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) 2011-2018 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 COUNT_OF(obj, type) (sizeof (obj) / sizeof (type))
  77
  78 #define SKIP_LINE_ENDINGS(flags) ((flags) == (CR|LF) ? 2 : 1)
  79
  80 #define VALID_FILE_TYPE(mode) (S_ISREG (mode) || S_ISLNK (mode) || S_ISFIFO (mode))
  81
  82 #define STACK_VAR(ptr) do {                                   \
  83     stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
  84 } while (false)
  85
  86 #define RELEASE_VAR(ptr) do {                             \
  87     release_var (vars_list, stacked_vars, (void **)&ptr); \
  88 } while (false)
  89
  90 #if !DEBUG
  91 # define MEM_ALLOC_FAIL() do {                                         \
  92     fprintf (stderr, "%s: memory allocation failure\n", program_name); \
  93     exit (EXIT_FAILURE);                                               \
  94 } while (false)
  95 #else
  96 # define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                              \
  97     fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
  98     exit (EXIT_FAILURE);                                                                    \
  99 } while (false)
 100 #endif
 101
 102 #define ABORT_TRACE()                                                              \
 103     fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
 104     abort ();
 105
 106 #define CHECK_COLORS_RANDOM(color1, color2)        \
 107      streq (color_names[color1]->name, "random")   \
 108  && (streq (color_names[color2]->name, "none")     \
 109   || streq (color_names[color2]->name, "default"))
 110
 111 #define ALLOC_COMPLETE_PART_LINE 8
 112
 113 #if defined(COLOR_SEP_CHAR_COLON)
 114 # define COLOR_SEP_CHAR ':'
 115 #elif defined(COLOR_SEP_CHAR_SLASH)
 116 # define COLOR_SEP_CHAR '/'
 117 #else
 118 # define COLOR_SEP_CHAR '/'
 119 #endif
 120
 121 #if DEBUG
 122 # define DEBUG_FILE "debug.txt"
 123 #endif
 124
 125 #define MAX_ATTRIBUTE_CHARS (6 * 2)
 126
 127 #define PROGRAM_NAME "colorize"
 128
 129 #define VERSION "0.64"
 130
 131 typedef enum { false, true } bool;
 132
 133 struct color_name {
 134     char *name;
 135     char *orig;
 136 };
 137
 138 struct color {
 139     const char *name;
 140     const char *code;
 141 };
 142
 143 static const struct color fg_colors[] = {
 144     { "none",     NULL },
 145     { "black",   "30m" },
 146     { "red",     "31m" },
 147     { "green",   "32m" },
 148     { "yellow",  "33m" },
 149     { "blue",    "34m" },
 150     { "magenta", "35m" },
 151     { "cyan",    "36m" },
 152     { "white",   "37m" },
 153     { "default", "39m" },
 154 };
 155 static const struct color bg_colors[] = {
 156     { "none",     NULL },
 157     { "black",   "40m" },
 158     { "red",     "41m" },
 159     { "green",   "42m" },
 160     { "yellow",  "43m" },
 161     { "blue",    "44m" },
 162     { "magenta", "45m" },
 163     { "cyan",    "46m" },
 164     { "white",   "47m" },
 165     { "default", "49m" },
 166 };
 167
 168 struct bytes_size {
 169     unsigned int size;
 170     char unit;
 171 };
 172
 173 enum {
 174     FMT_GENERIC,
 175     FMT_STRING,
 176     FMT_QUOTE,
 177     FMT_COLOR,
 178     FMT_RANDOM,
 179     FMT_ERROR,
 180     FMT_FILE,
 181     FMT_TYPE
 182 };
 183 static const char *formats[] = {
 184     "%s",                     /* generic */
 185     "%s '%s'",                /* string  */
 186     "%s `%s' %s",             /* quote   */
 187     "%s color '%s' %s",       /* color   */
 188     "%s color '%s' %s '%s'",  /* random  */
 189     "less than %lu bytes %s", /* error   */
 190     "%s: %s",                 /* file    */
 191     "%s: %s: %s",             /* type    */
 192 };
 193
 194 enum { GENERIC, FOREGROUND = 0, BACKGROUND };
 195
 196 static const struct {
 197     const struct color *entries;
 198     unsigned int count;
 199     const char *desc;
 200 } tables[] = {
 201     { fg_colors, COUNT_OF (fg_colors, struct color), "foreground" },
 202     { bg_colors, COUNT_OF (bg_colors, struct color), "background" },
 203 };
 204
 205 enum {
 206     OPT_ATTR = 1,
 207     OPT_CLEAN,
 208     OPT_CLEAN_ALL,
 209     OPT_EXCLUDE_RANDOM,
 210     OPT_OMIT_COLOR_EMPTY,
 211     OPT_HELP,
 212     OPT_VERSION
 213 };
 214 static int opt_type;
 215 static const struct option long_opts[] = {
 216     { "attr",             required_argument, &opt_type, OPT_ATTR             },
 217     { "clean",            no_argument,       &opt_type, OPT_CLEAN            },
 218     { "clean-all",        no_argument,       &opt_type, OPT_CLEAN_ALL        },
 219     { "exclude-random",   required_argument, &opt_type, OPT_EXCLUDE_RANDOM   },
 220     { "omit-color-empty", no_argument,       &opt_type, OPT_OMIT_COLOR_EMPTY },
 221     { "help",             no_argument,       &opt_type, OPT_HELP             },
 222     { "version",          no_argument,       &opt_type, OPT_VERSION          },
 223     {  NULL,              0,                 NULL,      0                    },
 224 };
 225
 226 enum attr_type {
 227     ATTR_BOLD = 0x01,
 228     ATTR_UNDERSCORE = 0x02,
 229     ATTR_BLINK = 0x04,
 230     ATTR_REVERSE = 0x08,
 231     ATTR_CONCEALED = 0x10
 232 };
 233 struct attr {
 234     const char *name;
 235     unsigned int val;
 236     enum attr_type type;
 237 };
 238
 239 static FILE *stream;
 240 #if DEBUG
 241 static FILE *log;
 242 #endif
 243
 244 static unsigned int stacked_vars;
 245 static void **vars_list;
 246
 247 static bool clean;
 248 static bool clean_all;
 249 static bool omit_color_empty;
 250
 251 static char attr[MAX_ATTRIBUTE_CHARS + 1];
 252 static char *exclude;
 253
 254 static const char *program_name;
 255
 256 #if DEBUG
 257 static void print_tstamp (FILE *);
 258 #endif
 259 static void process_opts (int, char **);
 260 static void process_opt_attr (const char *);
 261 static void write_attr (const struct attr *, unsigned int *);
 262 static void print_hint (void);
 263 static void print_help (void);
 264 static void print_version (void);
