libc/winsup/utils/cygcheck.cc

/* cygcheck.cc

   Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 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. */

#define cygwin_internal cygwin_internal_dontuse
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/time.h>
#include <ctype.h>
#include <io.h>
#include <windows.h>
#include <wininet.h>
#include "path.h"
#include <getopt.h>
#include "cygwin/include/sys/cygwin.h"
#include "cygwin/include/mntent.h"
#undef cygwin_internal

#define alloca __builtin_alloca

int verbose = 0;
int registry = 0;
int sysinfo = 0;
int givehelp = 0;
int keycheck = 0;
int check_setup = 0;
int dump_only = 0;
int find_package = 0;
int list_package = 0;
int grep_packages = 0;

#ifdef __GNUC__
typedef long long longlong;
#else
typedef __int64 longlong;
#endif

void dump_setup (int, char **, bool);
void package_find (int, char **);
void package_list (int, char **);

static const char version[] = "$Revision$";

static const char *known_env_vars[] = {
  "c_include_path",
  "compiler_path",
  "cxx_include_path",
  "cygwin",
  "cygwin32",
  "dejagnu",
  "expect",
  "gcc_default_options",
  "gcc_exec_prefix",
  "home",
  "ld_library_path",
  "library_path",
  "login",
  "lpath",
  "make_mode",
  "makeflags",
  "path",
  "pwd",
  "strace",
  "tcl_library",
  "user",
  0
};

struct
{
  const char *name;
  int missing_is_good;
}
static common_apps[] = {
  {"awk", 0},
  {"bash", 0},
  {"cat", 0},
  {"cp", 0},
  {"cpp", 1},
  {"crontab", 0},
  {"find", 0},
  {"gcc", 0},
  {"gdb", 0},
  {"grep", 0},
  {"kill", 0},
  {"ld", 0},
  {"ls", 0},
  {"make", 0},
  {"mv", 0},
  {"perl", 0},
  {"rm", 0},
  {"sed", 0},
  {"ssh", 0},
  {"sh", 0},
  {"tar", 0},
  {"test", 0},
  {"vi", 0},
  {"vim", 0},
  {0, 0}
};

static int num_paths = 0, max_paths = 0;
static char **paths = 0;

void
eprintf (const char *format, ...)
{
  va_list ap;
  va_start (ap, format);
  vfprintf (stderr, format, ap);
  va_end (ap);
}

/*
 * display_error() is used to report failure modes
 */
static int
display_error (const char *name, bool show_error = true, bool print_failed = true)
{
  if (show_error)
    fprintf (stderr, "cygcheck: %s%s: %lu\n", name,
	print_failed ? " failed" : "", GetLastError ());
  else
    fprintf (stderr, "cygcheck: %s%s\n", name,
	print_failed ? " failed" : "");
  return 1;
}

/* Display a WinInet error message, and close a variable number of handles.
   (Passed a list of handles terminated by NULL.)  */
static int
display_internet_error (const char *message, ...)
{
  DWORD err = GetLastError ();
  TCHAR err_buf[256];
  va_list hptr;
  HINTERNET h;

  /* in the case of a successful connection but 404 response, there is no
     win32 error message, but we still get passed a message to display.  */
  if (err)
    {
      if (FormatMessage (FORMAT_MESSAGE_FROM_HMODULE,
          GetModuleHandle ("wininet.dll"), err, 0, err_buf,
          sizeof (err_buf), NULL) == 0)
        strcpy (err_buf, "(Unknown error)");

      fprintf (stderr, "cygcheck: %s: %s (win32 error %d)\n", message,
               err_buf, err);
    }
  else
    fprintf (stderr, "cygcheck: %s\n", message);

  va_start (hptr, message);
  while ((h = va_arg (hptr, HINTERNET)) != 0)
    InternetCloseHandle (h);
  va_end (hptr);

