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|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 #if DEBUG
 120 # define DEBUG_FILE "debug.txt"
 121 #endif
 122
 123 #define MAX_ATTRIBUTE_CHARS (6 * 2)
 124
 125 #define PROGRAM_NAME "colorize"
 126
 127 #define VERSION "0.63"
 128
 129 typedef enum { false, true } bool;
 130
 131 struct color_name {
 132     char *name;
 133     char *orig;
 134 };
 135
 136 struct color {
 137     const char *name;
 138     const char *code;
 139 };
 140
 141 static const struct color fg_colors[] = {
 142     { "none",     NULL },
 143     { "black",   "30m" },
 144     { "red",     "31m" },
 145     { "green",   "32m" },
 146     { "yellow",  "33m" },
 147     { "blue",    "34m" },
 148     { "magenta", "35m" },
 149     { "cyan",    "36m" },
 150     { "white",   "37m" },
 151     { "default", "39m" },
 152 };
 153 static const struct color bg_colors[] = {
 154     { "none",     NULL },
 155     { "black",   "40m" },
 156     { "red",     "41m" },
 157     { "green",   "42m" },
 158     { "yellow",  "43m" },
 159     { "blue",    "44m" },
 160     { "magenta", "45m" },
 161     { "cyan",    "46m" },
 162     { "white",   "47m" },
 163     { "default", "49m" },
 164 };
 165
 166 struct bytes_size {
 167     unsigned int size;
 168     char unit;
 169 };
 170
 171 enum {
 172     FMT_GENERIC,
 173     FMT_STRING,
 174     FMT_QUOTE,
 175     FMT_COLOR,
 176     FMT_RANDOM,
 177     FMT_ERROR,
 178     FMT_FILE,
 179     FMT_TYPE
 180 };
 181 static const char *formats[] = {
 182     "%s",                     /* generic */
 183     "%s '%s'",                /* string  */
 184     "%s `%s' %s",             /* quote   */
 185     "%s color '%s' %s",       /* color   */
 186     "%s color '%s' %s '%s'",  /* random  */
 187     "less than %lu bytes %s", /* error   */
 188     "%s: %s",                 /* file    */
 189     "%s: %s: %s",             /* type    */
 190 };
 191
 192 enum { GENERIC, FOREGROUND = 0, BACKGROUND };
 193
 194 static const struct {
 195     const struct color *entries;
 196     unsigned int count;
 197     const char *desc;
 198 } tables[] = {
 199     { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
 200     { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
 201 };
 202
 203 enum {
 204     OPT_ATTR = 1,
 205     OPT_CLEAN,
 206     OPT_CLEAN_ALL,
 207     OPT_EXCLUDE_RANDOM,
 208     OPT_HELP,
 209     OPT_VERSION
 210 };
 211 static int opt_type;
 212 static const struct option long_opts[] = {
 213     { "attr",           required_argument, &opt_type, OPT_ATTR           },
 214     { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
 215     { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
 216     { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
 217     { "help",           no_argument,       &opt_type, OPT_HELP           },
 218     { "version",        no_argument,       &opt_type, OPT_VERSION        },
 219     {  NULL,            0,                 NULL,      0                  },
 220 };
 221
 222 enum attr_type {
 223     ATTR_BOLD = 0x01,
 224     ATTR_UNDERSCORE = 0x02,
 225     ATTR_BLINK = 0x04,
 226     ATTR_REVERSE = 0x08,
 227     ATTR_CONCEALED = 0x10
 228 };
 229 struct attr {
 230     const char *name;
 231     unsigned int val;
 232     enum attr_type type;
 233 };
 234
 235 static FILE *stream;
 236 #if DEBUG
 237 static FILE *log;
 238 #endif
 239
 240 static unsigned int stacked_vars;
 241 static void **vars_list;
 242
 243 static bool clean;
 244 static bool clean_all;
 245
 246 static char attr[MAX_ATTRIBUTE_CHARS + 1];
 247 static char *exclude;
 248
 249 static const char *program_name;
 250
 251 static void process_opts (int, char **);
 252 static void process_opt_attr (const char *);
 253 static void write_attr (const struct attr *, unsigned int *);
 254 static void print_hint (void);
 255 static void print_help (void);
 256 static void print_version (void);
 257 static void cleanup (void);
 258 static void free_color_names (struct color_name **);
 259 static void process_args (unsigned int, char **, char *, const struct color **, const char **, FILE **);
 260 static void process_file_arg (const char *, const char **, FILE **);
 261 static void skip_path_colors (const char *, const char *, const struct stat *);
 262 static void gather_color_names (const char *, char *, struct color_name **);
 263 static void read_print_stream (const char *, const struct color **, const char *, FILE *);
 264 static void merge_print_line (const char *, const char *, FILE *);
 265 static void complete_part_line (const char *, char **, FILE *);
 266 static bool get_next_char (char *, const char **, FILE *, bool *);
 267 static void save_char (char, char **, size_t *, size_t *);
 268 static void find_color_entries (struct color_name **, const struct color **);
 269 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 270 static void print_line (const char *, const struct color **, const char * const, unsigned int);
 271 static void print_clean (const char *);
 272 static bool is_esc (const char *);
 273 static const char *get_end_of_esc (const char *);
 274 static const char *get_end_of_text (const char *);
 275 static void print_text (const char *, size_t);
 276 static bool gather_esc_offsets (const char *, const char **, const char **);
 277 static bool validate_esc_clean_all (const char **);
 278 static bool validate_esc_clean (int, unsigned int, unsigned int *, const char **, bool *);
 279 static bool is_reset (int, unsigned int, const char **);