 265 static void cleanup (void);
 266 static void free_color_names (struct color_name **);
 267 static void process_args (unsigned int, char **, char *, const struct color **, const char **, FILE **);
 268 static void process_file_arg (const char *, const char **, FILE **);
 269 static void skip_path_colors (const char *, const char *, const struct stat *);
 270 static void gather_color_names (const char *, char *, struct color_name **);
 271 static void read_print_stream (const char *, const struct color **, const char *, FILE *);
 272 static void merge_print_line (const char *, const char *, FILE *);
 273 static void complete_part_line (const char *, char **, FILE *);
 274 static bool get_next_char (char *, const char **, FILE *, bool *);
 275 static void save_char (char, char **, size_t *, size_t *);
 276 static void find_color_entries (struct color_name **, const struct color **);
 277 static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
 278 static void print_line (const char *, const struct color **, const char * const, unsigned int, bool);
 279 static void print_clean (const char *);
 280 static bool is_esc (const char *);
 281 static const char *get_end_of_esc (const char *);
 282 static const char *get_end_of_text (const char *);
 283 static void print_text (const char *, size_t);
 284 static bool gather_esc_offsets (const char *, const char **, const char **);
 285 static bool validate_esc_clean_all (const char **);
 286 static bool validate_esc_clean (int, unsigned int, unsigned int *, const char **, bool *);
 287 static bool is_reset (int, unsigned int, const char **);
 288 static bool is_attr (int, unsigned int, unsigned int, const char **);
 289 static bool is_fg_color (int, const char **);
 290 static bool is_bg_color (int, unsigned int, const char **);
 291 #if !DEBUG
 292 static void *malloc_wrap (size_t);
 293 static void *calloc_wrap (size_t, size_t);
 294 static void *realloc_wrap (void *, size_t);
 295 #else
 296 static void *malloc_wrap_debug (size_t, const char *, unsigned int);
 297 static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
 298 static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
 299 #endif
 300 static void free_wrap (void **);
 301 static char *strdup_wrap (const char *, const char *, unsigned int);
 302 static char *str_concat_wrap (const char *, const char *, const char *, unsigned int);
 303 static bool get_bytes_size (unsigned long, struct bytes_size *);
 304 static char *get_file_type (mode_t);
 305 static bool has_color_name (const char *, const char *);
 306 static FILE *open_file (const char *, const char *);
 307 static void vfprintf_diag (const char *, ...);
 308 static void vfprintf_fail (const char *, ...);
 309 static void stack_var (void ***, unsigned int *, unsigned int, void *);
 310 static void release_var (void **, unsigned int, void **);
 311
 312 extern int optind;
 313
 314 int
 315 main (int argc, char **argv)
 316 {
 317     unsigned int arg_cnt;
 318
 319     const struct color *colors[2] = {
 320         NULL, /* foreground */
 321         NULL, /* background */
 322     };
 323
 324     const char *file = NULL;
 325
 326     program_name = argv[0];
 327     atexit (cleanup);
 328
 329     setvbuf (stdout, NULL, _IOLBF, 0);
 330
 331 #if DEBUG
 332     log = open_file (DEBUG_FILE, "w");
 333     print_tstamp (log);
 334 #endif
 335
 336     attr[0] = '\0';
 337
 338     process_opts (argc, argv);
 339
 340     arg_cnt = argc - optind;
 341
 342     if (clean || clean_all)
 343       {
 344         if (clean && clean_all)
 345           vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
 346         if (arg_cnt > 1)
 347           {
 348             const char *const format = "%s %s";
 349             const char *const message = "switch cannot be used with more than one file";
 350             if (clean)
 351               vfprintf_fail (format, "--clean", message);
 352             else if (clean_all)
 353               vfprintf_fail (format, "--clean-all", message);
 354           }
 355       }
 356     else
 357       {
 358         if (arg_cnt == 0 || arg_cnt > 2)
 359           {
 360             vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
 361             print_hint ();
 362             exit (EXIT_FAILURE);
 363           }
 364       }
 365
 366     if (clean || clean_all)
 367       process_file_arg (argv[optind], &file, &stream);
 368     else
 369       process_args (arg_cnt, &argv[optind], &attr[0], colors, &file, &stream);
 370     read_print_stream (&attr[0], colors, file, stream);
 371
 372     RELEASE_VAR (exclude);
 373
 374     exit (EXIT_SUCCESS);
 375 }
 376
 377 #if DEBUG
 378 static void
 379 print_tstamp (FILE *log)
 380 {
 381     time_t t;
 382     struct tm *tm;
 383     char str[128];
 384     size_t written;
 385
 386     t = time (NULL);
 387     tm = localtime (&t);
 388     if (tm == NULL)
 389       {
 390         perror ("localtime");
 391         exit (EXIT_FAILURE);
 392       }
 393     written = strftime (str, sizeof (str), "%Y-%m-%d %H:%M:%S %Z", tm);
 394     if (written == 0)
 395       vfprintf_fail (formats[FMT_GENERIC], "strftime: 0 returned");
 396
 397     fprintf (log, "%s\n", str);
 398     while (written--)
 399       fprintf (log, "=");
 400     fprintf (log, "\n");
 401 }
 402 #endif
 403
 404 #define PRINT_HELP_EXIT() \
 405     print_help ();        \
 406     exit (EXIT_SUCCESS);
 407
 408 #define PRINT_VERSION_EXIT() \
 409     print_version ();        \
 410     exit (EXIT_SUCCESS);
 411
 412 extern char *optarg;
 413
 414 static void
 415 process_opts (int argc, char **argv)
 416 {
 417     int opt;
 418     while ((opt = getopt_long (argc, argv, "hV", long_opts, NULL)) != -1)
 419       {
 420         switch (opt)
 421           {
 422             case 0: /* long opts */
 423               switch (opt_type)
 424                 {
 425                   case OPT_ATTR:
 426                     process_opt_attr (optarg);
 427                     break;
 428                   case OPT_CLEAN:
 429                     clean = true;
 430                     break;
 431                   case OPT_CLEAN_ALL:
 432                     clean_all = true;
 433                     break;
 434                   case OPT_EXCLUDE_RANDOM: {
 435                     bool valid = false;
 436                     unsigned int i;
 437                     exclude = xstrdup (optarg);
 438                     STACK_VAR (exclude);
 439                     for (i = 1; i < tables[GENERIC].count - 1; i++) /* skip color none and default */
 440                       {
 441                         const struct color *entry = &tables[GENERIC].entries[i];
 442                         if (streq (exclude, entry->name))
 443                           {
 444                             valid = true;
 445                             break;
 446                           }
 447                       }
 448                     if (!valid)
 449                       vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain color");
 450                     break;
 451                   }
 452                   case OPT_OMIT_COLOR_EMPTY:
 453                     omit_color_empty = true;
 454                     break;
 455                   case OPT_HELP:
 456                     PRINT_HELP_EXIT ();
 457                   case OPT_VERSION:
 458                     PRINT_VERSION_EXIT ();
 459                   default: /* never reached */
 460                     ABORT_TRACE ();
 461                 }
 462               break;
 463             case 'h':
 464               PRINT_HELP_EXIT ();
 465             case 'V':
 466               PRINT_VERSION_EXIT ();
 467             case '?':
 468               print_hint ();
 469               exit (EXIT_FAILURE);
 470             default: /* never reached */
 471               ABORT_TRACE ();
 472           }
 473       }
 474 }
 475
 476 static void
 477 process_opt_attr (const char *p)
 478 {
 479     /* If attributes are added to this "list", also increase MAX_ATTRIBUTE_CHARS!  */
 480     const struct attr attrs[] = {
 481         { "bold",       1, ATTR_BOLD       },
 482         { "underscore", 4, ATTR_UNDERSCORE },
 483         { "blink",      5, ATTR_BLINK      },
 484         { "reverse",    7, ATTR_REVERSE    },
 485         { "concealed",  8, ATTR_CONCEALED  },
 486     };
 487     unsigned int attr_types = 0;
 488
 489     while (*p)
 490       {
 491         const char *s;
 492         if (!isalnum (*p))
 493           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must be provided a string");
 494         s = p;
 495         while (isalnum (*p))
 496           p++;
 497         if (*p != '\0' && *p != ',')
 498           vfprintf_fail (formats[FMT_GENERIC], "--attr switch must have strings separated by ,");
 499         else
 500           {
 501             bool valid_attr = false;
 502             unsigned int i;
 503             for (i = 0; i < COUNT_OF (attrs, struct attr); i++)
 504               {
 505                 const size_t name_len = strlen (attrs[i].name);
 506                 if ((size_t)(p - s) == name_len && strneq (s, attrs[i].name, name_len))
 507                   {
 508                     write_attr (&attrs[i], &attr_types);
 509                     valid_attr = true;
 510                     break;
 511                   }
 512               }
 513             if (!valid_attr)
 514               {
 515                 char *attr_invalid = xmalloc ((p - s) + 1);
 516                 STACK_VAR (attr_invalid);
 517                 strncpy (attr_invalid, s, p - s);
 518                 attr_invalid[p - s] = '\0';
 519                 vfprintf_fail ("--attr switch attribute '%s' is not valid", attr_invalid);
 520                 RELEASE_VAR (attr_invalid); /* never reached */
 521               }
 522           }
 523         if (*p)
 524           p++;
 525       }
 526 }
 527
 528 static void
 529 write_attr (const struct attr *attr_i, unsigned int *attr_types)
 530 {
 531     const unsigned int val = attr_i->val;
 532     const enum attr_type attr_type = attr_i->type;
 533     const char *attr_name = attr_i->name;
 534
 535     if (*attr_types & attr_type)
 536       vfprintf_fail ("--attr switch has attribute '%s' twice or more", attr_name);
 537     snprintf (attr + strlen (attr), 3, "%u;", val);
 538     *attr_types |= attr_type;
 539 }
 540
 541 static void
 542 print_hint (void)
 543 {
 544     fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
 545 }
 546
 547 static void
 548 print_help (void)
 549 {
 550     struct opt_data {
 551         const char *name;
 552         const char *short_opt;
 553         const char *arg;
 554     };
 555     const struct opt_data opts_data[] = {
 556         { "attr",           NULL, "=ATTR1,ATTR2,..." },
 557         { "exclude-random", NULL, "=COLOR"           },
 558         { "help",           "h",  NULL               },
 559         { "version",        "V",  NULL               },
 560     };
 561     const struct option *opt = long_opts;
 562     unsigned int i;
 563
 564     printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
 565     printf ("\tColors (foreground) (background)\n");
 566     for (i = 0; i < tables[FOREGROUND].count; i++)
 567       {
 568         const struct color *entry = &tables[FOREGROUND].entries[i];
 569         const char *name = entry->name;
 570         const char *code = entry->code;
 571         if (code)
 572           printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
 573                    code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
 574         else
 575           printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
 576       }
 577     printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");
 578
 579     printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
 580     printf ("\twhereas for lower case colors will be of normal intensity.\n");
 581
 582     printf ("\n\tOptions\n");
 583     for (; opt->name; opt++)
 584       {
 585         const struct opt_data *opt_data = NULL;