  return 1;
}

static void
add_path (char *s, int maxlen)
{
  if (num_paths >= max_paths)
    {
      max_paths += 10;
      if (paths)
	paths = (char **) realloc (paths, max_paths * sizeof (char *));
      else
	paths = (char **) malloc (max_paths * sizeof (char *));
    }
  paths[num_paths] = (char *) malloc (maxlen + 1);
  if (paths[num_paths] == NULL)
    {
      display_error ("add_path: malloc()");
      return;
    }
  memcpy (paths[num_paths], s, maxlen);
  paths[num_paths][maxlen] = 0;
  char *e = paths[num_paths] + strlen (paths[num_paths]);
  if (e[-1] == '\\' && e[-2] != ':')
    *--e = 0;
  for (int i = 1; i < num_paths; i++)
    if (strcasecmp (paths[num_paths], paths[i]) == 0)
      {
	free (paths[num_paths]);
	return;
      }
  num_paths++;
}

static void
init_paths ()
{
  char tmp[4000], *sl;
  add_path ((char *) ".", 1);	/* to be replaced later */

  if (GetCurrentDirectory (4000, tmp))
    add_path (tmp, strlen (tmp));
  else
    display_error ("init_paths: GetCurrentDirectory()");

  if (GetSystemDirectory (tmp, 4000))
    add_path (tmp, strlen (tmp));
  else
    display_error ("init_paths: GetSystemDirectory()");
  sl = strrchr (tmp, '\\');
  if (sl)
    {
      strcpy (sl, "\\SYSTEM");
      add_path (tmp, strlen (tmp));
    }
  GetWindowsDirectory (tmp, 4000);
  add_path (tmp, strlen (tmp));

  char *wpath = getenv ("PATH");
  if (wpath)
    {
      char *b, *e;
      b = wpath;
      while (1)
	{
	  for (e = b; *e && *e != ';'; e++);
	  if (strncmp(b, ".", 1) && strncmp(b, ".\\", 2))
	    add_path (b, e - b);
	  if (!*e)
	    break;
	  b = e + 1;
	}
    }
  else
    printf ("WARNING: PATH is not set at all!\n");
}

static char *
find_on_path (char *file, char *default_extension,
	      int showall = 0, int search_sysdirs = 0)
{
  static char rv[4000];
  char tmp[4000], *ptr = rv;

  if (!file)
    {
      display_error ("find_on_path: NULL pointer for file", false, false);
      return 0;
    }

  if (default_extension == NULL)
    {
      display_error ("find_on_path: NULL pointer for default_extension", false, false);
      return 0;
    }

  if (strchr (file, ':') || strchr (file, '\\') || strchr (file, '/'))
    {
      char *fn = cygpath (file, NULL);
      if (access (fn, F_OK) == 0)
	return fn;
      strcpy (rv, fn);
      strcat (rv, default_extension);
      return access (rv, F_OK) == 0 ? rv : fn;
    }

  if (strchr (file, '.'))
    default_extension = (char *) "";

  for (int i = 0; i < num_paths; i++)
    {
      if (!search_sysdirs && (i == 0 || i == 2 || i == 3))
	continue;
      if (i == 0 || !search_sysdirs || strcasecmp (paths[i], paths[0]))
	{
	  sprintf (ptr, "%s\\%s%s", paths[i], file, default_extension);
	  if (GetFileAttributes (ptr) != (DWORD) - 1)
	    {
	      if (showall)
		printf ("Found: %s\n", ptr);
	      if (ptr == tmp && verbose)
		printf ("Warning: %s hides %s\n", rv, ptr);
	      ptr = tmp;
	    }
	}
    }

  if (ptr == tmp)
    return rv;

  return 0;
}

#define DID_NEW		1
#define DID_ACTIVE	2
#define DID_INACTIVE	3

struct Did
{
  Did *next;
  char *file;
  int state;
};
static Did *did = 0;

static Did *
already_did (char *file)
{
  Did *d;
  for (d = did; d; d = d->next)
    if (strcasecmp (d->file, file) == 0)
      return d;
  d = (Did *) malloc (sizeof (Did));
  d->file = strdup (file);
  d->next = did;
  d->state = DID_NEW;
  did = d;
  return d;
}

static int
get_word (HANDLE fh, int offset)
{
  short rv;
  unsigned r;

