/*
 * colorize - Read text from standard input stream or file and print
 *            it colorized through use of ANSI escape sequences
 *
 * Copyright (c) 2011-2014 Steven Schubiger
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#define _BSD_SOURCE
#define _XOPEN_SOURCE 700
#define _FILE_OFFSET_BITS 64
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>

#ifndef DEBUG
# define DEBUG 0
#endif

#define str(arg) #arg
#define to_str(arg) str(arg)

#define streq(s1, s2) (strcmp (s1, s2) == 0)

#if !DEBUG
# define xmalloc(size)          malloc_wrap(size)
# define xcalloc(nmemb, size)   calloc_wrap(nmemb, size)
# define xrealloc(ptr, size)    realloc_wrap(ptr, size)
# define xstrdup(str)           strdup_wrap(str,            NULL, 0)
# define str_concat(str1, str2) str_concat_wrap(str1, str2, NULL, 0)
#else
# define xmalloc(size)          malloc_wrap_debug(size,        __FILE__, __LINE__)
# define xcalloc(nmemb, size)   calloc_wrap_debug(nmemb, size, __FILE__, __LINE__)
# define xrealloc(ptr, size)    realloc_wrap_debug(ptr, size,  __FILE__, __LINE__)
# define xstrdup(str)           strdup_wrap(str,               __FILE__, __LINE__)
# define str_concat(str1, str2) str_concat_wrap(str1, str2,    __FILE__, __LINE__)
#endif

#define free_null(ptr) free_wrap((void **)&ptr)

#if defined(BUF_SIZE) && (BUF_SIZE <= 0 || BUF_SIZE > 65536)
# undef BUF_SIZE
#endif
#ifndef BUF_SIZE
# define BUF_SIZE 4096
#endif

#define LF 0x01
#define CR 0x02

#define SKIP_LINE_ENDINGS(flags) (((flags) & CR) && ((flags) & LF) ? 2 : 1)

#define VALID_FILE_TYPE(mode) (S_ISREG (mode) || S_ISLNK (mode) || S_ISFIFO (mode))

#define STACK_VAR(ptr) do {                                   \
    stack_var (&vars_list, &stacked_vars, stacked_vars, ptr); \
} while (false)

#define RELEASE_VAR(ptr) do {                             \
    release_var (vars_list, stacked_vars, (void **)&ptr); \
} while (false)

#if !DEBUG
# define MEM_ALLOC_FAIL() do {                                         \
    fprintf (stderr, "%s: memory allocation failure\n", program_name); \
    exit (EXIT_FAILURE);                                               \
} while (false)
#else
# define MEM_ALLOC_FAIL_DEBUG(file, line) do {                                              \
    fprintf (stderr, "Memory allocation failure in source file %s, line %u\n", file, line); \
    exit (EXIT_FAILURE);                                                                    \
} while (false)
#endif

#define ABORT_TRACE()                                                              \
    fprintf (stderr, "Aborting in source file %s, line %u\n", __FILE__, __LINE__); \
    abort ();                                                                      \

#define CHECK_COLORS_RANDOM(color1, color2)        \
     streq (color_names[color1]->name, "random")   \
 && (streq (color_names[color2]->name, "none")     \
  || streq (color_names[color2]->name, "default")) \

#define COLOR_SEP_CHAR '/'

#define DEBUG_FILE "debug.txt"

#define VERSION "0.54"

typedef enum { false, true } bool;

struct color_name {
    char *name;
    char *orig;
};

static struct color_name *color_names[3] = { NULL, NULL, NULL };

struct color {
    const char *name;
    const char *code;
};

static const struct color fg_colors[] = {
    { "none",     NULL },
    { "black",   "30m" },
    { "red",     "31m" },
    { "green",   "32m" },
    { "yellow",  "33m" },
    { "blue",    "34m" },
    { "magenta", "35m" },
    { "cyan",    "36m" },
    { "white",   "37m" },
    { "default", "39m" },
};
static const struct color bg_colors[] = {
    { "none",     NULL },
    { "black",   "40m" },
    { "red",     "41m" },
    { "green",   "42m" },
    { "yellow",  "43m" },
    { "blue",    "44m" },
    { "magenta", "45m" },
    { "cyan",    "46m" },
    { "white",   "47m" },
    { "default", "49m" },
};

