/* regtool.cc

   Copyright 2000 Red Hat Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <getopt.h>
#include <windows.h>

enum
{
  KT_AUTO, KT_INT, KT_STRING, KT_EXPAND, KT_MULTI
} key_type = KT_AUTO;

#define LIST_KEYS	0x01
#define LIST_VALS	0x02
#define LIST_ALL	(LIST_KEYS | LIST_VALS)

int listwhat = 0;
int postfix = 0;
int verbose = 0;
int quiet = 0;
char **argv;

HKEY key;
char *value;

const char *usage_msg[] = {
  "Regtool Copyright (c) 2000 Red Hat Inc",
  " regtool -h  - print this message",
  " regtool [-v|-p|-k|-l] list [key]  - list subkeys and values",
  "     -p=postfix, like ls -p, appends \\ postfix to key names",
  "     -k=keys, lists only keys",
  "     -l=values, lists only values",
  " regtool [-v] add [key\\subkey]  - add new subkey",
  " regtool [-v] remove [key]  - remove key",
  " regtool [-v|-q] check [key]  - exit 0 if key exists, 1 if not",
  " regtool [-i|-s|-e|-m] set [key\\value] [data ...]  - set value",
  "     -i=integer -s=string -e=expand-string -m=multi-string",
  " regtool [-v] unset [key\\value]  - removes value from key",
  " regtool [-q] get [key\\value]  - prints value to stdout",
  "     -q=quiet, no error msg, just return nonzero exit if key/value missing",
  " keys are like \\prefix\\key\\key\\key\\value, where prefix is any of:",
  "   root     HKCR  HKEY_CLASSES_ROOT",
  "   config   HKCC  HKEY_CURRENT_CONFIG",
  "   user     HKCU  HKEY_CURRENT_USER",
  "   machine  HKLM  HKEY_LOCAL_MACHINE",
  "   users    HKU   HKEY_USERS",
  " example: \\user\\software\\Microsoft\\Clock\\iFormat",
  0
};

void
usage (void)
{
  int i;
  for (i = 0; usage_msg[i]; i++)
    fprintf (stderr, "%s\n", usage_msg[i]);
  exit (1);
}

void
Fail (DWORD rv)
{
  char *buf;
  if (!quiet)
    {
      FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER
		     | FORMAT_MESSAGE_FROM_SYSTEM,
		     0, rv, 0, (CHAR *) & buf, 0, 0);
      fprintf (stderr, "Error: %s\n", buf);
      LocalFree (buf);
    }
  exit (1);
}

struct
{
  const char *string;
  HKEY key;
} wkprefixes[] =
{
  {"root", HKEY_CLASSES_ROOT},
  {"HKCR", HKEY_CLASSES_ROOT},
  {"HKEY_CLASSES_ROOT", HKEY_CLASSES_ROOT},
  {"config", HKEY_CURRENT_CONFIG},
  {"HKCC", HKEY_CURRENT_CONFIG},
  {"HKEY_CURRENT_CONFIG", HKEY_CURRENT_CONFIG},
  {"user", HKEY_CURRENT_USER},
  {"HKCU", HKEY_CURRENT_USER},
  {"HKEY_CURRENT_USER", HKEY_CURRENT_USER},
  {"machine", HKEY_LOCAL_MACHINE},
  {"HKLM", HKEY_LOCAL_MACHINE},
  {"HKEY_LOCAL_MACHINE", HKEY_LOCAL_MACHINE},
  {"users", HKEY_USERS},
  {"HKU", HKEY_USERS},
  {"HKEY_USERS", HKEY_USERS},
  {0, 0}
};

void
translate (char *key)
{
#define isodigit(c) (strchr("01234567", c))
#define tooct(c)    ((c)-'0')
#define tohex(c)    (strchr(_hs,tolower(c))-_hs)
  static char _hs[] = "0123456789abcdef";

  char *d = key;
  char *s = key;
  char c;