  if (SetFilePointer (fh, offset, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER
      && GetLastError () != NO_ERROR)
    display_error ("get_word: SetFilePointer()");

  if (!ReadFile (fh, &rv, 2, (DWORD *) &r, 0))
    display_error ("get_word: Readfile()");

  return rv;
}

static int
get_dword (HANDLE fh, int offset)
{
  int rv;
  unsigned r;

  if (SetFilePointer (fh, offset, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER
      && GetLastError () != NO_ERROR)
    display_error ("get_dword: SetFilePointer()");

  if (!ReadFile (fh, &rv, 4, (DWORD *) &r, 0))
    display_error ("get_dword: Readfile()");

  return rv;
}

struct Section
{
  char name[8];
  int virtual_size;
  int virtual_address;
  int size_of_raw_data;
  int pointer_to_raw_data;
};

static int
rva_to_offset (int rva, char *sections, int nsections, int *sz)
{
  int i;

  if (sections == NULL)
    {
      display_error ("rva_to_offset: NULL passed for sections", true, false);
      return 0;
    }

  for (i = 0; i < nsections; i++)
    {
      Section *s = (Section *) (sections + i * 40);
#if 0
      printf ("%08x < %08x < %08x ? %08x\n",
	      s->virtual_address, rva,
	      s->virtual_address + s->virtual_size, s->pointer_to_raw_data);
#endif
      if (rva >= s->virtual_address
	  && rva < s->virtual_address + s->virtual_size)
	{
	  if (sz)
	    *sz = s->virtual_address + s->virtual_size - rva;
	  return rva - s->virtual_address + s->pointer_to_raw_data;
	}
    }
  return 0;			/* punt */
}

struct ExpDirectory
{
  int flags;
  int timestamp;
  short major_ver;
  short minor_ver;
  int name_rva;
};

struct ImpDirectory
{
  unsigned characteristics;
  unsigned timestamp;
  unsigned forwarder_chain;
  unsigned name_rva;
  unsigned iat_rva;
};


static bool track_down (char *file, char *suffix, int lvl);

#define CYGPREFIX (sizeof ("%%% Cygwin ") - 1)
static void
cygwin_info (HANDLE h)
{
  char *buf, *bufend, *buf_start = NULL;
  const char *hello = "    Cygwin DLL version info:\n";
  DWORD size = GetFileSize (h, NULL);
  DWORD n;

  if (size == 0xffffffff)
    return;

  buf_start = buf = (char *) calloc (1, size + 1);
  if (buf == NULL)
    {
      display_error ("cygwin_info: calloc()");
      return;
    }

  (void) SetFilePointer (h, 0, NULL, FILE_BEGIN);
  if (!ReadFile (h, buf, size, &n, NULL))
    {
      free (buf_start);
      return;
    }

  static char dummy[] = "\0\0\0\0\0\0\0";
  char *dll_major = dummy;
  bufend = buf + size;
  while (buf < bufend)
    if ((buf = (char *) memchr (buf, '%', bufend - buf)) == NULL)
      break;
    else if (strncmp ("%%% Cygwin ", buf, CYGPREFIX) != 0)
      buf++;
    else
      {
	char *p = strchr (buf += CYGPREFIX, '\n');
	if (!p)
	  break;
	if (strncasecmp (buf, "dll major:", 10) == 0)
	  {
	    dll_major = buf + 11;
	    continue;
	  }
	char *s, pbuf[80];
	int len;
	len = 1 + p - buf;
	if (strncasecmp (buf, "dll minor:", 10) != 0)
	  s = buf;
	else
	  {
	    char c = dll_major[1];
	    dll_major[1] = '\0';
	    int maj = atoi (dll_major);
	    dll_major[1] = c;
	    int min = atoi (dll_major + 1);
	    sprintf (pbuf, "DLL version: %d.%d.%.*s", maj, min, len - 11,
		     buf + 11);
	    len = strlen (s = pbuf);
	  }
	if (strncmp (s, "dll", 3) == 0)
	  memcpy (s, "DLL", 3);
	else if (strncmp (s, "api", 3) == 0)
	  memcpy (s, "API", 3);
	else if (islower (*s))
	  *s = toupper (*s);
	fprintf (stdout, "%s        %.*s", hello, len, s);
	hello = "";
      }

