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               {
 472                 char *sep;
 473                 char *attr_invalid = xstrdup (s);
 474                 STACK_VAR (attr_invalid);
 475                 if ((sep = strchr (attr_invalid, ',')))
 476                   *sep = '\0';
 477                 vfprintf_fail ("--attr switch attribute '%s' is not valid", attr_invalid);
 478               }
 479           }
 480         if (*p)
 481           p++;
 482       }
 483 }
 484
 485 static void
 486 write_attr (const struct attr *attr_i, unsigned int *attr_types)
 487 {
 488     const unsigned int val = attr_i->val;
 489     const enum attr_type attr_type = attr_i->type;
 490     const char *attr_name = attr_i->name;
 491
 492     if (*attr_types & attr_type)
 493       vfprintf_fail ("--attr switch has attribute '%s' twice or more", attr_name);
 494     snprintf (attr + strlen (attr), 3, "%u;", val);
 495     *attr_types |= attr_type;
 496 }
 497
 498 static void
 499 print_hint (void)
 500 {
 501     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 502 }
 503
 504 static void
 505 print_help (void)
 506 {
 507     struct short_opt {
 508         const char *name;
 509         const char *short_opt;
 510     };
 511     const struct short_opt short_opts[] = {
 512         { "help",    "h" },
 513         { "version", "V" },
 514     };
 515     const struct option *opt = long_opts;
 516     unsigned int i;
 517
 518     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 519     printf ("\tColors (foreground) (background)\n");
 520     for (i = 0; i < tables[FOREGROUND].count; i++)
 521       {
 522         const struct color *entry = &tables[FOREGROUND].entries[i];
 523         const char *name = entry->name;
 524         const char *code = entry->code;
 525         if (code)
 526           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 527                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 528         else
 529           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 530       }
 531     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 532
 533     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 534     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 535
 536     printf ("\n\tOptions\n");
 537     for (; opt->name; opt++)
 538       {
 539         const char *short_opt = NULL;
 540         unsigned int i;
 541         for (i = 0; i < sizeof (short_opts) / sizeof (struct short_opt); i++)
 542           {
 543             if (streq (opt->name, short_opts[i].name))
 544               {
 545                 short_opt = short_opts[i].short_opt;
 546                 break;
 547               }
 548           }
 549         if (short_opt)
 550           printf ("\t\t-%s, --%s\n", short_opt, opt->name);
 551         else
 552           printf ("\t\t    --%s\n", opt->name);
 553       }
 554     printf ("\n");
 555 }
 556
 557 static void
 558 print_version (void)
 559 {
 560 #ifdef HAVE_VERSION
 561 # include "version.h"
 562 #else
 563     const char *version = NULL;
 564 #endif
 565     const char *version_prefix, *version_string;
 566     const char *c_flags, *ld_flags, *cpp_flags;
 567     const char *const desc_flags_unknown = "unknown";
 568     struct bytes_size bytes_size;
 569     bool debug;
 570 #ifdef CFLAGS
 571     c_flags = to_str (CFLAGS);
 572 #else
 573     c_flags = desc_flags_unknown;
 574 #endif
 575 #ifdef LDFLAGS
 576     ld_flags = to_str (LDFLAGS);
 577 #else
 578     ld_flags = desc_flags_unknown;
 579 #endif
 580 #ifdef CPPFLAGS
 581     cpp_flags = to_str (CPPFLAGS);
 582 #else
 583     cpp_flags = desc_flags_unknown;
 584 #endif
 585 #if DEBUG
 586     debug = true;
 587 #else
 588     debug = false;
 589 #endif
 590     version_prefix = version ? "" : "v";
 591     version_string = version ? version : VERSION;
 592     printf ("colorize %s%s (compiled at %s, %s)\n", version_prefix, version_string, __DATE__, __TIME__);
 593
 594     printf ("Compiler flags: %s\n", c_flags);
 595     printf ("Linker flags: %s\n", ld_flags);
 596     printf ("Preprocessor flags: %s\n", cpp_flags);
 597     if (get_bytes_size (BUF_SIZE, &bytes_size))
 598       {
 599         if (BUF_SIZE % 1024 == 0)
 600           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 601         else
 602           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 603                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 604       }