  while (*s)
    {
      if (*s == '\\')
	switch (*++s)
	  {
	  case 'a':
	    *d++ = '\007';
	    break;
	  case 'b':
	    *d++ = '\b';
	    break;
	  case 'e':
	    *d++ = '\033';
	    break;
	  case 'f':
	    *d++ = '\f';
	    break;
	  case 'n':
	    *d++ = '\n';
	    break;
	  case 'r':
	    *d++ = '\r';
	    break;
	  case 't':
	    *d++ = '\t';
	    break;
	  case 'v':
	    *d++ = '\v';
	    break;
	  case '0':
	  case '1':
	  case '2':
	  case '3':
	  case '4':
	  case '5':
	  case '6':
	  case '7':
	    c = tooct (*s);
	    if (isodigit (s[1]))
	      {
		c = (c << 3) | tooct (*++s);
		if (isodigit (s[1]))
		  c = (c << 3) | tooct (*++s);
	      }
	    *d++ = c;
	    break;
	  case 'x':
	    if (!isxdigit (s[1]))
	      c = '0';
	    else
	      {
		c = tohex (*++s);
		if (isxdigit (s[1]))
		  c = (c << 4) | tohex (*++s);
	      }
	    *d++ = c;
	    break;
	  default:		/* before non-special char: just add the char */
	    *d++ = *s;
	    break;
	  }
      else if (*s == '/')
	*d++ = '\\';
      else
	*d++ = *s;
      ++s;
    }
  *d = '\0';
}

void
find_key (int howmanyparts, REGSAM access)
{
  char *n = argv[0], *e, c;
  int i;
  if (*n == '/')
    translate (n);
  while (*n == '\\')
    n++;
  for (e = n; *e && *e != '\\'; e++);
  c = *e;
  *e = 0;
  for (i = 0; wkprefixes[i].string; i++)
    if (strcmp (wkprefixes[i].string, n) == 0)
      break;
  if (!wkprefixes[i].string)
    {
      fprintf (stderr, "Unknown key prefix.  Valid prefixes are:\n");
      for (i = 0; wkprefixes[i].string; i++)
	fprintf (stderr, "\t%s\n", wkprefixes[i].string);
      exit (1);
    }

  n = e;
  *e = c;
  while (*n && *n == '\\')
    n++;
  e = n + strlen (n);
  if (howmanyparts > 1)
    {
      while (n < e && *e != '\\')
	e--;
      if (*e != '\\')
	{
	  key = wkprefixes[i].key;
	  value = n;
	  return;
	}
      else
        {
	  *e = 0;
	  value = e + 1;
	}
    }
  if (n[0] == 0)
    {
      key = wkprefixes[i].key;
      return;
    }
  int rv = RegOpenKeyEx (wkprefixes[i].key, n, 0, access, &key);
  if (rv != ERROR_SUCCESS)
    Fail (rv);
  //printf("key `%s' value `%s'\n", n, value);
}


int
cmd_list ()
{
  DWORD num_subkeys, maxsubkeylen, num_values, maxvalnamelen, maxvaluelen;
  DWORD maxclasslen;
  char *subkey_name, *value_name, *class_name;
  unsigned char *value_data, *vd;
  DWORD i, j, m, n, t;
  int v;

  find_key (1, KEY_READ);
  RegQueryInfoKey (key, 0, 0, 0, &num_subkeys, &maxsubkeylen, &maxclasslen,
		   &num_values, &maxvalnamelen, &maxvaluelen, 0, 0);

  subkey_name = (char *) malloc (maxsubkeylen + 1);
  class_name = (char *) malloc (maxclasslen + 1);
  value_name = (char *) malloc (maxvalnamelen + 1);
  value_data = (unsigned char *) malloc (maxvaluelen + 1);

  if (!listwhat)
    listwhat = LIST_ALL;