  if (!*hello)
    puts ("");

  free (buf_start);
  return;
}

static void
dll_info (const char *path, HANDLE fh, int lvl, int recurse)
{
  DWORD junk;
  int i;
  int pe_header_offset = get_dword (fh, 0x3c);
  int opthdr_ofs = pe_header_offset + 4 + 20;
  unsigned short v[6];

  if (path == NULL)
    {
      display_error ("dll_info: NULL passed for path", true, false);
      return;
    }

  if (SetFilePointer (fh, opthdr_ofs + 40, 0, FILE_BEGIN) ==
      INVALID_SET_FILE_POINTER && GetLastError () != NO_ERROR)
    display_error ("dll_info: SetFilePointer()");

  if (!ReadFile (fh, &v, sizeof (v), &junk, 0))
    display_error ("dll_info: Readfile()");

  if (verbose)
    printf (" - os=%d.%d img=%d.%d sys=%d.%d\n",
	    v[0], v[1], v[2], v[3], v[4], v[5]);
  else
    printf ("\n");

  int num_entries = get_dword (fh, opthdr_ofs + 92);
  int export_rva = get_dword (fh, opthdr_ofs + 96);
  int export_size = get_dword (fh, opthdr_ofs + 100);
  int import_rva = get_dword (fh, opthdr_ofs + 104);
  int import_size = get_dword (fh, opthdr_ofs + 108);

  int nsections = get_word (fh, pe_header_offset + 4 + 2);
  char *sections = (char *) malloc (nsections * 40);

  if (SetFilePointer (fh, pe_header_offset + 4 + 20 +
		      get_word (fh, pe_header_offset + 4 + 16), 0,
		      FILE_BEGIN) == INVALID_SET_FILE_POINTER
      && GetLastError () != NO_ERROR)
    display_error ("dll_info: SetFilePointer()");

  if (!ReadFile (fh, sections, nsections * 40, &junk, 0))
    display_error ("dll_info: Readfile()");

  if (verbose && num_entries >= 1 && export_size > 0)
    {
      int expsz;
      int expbase = rva_to_offset (export_rva, sections, nsections, &expsz);

      if (expbase)
	{
	  if (SetFilePointer (fh, expbase, 0, FILE_BEGIN) ==
	      INVALID_SET_FILE_POINTER && GetLastError () != NO_ERROR)
	    display_error ("dll_info: SetFilePointer()");

	  unsigned char *exp = (unsigned char *) malloc (expsz);

	  if (!ReadFile (fh, exp, expsz, &junk, 0))
	    display_error ("dll_info: Readfile()");

	  ExpDirectory *ed = (ExpDirectory *) exp;
	  int ofs = ed->name_rva - export_rva;
	  struct tm *tm = localtime ((const time_t *) &(ed->timestamp));
	  if (tm->tm_year < 60)
	    tm->tm_year += 2000;
	  if (tm->tm_year < 200)
	    tm->tm_year += 1900;
	  printf ("%*c", lvl + 2, ' ');
	  printf ("\"%s\" v%d.%d ts=", exp + ofs,
		  ed->major_ver, ed->minor_ver);
	  printf ("%d/%d/%d %d:%02d\n",
		  tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		  tm->tm_hour, tm->tm_min);
	}
    }

  if (num_entries >= 2 && import_size > 0 && recurse)
    {
      int impsz;
      int impbase = rva_to_offset (import_rva, sections, nsections, &impsz);
      if (impbase)
	{
	  if (SetFilePointer (fh, impbase, 0, FILE_BEGIN) ==
	      INVALID_SET_FILE_POINTER && GetLastError () != NO_ERROR)
	    display_error ("dll_info: SetFilePointer()");

	  unsigned char *imp = (unsigned char *) malloc (impsz);
	  if (imp == NULL)
	    {
	      display_error ("dll_info: malloc()");
	      return;
	    }

	  if (!ReadFile (fh, imp, impsz, &junk, 0))
	    display_error ("dll_info: Readfile()");