struct bytes_size {
    unsigned int size;
    char unit;
};

enum fmts {
    FMT_GENERIC,
    FMT_STRING,
    FMT_QUOTE,
    FMT_COLOR,
    FMT_RANDOM,
    FMT_ERROR,
    FMT_FILE,
    FMT_TYPE
};
static const char *formats[] = {
    "%s",                    /* generic */
    "%s '%s'",               /* string  */
    "%s `%s' %s",            /* quote   */
    "%s color '%s' %s",      /* color   */
    "%s color '%s' %s '%s'", /* random  */
    "less than %u bytes %s", /* error   */
    "%s: %s",                /* file    */
    "%s: %s: %s",            /* type    */
};

enum { FOREGROUND, BACKGROUND };

static const struct {
    struct color const *entries;
    unsigned int count;
    const char *desc;
} tables[] = {
    { fg_colors, sizeof (fg_colors) / sizeof (struct color), "foreground" },
    { bg_colors, sizeof (bg_colors) / sizeof (struct color), "background" },
};

static FILE *stream = NULL;
#if DEBUG
static FILE *log = NULL;
#endif

static unsigned int stacked_vars = 0;
static void **vars_list = NULL;

static bool clean = false;
static bool clean_all = false;

static char *exclude = NULL;

static const char *program_name;

static void print_hint (void);
static void print_help (void);
static void print_version (void);
static void cleanup (void);
static void free_color_names (struct color_name **);
static void process_args (unsigned int, char **, bool *, const struct color **, const char **, FILE **);
static void process_file_arg (const char *, const char **, FILE **);
static void read_print_stream (bool, const struct color **, const char *, FILE *);
static void find_color_entries (struct color_name **, const struct color **);
static void find_color_entry (const struct color_name *, unsigned int, const struct color **);
static void print_line (bool, const struct color **, const char * const, unsigned int);
static void print_clean (const char *);
static void print_free_offsets (const char *, char ***, unsigned int);
#if !DEBUG
static void *malloc_wrap (size_t);
static void *calloc_wrap (size_t, size_t);
static void *realloc_wrap (void *, size_t);
#else
static void *malloc_wrap_debug (size_t, const char *, unsigned int);
static void *calloc_wrap_debug (size_t, size_t, const char *, unsigned int);
static void *realloc_wrap_debug (void *, size_t, const char *, unsigned int);
#endif
static void free_wrap (void **);
static char *strdup_wrap (const char *, const char *, unsigned int);
static char *str_concat_wrap (const char *, const char *, const char *, unsigned int);
static bool get_bytes_size (unsigned long, struct bytes_size *);
static char *get_file_type (mode_t);
static bool has_color_name (const char *, const char *);
static FILE *open_file (const char *, const char *);
static void vfprintf_diag (const char *, ...);
static void vfprintf_fail (const char *, ...);
static void stack_var (void ***, unsigned int *, unsigned int, void *);
static void release_var (void **, unsigned int, void **);

#define SET_OPT_TYPE(type) \
    opt_type = type;       \
    opt = 0;               \
    goto PARSE_OPT;        \

extern char *optarg;
extern int optind;

static int opt_type = 0;

int
main (int argc, char **argv)
{
    unsigned int arg_cnt = 0;

    enum {
        OPT_CLEAN = 1,
        OPT_CLEAN_ALL,
        OPT_EXCLUDE_RANDOM,
        OPT_HELP,
        OPT_VERSION
    };

    int opt;
    struct option long_opts[] = {
        { "clean",          no_argument,       &opt_type, OPT_CLEAN          },
        { "clean-all",      no_argument,       &opt_type, OPT_CLEAN_ALL      },
        { "exclude-random", required_argument, &opt_type, OPT_EXCLUDE_RANDOM },
        { "help",           no_argument,       &opt_type, OPT_HELP           },
        { "version",        no_argument,       &opt_type, OPT_VERSION        },
        {  NULL,            0,                 NULL,      0                  },
    };

    bool bold = false;

    const struct color *colors[2] = {
        NULL, /* foreground */
        NULL, /* background */
    };

    const char *file = NULL;

    program_name = argv[0];
    atexit (cleanup);

    setvbuf (stdout, NULL, _IOLBF, 0);