 605     else
 606       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 607     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 608     printf ("Debugging: %s\n", debug ? "yes" : "no");
 609 }
 610
 611 static void
 612 cleanup (void)
 613 {
 614     if (stream && fileno (stream) != STDIN_FILENO)
 615       fclose (stream);
 616 #if DEBUG
 617     if (log)
 618       fclose (log);
 619 #endif
 620
 621     if (vars_list)
 622       {
 623         unsigned int i;
 624         for (i = 0; i < stacked_vars; i++)
 625           free (vars_list[i]);
 626         free_null (vars_list);
 627       }
 628 }
 629
 630 static void
 631 free_color_names (struct color_name **color_names)
 632 {
 633     unsigned int i;
 634     for (i = 0; color_names[i]; i++)
 635       {
 636         RELEASE_VAR (color_names[i]->name);
 637         RELEASE_VAR (color_names[i]->orig);
 638         RELEASE_VAR (color_names[i]);
 639       }
 640 }
 641
 642 static void
 643 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream)
 644 {
 645     int ret;
 646     char *p;
 647     struct stat sb;
 648     struct color_name *color_names[3] = { NULL, NULL, NULL };
 649
 650     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 651     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 652
 653     assert (color_string);
 654
 655     if (streq (color_string, "-"))
 656       {
 657         if (file_string)
 658           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 659         else
 660           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 661       }
 662
 663     ret = lstat (color_string, &sb);
 664
 665     /* Ensure that we don't fail if there's a file with one or more
 666        color names in its path.  */
 667     if (ret == 0) /* success */
 668       skip_path_colors (color_string, file_string, &sb);
 669
 670     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 671       {
 672         if (p == color_string)
 673           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
 674         else if (p == color_string + strlen (color_string) - 1)
 675           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
 676         else if (strchr (++p, COLOR_SEP_CHAR))
 677           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
 678       }
 679
 680     gather_color_names (color_string, attr, color_names);
 681
 682     assert (color_names[FOREGROUND]);
 683
 684     if (color_names[BACKGROUND])
 685       {
 686         unsigned int i;
 687         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 688         for (i = 0; i < 2; i++)
 689           {
 690             const unsigned int color1 = color_sets[i][0];
 691             const unsigned int color2 = color_sets[i][1];
 692             if (CHECK_COLORS_RANDOM (color1, color2))
 693               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 694           }
 695       }
 696
 697     find_color_entries (color_names, colors);
 698     free_color_names (color_names);
 699
 700     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 701       {
 702         struct color_name color_name;
 703         color_name.name = color_name.orig = "default";
 704
 705         find_color_entry (&color_name, FOREGROUND, colors);
 706       }
 707
 708     process_file_arg (file_string, file, stream);
 709 }
 710
 711 static void
 712 process_file_arg (const char *file_string, const char **file, FILE **stream)
 713 {
 714     if (file_string)
 715       {
 716         if (streq (file_string, "-"))
 717           *stream = stdin;
 718         else
 719           {
 720             const char *file = file_string;
 721             struct stat sb;
 722             int ret;
 723
 724             errno = 0;
 725             ret = stat (file, &sb);
 726
 727             if (ret == -1)
 728               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 729
 730             if (!VALID_FILE_TYPE (sb.st_mode))
 731               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
 732
 733             *stream = open_file (file, "r");
 734           }
 735         *file = file_string;
 736       }
 737     else
 738       {
 739         *stream = stdin;
 740         *file = "stdin";
 741       }
 742
 743     assert (*stream);
 744     assert (*file);
 745 }
 746
 747 static void
 748 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb)
 749 {
 750     bool have_file;
 751     unsigned int c;