 586         unsigned int i;
 587         for (i = 0; i < COUNT_OF (opts_data, struct opt_data); i++)
 588           if (streq (opt->name, opts_data[i].name))
 589             {
 590               opt_data = &opts_data[i];
 591               break;
 592             }
 593         if (opt_data)
 594           {
 595             if (opt_data->short_opt)
 596               printf ("\t\t-%s, --%s\n", opt_data->short_opt, opt->name);
 597             else
 598               printf ("\t\t    --%s%s\n", opt->name, opt_data->arg);
 599           }
 600         else
 601           printf ("\t\t    --%s\n", opt->name);
 602       }
 603     printf ("\n");
 604 }
 605
 606 static void
 607 print_version (void)
 608 {
 609 #ifdef HAVE_VERSION
 610 # include "version.h"
 611 #else
 612     const char *const version = NULL;
 613 #endif
 614     const char *version_prefix, *version_string;
 615     const char *c_flags, *ld_flags, *cpp_flags;
 616     const char *const desc_flags_unknown = "unknown";
 617     struct bytes_size bytes_size;
 618     bool debug;
 619 #ifdef CFLAGS
 620     c_flags = to_str (CFLAGS);
 621 #else
 622     c_flags = desc_flags_unknown;
 623 #endif
 624 #ifdef LDFLAGS
 625     ld_flags = to_str (LDFLAGS);
 626 #else
 627     ld_flags = desc_flags_unknown;
 628 #endif
 629 #ifdef CPPFLAGS
 630     cpp_flags = to_str (CPPFLAGS);
 631 #else
 632     cpp_flags = desc_flags_unknown;
 633 #endif
 634 #if DEBUG
 635     debug = true;
 636 #else
 637     debug = false;
 638 #endif
 639     version_prefix = version ? "" : "v";
 640     version_string = version ? version : VERSION;
 641     printf ("%s %s%s (compiled at %s, %s)\n", PROGRAM_NAME, version_prefix, version_string, __DATE__, __TIME__);
 642
 643     printf ("Compiler flags: %s\n", c_flags);
 644     printf ("Linker flags: %s\n", ld_flags);
 645     printf ("Preprocessor flags: %s\n", cpp_flags);
 646     if (get_bytes_size (BUF_SIZE, &bytes_size))
 647       {
 648         if (BUF_SIZE % 1024 == 0)
 649           printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
 650         else
 651           printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
 652                    BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
 653       }
 654     else
 655       printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
 656     printf ("Color separator: '%c'\n", COLOR_SEP_CHAR);
 657     printf ("Debugging: %s\n", debug ? "yes" : "no");
 658 }
 659
 660 static void
 661 cleanup (void)
 662 {
 663     if (stream && fileno (stream) != STDIN_FILENO)
 664       fclose (stream);
 665 #if DEBUG
 666     if (log)
 667       fclose (log);
 668 #endif
 669
 670     if (vars_list)
 671       {
 672         unsigned int i;
 673         for (i = 0; i < stacked_vars; i++)
 674           free (vars_list[i]);
 675         free_null (vars_list);
 676       }
 677 }
 678
 679 static void
 680 free_color_names (struct color_name **color_names)
 681 {
 682     unsigned int i;
 683     for (i = 0; color_names[i]; i++)
 684       {
 685         RELEASE_VAR (color_names[i]->name);
 686         RELEASE_VAR (color_names[i]->orig);
 687         RELEASE_VAR (color_names[i]);
 688       }
 689 }
 690
 691 static void
 692 process_args (unsigned int arg_cnt, char **arg_strings, char *attr, const struct color **colors, const char **file, FILE **stream)
 693 {
 694     int ret;
 695     char *p;
 696     struct stat sb;
 697     struct color_name *color_names[3] = {
 698         NULL, /* foreground */
 699         NULL, /* background */
 700         NULL, /* sentinel value */
 701     };
 702
 703     const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
 704     const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;
 705
 706     assert (color_string != NULL);
 707
 708     if (streq (color_string, "-"))
 709       {
 710         if (file_string)
 711           vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
 712         else
 713           vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceded by color string");
 714       }
 715
 716     ret = lstat (color_string, &sb);
 717
 718     /* Ensure that we don't fail if there's a file with one or more
 719        color names in its path.  */
 720     if (ret == 0) /* success */
 721       skip_path_colors (color_string, file_string, &sb);
 722
 723     if ((p = strchr (color_string, COLOR_SEP_CHAR)))
 724       {
 725         if (p == color_string)
 726           vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
 727         else if (p == color_string + strlen (color_string) - 1)
 728           vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
 729         else if (strchr (++p, COLOR_SEP_CHAR))
 730           vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
 731       }
 732
 733     gather_color_names (color_string, attr, color_names);
 734
 735     assert (color_names[FOREGROUND] != NULL);
 736
 737     if (color_names[BACKGROUND])
 738       {
 739         unsigned int i;
 740         const unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
 741         for (i = 0; i < 2; i++)
 742           {
 743             const unsigned int color1 = color_sets[i][0];
 744             const unsigned int color2 = color_sets[i][1];
 745             if (CHECK_COLORS_RANDOM (color1, color2))
 746               vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
 747           }
 748       }
 749
 750     find_color_entries (color_names, colors);
 751     assert (colors[FOREGROUND] != NULL);
 752     free_color_names (color_names);
 753
 754     if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
 755       {
 756         struct color_name color_name;
 757         color_name.name = color_name.orig = "default";
 758
 759         find_color_entry (&color_name, FOREGROUND, colors);
 760         assert (colors[FOREGROUND]->code != NULL);
 761       }
 762
 763     process_file_arg (file_string, file, stream);
 764 }
 765
 766 static void
 767 process_file_arg (const char *file_string, const char **file, FILE **stream)