#if DEBUG
    log = open_file (DEBUG_FILE, "w");
#endif

    while ((opt = getopt_long (argc, argv, "hv", long_opts, NULL)) != -1)
      {
        PARSE_OPT:
        switch (opt)
          {
            case 0: /* long opts */
              switch (opt_type)
                {
                  case OPT_CLEAN:
                    clean = true;
                    break;
                  case OPT_CLEAN_ALL:
                    clean_all = true;
                    break;
                  case OPT_EXCLUDE_RANDOM: {
                    bool valid = false;
                    unsigned int i;
                    exclude = xstrdup (optarg);
                    STACK_VAR (exclude);
                    for (i = 1; i < tables[FOREGROUND].count - 1; i++) /* skip color none and default */
                      {
                        const struct color *entry = &tables[FOREGROUND].entries[i];
                        if (streq (exclude, entry->name))
                          {
                            valid = true;
                            break;
                          }
                      }
                    if (!valid)
                      vfprintf_fail (formats[FMT_GENERIC], "--exclude-random switch must be provided a plain color");
                    break;
                  }
                  case OPT_HELP:
                    print_help ();
                    exit (EXIT_SUCCESS);
                  case OPT_VERSION:
                    print_version ();
                    exit (EXIT_SUCCESS);
                  default: /* never reached */
                    ABORT_TRACE ();
                }
              break;
            case 'h':
              SET_OPT_TYPE (OPT_HELP);
            case 'v':
              SET_OPT_TYPE (OPT_VERSION);
            case '?':
              print_hint ();
              exit (EXIT_FAILURE);
            default: /* never reached */
              ABORT_TRACE ();
          }
      }

    arg_cnt = argc - optind;

    if (clean || clean_all)
      {
        if (clean && clean_all)
          vfprintf_fail (formats[FMT_GENERIC], "--clean and --clean-all switch are mutually exclusive");
        if (arg_cnt > 1)
          {
            const char *format = "%s %s";
            const char *message = "switch cannot be used with more than one file";
            if (clean)
              vfprintf_fail (format, "--clean", message);
            else if (clean_all)
              vfprintf_fail (format, "--clean-all", message);
          }
      }
    else
      {
        if (arg_cnt == 0 || arg_cnt > 2)
          {
            vfprintf_diag ("%u arguments provided, expected 1-2 arguments or clean option", arg_cnt);
            print_hint ();
            exit (EXIT_FAILURE);
          }
      }

    if (clean || clean_all)
      process_file_arg (argv[optind], &file, &stream);
    else
      process_args (arg_cnt, &argv[optind], &bold, colors, &file, &stream);
    read_print_stream (bold, colors, file, stream);

    RELEASE_VAR (exclude);

    exit (EXIT_SUCCESS);
}

static void
print_hint (void)
{
    fprintf (stderr, "Type `%s --help' for help screen.\n", program_name);
}

static void
print_help (void)
{
    unsigned int i;

    printf ("Usage: %s (foreground) OR (foreground)%c(background) OR --clean[-all] [-|file]\n\n", program_name, COLOR_SEP_CHAR);
    printf ("\tColors (foreground) (background)\n");
    for (i = 0; i < tables[FOREGROUND].count; i++)
      {
        const struct color *entry = &tables[FOREGROUND].entries[i];
        const char *name = entry->name;
        const char *code = entry->code;
        if (code)
          printf ("\t\t{\033[%s#\033[0m} [%c%c]%s%*s%s\n",
                   code, toupper (*name), *name, name + 1, 10 - (int)strlen (name), " ", name);
        else
          printf ("\t\t{-} %s%*s%s\n", name, 13 - (int)strlen (name), " ", name);
      }
    printf ("\t\t{*} [Rr]%s%*s%s [--exclude-random=<foreground color>]\n", "andom", 10 - (int)strlen ("random"), " ", "random");

    printf ("\n\tFirst character of color name in upper case denotes increased intensity,\n");
    printf ("\twhereas for lower case colors will be of normal intensity.\n");

    printf ("\n\tOptions\n");
    printf ("\t\t    --clean\n");
    printf ("\t\t    --clean-all\n");
    printf ("\t\t    --exclude-random\n");
    printf ("\t\t-h, --help\n");
    printf ("\t\t-v, --version\n\n");
}

