[index].count;
1047         const struct color *const color_entries = tables[index].entries;
1048
1049         if (streq (color_name, "random"))
1050           {
1051             bool excludable;
1052             unsigned int i;
1053             do {
1054               excludable = false;
1055               i = rand() % (count - 2) + 1; /* omit color none and default */
1056               switch (index)
1057                 {
1058                   case FOREGROUND:
1059                     /* --exclude-random */
1060                     if (exclude && streq (exclude, color_entries[i].name))
1061                       excludable = true;
1062                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1063                       excludable = true;
1064                     break;
1065                   case BACKGROUND:
1066                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1067                       excludable = true;
1068                     break;
1069                   default: /* never reached */
1070                     ABORT_TRACE ();
1071                  }
1072             } while (excludable);
1073             colors[index] = (struct color *)&color_entries[i];
1074           }
1075         else
1076           find_color_entry (color_names[index], index, colors);
1077       }
1078 }
1079
1080 static void
1081 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1082 {
1083     bool found = false;
1084     unsigned int i;
1085
1086     const unsigned int count                = tables[index].count;
1087     const struct color *const color_entries = tables[index].entries;
1088
1089     for (i = 0; i < count; i++)
1090       if (streq (color_name->name, color_entries[i].name))
1091         {
1092           colors[index] = (struct color *)&color_entries[i];
1093           found = true;
1094           break;
1095         }
1096     if (!found)
1097       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1098 }
1099
1100 static void
1101 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags)
1102 {
1103     /* --clean[-all] */
1104     if (clean || clean_all)
1105       print_clean (line);
1106     else
1107       {
1108         /* Foreground color code is guaranteed to be set when background color code is present.  */
1109         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1110           printf ("\033[%s", colors[BACKGROUND]->code);
1111         if (colors[FOREGROUND]->code)
1112           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1113         else
1114           printf (formats[FMT_GENERIC], line);
1115       }
1116     if (flags & CR)
1117       putchar ('\r');
1118     if (flags & LF)
1119       putchar ('\n');
1120 }
1121
1122 static void
1123 print_clean (const char *line)
1124 {
1125     const char *p = line;
1126
1127     if (is_esc (p))
1128       p = get_end_of_esc (p);
1129
1130     while (*p != '\0')
1131       {
1132         const char *text_start = p;
1133         const char *text_end = get_end_of_text (p);
1134         print_text (text_start, text_end - text_start);
1135         p = get_end_of_esc (text_end);
1136       }
1137 }
1138
1139 static bool
1140 is_esc (const char *p)
1141 {
1142     return gather_esc_offsets (p, NULL, NULL);
1143 }
1144
1145 static const char *
1146 get_end_of_esc (const char *p)
1147 {
1148     const char *esc;
1149     const char *end = NULL;
1150     while ((esc = strchr (p, '\033')))
1151       {
1152         if (gather_esc_offsets (esc, NULL, &end))
1153           break;
1154         p = esc + 1;
1155       }
1156     return end ? end + 1 : p + strlen (p);
1157 }
1158
1159 static const char *
1160 get_end_of_text (const char *p)
1161 {
1162     const char *esc;
1163     const char *start = NULL;
1164     while ((esc = strchr (p, '\033')))
1165       {
1166         if (gather_esc_offsets (esc, &start, NULL))
1167           break;
1168         p = esc + 1;
1169       }
1170     return start ? start : p + strlen (p);
1171 }
1172
1173 static void
1174 print_text (const char *p, size_t len)
1175 {
1176     size_t bytes_written;
1177     bytes_written = fwrite (p, 1, len, stdout);
1178     if (bytes_written != len)
1179       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1180 }
1181
1182 static bool
1183 gather_esc_offsets (const char *p, const char **start, const char **end)
1184 {
1185     /* ESC[ */
1186     if (*p == 27 && *(p + 1) == '[')
