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 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               vfprintf_fail (formats[FMT_GENERIC], "--attr switch must be provided valid attribute names");
 472           }
 473         if (*p)
 474           p++;
 475       }
 476 }
 477
 478 static void
 479 write_attr (const struct attr *attr_i, unsigned int *attr_types)
 480 {
 481     const unsigned int val = attr_i->val;
 482     const enum attr_type attr_type = attr_i->type;
 483     const char *attr_name = attr_i->name;
 484
 485     if (*attr_types & attr_type)
 486       vfprintf_fail ("--attr switch has attribute '%s' twice or more", attr_name);
 487     snprintf (attr + strlen (attr), 3, "%u;", val);
 488     *attr_types |= attr_type;
 489 }
 490
 491 static void
 492 print_hint (void)
 493 {
 494     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 495 }
 496
 497 static void
 498 print_help (void)
 499 {
 500     struct short_opt {
 501         const char *name;
 502         const char *short_opt;
 503     };
 504     const struct short_opt short_opts[] = {
 505         { "help",    "h" },
 506         { "version", "V" },
 507     };
 508     const struct option *opt = long_opts;
 509     unsigned int i;
 510
 511     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 512     printf ("\tColors (foreground) (background)\n");
 513     for (i = 0; i < tables[FOREGROUND].count; i++)
 514       {
 515         const struct color *entry = &tables[FOREGROUND].entries[i];
 516         const char *name = entry->name;
 517         const char *code = entry->code;
 518         if (code)
 519           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 520                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 521         else
 522           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 523       }
 524     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 525
 526     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 527     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 528
 529     printf ("\n\tOptions\n");
 530     for (; opt->name; opt++)
 531       {
 532         const char *short_opt = NULL;
 533         unsigned int i;
 534         for (i = 0; i < sizeof (short_opts) / sizeof (struct short_opt); i++)
 535           {
 536             if (streq (opt->name, short_opts[i].name))
 537               {
 538                 short_opt = short_opts[i].short_opt;
 539                 break;
 540               }
 541           }
 542         if (short_opt)
 543           printf ("\t\t-%s, --%s\n", short_opt, opt->name);
 544         else
 545           printf ("\t\t    --%s\n", opt->name);
 546       }
 547     printf ("\n");
 548 }
 549
 550 static void
 551 print_version (void)
 552 {
 553 #ifdef HAVE_VERSION
 554 # include "version.h"
 555 #else
 556     const char *version = NULL;
 557 #endif
 558     const char *version_prefix, *version_string;
 559     const char *c_flags, *ld_flags, *cpp_flags;
 560     struct bytes_size bytes_size;
 561     bool debug;
 562 #ifdef CFLAGS
 563     c_flags = to_str (CFLAGS);
 564 #else
 565     c_flags = "unknown";
 566 #endif
 567 #ifdef LDFLAGS
 568     ld_flags = to_str (LDFLAGS);
 569 #else
 570     ld_flags = "unknown";
 571 #endif
 572 #ifdef CPPFLAGS
 573     cpp_flags = to_str (CPPFLAGS);
 574 #else
 575     cpp_flags = "unknown";
 576 #endif
 577 #if DEBUG
 578     debug = true;
 579 #else
 580     debug = false;
 581 #endif
 582     version_prefix = version ? "" : "v";
 583     version_string = version ? version : VERSION;
 584     printf ("colorize %s%s (compiled at %s, %s)\n", version_prefix, version_string, __DATE__, __TIME__);
 585
 586     printf ("Compiler flags: %s\n", c_flags);
 587     printf ("Linker flags: %s\n", ld_flags);
 588     printf ("Preprocessor flags: %s\n", cpp_flags);
 589     if (get_bytes_size (BUF_SIZE, &bytes_size))
 590       {
 591         if (BUF_SIZE % 1024 == 0)
 592           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 593         else
 594           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 595                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 596       }
 597     else
 598       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 599     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 600     printf ("Debugging: %s\n", debug ? "yes" : "no");
 601 }
 602
 603 static void