static void
print_version (void)
{
#ifdef HAVE_VERSION
# include "version.h"
#else
    const char *version = NULL;
#endif
    const char *version_prefix, *version_string;
    const char *c_flags;
    struct bytes_size bytes_size;
    bool debug;
#ifdef CFLAGS
    c_flags = to_str (CFLAGS);
#else
    c_flags = "unknown";
#endif
#if DEBUG
    debug = true;
#else
    debug = false;
#endif
    version_prefix = version ? "" : "v";
    version_string = version ? version : VERSION;
    printf ("colorize %s%s (compiled at %s, %s)\n", version_prefix, version_string, __DATE__, __TIME__);

    printf ("Compiler flags: %s\n", c_flags);
    if (get_bytes_size (BUF_SIZE, &bytes_size))
      {
        if (BUF_SIZE % 1024 == 0)
          printf ("Buffer size: %u%c\n", bytes_size.size, bytes_size.unit);
        else
          printf ("Buffer size: %u%c, %u byte%s\n", bytes_size.size, bytes_size.unit,
                   BUF_SIZE % 1024, BUF_SIZE % 1024 > 1 ? "s" : "");
      }
    else
      printf ("Buffer size: %lu byte%s\n", (unsigned long)BUF_SIZE, BUF_SIZE > 1 ? "s" : "");
    printf ("Debugging: %s\n", debug ? "yes" : "no");
}

static void
cleanup (void)
{
    free_color_names (color_names);

    if (stream && fileno (stream) != STDIN_FILENO)
      fclose (stream);
#if DEBUG
    if (log)
      fclose (log);
#endif

    if (vars_list)
      {
        unsigned int i;
        for (i = 0; i < stacked_vars; i++)
          if (vars_list[i])
            free_null (vars_list[i]);

        free_null (vars_list);
      }
}

static void
free_color_names (struct color_name **color_names)
{
    unsigned int i;
    for (i = 0; color_names[i]; i++)
      {
        free_null (color_names[i]->name);
        free_null (color_names[i]->orig);
        free_null (color_names[i]);
      }
}

static void
process_args (unsigned int arg_cnt, char **arg_strings, bool *bold, const struct color **colors, const char **file, FILE **stream)
{
    int ret;
    unsigned int index;
    char *color, *p, *str;
    struct stat sb;

    const char *color_string = arg_cnt >= 1 ? arg_strings[0] : NULL;
    const char *file_string  = arg_cnt == 2 ? arg_strings[1] : NULL;

    assert (color_string);

    if (streq (color_string, "-"))
      {
        if (file_string)
          vfprintf_fail (formats[FMT_GENERIC], "hyphen cannot be used as color string");
        else
          vfprintf_fail (formats[FMT_GENERIC], "hyphen must be preceeded by color string");
      }

    ret = lstat (color_string, &sb);

    /* Ensure that we don't fail if there's a file with one or more
       color names in its path.  */
    if (ret == 0) /* success */
      {
        bool have_file;
        unsigned int c;
        const char *color = color_string;
        const mode_t mode = sb.st_mode;

        for (c = 1; c <= 2 && *color; c++)
          {
            bool matched = false;
            unsigned int i;
            for (i = 0; i < tables[FOREGROUND].count; i++)
              {
                const struct color *entry = &tables[FOREGROUND].entries[i];
                if (has_color_name (color, entry->name))
                  {
                    color += strlen (entry->name);
                    matched = true;
                    break;
                  }
              }
            if (!matched && has_color_name (color, "random"))
              {
                color += strlen ("random");
                matched = true;
              }
            if (matched && *color == COLOR_SEP_CHAR && *(color + 1))
              color++;
            else
              break;
          }

        have_file = (*color != '\0');

        if (have_file)
          {
            const char *file_exists = color_string;
            if (file_string)
              vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_exists, "cannot be used as color string");
            else
              {
                if (VALID_FILE_TYPE (mode))
                  vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_exists, "must be preceeded by color string");
                else
                  vfprintf_fail (formats[FMT_QUOTE], get_file_type (mode), file_exists, "is not a valid file type");
              }
          }
      }

    if ((p = strchr (color_string, COLOR_SEP_CHAR)))
      {
        if (p == color_string)
          vfprintf_fail (formats[FMT_STRING], "foreground color missing in string", color_string);
        else if (p == color_string + strlen (color_string) - 1)
          vfprintf_fail (formats[FMT_STRING], "background color missing in string", color_string);
        else if (strchr (++p, COLOR_SEP_CHAR))
          vfprintf_fail (formats[FMT_STRING], "one color pair allowed only for string", color_string);
      }