 280 static bool is_attr (int, unsigned int, unsigned int, const char **);
 281 static bool is_fg_color (int, const char **);
 282 static bool is_bg_color (int, unsigned int, const char **);
 283 #if !DEBUG
 284 static void *malloc_wrap (size_t);
 285 static void *calloc_wrap (size_t, size_t);
 286 static void *realloc_wrap (void *, size_t);
 287 #else
 288 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 289 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 290 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 291 #endif
 292 static void free_wrap (void **);
 293 static char *strdup_wrap (const char *, const char *, unsigned int);
 294 static char *str_concat_wrap (const char *, const char *, const char *, unsigned int);
 295 static bool get_bytes_size (unsigned long, struct bytes_size *);
 296 static char *get_file_type (mode_t);
 297 static bool has_color_name (const char *, const char *);
 298 static FILE *open_file (const char *, const char *);
 299 static void vfprintf_diag (const char *, ...);
 300 static void vfprintf_fail (const char *, ...);
 301 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 302 static void release_var (void **, unsigned int, void **);
 303
 304 extern int optind;
 305
 306 int
 307 main (int argc, char **argv)
 308 {
 309     unsigned int arg_cnt;
 310
 311     const struct color *colors[2] = {
 312         NULL, /* foreground */
 313         NULL, /* background */
 314     };
 315
 316     const char *file = NULL;
 317
 318     program_name = argv[0];
 319     atexit (cleanup);
 320
 321     setvbuf (stdout, NULL, _IOLBF, 0);
 322
 323 #if DEBUG
 324     log = open_file (DEBUG_FILE, "w");
 325 #endif
 326
 327     attr[0] = '\0';
 328
 329     process_opts (argc, argv);
 330
 331     arg_cnt = argc - optind;
 332
 333     if (clean || clean_all)
 334       {
 335         if (clean && clean_all)
 336           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 337         if (arg_cnt > 1)
 338           {
 339             const char *format = "%s %s";
 340             const char *message = "switch cannot be used with more than one file";
 341             if (clean)
 342               vfprintf_fail (format, "--clean", message);
 343             else if (clean_all)
 344               vfprintf_fail (format, "--clean-all", message);
 345           }
 346       }
 347     else
 348       {
 349         if (arg_cnt == 0 || arg_cnt > 2)
 350           {
 351             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
 352             print_hint ();
 353             exit (EXIT_FAILURE);
 354           }
 355       }
 356
 357     if (clean || clean_all)
 358       process_file_arg (argv[optind], &file, &stream);
 359     else
 360       process_args (arg_cnt, &argv[optind], &attr[0], colors, &file, &stream);
 361     read_print_stream (&attr[0], colors, file, stream);
 362
 363     RELEASE_VAR (exclude);
 364
 365     exit (EXIT_SUCCESS);
 366 }
 367
 368 #define PRINT_HELP_EXIT() \
 369     print_help ();        \
 370     exit (EXIT_SUCCESS);  \
 371
 372 #define PRINT_VERSION_EXIT() \
 373     print_version ();        \
 374     exit (EXIT_SUCCESS);     \
 375
 376 extern char *optarg;
 377
 378 static void
 379 process_opts (int argc, char **argv)
 380 {
 381     int opt;
 382     while ((opt = getopt_long (argc, argv, "hV", long_opts, NULL)) != -1)
 383       {
 384         switch (opt)
 385           {
 386             case 0: /* long opts */
 387               switch (opt_type)
 388                 {
 389                   case OPT_ATTR:
 390                     process_opt_attr (optarg);
 391                     break;
 392                   case OPT_CLEAN:
 393                     clean = true;
 394                     break;
 395                   case OPT_CLEAN_ALL:
 396                     clean_all = true;
 397                     break;
 398                   case OPT_EXCLUDE_RANDOM: {
 399                     bool valid = false;
 400                     unsigned int i;
 401                     exclude = xstrdup (optarg);
 402                     STACK_VAR (exclude);
 403                     for (i = 1; i < tables[GENERIC].count - 1; i++) /* skip color none and default */
 404                       {
 405                         const struct color *entry = &tables[GENERIC].entries[i];
 406                         if (streq (exclude, entry->name))
 407                           {
 408                             valid = true;
 409                             break;
 410                           }
 411                       }
 412                     if (!valid)
 413                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain color");
 414                     break;
 415                   }
 416                   case OPT_HELP:
 417                     PRINT_HELP_EXIT ();
 418                   case OPT_VERSION:
 419                     PRINT_VERSION_EXIT ();
 420                   default: /* never reached */
 421                     ABORT_TRACE ();
 422                 }
 423               break;
 424             case 'h':
 425               PRINT_HELP_EXIT ();
 426             case 'V':
 427               PRINT_VERSION_EXIT ();
 428             case '?':
 429               print_hint ();
 430               exit (EXIT_FAILURE);
 431             default: /* never reached */
 432               ABORT_TRACE ();
 433           }
 434       }
 435 }
 436
 437 static void
 438 process_opt_attr (const char *p)
 439 {
 440     /* If attributes are added to this "list", also increase MAX_ATTRIBUTE_CHARS!  */