 752     const char *color = color_string;
 753     const mode_t mode = sb->st_mode;
 754
 755     for (c = 1; c <= 2 && *color; c++)
 756       {
 757         bool matched = false;
 758         unsigned int i;
 759         for (i = 0; i < tables[GENERIC].count; i++)
 760           {
 761             const struct color *entry = &tables[GENERIC].entries[i];
 762             if (has_color_name (color, entry->name))
 763               {
 764                 color += strlen (entry->name);
 765                 matched = true;
 766                 break;
 767               }
 768           }
 769         if (!matched && has_color_name (color, "random"))
 770           {
 771             color += strlen ("random");
 772             matched = true;
 773           }
 774         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 775           color++;
 776         else
 777           break;
 778       }
 779
 780     have_file = (*color != '\0');
 781
 782     if (have_file)
 783       {
 784         const char *file_existing = color_string;
 785         if (file_string)
 786           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "cannot be used as color string");
 787         else
 788           {
 789             if (VALID_FILE_TYPE (mode))
 790               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "must be preceded by color string");
 791             else
 792               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "is not a valid file type");
 793           }
 794       }
 795 }
 796
 797 static void
 798 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
 799 {
 800     unsigned int index;
 801     char *color, *p, *str;
 802
 803     str = xstrdup (color_string);
 804     STACK_VAR (str);
 805
 806     for (index = 0, color = str; *color; index++, color = p)
 807       {
 808         char *ch, *sep;
 809
 810         p = NULL;
 811         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 812           {
 813             *sep = '\0';
 814             p = sep + 1;
 815           }
 816         else
 817           p = color + strlen (color);
 818         assert (p);
 819
 820         for (ch = color; *ch; ch++)
 821           if (!isalpha (*ch))
 822             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 823
 824         for (ch = color + 1; *ch; ch++)
 825           if (!islower (*ch))
 826             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 827
 828         if (streq (color, "None"))
 829           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 830
 831         if (isupper (*color))
 832           {
 833             switch (index)
 834               {
 835                 case FOREGROUND:
 836                   snprintf (attr + strlen (attr), 3, "1;");
 837                   break;
 838                 case BACKGROUND:
 839                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 840                 default: /* never reached */
 841                   ABORT_TRACE ();
 842               }
 843           }
 844
 845         color_names[index] = xcalloc (1, sizeof (struct color_name));
 846         STACK_VAR (color_names[index]);
 847
 848         color_names[index]->orig = xstrdup (color);
 849         STACK_VAR (color_names[index]->orig);
 850
 851         for (ch = color; *ch; ch++)
 852           *ch = tolower (*ch);
 853
 854         color_names[index]->name = xstrdup (color);
 855         STACK_VAR (color_names[index]->name);
 856       }
 857
 858     RELEASE_VAR (str);
 859 }
 860
 861 static void
 862 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
 863 {
 864     char buf[BUF_SIZE + 1];
 865     unsigned int flags = 0;
 866
 867     while (!feof (stream))
 868       {
 869         size_t bytes_read;
 870         char *eol;
 871         const char *line;
 872         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 873         if (bytes_read != BUF_SIZE && ferror (stream))
 874           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 875         buf[bytes_read] = '\0';
 876         line = buf;
 877         while ((eol = strpbrk (line, "\n\r")))
 878           {
 879             const char *p;
 880             flags &= ~(CR|LF);
 881             if (*eol == '\r')
 882               {
 883                 flags |= CR;
 884                 if (*(eol + 1) == '\n')
 885                   flags |= LF;
 886               }
 887             else if (*eol == '\n')
 888               flags |= LF;