    str = xstrdup (color_string);
    STACK_VAR (str);

    for (index = 0, color = str; *color; index++, color = p)
      {
        char *ch, *sep;

        p = NULL;
        if ((sep = strchr (color, COLOR_SEP_CHAR)))
          {
            *sep = '\0';
            p = sep + 1;
          }
        else
          p = color + strlen (color);
        assert (p);

        for (ch = color; *ch; ch++)
          if (!isalpha (*ch))
            vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be made of non-alphabetic characters");

        for (ch = color + 1; *ch; ch++)
          if (!islower (*ch))
            vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be in mixed lower/upper case");

        if (streq (color, "None"))
          vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color, "cannot be bold");

        if (isupper (*color))
          {
            switch (index)
              {
                case FOREGROUND:
                  *bold = true;
                  break;
                case BACKGROUND:
                  vfprintf_fail (formats[FMT_COLOR], tables[BACKGROUND].desc, color, "cannot be bold");
                  break;
                default: /* never reached */
                  ABORT_TRACE ();
              }
          }

        color_names[index] = xcalloc (1, sizeof (struct color_name));

        color_names[index]->orig = xstrdup (color);

        for (ch = color; *ch; ch++)
          *ch = tolower (*ch);

        color_names[index]->name = xstrdup (color);
      }

    RELEASE_VAR (str);

    assert (color_names[FOREGROUND]);

    if (color_names[BACKGROUND])
      {
        unsigned int i;
        unsigned int color_sets[2][2] = { { FOREGROUND, BACKGROUND }, { BACKGROUND, FOREGROUND } };
        for (i = 0; i < 2; i++)
          {
            unsigned int color1 = color_sets[i][0];
            unsigned int color2 = color_sets[i][1];
            if (CHECK_COLORS_RANDOM (color1, color2))
              vfprintf_fail (formats[FMT_RANDOM], tables[color1].desc, color_names[color1]->orig, "cannot be combined with", color_names[color2]->orig);
          }
      }

    find_color_entries (color_names, colors);
    free_color_names (color_names);

    if (!colors[FOREGROUND]->code && colors[BACKGROUND] && colors[BACKGROUND]->code)
      {
        struct color_name color_name;
        color_name.name = color_name.orig = "default";

        find_color_entry (&color_name, FOREGROUND, colors);
      }

    process_file_arg (file_string, file, stream);
}

static void
process_file_arg (const char *file_string, const char **file, FILE **stream)
{
    if (file_string)
      {
        if (streq (file_string, "-"))
          *stream = stdin;
        else
          {
            FILE *s;
            const char *file = file_string;
            struct stat sb;
            int ret;

            errno = 0;
            ret = lstat (file, &sb);

            if (ret == -1)
              vfprintf_fail (formats[FMT_FILE], file, strerror (errno));

            if (!VALID_FILE_TYPE (sb.st_mode))
              vfprintf_fail (formats[FMT_TYPE], file, "unrecognized type", get_file_type (sb.st_mode));

            errno = 0;

            s = fopen (file, "r");
            if (!s)
              vfprintf_fail (formats[FMT_FILE], file, strerror (errno));
            *stream = s;
          }
        *file = file_string;
      }
    else
      {
        *stream = stdin;
        *file = "stdin";
      }

    assert (*stream);
    assert (*file);
}

#define MERGE_PRINT_LINE(part_line, line, flags, check_eof) do { \
    char *current_line, *merged_line = NULL;                     \
    if (part_line)                                               \
      {                                                          \
        merged_line = str_concat (part_line, line);              \
        free_null (part_line);                                   \
      }                                                          \
    current_line = merged_line ? merged_line : (char *)line;     \
    if (!check_eof || *current_line != '\0')                     \
      print_line (bold, colors, current_line, flags);            \
    free (merged_line);                                          \
} while (false)

static void
read_print_stream (bool bold, const struct color **colors, const char *file, FILE *stream)
{
    char buf[BUF_SIZE + 1], *part_line = NULL;
    unsigned int flags = 0;