 441     const struct attr attrs[] = {
 442         { "bold",       1, ATTR_BOLD       },
 443         { "underscore", 4, ATTR_UNDERSCORE },
 444         { "blink",      5, ATTR_BLINK      },
 445         { "reverse",    7, ATTR_REVERSE    },
 446         { "concealed",  8, ATTR_CONCEALED  },
 447     };
 448     unsigned int attr_types = 0;
 449
 450     while (*p)
 451       {
 452         const char *s;
 453         if (!isalnum (*p))
 454           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must be provided a string");
 455         s = p;
 456         while (isalnum (*p))
 457           p++;
 458         if (*p != '\0' && *p != ',')
 459           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must have strings separated by ,");
 460         else
 461           {
 462             bool valid_attr = false;
 463             unsigned int i;
 464             for (i = 0; i < sizeof (attrs) / sizeof (struct attr); i++)
 465               {
 466                 const size_t name_len = strlen (attrs[i].name);
 467                 if ((size_t)(p - s) == name_len && strneq (s, attrs[i].name, name_len))
 468                   {
 469                     write_attr (&attrs[i], &attr_types);
 470                     valid_attr = true;
 471                     break;
 472                   }
 473               }
 474             if (!valid_attr)
 475               {
 476                 char *attr_invalid = xmalloc ((p - s) + 1);
 477                 STACK_VAR (attr_invalid);
 478                 strncpy (attr_invalid, s, p - s);
 479                 attr_invalid[p - s] = '\0';
 480                 vfprintf_fail ("--attr switch attribute '%s' is not valid", attr_invalid);
 481                 RELEASE_VAR (attr_invalid); /* never reached */
 482               }
 483           }
 484         if (*p)
 485           p++;
 486       }
 487 }
 488
 489 static void
 490 write_attr (const struct attr *attr_i, unsigned int *attr_types)
 491 {
 492     const unsigned int val = attr_i->val;
 493     const enum attr_type attr_type = attr_i->type;
 494     const char *attr_name = attr_i->name;
 495
 496     if (*attr_types & attr_type)
 497       vfprintf_fail ("--attr switch has attribute '%s' twice or more", attr_name);
 498     snprintf (attr + strlen (attr), 3, "%u;", val);
 499     *attr_types |= attr_type;
 500 }
 501
 502 static void
 503 print_hint (void)
 504 {
 505     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 506 }
 507
 508 static void
 509 print_help (void)
 510 {
 511     struct opt_data {
 512         const char *name;
 513         const char *short_opt;
 514         const char *arg;
 515     };
 516     const struct opt_data opts_data[] = {
 517         { "attr",           NULL, "=ATTR1,ATTR2,..." },
 518         { "exclude-random", NULL, "=COLOR"           },
 519         { "help",           "h",  NULL               },
 520         { "version",        "V",  NULL               },
 521     };
 522     const struct option *opt = long_opts;
 523     unsigned int i;
 524
 525     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 526     printf ("\tColors (foreground) (background)\n");
 527     for (i = 0; i < tables[FOREGROUND].count; i++)
 528       {
 529         const struct color *entry = &tables[FOREGROUND].entries[i];
 530         const char *name = entry->name;
 531         const char *code = entry->code;
 532         if (code)
 533           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 534                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 535         else
 536           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 537       }
 538     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 539
 540     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 541     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 542
 543     printf ("\n\tOptions\n");
 544     for (; opt->name; opt++)
 545       {
 546         const struct opt_data *opt_data = NULL;
 547         unsigned int i;
 548         for (i = 0; i < sizeof (opts_data) / sizeof (struct opt_data); i++)
 549           if (streq (opt->name, opts_data[i].name))
 550             {
 551               opt_data = &opts_data[i];
 552               break;
 553             }
 554         if (opt_data)
 555           {
 556             if (opt_data->short_opt)
 557               printf ("\t\t-%s, --%s\n", opt_data->short_opt, opt->name);
 558             else
 559               printf ("\t\t    --%s%s\n", opt->name, opt_data->arg);
 560           }
 561         else
 562           printf ("\t\t    --%s\n", opt->name);
 563       }
 564     printf ("\n");
 565 }
 566
 567 static void
 568 print_version (void)
 569 {
 570 #ifdef HAVE_VERSION
 571 # include "version.h"
 572 #else
 573     const char *version = NULL;
 574 #endif
 575     const char *version_prefix, *version_string;
 576     const char *c_flags, *ld_flags, *cpp_flags;
 577     const char *const desc_flags_unknown = "unknown";
 578     struct bytes_size bytes_size;
 579     bool debug;
 580 #ifdef CFLAGS
 581     c_flags = to_str (CFLAGS);
 582 #else
 583     c_flags = desc_flags_unknown;
 584 #endif
 585 #ifdef LDFLAGS
 586     ld_flags = to_str (LDFLAGS);
 587 #else
 588     ld_flags = desc_flags_unknown;
 589 #endif
 590 #ifdef CPPFLAGS
 591     cpp_flags = to_str (CPPFLAGS);
 592 #else
 593     cpp_flags = desc_flags_unknown;
 594 #endif
 595 #if DEBUG
 596     debug = true;
 597 #else
 598     debug = false;
 599 #endif