 604 cleanup (void)
 605 {
 606     if (stream && fileno (stream) != STDIN_FILENO)
 607       fclose (stream);
 608 #if DEBUG
 609     if (log)
 610       fclose (log);
 611 #endif
 612
 613     if (vars_list)
 614       {
 615         unsigned int i;
 616         for (i = 0; i < stacked_vars; i++)
 617           free (vars_list[i]);
 618         free_null (vars_list);
 619       }
 620 }
 621
 622 static void
 623 free_color_names (struct color_name **color_names)
 624 {
 625     unsigned int i;
 626     for (i = 0; color_names[i]; i++)
 627       {
 628         RELEASE_VAR (color_names[i]->name);
 629         RELEASE_VAR (color_names[i]->orig);
 630         RELEASE_VAR (color_names[i]);
 631       }
 632 }
 633
 634 static void
 635 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream)
 636 {
 637     int ret;
 638     char *p;
 639     struct stat sb;
 640     struct color_name *color_names[3] = { NULL, NULL, NULL };
 641
 642     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 643     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 644
 645     assert (color_string);
 646
 647     if (streq (color_string, "-"))
 648       {
 649         if (file_string)
 650           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 651         else
 652           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 653       }
 654
 655     ret = lstat (color_string, &sb);
 656
 657     /* Ensure that we don't fail if there's a file with one or more
 658        color names in its path.  */
 659     if (ret == 0) /* success */
 660       skip_path_colors (color_string, file_string, &sb);
 661
 662     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 663       {
 664         if (p == color_string)
 665           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
 666         else if (p == color_string + strlen (color_string) - 1)
 667           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
 668         else if (strchr (++p, COLOR_SEP_CHAR))
 669           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
 670       }
 671
 672     gather_color_names (color_string, attr, color_names);
 673
 674     assert (color_names[FOREGROUND]);
 675
 676     if (color_names[BACKGROUND])
 677       {
 678         unsigned int i;
 679         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 680         for (i = 0; i < 2; i++)
 681           {
 682             const unsigned int color1 = color_sets[i][0];
 683             const unsigned int color2 = color_sets[i][1];
 684             if (CHECK_COLORS_RANDOM (color1, color2))
 685               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 686           }
 687       }
 688
 689     find_color_entries (color_names, colors);
 690     free_color_names (color_names);
 691
 692     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 693       {
 694         struct color_name color_name;
 695         color_name.name = color_name.orig = "default";
 696
 697         find_color_entry (&color_name, FOREGROUND, colors);
 698       }
 699
 700     process_file_arg (file_string, file, stream);
 701 }
 702
 703 static void
 704 process_file_arg (const char *file_string, const char **file, FILE **stream)
 705 {
 706     if (file_string)
 707       {
 708         if (streq (file_string, "-"))
 709           *stream = stdin;
 710         else
 711           {
 712             const char *file = file_string;
 713             struct stat sb;
 714             int ret;
 715
 716             errno = 0;
 717             ret = stat (file, &sb);
 718
 719             if (ret == -1)
 720               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 721
 722             if (!VALID_FILE_TYPE (sb.st_mode))
 723               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
 724
 725             *stream = open_file (file, "r");
 726           }
 727         *file = file_string;
 728       }
 729     else
 730       {
 731         *stream = stdin;
 732         *file = "stdin";
 733       }
 734
 735     assert (*stream);
 736     assert (*file);
 737 }
 738
 739 static void
 740 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb)
 741 {
 742     bool have_file;
 743     unsigned int c;
 744     const char *color = color_string;
 745     const mode_t mode = sb->st_mode;
 746
 747     for (c = 1; c <= 2 && *color; c++)
 748       {
 749         bool matched = false;
 750         unsigned int i;