    while (!feof (stream))
      {
        size_t bytes_read;
        char *eol;
        const char *line;
        memset (buf, '\0', BUF_SIZE + 1);
        bytes_read = fread (buf, 1, BUF_SIZE, stream);
        if (bytes_read != BUF_SIZE && ferror (stream))
          vfprintf_fail (formats[FMT_ERROR], BUF_SIZE, "read");
        line = buf;
        while ((eol = strpbrk (line, "\n\r")))
          {
            char *p;
            flags &= ~(CR|LF);
            if (*eol == '\r')
              {
                flags |= CR;
                if (*(eol + 1) == '\n')
                  flags |= LF;
              }
            else if (*eol == '\n')
              flags |= LF;
            else
              vfprintf_fail (formats[FMT_FILE], file, "unrecognized line ending");
            p = eol + SKIP_LINE_ENDINGS (flags);
            *eol = '\0';
            MERGE_PRINT_LINE (part_line, line, flags, false);
            line = p;
          }
        if (feof (stream)) {
          MERGE_PRINT_LINE (part_line, line, 0, true);
        }
        else if (*line != '\0')
          {
            if (!clean && !clean_all) /* efficiency */
              print_line (bold, colors, line, 0);
            else if (!part_line)
              part_line = xstrdup (line);
            else
              {
                char *merged_line = str_concat (part_line, line);
                free (part_line);
                part_line = merged_line;
              }
          }
      }
}

static void
find_color_entries (struct color_name **color_names, const struct color **colors)
{
    struct timeval tv;
    unsigned int index;

    /* randomness */
    gettimeofday (&tv, NULL);
    srand (tv.tv_usec * tv.tv_sec);

    for (index = 0; color_names[index]; index++)
      {
        const char *color_name = color_names[index]->name;

        const unsigned int count                = tables[index].count;
        const struct color *const color_entries = tables[index].entries;

        if (streq (color_name, "random"))
          {
            bool excludable;
            unsigned int i;
            do {
              excludable = false;
              i = rand() % (count - 2) + 1; /* omit color none and default */
              switch (index)
                {
                  case FOREGROUND:
                    /* --exclude-random */
                    if (exclude && streq (exclude, color_entries[i].name))
                      excludable = true;
                    else if (color_names[BACKGROUND] && streq (color_names[BACKGROUND]->name, color_entries[i].name))
                      excludable = true;
                    break;
                  case BACKGROUND:
                    if (streq (colors[FOREGROUND]->name, color_entries[i].name))
                      excludable = true;
                    break;
                  default: /* never reached */
                    ABORT_TRACE ();
                 }
            } while (excludable);
            colors[index] = (struct color *)&color_entries[i];
          }
        else
          find_color_entry (color_names[index], index, colors);
      }
}

static void
find_color_entry (const struct color_name *color_name, unsigned int index, const struct color **colors)
{
    bool found = false;
    unsigned int i;

    const unsigned int count                = tables[index].count;
    const struct color *const color_entries = tables[index].entries;

    for (i = 0; i < count; i++)
      if (streq (color_name->name, color_entries[i].name))
        {
          colors[index] = (struct color *)&color_entries[i];
          found = true;
          break;
        }
    if (!found)
      vfprintf_fail (formats[FMT_COLOR], tables[index].desc, color_name->orig, "not recognized");
}

static void
print_line (bool bold, const struct color **colors, const char *const line, unsigned int flags)
{
    /* --clean[-all] */
    if (clean || clean_all)
      print_clean (line);
    else
      {
        /* Foreground color code is guaranteed to be set when background color code is present.  */
        if (colors[BACKGROUND] && colors[BACKGROUND]->code)
          printf ("\033[%s", colors[BACKGROUND]->code);
        if (colors[FOREGROUND]->code)
          printf ("\033[%s%s%s\033[0m", bold ? "1;" : "", colors[FOREGROUND]->code, line);
        else
          printf (formats[FMT_GENERIC], line);
      }
    if (flags & CR)
      putchar ('\r');
    if (flags & LF)
      putchar ('\n');
}

static void
print_clean (const char *line)
{
    const char *p;
    char ***offsets = NULL;
    unsigned int count = 0, i = 0;