 768 {
 769     if (file_string)
 770       {
 771         if (streq (file_string, "-"))
 772           *stream = stdin;
 773         else
 774           {
 775             const char *file = file_string;
 776             struct stat sb;
 777             int ret;
 778
 779             errno = 0;
 780             ret = stat (file, &sb);
 781
 782             if (ret == -1)
 783               vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
 784
 785             if (!VALID_FILE_TYPE (sb.st_mode))
 786               vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));
 787
 788             *stream = open_file (file, "r");
 789           }
 790         *file = file_string;
 791       }
 792     else
 793       {
 794         *stream = stdin;
 795         *file = "stdin";
 796       }
 797
 798     assert (*stream != NULL);
 799     assert (*file != NULL);
 800 }
 801
 802 static void
 803 skip_path_colors (const char *color_string, const char *file_string, const struct stat *sb)
 804 {
 805     bool have_file;
 806     unsigned int c;
 807     const char *color = color_string;
 808     const mode_t mode = sb->st_mode;
 809
 810     for (c = 1; c <= 2 && *color; c++)
 811       {
 812         bool matched = false;
 813         unsigned int i;
 814         for (i = 0; i < tables[GENERIC].count; i++)
 815           {
 816             const struct color *entry = &tables[GENERIC].entries[i];
 817             if (has_color_name (color, entry->name))
 818               {
 819                 color += strlen (entry->name);
 820                 matched = true;
 821                 break;
 822               }
 823           }
 824         if (!matched && has_color_name (color, "random"))
 825           {
 826             color += strlen ("random");
 827             matched = true;
 828           }
 829         if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
 830           color++;
 831         else
 832           break;
 833       }
 834
 835     have_file = (*color != '\0');
 836
 837     if (have_file)
 838       {
 839         const char *file_existing = color_string;
 840         if (file_string)
 841           vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "cannot be used as color string");
 842         else
 843           {
 844             if (VALID_FILE_TYPE (mode))
 845               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "must be preceded by color string");
 846             else
 847               vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_existing, "is not a valid file type");
 848           }
 849       }
 850 }
 851
 852 static void
 853 gather_color_names (const char *color_string, char *attr, struct color_name **color_names)
 854 {
 855     unsigned int index;
 856     char *color, *p, *str;
 857
 858     str = xstrdup (color_string);
 859     STACK_VAR (str);
 860
 861     for (index = 0, color = str; *color; index++, color = p)
 862       {
 863         char *ch, *sep;
 864
 865         p = NULL;
 866         if ((sep = strchr (color, COLOR_SEP_CHAR)))
 867           {
 868             *sep = '\0';
 869             p = sep + 1;
 870           }
 871         else
 872           p = color + strlen (color);
 873         assert (p != NULL);
 874
 875         for (ch = color; *ch; ch++)
 876           if (!isalpha (*ch))
 877             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");
 878
 879         for (ch = color + 1; *ch; ch++)
 880           if (!islower (*ch))
 881             vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");
 882
 883         if (streq (color, "None"))
 884           vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");
 885
 886         if (isupper (*color))
 887           {
 888             switch (index)
 889               {
 890                 case FOREGROUND:
 891                   snprintf (attr + strlen (attr), 3, "1;");
 892                   break;
 893                 case BACKGROUND:
 894                   vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
 895                 default: /* never reached */
 896                   ABORT_TRACE ();
 897               }
 898           }
 899
 900         color_names[index] = xcalloc (1, sizeof (struct color_name));
 901         STACK_VAR (color_names[index]);
 902
 903         color_names[index]->orig = xstrdup (color);
 904         STACK_VAR (color_names[index]->orig);
 905
 906         for (ch = color; *ch; ch++)
 907           *ch = tolower (*ch);
 908
 909         color_names[index]->name = xstrdup (color);
 910         STACK_VAR (color_names[index]->name);
 911       }
 912
 913     RELEASE_VAR (str);
 914 }
 915
 916 static void
 917 read_print_stream (const char *attr, const struct color **colors, const char *file, FILE *stream)
 918 {
 919     char buf[BUF_SIZE + 1];
 920     unsigned int flags = 0;
 921
 922     while (!feof (stream))
 923       {
 924         size_t bytes_read;
 925         char *eol;
 926         const char *line;
 927         bytes_read = fread (buf, 1, BUF_SIZE, stream);
 928         if (bytes_read != BUF_SIZE && ferror (stream))
 929           vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
 930         buf[bytes_read] = '\0';
 931         line = buf;
 932         while ((eol = strpbrk (line, "\n\r")))
 933           {
 934             const bool has_text = (eol > line);
 935             const char *p;
 936             flags &= ~(CR|LF);
 937             if (*eol == '\r')
 938               {
 939                 flags |= CR;
 940                 if (*(eol + 1) == '\n')
 941                   flags |= LF;
 942               }
 943             else if (*eol == '\n')
 944               flags |= LF;
 945             else /* never reached */
 946               vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
 947             p = eol + SKIP_LINE_ENDINGS (flags);
 948             *eol = '\0';
 949             print_line (attr, colors, line, flags,
 950                         omit_color_empty ? has_text : true);
 951             line = p;
 952           }