 751         for (i = 0; i < tables[GENERIC].count; i++)
 752           {
 753             const struct color *entry = &tables[GENERIC].entries[i];
 754             if (has_color_name (color, entry->name))
 755               {
 756                 color += strlen (entry->name);
 757                 matched = true;
 758                 break;
 759               }
 760           }
 761         if (!matched && has_color_name (color, "random"))
 762           {
 763             color += strlen ("random");
 764             matched = true;
 765           }
 766         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 767           color++;
 768         else
 769           break;
 770       }
 771
 772     have_file = (*color != '\0');
 773
 774     if (have_file)
 775       {
 776         const char *file_existing = color_string;
 777         if (file_string)
 778           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "cannot be used as color string");
 779         else
 780           {
 781             if (VALID_FILE_TYPE (mode))
 782               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "must be preceded by color string");
 783             else
 784               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "is not a valid file type");
 785           }
 786       }
 787 }
 788
 789 static void
 790 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
 791 {
 792     unsigned int index;
 793     char *color, *p, *str;
 794
 795     str = xstrdup (color_string);
 796     STACK_VAR (str);
 797
 798     for (index = 0, color = str; *color; index++, color = p)
 799       {
 800         char *ch, *sep;
 801
 802         p = NULL;
 803         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 804           {
 805             *sep = '\0';
 806             p = sep + 1;
 807           }
 808         else
 809           p = color + strlen (color);
 810         assert (p);
 811
 812         for (ch = color; *ch; ch++)
 813           if (!isalpha (*ch))
 814             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 815
 816         for (ch = color + 1; *ch; ch++)
 817           if (!islower (*ch))
 818             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 819
 820         if (streq (color, "None"))
 821           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 822
 823         if (isupper (*color))
 824           {
 825             switch (index)
 826               {
 827                 case FOREGROUND:
 828                   snprintf (attr + strlen (attr), 3, "1;");
 829                   break;
 830                 case BACKGROUND:
 831                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 832                 default: /* never reached */
 833                   ABORT_TRACE ();
 834               }
 835           }
 836
 837         color_names[index] = xcalloc (1, sizeof (struct color_name));
 838         STACK_VAR (color_names[index]);
 839
 840         color_names[index]->orig = xstrdup (color);
 841         STACK_VAR (color_names[index]->orig);
 842
 843         for (ch = color; *ch; ch++)
 844           *ch = tolower (*ch);
 845
 846         color_names[index]->name = xstrdup (color);
 847         STACK_VAR (color_names[index]->name);
 848       }
 849
 850     RELEASE_VAR (str);
 851 }
 852
 853 static void
 854 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
 855 {
 856     char buf[BUF_SIZE + 1];
 857     unsigned int flags = 0;
 858
 859     while (!feof (stream))
 860       {
 861         size_t bytes_read;
 862         char *eol;
 863         const char *line;
 864         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 865         if (bytes_read != BUF_SIZE && ferror (stream))
 866           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 867         buf[bytes_read] = '\0';
 868         line = buf;
 869         while ((eol = strpbrk (line, "\n\r")))
 870           {
 871             const char *p;
 872             flags &= ~(CR|LF);
 873             if (*eol == '\r')
 874               {
 875                 flags |= CR;
 876                 if (*(eol + 1) == '\n')
 877                   flags |= LF;
 878               }
 879             else if (*eol == '\n')
 880               flags |= LF;
 881             else
 882               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 883             p = eol + SKIP_LINE_ENDINGS (flags);
 884             *eol = '\0';