    for (p = line; *p;)
      {
        /* ESC[ */
        if (*p == 27 && *(p + 1) == '[')
          {
            const char *begin = p;
            p += 2;
            if (clean_all)
              {
                while (isdigit (*p) || *p == ';')
                  p++;
              }
            else if (clean)
              {
                bool check_values;
                unsigned int iter = 0;
                const char *digit;
                do {
                  check_values = false;
                  iter++;
                  if (!isdigit (*p))
                    goto DISCARD;
                  digit = p;
                  while (isdigit (*p))
                    p++;
                  if (p - digit > 2)
                    goto DISCARD;
                  else /* check range */
                    {
                      char val[3];
                      int value;
                      unsigned int i;
                      const unsigned int digits = p - digit;
                      for (i = 0; i < digits; i++)
                        val[i] = *digit++;
                      val[i] = '\0';
                      value = atoi (val);
                      if (value == 0) /* reset */
                        {
                          if (iter > 1)
                            goto DISCARD;
                          goto END;
                        }
                      else if (value == 1) /* bold */
                        {
                          bool discard = false;
                          if (iter > 1)
                            discard = true;
                          else if (*p != ';')
                            discard = true;
                          if (discard)
                            goto DISCARD;
                          p++;
                          check_values = true;
                        }
                      else if ((value >= 30 && value <= 37) || value == 39) /* foreground colors */
                        goto END;
                      else if ((value >= 40 && value <= 47) || value == 49) /* background colors */
                        {
                          if (iter > 1)
                            goto DISCARD;
                          goto END;
                        }
                      else
                        goto DISCARD;
                    }
                } while (iter == 1 && check_values);
              }
            END: if (*p == 'm')
              {
                const char *end = p++;
                if (!offsets)
                  offsets = xmalloc (++count * sizeof (char **));
                else
                  offsets = xrealloc (offsets, ++count * sizeof (char **));
                offsets[i] = xmalloc (2 * sizeof (char *));
                offsets[i][0] = (char *)begin; /* ESC */
                offsets[i][1] = (char *)end;   /* m */
                i++;
                continue;
              }
            DISCARD:
              continue;
          }
        p++;
      }

    if (offsets)
      print_free_offsets (line, offsets, count);
    else
      printf (formats[FMT_GENERIC], line);
}

#define SET_CHAR(offset, new, old) \
    *old = *offset;                \
    *offset = new;                 \

#define RESTORE_CHAR(offset, old)  \
    *offset = old;                 \

static void
print_free_offsets (const char *line, char ***offsets, unsigned int count)
{
    char ch;
    unsigned int i;

    SET_CHAR (offsets[0][0], '\0', &ch);
    printf (formats[FMT_GENERIC], line);
    RESTORE_CHAR (offsets[0][0], ch);

    for (i = 0; i < count; i++)
      {
        char ch;
        bool next_offset = false;
        if (i + 1 < count)
          {
            SET_CHAR (offsets[i + 1][0], '\0', &ch);
            next_offset = true;
          }
        printf (formats[FMT_GENERIC], offsets[i][1] + 1);
        if (next_offset)
          RESTORE_CHAR (offsets[i + 1][0], ch);
      }
    for (i = 0; i < count; i++)
      free_null (offsets[i]);
    free_null (offsets);
}

#if !DEBUG
static void *
malloc_wrap (size_t size)
{
    void *p = malloc (size);
    if (!p)
      MEM_ALLOC_FAIL ();
    return p;
}

static void *
calloc_wrap (size_t nmemb, size_t size)
{
    void *p = calloc (nmemb, size);
    if (!p)
      MEM_ALLOC_FAIL ();
    return p;
}

static void *
realloc_wrap (void *ptr, size_t size)
{
    void *p = realloc (ptr, size);
    if (!p)
      MEM_ALLOC_FAIL ();
    return p;
}
#else
static void *
malloc_wrap_debug (size_t size, const char *file, unsigned int line)
{
    void *p = malloc (size);
    if (!p)
      MEM_ALLOC_FAIL_DEBUG (file, line);
    fprintf (log, "%s: malloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
    return p;
}

static void *
calloc_wrap_debug (size_t nmemb, size_t size, const char *file, unsigned int line)
{
    void *p = calloc (nmemb, size);
    if (!p)
      MEM_ALLOC_FAIL_DEBUG (file, line);
    fprintf (log, "%s: calloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)(nmemb * size), file, line);
    return p;
}