 889             else
 890               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 891             p = eol + SKIP_LINE_ENDINGS (flags);
 892             *eol = '\0';
 893             print_line (attr, colors, line, flags);
 894             line = p;
 895           }
 896         if (feof (stream))
 897           {
 898             if (*line != '\0')
 899               print_line (attr, colors, line, 0);
 900           }
 901         else if (*line != '\0')
 902           {
 903             char *p;
 904             if ((clean || clean_all) && (p = strrchr (line, '\033')))
 905               merge_print_line (line, p, stream);
 906             else
 907               print_line (attr, colors, line, 0);
 908           }
 909       }
 910 }
 911
 912 static void
 913 merge_print_line (const char *line, const char *p, FILE *stream)
 914 {
 915     char *buf = NULL;
 916     char *merged_esc = NULL;
 917     const char *esc = "";
 918     const char char_restore = *p;
 919
 920     complete_part_line (p + 1, &buf, stream);
 921
 922     if (buf)
 923       {
 924         /* form escape sequence */
 925         esc = merged_esc = str_concat (p, buf);
 926         /* shorten partial line accordingly */
 927         *(char *)p = '\0';
 928         free (buf);
 929       }
 930
 931 #ifdef TEST_MERGE_PART_LINE
 932     printf ("%s%s", line, esc);
 933     fflush (stdout);
 934     _exit (EXIT_SUCCESS);
 935 #else
 936     print_clean (line);
 937     *(char *)p = char_restore;
 938     print_clean (esc);
 939     free (merged_esc);
 940 #endif
 941 }
 942
 943 static void
 944 complete_part_line (const char *p, char **buf, FILE *stream)
 945 {
 946     bool got_next_char = false, read_from_stream;
 947     char ch;
 948     size_t i = 0, size;
 949
 950     if (get_next_char (&ch, &p, stream, &read_from_stream))
 951       {
 952         if (ch == '[')
 953           {
 954             if (read_from_stream)
 955               save_char (ch, buf, &i, &size);
 956           }
 957         else
 958           {
 959             if (read_from_stream)
 960               ungetc ((int)ch, stream);
 961             return; /* cancel */
 962           }
 963       }
 964     else
 965       return; /* cancel */
 966
 967     while (get_next_char (&ch, &p, stream, &read_from_stream))
 968       {
 969         if (isdigit (ch) || ch == ';')
 970           {
 971             if (read_from_stream)
 972               save_char (ch, buf, &i, &size);
 973           }
 974         else /* got next character */
 975           {
 976             got_next_char = true;
 977             break;
 978           }
 979       }
 980
 981     if (got_next_char)
 982       {
 983         if (ch == 'm')
 984           {
 985             if (read_from_stream)
 986               save_char (ch, buf, &i, &size);
 987           }
 988         else
 989           {
 990             if (read_from_stream)
 991               ungetc ((int)ch, stream);
 992             return; /* cancel */
 993           }
 994       }
 995     else
 996       return; /* cancel */
 997 }
 998
 999 static bool
1000 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
1001 {
1002     if (**p == '\0')
1003       {
1004         int c;
1005         if ((c = fgetc (stream)) != EOF)
1006           {
1007             *ch = (char)c;
1008             *read_from_stream = true;
1009             return true;
1010           }
1011         else
1012           {
1013             *read_from_stream = false;
1014             return false;
1015           }
1016       }
1017     else
1018       {
1019         *ch = **p;
1020         (*p)++;
1021         *read_from_stream = false;
1022         return true;
1023       }
1024 }
1025
1026 static void
1027 save_char (char ch, char **buf, size_t *i, size_t *size)
1028 {
1029     if (!*buf)
1030       {
1031         *size = ALLOC_COMPLETE_PART_LINE;
1032         *buf = xmalloc (*size);
1033       }
1034     /* +1: effective occupied size of buffer */
1035     else if ((*i + 1) == *size)
1036       {
1037         *size *= 2;
1038         *buf = xrealloc (*buf, *size);
1039       }
1040     (*buf)[*i] = ch;
1041     (*buf)[*i + 1] = '\0';
1042     (*i)++;
1043 }
1044
1045 static void
1046 find_color_entries (struct color_name **color_names, const struct color **colors)
1047 {
1048     struct timeval tv;
1049     unsigned int index;
1050
1051     /* randomness */
1052     gettimeofday (&tv, NULL);
1053     srand (tv.tv_usec * tv.tv_sec);