 600     version_prefix = version ? "" : "v";
 601     version_string = version ? version : VERSION;
 602     printf ("%s %s%s (compiled at %s, %s)\n", PROGRAM_NAME, version_prefix, version_string, __DATE__, __TIME__);
 603
 604     printf ("Compiler flags: %s\n", c_flags);
 605     printf ("Linker flags: %s\n", ld_flags);
 606     printf ("Preprocessor flags: %s\n", cpp_flags);
 607     if (get_bytes_size (BUF_SIZE, &bytes_size))
 608       {
 609         if (BUF_SIZE % 1024 == 0)
 610           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 611         else
 612           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 613                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 614       }
 615     else
 616       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 617     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 618     printf ("Debugging: %s\n", debug ? "yes" : "no");
 619 }
 620
 621 static void
 622 cleanup (void)
 623 {
 624     if (stream && fileno (stream) != STDIN_FILENO)
 625       fclose (stream);
 626 #if DEBUG
 627     if (log)
 628       fclose (log);
 629 #endif
 630
 631     if (vars_list)
 632       {
 633         unsigned int i;
 634         for (i = 0; i < stacked_vars; i++)
 635           free (vars_list[i]);
 636         free_null (vars_list);
 637       }
 638 }
 639
 640 static void
 641 free_color_names (struct color_name **color_names)
 642 {
 643     unsigned int i;
 644     for (i = 0; color_names[i]; i++)
 645       {
 646         RELEASE_VAR (color_names[i]->name);
 647         RELEASE_VAR (color_names[i]->orig);
 648         RELEASE_VAR (color_names[i]);
 649       }
 650 }
 651
 652 static void
 653 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream)
 654 {
 655     int ret;
 656     char *p;
 657     struct stat sb;
 658     struct color_name *color_names[3] = { NULL, NULL, NULL };
 659
 660     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 661     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 662
 663     assert (color_string != NULL);
 664
 665     if (streq (color_string, "-"))
 666       {
 667         if (file_string)
 668           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 669         else
 670           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 671       }
 672
 673     ret = lstat (color_string, &sb);
 674
 675     /* Ensure that we don't fail if there's a file with one or more
 676        color names in its path.  */
 677     if (ret == 0) /* success */
 678       skip_path_colors (color_string, file_string, &sb);
 679
 680     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 681       {
 682         if (p == color_string)
 683           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
 684         else if (p == color_string + strlen (color_string) - 1)
 685           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
 686         else if (strchr (++p, COLOR_SEP_CHAR))
 687           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
 688       }
 689
 690     gather_color_names (color_string, attr, color_names);
 691
 692     assert (color_names[FOREGROUND] != NULL);
 693
 694     if (color_names[BACKGROUND])
 695       {
 696         unsigned int i;
 697         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 698         for (i = 0; i < 2; i++)
 699           {
 700             const unsigned int color1 = color_sets[i][0];
 701             const unsigned int color2 = color_sets[i][1];
 702             if (CHECK_COLORS_RANDOM (color1, color2))
 703               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 704           }
 705       }
 706
 707     find_color_entries (color_names, colors);
 708     assert (colors[FOREGROUND] != NULL);
 709     free_color_names (color_names);
 710
 711     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 712       {
 713         struct color_name color_name;
 714         color_name.name = color_name.orig = "default";
 715
 716         find_color_entry (&color_name, FOREGROUND, colors);
 717         assert (colors[FOREGROUND]->code != NULL);
 718       }
 719
 720     process_file_arg (file_string, file, stream);
 721 }
 722
 723 static void
 724 process_file_arg (const char *file_string, const char **file, FILE **stream)
 725 {
 726     if (file_string)
 727       {
 728         if (streq (file_string, "-"))
 729           *stream = stdin;
 730         else
 731           {
 732             const char *file = file_string;
 733             struct stat sb;
 734             int ret;
 735
 736             errno = 0;
 737             ret = stat (file, &sb);
 738
 739             if (ret == -1)
 740               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 741
 742             if (!VALID_FILE_TYPE (sb.st_mode))
 743               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
 744
 745             *stream = open_file (file, "r");
 746           }
 747         *file = file_string;
 748       }
 749     else
 750       {
 751         *stream = stdin;
 752         *file = "stdin";
 753       }
 754
 755     assert (*stream != NULL);
 756     assert (*file != NULL);
 757 }
 758
 759 static void
 760 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb)
 761 {
 762     bool have_file;
 763     unsigned int c;
 764     const char *color = color_string;
 765     const mode_t mode = sb->st_mode;
 766
 767     for (c = 1; c <= 2 && *color; c++)
 768       {
 769         bool matched = false;
 770         unsigned int i;