 885             print_line (attr, colors, line, flags);
 886             line = p;
 887           }
 888         if (feof (stream))
 889           {
 890             if (*line != '\0')
 891               print_line (attr, colors, line, 0);
 892           }
 893         else if (*line != '\0')
 894           {
 895             char *p;
 896             if ((clean || clean_all) && (p = strrchr (line, '\033')))
 897               merge_print_line (line, p, stream);
 898             else
 899               print_line (attr, colors, line, 0);
 900           }
 901       }
 902 }
 903
 904 static void
 905 merge_print_line (const char *line, const char *p, FILE *stream)
 906 {
 907     char *buf = NULL;
 908     char *merged_esc = NULL;
 909     const char *esc = "";
 910     const char char_restore = *p;
 911
 912     complete_part_line (p + 1, &buf, stream);
 913
 914     if (buf)
 915       {
 916         /* form escape sequence */
 917         esc = merged_esc = str_concat (p, buf);
 918         /* shorten partial line accordingly */
 919         *(char *)p = '\0';
 920         free (buf);
 921       }
 922
 923 #ifdef TEST_MERGE_PART_LINE
 924     printf ("%s%s", line, esc);
 925     fflush (stdout);
 926     _exit (EXIT_SUCCESS);
 927 #else
 928     print_clean (line);
 929     *(char *)p = char_restore;
 930     print_clean (esc);
 931     free (merged_esc);
 932 #endif
 933 }
 934
 935 static void
 936 complete_part_line (const char *p, char **buf, FILE *stream)
 937 {
 938     bool got_next_char = false, read_from_stream;
 939     char ch;
 940     size_t i = 0, size;
 941
 942     if (get_next_char (&ch, &p, stream, &read_from_stream))
 943       {
 944         if (ch == '[')
 945           {
 946             if (read_from_stream)
 947               save_char (ch, buf, &i, &size);
 948           }
 949         else
 950           {
 951             if (read_from_stream)
 952               ungetc ((int)ch, stream);
 953             return; /* cancel */
 954           }
 955       }
 956     else
 957       return; /* cancel */
 958
 959     while (get_next_char (&ch, &p, stream, &read_from_stream))
 960       {
 961         if (isdigit (ch) || ch == ';')
 962           {
 963             if (read_from_stream)
 964               save_char (ch, buf, &i, &size);
 965           }
 966         else /* got next character */
 967           {
 968             got_next_char = true;
 969             break;
 970           }
 971       }
 972
 973     if (got_next_char)
 974       {
 975         if (ch == 'm')
 976           {
 977             if (read_from_stream)
 978               save_char (ch, buf, &i, &size);
 979           }
 980         else
 981           {
 982             if (read_from_stream)
 983               ungetc ((int)ch, stream);
 984             return; /* cancel */
 985           }
 986       }
 987     else
 988       return; /* cancel */
 989 }
 990
 991 static bool
 992 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
 993 {
 994     if (**p == '\0')
 995       {
 996         int c;
 997         if ((c = fgetc (stream)) != EOF)
 998           {
 999             *ch = (char)c;
1000             *read_from_stream = true;
1001             return true;
1002           }
1003         else
1004           {
1005             *read_from_stream = false;
1006             return false;
1007           }
1008       }
1009     else
1010       {
1011         *ch = **p;
1012         (*p)++;
1013         *read_from_stream = false;
1014         return true;
1015       }
1016 }
1017
1018 static void
1019 save_char (char ch, char **buf, size_t *i, size_t *size)
1020 {
1021     if (!*buf)
1022       {
1023         *size = ALLOC_COMPLETE_PART_LINE;
1024         *buf = xmalloc (*size);
1025       }
1026     /* +1: effective occupied size of buffer */
1027     else if ((*i + 1) == *size)
1028       {
1029         *size *= 2;
1030         *buf = xrealloc (*buf, *size);
1031       }
1032     (*buf)[*i] = ch;
1033     (*buf)[*i + 1] = '\0';
1034     (*i)++;
1035 }
1036
1037 static void
1038 find_color_entries (struct color_name **color_names, const struct color **colors)
1039 {
1040     struct timeval tv;
1041     unsigned int index;
1042
1043     /* randomness */
1044     gettimeofday (&tv, NULL);
1045     srand (tv.tv_usec * tv.tv_sec);
1046
1047     for (index = 0; color_names[index]; index++)
1048       {
1049         const char *color_name = color_names[index]->name;