1054
1055     for (index = 0; color_names[index]; index++)
1056       {
1057         const char *color_name = color_names[index]->name;
1058
1059         const unsigned int count                = tables[index].count;
1060         const struct color *const color_entries = tables[index].entries;
1061
1062         if (streq (color_name, "random"))
1063           {
1064             bool excludable;
1065             unsigned int i;
1066             do {
1067               excludable = false;
1068               i = rand() % (count - 2) + 1; /* omit color none and default */
1069               switch (index)
1070                 {
1071                   case FOREGROUND:
1072                     /* --exclude-random */
1073                     if (exclude && streq (exclude, color_entries[i].name))
1074                       excludable = true;
1075                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1076                       excludable = true;
1077                     break;
1078                   case BACKGROUND:
1079                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1080                       excludable = true;
1081                     break;
1082                   default: /* never reached */
1083                     ABORT_TRACE ();
1084                  }
1085             } while (excludable);
1086             colors[index] = (struct color *)&color_entries[i];
1087           }
1088         else
1089           find_color_entry (color_names[index], index, colors);
1090       }
1091 }
1092
1093 static void
1094 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1095 {
1096     bool found = false;
1097     unsigned int i;
1098
1099     const unsigned int count                = tables[index].count;
1100     const struct color *const color_entries = tables[index].entries;
1101
1102     for (i = 0; i < count; i++)
1103       if (streq (color_name->name, color_entries[i].name))
1104         {
1105           colors[index] = (struct color *)&color_entries[i];
1106           found = true;
1107           break;
1108         }
1109     if (!found)
1110       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1111 }
1112
1113 static void
1114 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags)
1115 {
1116     /* --clean[-all] */
1117     if (clean || clean_all)
1118       print_clean (line);
1119     else
1120       {
1121         /* Foreground color code is guaranteed to be set when background color code is present.  */
1122         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1123           printf ("\033[%s", colors[BACKGROUND]->code);
1124         if (colors[FOREGROUND]->code)
1125           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1126         else
1127           printf (formats[FMT_GENERIC], line);
1128       }
1129     if (flags & CR)
1130       putchar ('\r');
1131     if (flags & LF)
1132       putchar ('\n');
1133 }
1134
1135 static void
1136 print_clean (const char *line)
1137 {
1138     const char *p = line;
1139
1140     if (is_esc (p))
1141       p = get_end_of_esc (p);
1142
1143     while (*p != '\0')
1144       {
1145         const char *text_start = p;
1146         const char *text_end = get_end_of_text (p);
1147         print_text (text_start, text_end - text_start);
1148         p = get_end_of_esc (text_end);
1149       }
1150 }
1151
1152 static bool
1153 is_esc (const char *p)
1154 {
1155     return gather_esc_offsets (p, NULL, NULL);
1156 }
1157
1158 static const char *
1159 get_end_of_esc (const char *p)
1160 {
1161     const char *esc;
1162     const char *end = NULL;
1163     while ((esc = strchr (p, '\033')))
1164       {
1165         if (gather_esc_offsets (esc, NULL, &end))
1166           break;
1167         p = esc + 1;
1168       }
1169     return end ? end + 1 : p + strlen (p);
1170 }
1171
1172 static const char *
1173 get_end_of_text (const char *p)
1174 {
1175     const char *esc;
1176     const char *start = NULL;
1177     while ((esc = strchr (p, '\033')))
1178       {
1179         if (gather_esc_offsets (esc, &start, NULL))
1180           break;
1181         p = esc + 1;
1182       }
1183     return start ? start : p + strlen (p);
1184 }
1185
1186 static void
1187 print_text (const char *p, size_t len)
1188 {
1189     size_t bytes_written;
1190     bytes_written = fwrite (p, 1, len, stdout);
1191     if (bytes_written != len)
1192       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1193 }
1194
1195 static bool