 953         if (feof (stream))
 954           {
 955             if (*line != '\0')
 956               print_line (attr, colors, line, 0, true);
 957           }
 958         else if (*line != '\0')
 959           {
 960             char *p;
 961             if ((clean || clean_all) && (p = strrchr (line, '\033')))
 962               merge_print_line (line, p, stream);
 963             else
 964               print_line (attr, colors, line, 0, true);
 965           }
 966       }
 967 }
 968
 969 static void
 970 merge_print_line (const char *line, const char *p, FILE *stream)
 971 {
 972     char *buf = NULL;
 973     char *merged_esc = NULL;
 974     const char *esc = "";
 975     const char char_restore = *p;
 976
 977     complete_part_line (p + 1, &buf, stream);
 978
 979     if (buf)
 980       {
 981         /* form escape sequence */
 982         esc = merged_esc = str_concat (p, buf);
 983         /* shorten partial line accordingly */
 984         *(char *)p = '\0';
 985         free (buf);
 986       }
 987
 988 #ifdef TEST_MERGE_PART_LINE
 989     printf ("%s%s", line, esc);
 990     fflush (stdout);
 991     _exit (EXIT_SUCCESS);
 992 #else
 993     print_clean (line);
 994     *(char *)p = char_restore;
 995     print_clean (esc);
 996     free (merged_esc);
 997 #endif
 998 }
 999
1000 static void
1001 complete_part_line (const char *p, char **buf, FILE *stream)
1002 {
1003     bool got_next_char = false, read_from_stream;
1004     char ch;
1005     size_t i = 0, size;
1006
1007     if (get_next_char (&ch, &p, stream, &read_from_stream))
1008       {
1009         if (ch == '[')
1010           {
1011             if (read_from_stream)
1012               save_char (ch, buf, &i, &size);
1013           }
1014         else
1015           {
1016             if (read_from_stream)
1017               ungetc ((int)ch, stream);
1018             return; /* cancel */
1019           }
1020       }
1021     else
1022       return; /* cancel */
1023
1024     while (get_next_char (&ch, &p, stream, &read_from_stream))
1025       {
1026         if (isdigit (ch) || ch == ';')
1027           {
1028             if (read_from_stream)
1029               save_char (ch, buf, &i, &size);
1030           }
1031         else /* got next character */
1032           {
1033             got_next_char = true;
1034             break;
1035           }
1036       }
1037
1038     if (got_next_char)
1039       {
1040         if (ch == 'm')
1041           {
1042             if (read_from_stream)
1043               save_char (ch, buf, &i, &size);
1044           }
1045         else
1046           {
1047             if (read_from_stream)
1048               ungetc ((int)ch, stream);
1049             return; /* cancel */
1050           }
1051       }
1052     else
1053       return; /* cancel */
1054 }
1055
1056 static bool
1057 get_next_char (char *ch, const char **p, FILE *stream, bool *read_from_stream)
1058 {
1059     if (**p == '\0')
1060       {
1061         int c;
1062         if ((c = fgetc (stream)) != EOF)
1063           {
1064             *ch = (char)c;
1065             *read_from_stream = true;
1066             return true;
1067           }
1068         else
1069           {
1070             *read_from_stream = false;
1071             return false;
1072           }
1073       }
1074     else
1075       {
1076         *ch = **p;
1077         (*p)++;
1078         *read_from_stream = false;
1079         return true;
1080       }
1081 }
1082
1083 static void
1084 save_char (char ch, char **buf, size_t *i, size_t *size)
1085 {
1086     if (!*buf)
1087       {
1088         *size = ALLOC_COMPLETE_PART_LINE;
1089         *buf = xmalloc (*size);
1090       }
1091     /* +1: effective occupied size of buffer */
1092     else if ((*i + 1) == *size)
1093       {
1094         *size *= 2;
1095         *buf = xrealloc (*buf, *size);
1096       }
1097     (*buf)[*i] = ch;
1098     (*buf)[*i + 1] = '\0';
1099     (*i)++;
1100 }
1101
1102 static void
1103 find_color_entries (struct color_name **color_names, const struct color **colors)
1104 {
1105     struct timeval tv;
1106     unsigned int index;
1107
1108     /* randomness */
1109     gettimeofday (&tv, NULL);
1110     srand (tv.tv_usec * tv.tv_sec);
1111
1112     for (index = 0; color_names[index]; index++)
1113       {
1114         const char *color_name = color_names[index]->name;
1115
1116         const unsigned int count                = tables[index].count;
1117         const struct color *const color_entries = tables[index].entries;
1118
1119         if (streq (color_name, "random"))
1120           {
1121             bool excludable;
1122             unsigned int i;
1123             do {
1124               excludable = false;
1125               i = rand() % (count - 2) + 1; /* omit color none and default */
1126               switch (index)
1127                 {
1128                   case FOREGROUND:
1129                     /* --exclude-random */
1130                     if (exclude && streq (exclude, color_entries[i].name))
1131                       excludable = true;
1132                     else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
1133                       excludable = true;
1134                     break;
1135                   case BACKGROUND:
1136                     if (streq (colors[FOREGROUND]->name, color_entries[i].name))
1137                       excludable = true;
1138                     break;
1139                   default: /* never reached */
1140                     ABORT_TRACE ();
1141                  }
1142             } while (excludable);
1143             colors[index] = (struct color *)&color_entries[i];
1144           }
1145         else
1146           find_color_entry (color_names[index], index, colors);
1147       }
1148 }
1149
1150 static void
1151 find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
1152 {
1153     bool found = false;
1154     unsigned int i;
1155
1156     const unsigned int count                = tables[index].count;
1157     const struct color *const color_entries = tables[index].entries;