 771         for (i = 0; i < tables[GENERIC].count; i++)
 772           {
 773             const struct color *entry = &tables[GENERIC].entries[i];
 774             if (has_color_name (color, entry->name))
 775               {
 776                 color += strlen (entry->name);
 777                 matched = true;
 778                 break;
 779               }
 780           }
 781         if (!matched && has_color_name (color, "random"))
 782           {
 783             color += strlen ("random");
 784             matched = true;
 785           }
 786         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 787           color++;
 788         else
 789           break;
 790       }
 791
 792     have_file = (*color != '\0');
 793
 794     if (have_file)
 795       {
 796         const char *file_existing = color_string;
 797         if (file_string)
 798           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "cannot be used as color string");
 799         else
 800           {
 801             if (VALID_FILE_TYPE (mode))
 802               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "must be preceded by color string");
 803             else
 804               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "is not a valid file type");
 805           }
 806       }
 807 }
 808
 809 static void
 810 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
 811 {
 812     unsigned int index;
 813     char *color, *p, *str;
 814
 815     str = xstrdup (color_string);
 816     STACK_VAR (str);
 817
 818     for (index = 0, color = str; *color; index++, color = p)
 819       {
 820         char *ch, *sep;
 821
 822         p = NULL;
 823         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 824           {
 825             *sep = '\0';
 826             p = sep + 1;
 827           }
 828         else
 829           p = color + strlen (color);
 830         assert (p != NULL);
 831
 832         for (ch = color; *ch; ch++)
 833           if (!isalpha (*ch))
 834             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 835
 836         for (ch = color + 1; *ch; ch++)
 837           if (!islower (*ch))
 838             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 839
 840         if (streq (color, "None"))
 841           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 842
 843         if (isupper (*color))
 844           {
 845             switch (index)
 846               {
 847                 case FOREGROUND:
 848                   snprintf (attr + strlen (attr), 3, "1;");
 849                   break;
 850                 case BACKGROUND:
 851                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 852                 default: /* never reached */
 853                   ABORT_TRACE ();
 854               }
 855           }
 856
 857         color_names[index] = xcalloc (1, sizeof (struct color_name));
 858         STACK_VAR (color_names[index]);
 859
 860         color_names[index]->orig = xstrdup (color);
 861         STACK_VAR (color_names[index]->orig);
 862
 863         for (ch = color; *ch; ch++)
 864           *ch = tolower (*ch);
 865
 866         color_names[index]->name = xstrdup (color);
 867         STACK_VAR (color_names[index]->name);
 868       }
 869
 870     RELEASE_VAR (str);
 871 }
 872
 873 static void
 874 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
 875 {
 876     char buf[BUF_SIZE + 1];
 877     unsigned int flags = 0;
 878
 879     while (!feof (stream))
 880       {
 881         size_t bytes_read;
 882         char *eol;
 883         const char *line;
 884         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 885         if (bytes_read != BUF_SIZE && ferror (stream))
 886           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 887         buf[bytes_read] = '\0';
 888         line = buf;
 889         while ((eol = strpbrk (line, "\n\r")))
 890           {
 891             const char *p;
 892             flags &= ~(CR|LF);
 893             if (*eol == '\r')
 894               {
 895                 flags |= CR;
 896                 if (*(eol + 1) == '\n')
 897                   flags |= LF;
 898               }
 899             else if (*eol == '\n')
 900               flags |= LF;
 901             else
 902               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 903             p = eol + SKIP_LINE_ENDINGS (flags);
 904             *eol = '\0';
 905             print_line (attr, colors, line, flags);
 906             line = p;
 907           }
 908         if (feof (stream))
 909           {
 910             if (*line != '\0')
 911               print_line (attr, colors, line, 0);
 912           }
 913         else if (*line != '\0')
 914           {
 915             char *p;
 916             if ((clean || clean_all) && (p = strrchr (line, '\033')))
 917               merge_print_line (line, p, stream);
 918             else
 919               print_line (attr, colors, line, 0);
 920           }
 921       }
 922 }
 923
 924 static void
 925 merge_print_line (const char *line, const char *p, FILE *stream)
 926 {
 927     char *buf = NULL;
 928     char *merged_esc = NULL;
 929     const char *esc = "";
 930     const char char_restore = *p;
 931
 932     complete_part_line (p + 1, &buf, stream);
 933
 934     if (buf)
 935       {
 936         /* form escape sequence */
 937         esc = merged_esc = str_concat (p, buf);
 938         /* shorten partial line accordingly */
 939         *(char *)p = '\0';
 940         free (buf);
 941       }