	  ImpDirectory *id = (ImpDirectory *) imp;
	  for (i = 0; id[i].name_rva; i++)
	    {
	      /* int ofs = id[i].name_rva - import_rva; */
	      track_down ((char *) imp + id[i].name_rva - import_rva,
			  (char *) ".dll", lvl + 2);
	    }
	}
    }
  if (strstr (path, "\\cygwin1.dll"))
    cygwin_info (fh);
}

// Return true on success, false if error printed
static bool
track_down (char *file, char *suffix, int lvl)
{
  if (file == NULL)
    {
      display_error ("track_down: NULL passed for file", true, false);
      return false;
    }

  if (suffix == NULL)
    {
      display_error ("track_down: NULL passed for suffix", false, false);
      return false;
    }

  char *path = find_on_path (file, suffix, 0, 1);
  if (!path)
    {
      printf ("Error: could not find %s\n", file);
      return false;
    }

  Did *d = already_did (file);
  switch (d->state)
    {
    case DID_NEW:
      break;
    case DID_ACTIVE:
      if (verbose)
	{
	  if (lvl)
	    printf ("%*c", lvl, ' ');
	  printf ("%s", path);
	  printf (" (recursive)\n");
	}
      return true;
    case DID_INACTIVE:
      if (verbose)
	{
	  if (lvl)
	    printf ("%*c", lvl, ' ');
	  printf ("%s", path);
	  printf (" (already done)\n");
	}
      return true;
    default:
      break;
    }

  if (lvl)
    printf ("%*c", lvl, ' ');

  if (!path)
    {
      printf ("%s not found\n", file);
      return false;
    }

  printf ("%s", path);

  HANDLE fh =
    CreateFile (path, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
		NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
  if (fh == INVALID_HANDLE_VALUE)
    {
      printf (" - Cannot open\n");
      return false;
    }

  d->state = DID_ACTIVE;

  dll_info (path, fh, lvl, 1);
  d->state = DID_INACTIVE;
  if (!CloseHandle (fh))
    display_error ("track_down: CloseHandle()");
  return true;
}

static void
ls (char *f)
{
  HANDLE h = CreateFile (f, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
			 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  BY_HANDLE_FILE_INFORMATION info;

  if (!GetFileInformationByHandle (h, &info))
    display_error ("ls: GetFileInformationByHandle()");

  SYSTEMTIME systime;

  if (!FileTimeToSystemTime (&info.ftLastWriteTime, &systime))
    display_error ("ls: FileTimeToSystemTime()");
  printf ("%5dk %04d/%02d/%02d %s",
	  (((int) info.nFileSizeLow) + 512) / 1024,
	  systime.wYear, systime.wMonth, systime.wDay, f);
  dll_info (f, h, 16, 0);
  if (!CloseHandle (h))
    display_error ("ls: CloseHandle()");
}

// Return true on success, false if error printed
static bool
cygcheck (char *app)
{
  char *papp = find_on_path (app, (char *) ".exe", 1, 0);
  if (!papp)
    {
      printf ("Error: could not find %s\n", app);
      return false;
    }
  char *s = strdup (papp);
  char *sl = 0, *t;
  for (t = s; *t; t++)
    if (*t == '/' || *t == '\\' || *t == ':')
      sl = t;
  if (sl == 0)
    paths[0] = (char *) ".";
  else
    {
      *sl = 0;
      paths[0] = s;
    }
  did = 0;
  return track_down (papp, (char *) ".exe", 0);
}


extern char **environ;

struct RegInfo
{
  RegInfo *prev;
  char *name;
  HKEY key;
};

static void
show_reg (RegInfo * ri, int nest)
{
  if (!ri)
    return;
  show_reg (ri->prev, 1);
  if (nest)
    printf ("%s\\", ri->name);
  else
    printf ("%s\n", ri->name);
}

static void
scan_registry (RegInfo * prev, HKEY hKey, char *name, int cygnus)
{
  RegInfo ri;
  ri.prev = prev;
  ri.name = name;
  ri.key = hKey;

  char *cp;
  for (cp = name; *cp; cp++)
    if (strncasecmp (cp, "cygnus", 6) == 0)
      cygnus = 1;