1050
1051         const unsigned int count                = tables[index].count;
1052         const struct color *const color_entries = tables[index].entries;
1053
1054         if (streq (color_name, "random"))
1055           {
1056             bool excludable;
1057             unsigned int i;
1058             do {
1059               excludable = false;
1060               i = rand() % (count - 2) + 1; /* omit color none and default */
1061               switch (index)
1062                 {
1063                   case FOREGROUND:
1064                     /* --exclude-random */
1065                     if (exclude && streq (exclude, color_entries[i].name))
1066                       excludable = true;
1067                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1068                       excludable = true;
1069                     break;
1070                   case BACKGROUND:
1071                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1072                       excludable = true;
1073                     break;
1074                   default: /* never reached */
1075                     ABORT_TRACE ();
1076                  }
1077             } while (excludable);
1078             colors[index] = (struct color *)&color_entries[i];
1079           }
1080         else
1081           find_color_entry (color_names[index], index, colors);
1082       }
1083 }
1084
1085 static void
1086 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1087 {
1088     bool found = false;
1089     unsigned int i;
1090
1091     const unsigned int count                = tables[index].count;
1092     const struct color *const color_entries = tables[index].entries;
1093
1094     for (i = 0; i < count; i++)
1095       if (streq (color_name->name, color_entries[i].name))
1096         {
1097           colors[index] = (struct color *)&color_entries[i];
1098           found = true;
1099           break;
1100         }
1101     if (!found)
1102       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1103 }
1104
1105 static void
1106 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags)
1107 {
1108     /* --clean[-all] */
1109     if (clean || clean_all)
1110       print_clean (line);
1111     else
1112       {
1113         /* Foreground color code is guaranteed to be set when background color code is present.  */
1114         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1115           printf ("\033[%s", colors[BACKGROUND]->code);
1116         if (colors[FOREGROUND]->code)
1117           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1118         else
1119           printf (formats[FMT_GENERIC], line);
1120       }
1121     if (flags & CR)
1122       putchar ('\r');
1123     if (flags & LF)
1124       putchar ('\n');
1125 }
1126
1127 static void
1128 print_clean (const char *line)
1129 {
1130     const char *p = line;
1131
1132     if (is_esc (p))
1133       p = get_end_of_esc (p);
1134
1135     while (*p != '\0')
1136       {
1137         const char *text_start = p;
1138         const char *text_end = get_end_of_text (p);
1139         print_text (text_start, text_end - text_start);
1140         p = get_end_of_esc (text_end);
1141       }
1142 }
1143
1144 static bool
1145 is_esc (const char *p)
1146 {
1147     return gather_esc_offsets (p, NULL, NULL);
1148 }
1149
1150 static const char *
1151 get_end_of_esc (const char *p)
1152 {
1153     const char *esc;
1154     const char *end = NULL;
1155     while ((esc = strchr (p, '\033')))
1156       {
1157         if (gather_esc_offsets (esc, NULL, &end))
1158           break;
1159         p = esc + 1;
1160       }
1161     return end ? end + 1 : p + strlen (p);
1162 }
1163
1164 static const char *
1165 get_end_of_text (const char *p)
1166 {
1167     const char *esc;
1168     const char *start = NULL;
1169     while ((esc = strchr (p, '\033')))
1170       {
1171         if (gather_esc_offsets (esc, &start, NULL))
1172           break;
1173         p = esc + 1;
1174       }
1175     return start ? start : p + strlen (p);
1176 }
1177
1178 static void
1179 print_text (const char *p, size_t len)
1180 {
1181     size_t bytes_written;
1182     bytes_written = fwrite (p, 1, len, stdout);
1183     if (bytes_written != len)
1184       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1185 }
1186
1187 static bool
1188 gather_esc_offsets (const char *p, const char **start, const char **end)