  if (listwhat & LIST_KEYS)
    for (i = 0; i < num_subkeys; i++)
      {
	m = maxsubkeylen + 1;
	n = maxclasslen + 1;
	RegEnumKeyEx (key, i, subkey_name, &m, 0, class_name, &n, 0);
	printf ("%s%s", subkey_name, (postfix || verbose) ? "\\" : "");

	if (verbose)
	  printf (" (%s)", class_name);

	puts ("");
      }

  if (listwhat & LIST_VALS)
    for (i = 0; i < num_values; i++)
      {
	m = maxvalnamelen + 1;
	n = maxvaluelen + 1;
	RegEnumValue (key, i, value_name, &m, 0, &t, (BYTE *) value_data, &n);
	if (!verbose)
	  printf ("%s\n", value_name);
	else
	  {
	    printf ("%s = ", value_name);
	    switch (t)
	      {
	      case REG_BINARY:
		for (j = 0; j < 8 && j < n; j++)
		  printf ("%02x ", value_data[j]);
		printf ("\n");
		break;
	      case REG_DWORD:
		printf ("0x%08lx (%lu)\n", *(DWORD *) value_data,
			*(DWORD *) value_data);
		break;
	      case REG_DWORD_BIG_ENDIAN:
		v = ((value_data[0] << 24)
		     | (value_data[1] << 16)
		     | (value_data[2] << 8) | (value_data[3]));
		printf ("0x%08x (%d)\n", v, v);
		break;
	      case REG_EXPAND_SZ:
	      case REG_SZ:
		printf ("\"%s\"\n", value_data);
		break;
	      case REG_MULTI_SZ:
		vd = value_data;
		while (vd && *vd)
		  {
		    printf ("\"%s\"", vd);
		    vd = vd + strlen ((const char *) vd) + 1;
		    if (*vd)
		      printf (", ");
		  }
		printf ("\n");
		break;
	      default:
		printf ("? (type %d)\n", (int) t);
	      }
	  }
      }
  return 0;
}

int
cmd_add ()
{
  find_key (2, KEY_ALL_ACCESS);
  HKEY newkey;
  DWORD newtype;
  int rv = RegCreateKeyEx (key, value, 0, (char *) "", REG_OPTION_NON_VOLATILE,
			   KEY_ALL_ACCESS, 0, &newkey, &newtype);
  if (rv != ERROR_SUCCESS)
    Fail (rv);

  if (verbose)
    {
      if (newtype == REG_OPENED_EXISTING_KEY)
	printf ("Key %s already exists\n", value);
      else
	printf ("Key %s created\n", value);
    }
  return 0;
}

int
cmd_remove ()
{
  find_key (2, KEY_ALL_ACCESS);
  DWORD rv = RegDeleteKey (key, value);
  if (rv != ERROR_SUCCESS)
    Fail (rv);
  if (verbose)
    printf ("subkey %s deleted\n", value);
  return 0;
}

int
cmd_check ()
{
  find_key (1, KEY_READ);
  if (verbose)
    printf ("key %s exists\n", argv[0]);
  return 0;
}

int
cmd_set ()
{
  int i, n;
  DWORD v, rv;
  char *a = argv[1], *data;
  find_key (2, KEY_ALL_ACCESS);

  if (key_type == KT_AUTO)
    {
      char *e;
      strtoul (a, &e, 0);
      if (a[0] == '%')
	key_type = KT_EXPAND;
      else if (a[0] && !*e)
	key_type = KT_INT;
      else if (argv[2])
	key_type = KT_MULTI;
      else
	key_type = KT_STRING;
    }