  DWORD num_subkeys, max_subkey_len, num_values;
  DWORD max_value_len, max_valdata_len, i;
  if (RegQueryInfoKey (hKey, 0, 0, 0, &num_subkeys, &max_subkey_len, 0,
		       &num_values, &max_value_len, &max_valdata_len, 0, 0)
      != ERROR_SUCCESS)
    {
#if 0
      char tmp[400];
      FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, 0, GetLastError (),
		     MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), tmp, 400, 0);
      printf ("RegQueryInfoKey: %s\n", tmp);
#endif
      return;
    }

  if (cygnus)
    {
      show_reg (&ri, 0);

      char *value_name = (char *) malloc (max_value_len + 1);
      if (value_name == NULL)
	{
	  display_error ("scan_registry: malloc()");
	  return;
	}

      char *value_data = (char *) malloc (max_valdata_len + 1);
      if (value_data == NULL)
	{
	  display_error ("scan_registry: malloc()");
	  return;
	}

      for (i = 0; i < num_values; i++)
	{
	  DWORD dlen = max_valdata_len + 1;
	  DWORD nlen = max_value_len + 1;
	  DWORD type;
	  RegEnumValue (hKey, i, value_name, &nlen, 0,
			&type, (BYTE *) value_data, &dlen);
	  {
	    printf ("  %s = ", i ? value_name : "(default)");
	    switch (type)
	      {
	      case REG_DWORD:
		printf ("0x%08x\n", *(unsigned *) value_data);
		break;
	      case REG_EXPAND_SZ:
	      case REG_SZ:
		printf ("`%s'\n", value_data);
		break;
	      default:
		printf ("(unsupported type)\n");
		break;
	      }
	  }
	}
      free (value_name);
      free (value_data);
    }

  char *subkey_name = (char *) malloc (max_subkey_len + 1);
  for (i = 0; i < num_subkeys; i++)
    {
      if (RegEnumKey (hKey, i, subkey_name, max_subkey_len + 1) ==
	  ERROR_SUCCESS)
	{
	  HKEY sKey;
	  if (RegOpenKeyEx (hKey, subkey_name, 0, KEY_READ, &sKey)
	      == ERROR_SUCCESS)
	    {
	      scan_registry (&ri, sKey, subkey_name, cygnus);
	      if (RegCloseKey (sKey) != ERROR_SUCCESS)
		display_error ("scan_registry: RegCloseKey()");
	    }
	}
    }
  free (subkey_name);
}

void
pretty_id (const char *s, char *cygwin, size_t cyglen)
{
  char *groups[16384];

  strcpy (cygwin + cyglen++, " ");
  strcpy (cygwin + cyglen, s);
  putenv (cygwin);

  char *id = cygpath ("/bin/id.exe", NULL);
  for (char *p = id; (p = strchr (p, '/')); p++)
    *p = '\\';

  if (access (id, X_OK))
    {
      fprintf (stderr, "`id' program not found\n");
      return;
    }

  FILE *f = popen (id, "rt");

  char buf[16384];
  buf[0] = '\0';
  fgets (buf, sizeof (buf), f);
  pclose (f);
  char *uid = strtok (buf, ")");
  if (uid)
    uid += strlen ("uid=");
  else
    {
      fprintf (stderr, "garbled output from `id' command - no uid= found\n");
      return;
    }
  char *gid = strtok (NULL, ")");
  if (gid)
    gid += strlen ("gid=") + 1;
  else
    {
      fprintf (stderr, "garbled output from `id' command - no gid= found\n");
      return;
    }