1158
1159     for (i = 0; i < count; i++)
1160       if (streq (color_name->name, color_entries[i].name))
1161         {
1162           colors[index] = (struct color *)&color_entries[i];
1163           found = true;
1164           break;
1165         }
1166     if (!found)
1167       vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
1168 }
1169
1170 static void
1171 print_line (const char *attr, const struct color **colors, const char *const line, unsigned int flags, bool emit_colors)
1172 {
1173     /* --clean[-all] */
1174     if (clean || clean_all)
1175       print_clean (line);
1176     /* skip for --omit-color-empty? */
1177     else if (emit_colors)
1178       {
1179         /* Foreground color code is guaranteed to be set when background color code is present.  */
1180         if (colors[BACKGROUND] && colors[BACKGROUND]->code)
1181           printf ("\033[%s", colors[BACKGROUND]->code);
1182         if (colors[FOREGROUND]->code)
1183           printf ("\033[%s%s%s\033[0m", attr, colors[FOREGROUND]->code, line);
1184         else
1185           printf (formats[FMT_GENERIC], line);
1186       }
1187     if (flags & CR)
1188       putchar ('\r');
1189     if (flags & LF)
1190       putchar ('\n');
1191 }
1192
1193 static void
1194 print_clean (const char *line)
1195 {
1196     const char *p = line;
1197
1198     if (is_esc (p))
1199       p = get_end_of_esc (p);
1200
1201     while (*p != '\0')
1202       {
1203         const char *text_start = p;
1204         const char *text_end = get_end_of_text (p);
1205         print_text (text_start, text_end - text_start);
1206         p = get_end_of_esc (text_end);
1207       }
1208 }
1209
1210 static bool
1211 is_esc (const char *p)
1212 {
1213     return gather_esc_offsets (p, NULL, NULL);
1214 }
1215
1216 static const char *
1217 get_end_of_esc (const char *p)
1218 {
1219     const char *esc;
1220     const char *end = NULL;
1221     while ((esc = strchr (p, '\033')))
1222       {
1223         if (gather_esc_offsets (esc, NULL, &end))
1224           break;
1225         p = esc + 1;
1226       }
1227     return end ? end + 1 : p + strlen (p);
1228 }
1229
1230 static const char *
1231 get_end_of_text (const char *p)
1232 {
1233     const char *esc;
1234     const char *start = NULL;
1235     while ((esc = strchr (p, '\033')))
1236       {
1237         if (gather_esc_offsets (esc, &start, NULL))
1238           break;
1239         p = esc + 1;
1240       }
1241     return start ? start : p + strlen (p);
1242 }
1243
1244 static void
1245 print_text (const char *p, size_t len)
1246 {
1247     size_t bytes_written;
1248     bytes_written = fwrite (p, 1, len, stdout);
1249     if (bytes_written != len)
1250       vfprintf_fail (formats[FMT_ERROR], (unsigned long)len, "written");
1251 }
1252
1253 static bool
1254 gather_esc_offsets (const char *p, const char **start, const char **end)
1255 {
1256     /* ESC[ */
1257     if (*p == 27 && *(p + 1) == '[')
1258       {
1259         bool valid = false;
1260         const char *const begin = p;
1261         p += 2;
1262         if (clean_all)
1263           valid = validate_esc_clean_all (&p);
1264         else if (clean)
1265           {
1266             bool check_values;
1267             unsigned int prev_iter, iter;
1268             const char *digit;
1269             prev_iter = iter = 0;
1270             do {
1271               check_values = false;
1272               iter++;
1273               if (!isdigit (*p))
1274                 break;
1275               digit = p;
1276               while (isdigit (*p))
1277                 p++;
1278               if (p - digit > 2)
1279                 break;
1280               else /* check range */
1281                 {
1282                   char val[3];
1283                   int value;
1284                   unsigned int i;
1285                   const unsigned int digits = p - digit;
1286                   for (i = 0; i < digits; i++)
1287                     val[i] = *digit++;
1288                   val[i] = '\0';
1289                   value = atoi (val);
1290                   valid = validate_esc_clean (value, iter, &prev_iter, &p, &check_values);
1291                 }
1292             } while (check_values);
1293           }
1294         if (valid)
1295           {
1296             if (start)
1297               *start = begin;
1298             if (end)
1299               *end = p;
1300             return true;
1301           }
1302       }
1303     return false;
1304 }
1305
1306 static bool
1307 validate_esc_clean_all (const char **p)
1308 {
1309     while (isdigit (**p) || **p == ';')
1310       (*p)++;
1311     return (**p == 'm');
1312 }
1313
1314 static bool
1315 validate_esc_clean (int value, unsigned int iter, unsigned int *prev_iter, const char **p, bool *check_values)
1316 {
1317     if (is_reset (value, iter, p))
1318       return true;
1319     else if (is_attr (value, iter, *prev_iter, p))
1320       {
1321         (*p)++;
1322         *check_values = true;
1323         *prev_iter = iter;
1324         return false; /* partial escape sequence, need another valid value */
1325       }
1326     else if (is_fg_color (value, p))
1327       return true;
1328     else if (is_bg_color (value, iter, p))
1329       return true;
1330     else
1331       return false;
1332 }
1333
1334 static bool
1335 is_reset (int value, unsigned int iter, const char **p)
1336 {
1337     return (value == 0 && iter == 1 && **p == 'm');
1338 }
1339
1340 static bool
1341 is_attr (int value, unsigned int iter, unsigned int prev_iter, const char **p)
1342 {
1343     return ((value > 0 && value < 10) && (iter - prev_iter == 1) && **p == ';');
1344 }
1345
1346 static bool
1347 is_fg_color (int value, const char **p)
1348 {
1349     return (((value >= 30 && value <= 37) || value == 39) && **p == 'm');
1350 }
1351
1352 static bool
1353 is_bg_color (int value, unsigned int iter, const char **p)
1354 {
1355     return (((value >= 40 && value <= 47) || value == 49) && iter == 1 && **p == 'm');
1356 }