 942
 943 #ifdef TEST_MERGE_PART_LINE
 944     printf ("%s%s", line, esc);
 945     fflush (stdout);
 946     _exit (EXIT_SUCCESS);
 947 #else
 948     print_clean (line);
 949     *(char *)p = char_restore;
 950     print_clean (esc);
 951     free (merged_esc);
 952 #endif
 953 }
 954
 955 static void
 956 complete_part_line (const char *p, char **buf, FILE *stream)
 957 {
 958     bool got_next_char = false, read_from_stream;
 959     char ch;
 960     size_t i = 0, size;
 961
 962     if (get_next_char (&ch, &p, stream, &read_from_stream))
 963       {
 964         if (ch == '[')
 965           {
 966             if (read_from_stream)
 967               save_char (ch, buf, &i, &size);
 968           }
 969         else
 970           {
 971             if (read_from_stream)
 972               ungetc ((int)ch, stream);
 973             return; /* cancel */
 974           }
 975       }
 976     else
 977       return; /* cancel */
 978
 979     while (get_next_char (&ch, &p, stream, &read_from_stream))
 980       {
 981         if (isdigit (ch) || ch == ';')
 982           {
 983             if (read_from_stream)
 984               save_char (ch, buf, &i, &size);
 985           }
 986         else /* got next character */
 987           {
 988             got_next_char = true;
 989             break;
 990           }
 991       }
 992
 993     if (got_next_char)
 994       {
 995         if (ch == 'm')
 996           {
 997             if (read_from_stream)
 998               save_char (ch, buf, &i, &size);
 999           }
1000         else
1001           {
1002             if (read_from_stream)
1003               ungetc ((int)ch, stream);
1004             return; /* cancel */
1005           }
1006       }
1007     else
1008       return; /* cancel */
1009 }
1010
1011 static bool
1012 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
1013 {
1014     if (**p == '\0')
1015       {
1016         int c;
1017         if ((c = fgetc (stream)) != EOF)
1018           {
1019             *ch = (char)c;
1020             *read_from_stream = true;
1021             return true;
1022           }
1023         else
1024           {
1025             *read_from_stream = false;
1026             return false;
1027           }
1028       }
1029     else
1030       {
1031         *ch = **p;
1032         (*p)++;
1033         *read_from_stream = false;
1034         return true;
1035       }
1036 }
1037
1038 static void
1039 save_char (char ch, char **buf, size_t *i, size_t *size)
1040 {
1041     if (!*buf)
1042       {
1043         *size = ALLOC_COMPLETE_PART_LINE;
1044         *buf = xmalloc (*size);
1045       }
1046     /* +1: effective occupied size of buffer */
1047     else if ((*i + 1) == *size)
1048       {
1049         *size *= 2;
1050         *buf = xrealloc (*buf, *size);
1051       }
1052     (*buf)[*i] = ch;
1053     (*buf)[*i + 1] = '\0';
1054     (*i)++;
1055 }
1056
1057 static void
1058 find_color_entries (struct color_name **color_names, const struct color **colors)
1059 {
1060     struct timeval tv;
1061     unsigned int index;
1062
1063     /* randomness */
1064     gettimeofday (&tv, NULL);
1065     srand (tv.tv_usec * tv.tv_sec);
1066
1067     for (index = 0; color_names[index]; index++)
1068       {
1069         const char *color_name = color_names[index]->name;
1070
1071         const unsigned int count                = tables[index].count;
1072         const struct color *const color_entries = tables[index].entries;
1073
1074         if (streq (color_name, "random"))
1075           {
1076             bool excludable;
1077             unsigned int i;
1078             do {
1079               excludable = false;
1080               i = rand() % (count - 2) + 1; /* omit color none and default */
1081               switch (index)
1082                 {
1083                   case FOREGROUND:
1084                     /* --exclude-random */
1085                     if (exclude && streq (exclude, color_entries[i].name))
1086                       excludable = true;
1087                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1088                       excludable = true;
1089                     break;
1090                   case BACKGROUND:
1091                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1092                       excludable = true;
1093                     break;
1094                   default: /* never reached */
1095                     ABORT_TRACE ();
1096                  }
1097             } while (excludable);
1098             colors[index] = (struct color *)&color_entries[i];
1099           }
1100         else
1101           find_color_entry (color_names[index], index, colors);
1102       }
1103 }
1104
1105 static void
1106 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1107 {
1108     bool found = false;
1109     unsigned int i;
1110
1111     const unsigned int count                = tables[index].count;
1112     const struct color *const color_entries = tables[index].entries;
1113
1114     for (i = 0; i < count; i++)
1115       if (streq (color_name->name, color_entries[i].name))
1116         {
1117           colors[index] = (struct color *)&color_entries[i];
1118           found = true;
1119           break;
1120         }
1121     if (!found)
1122       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1123 }
1124
1125 static void
1126 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags)
1127 {
1128     /* --clean[-all] */
1129     if (clean || clean_all)
1130       print_clean (line);