  switch (key_type)
    {
    case KT_INT:
      v = strtoul (a, 0, 0);
      rv = RegSetValueEx (key, value, 0, REG_DWORD, (const BYTE *) &v,
			  sizeof (v));
      break;
    case KT_STRING:
      rv = RegSetValueEx (key, value, 0, REG_SZ, (const BYTE *) a, strlen (a));
      break;
    case KT_EXPAND:
      rv = RegSetValueEx (key, value, 0, REG_EXPAND_SZ, (const BYTE *) a,
			  strlen (a));
      break;
    case KT_MULTI:
      for (i = 1, n = 1; argv[i]; i++)
	n += strlen (argv[i]) + 1;
      data = (char *) malloc (n);
      for (i = 1, n = 0; argv[i]; i++)
	{
	  strcpy (data + n, argv[i]);
	  n += strlen (argv[i]) + 1;
	}
      data[n] = 0;
      rv = RegSetValueEx (key, value, 0, REG_MULTI_SZ, (const BYTE *) data,
			  n + 1);
      break;
    case KT_AUTO:
      rv = ERROR_SUCCESS;
      break;
    default:
      rv = ERROR_INVALID_CATEGORY;
      break;
    }

  if (rv != ERROR_SUCCESS)
    Fail (rv);

  return 0;
}

int
cmd_unset ()
{
  find_key (2, KEY_ALL_ACCESS);
  DWORD rv = RegDeleteValue (key, value);
  if (rv != ERROR_SUCCESS)
    Fail (rv);
  if (verbose)
    printf ("value %s deleted\n", value);
  return 0;
}

int
cmd_get ()
{
  find_key (2, KEY_READ);
  DWORD vtype, dsize, rv;
  char *data, *vd;
  rv = RegQueryValueEx (key, value, 0, &vtype, 0, &dsize);
  if (rv != ERROR_SUCCESS)
    Fail (rv);
  dsize++;
  data = (char *) malloc (dsize);
  rv = RegQueryValueEx (key, value, 0, &vtype, (BYTE *) data, &dsize);
  if (rv != ERROR_SUCCESS)
    Fail (rv);
  switch (vtype)
    {
    case REG_BINARY:
      fwrite (data, dsize, 0, stdout);
      break;
    case REG_DWORD:
      printf ("%lu\n", *(DWORD *) data);
      break;
    case REG_SZ:
      printf ("%s\n", data);
      break;
    case REG_EXPAND_SZ:
      if (key_type == KT_EXPAND)	// hack
	{
	  char *buf;
	  DWORD bufsize;
	  bufsize = ExpandEnvironmentStrings (data, 0, 0);
	  buf = (char *) malloc (bufsize + 1);
	  ExpandEnvironmentStrings (data, buf, bufsize + 1);
	  data = buf;
	}
      printf ("%s\n", data);
      break;
    case REG_MULTI_SZ:
      vd = data;
      while (vd && *vd)
	{
	  printf ("%s\n", vd);
	  vd = vd + strlen ((const char *) vd) + 1;
	}
      break;
    }
  return 0;
}

struct
{
  const char *name;
  int (*func) ();
} commands[] =
{
  {"list", cmd_list},
  {"add", cmd_add},
  {"remove", cmd_remove},
  {"check", cmd_check},
  {"set", cmd_set},
  {"unset", cmd_unset},
  {"get", cmd_get},
  {0, 0}
};

int
main (int argc, char **_argv)
{
  while (1)
    {
      int g = getopt (argc, _argv, "hvqisempkl");
      if (g == -1)
	break;
      switch (g)
	{
	case 'v':
	  verbose++;
	  break;
	case 'q':
	  quiet++;
	  break;
	case 'p':
	  postfix++;
	  break;
	case 'k':
	  listwhat |= LIST_KEYS;
	  break;
	case 'l':
	  listwhat |= LIST_VALS;
	  break;

	case 'i':
	  key_type = KT_INT;
	  break;
	case 's':
	  key_type = KT_STRING;
	  break;
	case 'e':
	  key_type = KT_EXPAND;
	  break;
	case 'm':
	  key_type = KT_MULTI;
	  break;

	case '?':
	case 'h':
	  usage ();
	}
    }
  if (_argv[optind] == NULL)
    usage ();

  argv = _argv + optind;
  int i;
  for (i = 0; commands[i].name; i++)
    if (strcmp (commands[i].name, argv[0]) == 0)
      {
	argv++;
	return commands[i].func ();
      }
  usage ();

  return 0;
}