1357
1358 #if !DEBUG
1359 static void *
1360 malloc_wrap (size_t size)
1361 {
1362     void *p = malloc (size);
1363     if (!p)
1364       MEM_ALLOC_FAIL ();
1365     return p;
1366 }
1367
1368 static void *
1369 calloc_wrap (size_t nmemb, size_t size)
1370 {
1371     void *p = calloc (nmemb, size);
1372     if (!p)
1373       MEM_ALLOC_FAIL ();
1374     return p;
1375 }
1376
1377 static void *
1378 realloc_wrap (void *ptr, size_t size)
1379 {
1380     void *p = realloc (ptr, size);
1381     if (!p)
1382       MEM_ALLOC_FAIL ();
1383     return p;
1384 }
1385 #else
1386 static const char *const format_debug = "%s: %10s %7lu bytes [source file %s, line %5u]\n";
1387 static void *
1388 malloc_wrap_debug (size_t size, const char *file, unsigned int line)
1389 {
1390     void *p = malloc (size);
1391     if (!p)
1392       MEM_ALLOC_FAIL_DEBUG (file, line);
1393     fprintf (log, format_debug, program_name, "malloc'ed", (unsigned long)size, file, line);
1394     return p;
1395 }
1396
1397 static void *
1398 calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
1399 {
1400     void *p = calloc (nmemb, size);
1401     if (!p)
1402       MEM_ALLOC_FAIL_DEBUG (file, line);
1403     fprintf (log, format_debug, program_name, "calloc'ed", (unsigned long)(nmemb * size), file, line);
1404     return p;
1405 }
1406
1407 static void *
1408 realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
1409 {
1410     void *p = realloc (ptr, size);
1411     if (!p)
1412       MEM_ALLOC_FAIL_DEBUG (file, line);
1413     fprintf (log, format_debug, program_name, "realloc'ed", (unsigned long)size, file, line);
1414     return p;
1415 }
1416 #endif /* !DEBUG */
1417
1418 static void
1419 free_wrap (void **ptr)
1420 {
1421     free (*ptr);
1422     *ptr = NULL;
1423 }
1424
1425 #if !DEBUG
1426 # define do_malloc(len, file, line) malloc_wrap(len)
1427 #else
1428 # define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
1429 #endif
1430
1431 static char *
1432 strdup_wrap (const char *str, const char *file, unsigned int line)
1433 {
1434     const size_t len = strlen (str) + 1;
1435     char *p = do_malloc (len, file, line);
1436     strncpy (p, str, len);
1437     return p;
1438 }
1439
1440 static char *
1441 str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
1442 {
1443     const size_t len = strlen (str1) + strlen (str2) + 1;
1444     char *p, *str;
1445
1446     p = str = do_malloc (len, file, line);
1447     strncpy (p, str1, strlen (str1));
1448     p += strlen (str1);
1449     strncpy (p, str2, strlen (str2));
1450     p += strlen (str2);
1451     *p = '\0';
1452
1453     return str;
1454 }
1455
1456 static bool
1457 get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
1458 {
1459     const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
1460     unsigned long size = bytes;
1461     if (bytes < 1024)
1462       return false;
1463     unit = units;
1464     while (size >= 1024 && *(unit + 1))
1465       {
1466         size /= 1024;
1467         unit++;
1468       }
1469     bytes_size->size = (unsigned int)size;
1470     bytes_size->unit = *unit;
1471     return true;
1472 }
1473
1474 static char *
1475 get_file_type (mode_t mode)
1476 {
1477     if (S_ISREG (mode))
1478       return "file";
1479     else if (S_ISDIR (mode))
1480       return "directory";
1481     else if (S_ISCHR (mode))
1482       return "character device";
1483     else if (S_ISBLK (mode))
1484       return "block device";
1485     else if (S_ISFIFO (mode))
1486       return "named pipe";
1487     else if (S_ISLNK (mode))
1488       return "symbolic link";
1489     else if (S_ISSOCK (mode))
1490       return "socket";
1491     else
1492       return "file";
1493 }
1494
1495 static bool
1496 has_color_name (const char *str, const char *name)
1497 {
1498     char *p;
1499
1500     assert (strlen (str) > 0);
1501     assert (strlen (name) > 0);
1502
1503     if (!(*str == *name || *str == toupper (*name)))
1504       return false;
1505     else if (*(name + 1) != '\0'
1506      && !((p = strstr (str + 1, name + 1)) && p == str + 1))
1507       return false;
1508     else
1509       return true;
1510 }
1511
1512 static FILE *
1513 open_file (const char *file, const char *mode)
1514 {
1515     FILE *stream;
1516
1517     errno = 0;
1518     stream = fopen (file, mode);
1519     if (!stream)
1520       vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
1521
1522     return stream;
1523 }
1524
1525 #define DO_VFPRINTF(fmt)                    \
1526     va_list ap;                             \
1527     fprintf (stderr, "%s: ", program_name); \
1528     va_start (ap, fmt);                     \
1529     vfprintf (stderr, fmt, ap);             \
1530     va_end (ap);                            \
1531     fprintf (stderr, "\n");
1532
1533 static void
1534 vfprintf_diag (const char *fmt, ...)
1535 {
1536     DO_VFPRINTF (fmt);
1537 }
1538
1539 static void
1540 vfprintf_fail (const char *fmt, ...)
1541 {
1542     DO_VFPRINTF (fmt);
1543     exit (EXIT_FAILURE);
1544 }
1545
1546 static void
1547 stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
1548 {
1549     /* nothing to stack */
1550     if (ptr == NULL)
1551       return;
1552     if (!*list)
1553       *list = xmalloc (sizeof (void *));
1554     else
1555       {
1556         unsigned int i;
1557         for (i = 0; i < *stacked; i++)
1558           if (!(*list)[i])
1559             {
1560               (*list)[i] = ptr;
1561               return; /* reused */
1562             }
1563         *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
1564       }
1565     (*list)[index] = ptr;
1566     (*stacked)++;
1567 }
1568
1569 static void
1570 release_var (void **list, unsigned int stacked, void **ptr)
1571 {
1572     unsigned int i;
1573     /* nothing to release */
1574     if (*ptr == NULL)
1575       return;
1576     for (i = 0; i < stacked; i++)
1577       if (list[i] == *ptr)
1578         {
1579           free (*ptr);
1580           *ptr = NULL;
1581           list[i] = NULL;
1582           return;
1583         }
1584 }