1131     else
1132       {
1133         /* Foreground color code is guaranteed to be set when background color code is present.  */
1134         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1135           printf ("\033[%s", colors[BACKGROUND]->code);
1136         if (colors[FOREGROUND]->code)
1137           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1138         else
1139           printf (formats[FMT_GENERIC], line);
1140       }
1141     if (flags & CR)
1142       putchar ('\r');
1143     if (flags & LF)
1144       putchar ('\n');
1145 }
1146
1147 static void
1148 print_clean (const char *line)
1149 {
1150     const char *p = line;
1151
1152     if (is_esc (p))
1153       p = get_end_of_esc (p);
1154
1155     while (*p != '\0')
1156       {
1157         const char *text_start = p;
1158         const char *text_end = get_end_of_text (p);
1159         print_text (text_start, text_end - text_start);
1160         p = get_end_of_esc (text_end);
1161       }
1162 }
1163
1164 static bool
1165 is_esc (const char *p)
1166 {
1167     return gather_esc_offsets (p, NULL, NULL);
1168 }
1169
1170 static const char *
1171 get_end_of_esc (const char *p)
1172 {
1173     const char *esc;
1174     const char *end = NULL;
1175     while ((esc = strchr (p, '\033')))
1176       {
1177         if (gather_esc_offsets (esc, NULL, &end))
1178           break;
1179         p = esc + 1;
1180       }
1181     return end ? end + 1 : p + strlen (p);
1182 }
1183
1184 static const char *
1185 get_end_of_text (const char *p)
1186 {
1187     const char *esc;
1188     const char *start = NULL;
1189     while ((esc = strchr (p, '\033')))
1190       {
1191         if (gather_esc_offsets (esc, &start, NULL))
1192           break;
1193         p = esc + 1;
1194       }
1195     return start ? start : p + strlen (p);
1196 }
1197
1198 static void
1199 print_text (const char *p, size_t len)
1200 {
1201     size_t bytes_written;
1202     bytes_written = fwrite (p, 1, len, stdout);
1203     if (bytes_written != len)
1204       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1205 }
1206
1207 static bool
1208 gather_esc_offsets (const char *p, const char **start, const char **end)
1209 {
1210     /* ESC[ */
1211     if (*p == 27 && *(p + 1) == '[')
1212       {
1213         bool valid = false;
1214         const char *const begin = p;
1215         p += 2;
1216         if (clean_all)
1217           valid = validate_esc_clean_all (&p);
1218         else if (clean)
1219           {
1220             bool check_values;
1221             unsigned int prev_iter, iter;
1222             const char *digit;
1223             prev_iter = iter = 0;
1224             do {
1225               check_values = false;
1226               iter++;
1227               if (!isdigit (*p))
1228                 break;
1229               digit = p;
1230               while (isdigit (*p))
1231                 p++;
1232               if (p - digit > 2)
1233                 break;
1234               else /* check range */
1235                 {
1236                   char val[3];
1237                   int value;
1238                   unsigned int i;
1239                   const unsigned int digits = p - digit;
1240                   for (i = 0; i < digits; i++)
1241                     val[i] = *digit++;
1242                   val[i] = '\0';
1243                   value = atoi (val);
1244                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1245                 }
1246             } while (check_values);
1247           }
1248         if (valid)
1249           {
1250             if (start)
1251               *start = begin;
1252             if (end)
1253               *end = p;
1254             return true;
1255           }
1256       }
1257     return false;
1258 }
1259
1260 static bool
1261 validate_esc_clean_all (const char **p)
1262 {
1263     while (isdigit (**p) || **p == ';')
1264       (*p)++;
1265     return (**p == 'm');
1266 }
1267
1268 static bool
1269 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1270 {
1271     if (is_reset (value, iter, p))
1272       return true;
1273     else if (is_attr (value, iter, *prev_iter, p))
1274       {
1275         (*p)++;
1276         *check_values = true;
1277         *prev_iter = iter;
1278         return false; /* partial escape sequence, need another valid value */
1279       }
1280     else if (is_fg_color (value, p))
1281       return true;
1282     else if (is_bg_color (value, iter, p))
1283       return true;
1284     else
1285       return false;
1286 }
1287
1288 static bool
1289 is_reset (int value, unsigned int iter, const char **p)
1290 {
1291     return (value == 0 && iter == 1 && **p == 'm');
1292 }
1293
1294 static bool
1295 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1296 {
1297     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1298 }
1299
1300 static bool
1301 is_fg_color (int value, const char **p)
1302 {
1303     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1304 }
1305
1306 static bool
1307 is_bg_color (int value, unsigned int iter, const char **p)
1308 {
1309     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1310 }
1311
1312 #if !DEBUG
1313 static void *
1314 malloc_wrap (size_t size)
1315 {
1316     void *p = malloc (size);
1317     if (!p)
1318       MEM_ALLOC_FAIL ();
1319     return p;
1320 }
1321
1322 static void *
1323 calloc_wrap (size_t nmemb, size_t size)
1324 {
1325     void *p = calloc (nmemb, size);
1326     if (!p)
1327       MEM_ALLOC_FAIL ();
1328     return p;