1189 {
1190     /* ESC[ */
1191     if (*p == 27 && *(p + 1) == '[')
1192       {
1193         bool valid = false;
1194         const char *const begin = p;
1195         p += 2;
1196         if (clean_all)
1197           valid = validate_esc_clean_all (&p);
1198         else if (clean)
1199           {
1200             bool check_values;
1201             unsigned int prev_iter, iter;
1202             const char *digit;
1203             prev_iter = iter = 0;
1204             do {
1205               check_values = false;
1206               iter++;
1207               if (!isdigit (*p))
1208                 break;
1209               digit = p;
1210               while (isdigit (*p))
1211                 p++;
1212               if (p - digit > 2)
1213                 break;
1214               else /* check range */
1215                 {
1216                   char val[3];
1217                   int value;
1218                   unsigned int i;
1219                   const unsigned int digits = p - digit;
1220                   for (i = 0; i < digits; i++)
1221                     val[i] = *digit++;
1222                   val[i] = '\0';
1223                   value = atoi (val);
1224                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1225                 }
1226             } while (check_values);
1227           }
1228         if (valid)
1229           {
1230             if (start)
1231               *start = begin;
1232             if (end)
1233               *end = p;
1234             return true;
1235           }
1236       }
1237     return false;
1238 }
1239
1240 static bool
1241 validate_esc_clean_all (const char **p)
1242 {
1243     while (isdigit (**p) || **p == ';')
1244       (*p)++;
1245     return (**p == 'm');
1246 }
1247
1248 static bool
1249 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1250 {
1251     if (is_reset (value, iter, p))
1252       return true;
1253     else if (is_attr (value, iter, *prev_iter, p))
1254       {
1255         (*p)++;
1256         *check_values = true;
1257         *prev_iter = iter;
1258         return false; /* partial escape sequence, need another valid value */
1259       }
1260     else if (is_fg_color (value, p))
1261       return true;
1262     else if (is_bg_color (value, iter, p))
1263       return true;
1264     else
1265       return false;
1266 }
1267
1268 static bool
1269 is_reset (int value, unsigned int iter, const char **p)
1270 {
1271     return (value == 0 && iter == 1 && **p == 'm');
1272 }
1273
1274 static bool
1275 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1276 {
1277     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1278 }
1279
1280 static bool
1281 is_fg_color (int value, const char **p)
1282 {
1283     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1284 }
1285
1286 static bool
1287 is_bg_color (int value, unsigned int iter, const char **p)
1288 {
1289     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1290 }
1291
1292 #if !DEBUG
1293 static void *
1294 malloc_wrap (size_t size)
1295 {
1296     void *p = malloc (size);
1297     if (!p)
1298       MEM_ALLOC_FAIL ();
1299     return p;
1300 }
1301
1302 static void *
1303 calloc_wrap (size_t nmemb, size_t size)
1304 {
1305     void *p = calloc (nmemb, size);
1306     if (!p)
1307       MEM_ALLOC_FAIL ();
1308     return p;
1309 }
1310
1311 static void *
1312 realloc_wrap (void *ptr, size_t size)
1313 {
1314     void *p = realloc (ptr, size);
1315     if (!p)
1316       MEM_ALLOC_FAIL ();
1317     return p;
1318 }
1319 #else
1320 static void *
1321 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1322 {
1323     void *p = malloc (size);
1324     if (!p)
1325       MEM_ALLOC_FAIL_DEBUG (file, line);
1326     fprintf (log, "%s: malloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1327     return p;
1328 }
1329
1330 static void *
1331 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1332 {
1333     void *p = calloc (nmemb, size);
1334     if (!p)
1335       MEM_ALLOC_FAIL_DEBUG (file, line);
1336     fprintf (log, "%s: calloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)(nmemb * size), file, line);
1337     return p;
1338 }
1339
1340 static void *
1341 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1342 {
1343     void *p = realloc (ptr, size);
1344     if (!p)
1345       MEM_ALLOC_FAIL_DEBUG (file, line);
1346     fprintf (log, "%s: realloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1347     return p;