1196 gather_esc_offsets (const char *p, const char **start, const char **end)
1197 {
1198     /* ESC[ */
1199     if (*p == 27 && *(p + 1) == '[')
1200       {
1201         bool valid = false;
1202         const char *const begin = p;
1203         p += 2;
1204         if (clean_all)
1205           valid = validate_esc_clean_all (&p);
1206         else if (clean)
1207           {
1208             bool check_values;
1209             unsigned int prev_iter, iter;
1210             const char *digit;
1211             prev_iter = iter = 0;
1212             do {
1213               check_values = false;
1214               iter++;
1215               if (!isdigit (*p))
1216                 break;
1217               digit = p;
1218               while (isdigit (*p))
1219                 p++;
1220               if (p - digit > 2)
1221                 break;
1222               else /* check range */
1223                 {
1224                   char val[3];
1225                   int value;
1226                   unsigned int i;
1227                   const unsigned int digits = p - digit;
1228                   for (i = 0; i < digits; i++)
1229                     val[i] = *digit++;
1230                   val[i] = '\0';
1231                   value = atoi (val);
1232                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1233                 }
1234             } while (check_values);
1235           }
1236         if (valid)
1237           {
1238             if (start)
1239               *start = begin;
1240             if (end)
1241               *end = p;
1242             return true;
1243           }
1244       }
1245     return false;
1246 }
1247
1248 static bool
1249 validate_esc_clean_all (const char **p)
1250 {
1251     while (isdigit (**p) || **p == ';')
1252       (*p)++;
1253     return (**p == 'm');
1254 }
1255
1256 static bool
1257 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1258 {
1259     if (is_reset (value, iter, p))
1260       return true;
1261     else if (is_attr (value, iter, *prev_iter, p))
1262       {
1263         (*p)++;
1264         *check_values = true;
1265         *prev_iter = iter;
1266         return false; /* partial escape sequence, need another valid value */
1267       }
1268     else if (is_fg_color (value, p))
1269       return true;
1270     else if (is_bg_color (value, iter, p))
1271       return true;
1272     else
1273       return false;
1274 }
1275
1276 static bool
1277 is_reset (int value, unsigned int iter, const char **p)
1278 {
1279     return (value == 0 && iter == 1 && **p == 'm');
1280 }
1281
1282 static bool
1283 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1284 {
1285     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1286 }
1287
1288 static bool
1289 is_fg_color (int value, const char **p)
1290 {
1291     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1292 }
1293
1294 static bool
1295 is_bg_color (int value, unsigned int iter, const char **p)
1296 {
1297     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1298 }
1299
1300 #if !DEBUG
1301 static void *
1302 malloc_wrap (size_t size)
1303 {
1304     void *p = malloc (size);
1305     if (!p)
1306       MEM_ALLOC_FAIL ();
1307     return p;
1308 }
1309
1310 static void *
1311 calloc_wrap (size_t nmemb, size_t size)
1312 {
1313     void *p = calloc (nmemb, size);
1314     if (!p)
1315       MEM_ALLOC_FAIL ();
1316     return p;
1317 }
1318
1319 static void *
1320 realloc_wrap (void *ptr, size_t size)
1321 {
1322     void *p = realloc (ptr, size);
1323     if (!p)
1324       MEM_ALLOC_FAIL ();
1325     return p;
1326 }
1327 #else
1328 static void *
1329 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1330 {
1331     void *p = malloc (size);
1332     if (!p)
1333       MEM_ALLOC_FAIL_DEBUG (file, line);
1334     fprintf (log, "%s: malloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1335     return p;
1336 }
1337
1338 static void *
1339 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1340 {
1341     void *p = calloc (nmemb, size);
1342     if (!p)
1343       MEM_ALLOC_FAIL_DEBUG (file, line);
1344     fprintf (log, "%s: calloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)(nmemb * size), file, line);
1345     return p;
1346 }
1347
1348 static void *
1349 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1350 {
1351     void *p = realloc (ptr, size);
1352     if (!p)
1353       MEM_ALLOC_FAIL_DEBUG (file, line);