1329 }
1330
1331 static void *
1332 realloc_wrap (void *ptr, size_t size)
1333 {
1334     void *p = realloc (ptr, size);
1335     if (!p)
1336       MEM_ALLOC_FAIL ();
1337     return p;
1338 }
1339 #else
1340 static void *
1341 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1342 {
1343     void *p = malloc (size);
1344     if (!p)
1345       MEM_ALLOC_FAIL_DEBUG (file, line);
1346     fprintf (log, "%s: malloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1347     return p;
1348 }
1349
1350 static void *
1351 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1352 {
1353     void *p = calloc (nmemb, size);
1354     if (!p)
1355       MEM_ALLOC_FAIL_DEBUG (file, line);
1356     fprintf (log, "%s: calloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)(nmemb * size), file, line);
1357     return p;
1358 }
1359
1360 static void *
1361 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1362 {
1363     void *p = realloc (ptr, size);
1364     if (!p)
1365       MEM_ALLOC_FAIL_DEBUG (file, line);
1366     fprintf (log, "%s: realloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
1367     return p;
1368 }
1369 #endif /* !DEBUG */
1370
1371 static void
1372 free_wrap (void **ptr)
1373 {
1374     free (*ptr);
1375     *ptr = NULL;
1376 }
1377
1378 #if !DEBUG
1379 # define do_malloc(len, file, line) malloc_wrap(len)
1380 #else
1381 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1382 #endif
1383
1384 static char *
1385 strdup_wrap (const char *str, const char *file, unsigned int line)
1386 {
1387     const size_t len = strlen (str) + 1;
1388     char *p = do_malloc (len, file, line);
1389     strncpy (p, str, len);
1390     return p;
1391 }
1392
1393 static char *
1394 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1395 {
1396     const size_t len = strlen (str1) + strlen (str2) + 1;
1397     char *p, *str;
1398
1399     p = str = do_malloc (len, file, line);
1400     strncpy (p, str1, strlen (str1));
1401     p += strlen (str1);
1402     strncpy (p, str2, strlen (str2));
1403     p += strlen (str2);
1404     *p = '\0';
1405
1406     return str;
1407 }
1408
1409 static bool
1410 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1411 {
1412     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1413     unsigned long size = bytes;
1414     if (bytes < 1024)
1415       return false;
1416     unit = units;
1417     while (size >= 1024 && *(unit + 1))
1418       {
1419         size /= 1024;
1420         unit++;
1421       }
1422     bytes_size->size = (unsigned int)size;
1423     bytes_size->unit = *unit;
1424     return true;
1425 }
1426
1427 static char *
1428 get_file_type (mode_t mode)
1429 {
1430     if (S_ISREG (mode))
1431       return "file";
1432     else if (S_ISDIR (mode))
1433       return "directory";
1434     else if (S_ISCHR (mode))
1435       return "character device";
1436     else if (S_ISBLK (mode))
1437       return "block device";
1438     else if (S_ISFIFO (mode))
1439       return "named pipe";
1440     else if (S_ISLNK (mode))
1441       return "symbolic link";
1442     else if (S_ISSOCK (mode))
1443       return "socket";
1444     else
1445       return "file";
1446 }
1447
1448 static bool
1449 has_color_name (const char *str, const char *name)
1450 {
1451     char *p;
1452
1453     assert (strlen (str) > 0);
1454     assert (strlen (name) > 0);
1455
1456     if (!(*str == *name || *str == toupper (*name)))
1457       return false;
1458     else if (*(name + 1) != '\0'
1459      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1460       return false;
1461     else
1462       return true;
1463 }
1464
1465 static FILE *
1466 open_file (const char *file, const char *mode)
1467 {
1468     FILE *stream;
1469
1470     errno = 0;
1471     stream = fopen (file, mode);
1472     if (!stream)
1473       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1474
1475     return stream;
1476 }
1477
1478 #define DO_VFPRINTF(fmt)                    \
1479     va_list ap;                             \
1480     fprintf (stderr, "%s: ", program_name); \
1481     va_start (ap, fmt);                     \
1482     vfprintf (stderr, fmt, ap);             \
1483     va_end (ap);                            \
1484     fprintf (stderr, "\n");                 \
1485
1486 static void
1487 vfprintf_diag (const char *fmt, ...)
1488 {
1489     DO_VFPRINTF (fmt);
1490 }
1491
1492 static void
1493 vfprintf_fail (const char *fmt, ...)
1494 {
1495     DO_VFPRINTF (fmt);
1496     exit (EXIT_FAILURE);
1497 }
1498
1499 static void
1500 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1501 {
1502     /* nothing to stack */
1503     if (ptr == NULL)
1504       return;
1505     if (!*list)
1506       *list = xmalloc (sizeof (void *));
1507     else
1508       {
1509         unsigned int i;
1510         for (i = 0; i < *stacked; i++)
1511           if (!(*list)[i])
1512             {
1513               (*list)[i] = ptr;
1514               return; /* reused */
1515             }
1516         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1517       }
1518     (*list)[index] = ptr;
1519     (*stacked)++;
1520 }
1521
1522 static void
1523 release_var (void **list, unsigned int stacked, void **ptr)
1524 {
1525     unsigned int i;
1526     /* nothing to release */
1527     if (*ptr == NULL)
1528       return;
1529     for (i = 0; i < stacked; i++)
1530       if (list[i] == *ptr)
1531         {
1532           free (*ptr);
1533           *ptr = NULL;
1534           list[i] = NULL;
1535           return;
1536         }
1537 }