static void *
realloc_wrap_debug (void *ptr, size_t size, const char *file, unsigned int line)
{
    void *p = realloc (ptr, size);
    if (!p)
      MEM_ALLOC_FAIL_DEBUG (file, line);
    fprintf (log, "%s: realloc'ed %lu bytes [source file %s, line %u]\n", program_name, (unsigned long)size, file, line);
    return p;
}
#endif /* !DEBUG */

static void
free_wrap (void **ptr)
{
    free (*ptr);
    *ptr = NULL;
}

#if !DEBUG
# define do_malloc(len, file, line) malloc_wrap(len)
#else
# define do_malloc(len, file, line) malloc_wrap_debug(len, file, line)
#endif

static char *
strdup_wrap (const char *str, const char *file, unsigned int line)
{
    const size_t len = strlen (str) + 1;
    char *p = do_malloc (len, file, line);
    strncpy (p, str, len);
    return p;
}

static char *
str_concat_wrap (const char *str1, const char *str2, const char *file, unsigned int line)
{
    const size_t len = strlen (str1) + strlen (str2) + 1;
    char *p, *str;

    p = str = do_malloc (len, file, line);
    strncpy (p, str1, strlen (str1));
    p += strlen (str1);
    strncpy (p, str2, strlen (str2));
    p += strlen (str2);
    *p = '\0';

    return str;
}

static bool
get_bytes_size (unsigned long bytes, struct bytes_size *bytes_size)
{
    const char *unit, units[] = { '0', 'K', 'M', 'G', '\0' };
    unsigned long size = bytes;
    if (bytes < 1024)
      return false;
    unit = units;
    while (size >= 1024 && *(unit + 1))
      {
        size /= 1024;
        unit++;
      }
    bytes_size->size = (unsigned int)size;
    bytes_size->unit = *unit;
    return true;
}

static char *
get_file_type (mode_t mode)
{
    if (S_ISREG (mode))
      return "file";
    else if (S_ISDIR (mode))
      return "directory";
    else if (S_ISCHR (mode))
      return "character device";
    else if (S_ISBLK (mode))
      return "block device";
    else if (S_ISFIFO (mode))
      return "named pipe";
    else if (S_ISLNK (mode))
      return "symbolic link";
    else if (S_ISSOCK (mode))
      return "socket";
    else
      return "file";
}

static bool
has_color_name (const char *str, const char *name)
{
    char *p;

    assert (strlen (str));
    assert (strlen (name));

    if (!(*str == *name || *str == toupper (*name)))
      return false;
    else if (*(name + 1) != '\0'
     && !((p = strstr (str + 1, name + 1)) && p == str + 1))
      return false;

    return true;
}

static FILE *
open_file (const char *file, const char *mode)
{
    FILE *stream;

    errno = 0;
    stream = fopen (file, mode);
    if (!stream)
      vfprintf_fail (formats[FMT_FILE], file, strerror (errno));

    return stream;
}

#define DO_VFPRINTF(fmt)                    \
    va_list ap;                             \
    fprintf (stderr, "%s: ", program_name); \
    va_start (ap, fmt);                     \
    vfprintf (stderr, fmt, ap);             \
    va_end (ap);                            \
    fprintf (stderr, "\n");                 \

static void
vfprintf_diag (const char *fmt, ...)
{
    DO_VFPRINTF (fmt);
}

static void
vfprintf_fail (const char *fmt, ...)
{
    DO_VFPRINTF (fmt);
    exit (EXIT_FAILURE);
}

static void
stack_var (void ***list, unsigned int *stacked, unsigned int index, void *ptr)
{
    /* nothing to stack */
    if (ptr == NULL)
      return;
    if (!*list)
      *list = xmalloc (sizeof (void *));
    else
      {
        unsigned int i;
        for (i = 0; i < *stacked; i++)
          if (!(*list)[i])
            {
              (*list)[i] = ptr;
              return; /* reused */
            }
        *list = xrealloc (*list, (*stacked + 1) * sizeof (void *));
      }
    (*list)[index] = ptr;
    (*stacked)++;
}

static void
release_var (void **list, unsigned int stacked, void **ptr)
{
    unsigned int i;
    /* nothing to release */
    if (*ptr == NULL)
      return;
    for (i = 0; i < stacked; i++)
      if (list[i] == *ptr)
        {
          free (*ptr);
          *ptr = NULL;
          list[i] = NULL;
          return;
        }
}