1354     fprintf (log, "%s: realloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1355     return p;
1356 }
1357 #endif /* !DEBUG */
1358
1359 static void
1360 free_wrap (void **ptr)
1361 {
1362     free (*ptr);
1363     *ptr = NULL;
1364 }
1365
1366 #if !DEBUG
1367 # define do_malloc(len, file, line) malloc_wrap(len)
1368 #else
1369 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1370 #endif
1371
1372 static char *
1373 strdup_wrap (const char *str, const char *file, unsigned int line)
1374 {
1375     const size_t len = strlen (str) + 1;
1376     char *p = do_malloc (len, file, line);
1377     strncpy (p, str, len);
1378     return p;
1379 }
1380
1381 static char *
1382 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1383 {
1384     const size_t len = strlen (str1) + strlen (str2) + 1;
1385     char *p, *str;
1386
1387     p = str = do_malloc (len, file, line);
1388     strncpy (p, str1, strlen (str1));
1389     p += strlen (str1);
1390     strncpy (p, str2, strlen (str2));
1391     p += strlen (str2);
1392     *p = '\0';
1393
1394     return str;
1395 }
1396
1397 static bool
1398 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1399 {
1400     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1401     unsigned long size = bytes;
1402     if (bytes < 1024)
1403       return false;
1404     unit = units;
1405     while (size >= 1024 && *(unit + 1))
1406       {
1407         size /= 1024;
1408         unit++;
1409       }
1410     bytes_size->size = (unsigned int)size;
1411     bytes_size->unit = *unit;
1412     return true;
1413 }
1414
1415 static char *
1416 get_file_type (mode_t mode)
1417 {
1418     if (S_ISREG (mode))
1419       return "file";
1420     else if (S_ISDIR (mode))
1421       return "directory";
1422     else if (S_ISCHR (mode))
1423       return "character device";
1424     else if (S_ISBLK (mode))
1425       return "block device";
1426     else if (S_ISFIFO (mode))
1427       return "named pipe";
1428     else if (S_ISLNK (mode))
1429       return "symbolic link";
1430     else if (S_ISSOCK (mode))
1431       return "socket";
1432     else
1433       return "file";
1434 }
1435
1436 static bool
1437 has_color_name (const char *str, const char *name)
1438 {
1439     char *p;
1440
1441     assert (strlen (str));
1442     assert (strlen (name));
1443
1444     if (!(*str == *name || *str == toupper (*name)))
1445       return false;
1446     else if (*(name + 1) != '\0'
1447      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1448       return false;
1449
1450     return true;
1451 }
1452
1453 static FILE *
1454 open_file (const char *file, const char *mode)
1455 {
1456     FILE *stream;
1457
1458     errno = 0;
1459     stream = fopen (file, mode);
1460     if (!stream)
1461       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1462
1463     return stream;
1464 }
1465
1466 #define DO_VFPRINTF(fmt)                    \
1467     va_list ap;                             \
1468     fprintf (stderr, "%s: ", program_name); \
1469     va_start (ap, fmt);                     \
1470     vfprintf (stderr, fmt, ap);             \
1471     va_end (ap);                            \
1472     fprintf (stderr, "\n");                 \
1473
1474 static void
1475 vfprintf_diag (const char *fmt, ...)
1476 {
1477     DO_VFPRINTF (fmt);
1478 }
1479
1480 static void
1481 vfprintf_fail (const char *fmt, ...)
1482 {
1483     DO_VFPRINTF (fmt);
1484     exit (EXIT_FAILURE);
1485 }
1486
1487 static void
1488 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1489 {
1490     /* nothing to stack */
1491     if (ptr == NULL)
1492       return;
1493     if (!*list)
1494       *list = xmalloc (sizeof (void *));
1495     else
1496       {
1497         unsigned int i;
1498         for (i = 0; i < *stacked; i++)
1499           if (!(*list)[i])
1500             {
1501               (*list)[i] = ptr;
1502               return; /* reused */
1503             }
1504         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1505       }
1506     (*list)[index] = ptr;
1507     (*stacked)++;
1508 }
1509
1510 static void
1511 release_var (void **list, unsigned int stacked, void **ptr)
1512 {
1513     unsigned int i;
1514     /* nothing to release */
1515     if (*ptr == NULL)
1516       return;
1517     for (i = 0; i < stacked; i++)
1518       if (list[i] == *ptr)
1519         {
1520           free (*ptr);
1521           *ptr = NULL;
1522           list[i] = NULL;
1523           return;
1524         }
1525 }