1187       {
1188         bool valid = false;
1189         const char *const begin = p;
1190         p += 2;
1191         if (clean_all)
1192           valid = validate_esc_clean_all (&p);
1193         else if (clean)
1194           {
1195             bool check_values;
1196             unsigned int prev_iter, iter;
1197             const char *digit;
1198             prev_iter = iter = 0;
1199             do {
1200               check_values = false;
1201               iter++;
1202               if (!isdigit (*p))
1203                 break;
1204               digit = p;
1205               while (isdigit (*p))
1206                 p++;
1207               if (p - digit > 2)
1208                 break;
1209               else /* check range */
1210                 {
1211                   char val[3];
1212                   int value;
1213                   unsigned int i;
1214                   const unsigned int digits = p - digit;
1215                   for (i = 0; i < digits; i++)
1216                     val[i] = *digit++;
1217                   val[i] = '\0';
1218                   value = atoi (val);
1219                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1220                 }
1221             } while (check_values);
1222           }
1223         if (valid)
1224           {
1225             if (start)
1226               *start = begin;
1227             if (end)
1228               *end = p;
1229             return true;
1230           }
1231       }
1232     return false;
1233 }
1234
1235 static bool
1236 validate_esc_clean_all (const char **p)
1237 {
1238     while (isdigit (**p) || **p == ';')
1239       (*p)++;
1240     return (**p == 'm');
1241 }
1242
1243 static bool
1244 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1245 {
1246     if (is_reset (value, iter, p))
1247       return true;
1248     else if (is_attr (value, iter, *prev_iter, p))
1249       {
1250         (*p)++;
1251         *check_values = true;
1252         *prev_iter = iter;
1253         return false; /* partial escape sequence, need another valid value */
1254       }
1255     else if (is_fg_color (value, p))
1256       return true;
1257     else if (is_bg_color (value, iter, p))
1258       return true;
1259     else
1260       return false;
1261 }
1262
1263 static bool
1264 is_reset (int value, unsigned int iter, const char **p)
1265 {
1266     return (value == 0 && iter == 1 && **p == 'm');
1267 }
1268
1269 static bool
1270 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1271 {
1272     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1273 }
1274
1275 static bool
1276 is_fg_color (int value, const char **p)
1277 {
1278     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1279 }
1280
1281 static bool
1282 is_bg_color (int value, unsigned int iter, const char **p)
1283 {
1284     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1285 }
1286
1287 #if !DEBUG
1288 static void *
1289 malloc_wrap (size_t size)
1290 {
1291     void *p = malloc (size);
1292     if (!p)
1293       MEM_ALLOC_FAIL ();
1294     return p;
1295 }
1296
1297 static void *
1298 calloc_wrap (size_t nmemb, size_t size)
1299 {
1300     void *p = calloc (nmemb, size);
1301     if (!p)
1302       MEM_ALLOC_FAIL ();
1303     return p;
1304 }
1305
1306 static void *
1307 realloc_wrap (void *ptr, size_t size)
1308 {
1309     void *p = realloc (ptr, size);
1310     if (!p)
1311       MEM_ALLOC_FAIL ();
1312     return p;
1313 }
1314 #else
1315 static void *
1316 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1317 {
1318     void *p = malloc (size);
1319     if (!p)
1320       MEM_ALLOC_FAIL_DEBUG (file, line);
1321     fprintf (log, "%s: malloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1322     return p;
1323 }
1324
1325 static void *
1326 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1327 {
1328     void *p = calloc (nmemb, size);
1329     if (!p)
1330       MEM_ALLOC_FAIL_DEBUG (file, line);
1331     fprintf (log, "%s: calloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)(nmemb * size), file, line);
1332     return p;
1333 }
1334
1335 static void *
1336 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1337 {
1338     void *p = realloc (ptr, size);
1339     if (!p)
1340       MEM_ALLOC_FAIL_DEBUG (file, line);
1341     fprintf (log, "%s: realloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1342     return p;