1348 }
1349 #endif /* !DEBUG */
1350
1351 static void
1352 free_wrap (void **ptr)
1353 {
1354     free (*ptr);
1355     *ptr = NULL;
1356 }
1357
1358 #if !DEBUG
1359 # define do_malloc(len, file, line) malloc_wrap(len)
1360 #else
1361 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1362 #endif
1363
1364 static char *
1365 strdup_wrap (const char *str, const char *file, unsigned int line)
1366 {
1367     const size_t len = strlen (str) + 1;
1368     char *p = do_malloc (len, file, line);
1369     strncpy (p, str, len);
1370     return p;
1371 }
1372
1373 static char *
1374 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1375 {
1376     const size_t len = strlen (str1) + strlen (str2) + 1;
1377     char *p, *str;
1378
1379     p = str = do_malloc (len, file, line);
1380     strncpy (p, str1, strlen (str1));
1381     p += strlen (str1);
1382     strncpy (p, str2, strlen (str2));
1383     p += strlen (str2);
1384     *p = '\0';
1385
1386     return str;
1387 }
1388
1389 static bool
1390 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1391 {
1392     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1393     unsigned long size = bytes;
1394     if (bytes < 1024)
1395       return false;
1396     unit = units;
1397     while (size >= 1024 && *(unit + 1))
1398       {
1399         size /= 1024;
1400         unit++;
1401       }
1402     bytes_size->size = (unsigned int)size;
1403     bytes_size->unit = *unit;
1404     return true;
1405 }
1406
1407 static char *
1408 get_file_type (mode_t mode)
1409 {
1410     if (S_ISREG (mode))
1411       return "file";
1412     else if (S_ISDIR (mode))
1413       return "directory";
1414     else if (S_ISCHR (mode))
1415       return "character device";
1416     else if (S_ISBLK (mode))
1417       return "block device";
1418     else if (S_ISFIFO (mode))
1419       return "named pipe";
1420     else if (S_ISLNK (mode))
1421       return "symbolic link";
1422     else if (S_ISSOCK (mode))
1423       return "socket";
1424     else
1425       return "file";
1426 }
1427
1428 static bool
1429 has_color_name (const char *str, const char *name)
1430 {
1431     char *p;
1432
1433     assert (strlen (str));
1434     assert (strlen (name));
1435
1436     if (!(*str == *name || *str == toupper (*name)))
1437       return false;
1438     else if (*(name + 1) != '\0'
1439      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1440       return false;
1441
1442     return true;
1443 }
1444
1445 static FILE *
1446 open_file (const char *file, const char *mode)
1447 {
1448     FILE *stream;
1449
1450     errno = 0;
1451     stream = fopen (file, mode);
1452     if (!stream)
1453       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1454
1455     return stream;
1456 }
1457
1458 #define DO_VFPRINTF(fmt)                    \
1459     va_list ap;                             \
1460     fprintf (stderr, "%s: ", program_name); \
1461     va_start (ap, fmt);                     \
1462     vfprintf (stderr, fmt, ap);             \
1463     va_end (ap);                            \
1464     fprintf (stderr, "\n");                 \
1465
1466 static void
1467 vfprintf_diag (const char *fmt, ...)
1468 {
1469     DO_VFPRINTF (fmt);
1470 }
1471
1472 static void
1473 vfprintf_fail (const char *fmt, ...)
1474 {
1475     DO_VFPRINTF (fmt);
1476     exit (EXIT_FAILURE);
1477 }
1478
1479 static void
1480 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1481 {
1482     /* nothing to stack */
1483     if (ptr == NULL)
1484       return;
1485     if (!*list)
1486       *list = xmalloc (sizeof (void *));
1487     else
1488       {
1489         unsigned int i;
1490         for (i = 0; i < *stacked; i++)
1491           if (!(*list)[i])
1492             {
1493               (*list)[i] = ptr;
1494               return; /* reused */
1495             }
1496         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1497       }
1498     (*list)[index] = ptr;
1499     (*stacked)++;
1500 }
1501
1502 static void
1503 release_var (void **list, unsigned int stacked, void **ptr)
1504 {
1505     unsigned int i;
1506     /* nothing to release */
1507     if (*ptr == NULL)
1508       return;
1509     for (i = 0; i < stacked; i++)
1510       if (list[i] == *ptr)
1511         {
1512           free (*ptr);
1513           *ptr = NULL;
1514           list[i] = NULL;
1515           return;
1516         }
1517 }