1343 }
1344 #endif /* !DEBUG */
1345
1346 static void
1347 free_wrap (void **ptr)
1348 {
1349     free (*ptr);
1350     *ptr = NULL;
1351 }
1352
1353 #if !DEBUG
1354 # define do_malloc(len, file, line) malloc_wrap(len)
1355 #else
1356 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1357 #endif
1358
1359 static char *
1360 strdup_wrap (const char *str, const char *file, unsigned int line)
1361 {
1362     const size_t len = strlen (str) + 1;
1363     char *p = do_malloc (len, file, line);
1364     strncpy (p, str, len);
1365     return p;
1366 }
1367
1368 static char *
1369 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1370 {
1371     const size_t len = strlen (str1) + strlen (str2) + 1;
1372     char *p, *str;
1373
1374     p = str = do_malloc (len, file, line);
1375     strncpy (p, str1, strlen (str1));
1376     p += strlen (str1);
1377     strncpy (p, str2, strlen (str2));
1378     p += strlen (str2);
1379     *p = '\0';
1380
1381     return str;
1382 }
1383
1384 static bool
1385 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1386 {
1387     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1388     unsigned long size = bytes;
1389     if (bytes < 1024)
1390       return false;
1391     unit = units;
1392     while (size >= 1024 && *(unit + 1))
1393       {
1394         size /= 1024;
1395         unit++;
1396       }
1397     bytes_size->size = (unsigned int)size;
1398     bytes_size->unit = *unit;
1399     return true;
1400 }
1401
1402 static char *
1403 get_file_type (mode_t mode)
1404 {
1405     if (S_ISREG (mode))
1406       return "file";
1407     else if (S_ISDIR (mode))
1408       return "directory";
1409     else if (S_ISCHR (mode))
1410       return "character device";
1411     else if (S_ISBLK (mode))
1412       return "block device";
1413     else if (S_ISFIFO (mode))
1414       return "named pipe";
1415     else if (S_ISLNK (mode))
1416       return "symbolic link";
1417     else if (S_ISSOCK (mode))
1418       return "socket";
1419     else
1420       return "file";
1421 }
1422
1423 static bool
1424 has_color_name (const char *str, const char *name)
1425 {
1426     char *p;
1427
1428     assert (strlen (str));
1429     assert (strlen (name));
1430
1431     if (!(*str == *name || *str == toupper (*name)))
1432       return false;
1433     else if (*(name + 1) != '\0'
1434      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1435       return false;
1436
1437     return true;
1438 }
1439
1440 static FILE *
1441 open_file (const char *file, const char *mode)
1442 {
1443     FILE *stream;
1444
1445     errno = 0;
1446     stream = fopen (file, mode);
1447     if (!stream)
1448       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1449
1450     return stream;
1451 }
1452
1453 #define DO_VFPRINTF(fmt)                    \
1454     va_list ap;                             \
1455     fprintf (stderr, "%s: ", program_name); \
1456     va_start (ap, fmt);                     \
1457     vfprintf (stderr, fmt, ap);             \
1458     va_end (ap);                            \
1459     fprintf (stderr, "\n");                 \
1460
1461 static void
1462 vfprintf_diag (const char *fmt, ...)
1463 {
1464     DO_VFPRINTF (fmt);
1465 }
1466
1467 static void
1468 vfprintf_fail (const char *fmt, ...)
1469 {
1470     DO_VFPRINTF (fmt);
1471     exit (EXIT_FAILURE);
1472 }
1473
1474 static void
1475 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1476 {
1477     /* nothing to stack */
1478     if (ptr == NULL)
1479       return;
1480     if (!*list)
1481       *list = xmalloc (sizeof (void *));
1482     else
1483       {
1484         unsigned int i;
1485         for (i = 0; i < *stacked; i++)
1486           if (!(*list)[i])
1487             {
1488               (*list)[i] = ptr;
1489               return; /* reused */
1490             }
1491         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1492       }
1493     (*list)[index] = ptr;
1494     (*stacked)++;
1495 }
1496
1497 static void
1498 release_var (void **list, unsigned int stacked, void **ptr)
1499 {
1500     unsigned int i;
1501     /* nothing to release */
1502     if (*ptr == NULL)
1503       return;
1504     for (i = 0; i < stacked; i++)
1505       if (list[i] == *ptr)
1506         {
1507           free (*ptr);
1508           *ptr = NULL;
1509           list[i] = NULL;
1510           return;
1511         }
1512 }