  char **ng = groups - 1;
  size_t len_uid = strlen ("UID: )") + strlen (uid);
  size_t len_gid = strlen ("GID: )") + strlen (gid);
  *++ng = groups[0] = (char *) alloca (len_uid + 1);
  *++ng = groups[1] = (char *) alloca (len_gid + 1);
  sprintf (groups[0], "UID: %s)", uid);
  sprintf (groups[1], "GID: %s)", gid);
  size_t sz = max (len_uid, len_gid);
  while ((*++ng = strtok (NULL, ",")))
    {
      char *p = strchr (*ng, '\n');
      if (p)
	*p = '\0';
      if (ng == groups + 2)
	*ng += strlen (" groups=");
      size_t len = strlen (*ng);
      if (sz < len)
	sz = len;
    }
  ng--;

  printf ("\nOutput from %s (%s)\n", id, s);
  int n = 80 / (int) ++sz;
  int i = n > 2 ? n - 2 : 0;
  sz = -sz;
  for (char **g = groups; g <= ng; g++)
    if ((g != ng) && (++i < n))
      printf ("%*s", sz, *g);
    else
      {
	puts (*g);
	i = 0;
      }
}

/* This dumps information about each installed cygwin service, if cygrunsrv
   is available.  */
void
dump_sysinfo_services ()
{
  char buf[1024];
  char buf2[1024];
  FILE *f;
  bool no_services = false;

  if (givehelp)
    printf ("\nChecking for any Cygwin services... %s\n\n",
		  verbose ? "" : "(use -v for more detail)");
  else
    fputc ('\n', stdout);

  /* find the location of cygrunsrv.exe */
  char *cygrunsrv = cygpath ("/bin/cygrunsrv.exe", NULL);
  for (char *p = cygrunsrv; (p = strchr (p, '/')); p++)
    *p = '\\';

  if (access (cygrunsrv, X_OK))
    {
      puts ("Can't find the cygrunsrv utility, skipping services check.\n");
      return;
    }

  /* check for a recent cygrunsrv */
  snprintf (buf, sizeof (buf), "%s --version", cygrunsrv);
  if ((f = popen (buf, "rt")) == NULL)
    {
      printf ("Failed to execute '%s', skipping services check.\n", buf);
      return;
    }
  int maj, min;
  int ret = fscanf (f, "cygrunsrv V%u.%u", &maj, &min);
  if (ferror (f) || feof (f) || ret == EOF || maj < 1 || min < 10)
    {
      puts ("The version of cygrunsrv installed is too old to dump service info.\n");
      return;
    }
  fclose (f);

  /* For verbose mode, just run cygrunsrv --list --verbose and copy output
     verbatim; otherwise run cygrunsrv --list and then cygrunsrv --query for
     each service.  */
  snprintf (buf, sizeof (buf), (verbose ? "%s --list --verbose" : "%s --list"),
	    cygrunsrv);
  if ((f = popen (buf, "rt")) == NULL)
    {
      printf ("Failed to execute '%s', skipping services check.\n", buf);
      return;
    }

  if (verbose)
    {
      /* copy output to stdout */
      size_t nchars = 0;
      while (!feof (f) && !ferror (f))
	  nchars += fwrite ((void *) buf, 1,
			    fread ((void *) buf, 1, sizeof (buf), f), stdout);

      /* cygrunsrv outputs nothing if there are no cygwin services found */
      if (nchars < 1)
	no_services = true;
      pclose (f);
    }
  else
    {
      /* read the output of --list, and then run --query for each service */
      size_t nchars = fread ((void *) buf, 1, sizeof (buf) - 1, f);
      buf[nchars] = 0;
      pclose (f);

      if (nchars > 0)
	for (char *srv = strtok (buf, "\n"); srv; srv = strtok (NULL, "\n"))
	  {
	    snprintf (buf2, sizeof (buf2), "%s --query %s", cygrunsrv, srv);
	    if ((f = popen (buf2, "rt")) == NULL)
	      {
		printf ("Failed to execute '%s', skipping services check.\n", buf2);
		return;
	      }

	    /* copy output to stdout */
	    while (!feof (f) && !ferror (f))
	      fwrite ((void *) buf2, 1,
		      fread ((void *) buf2, 1, sizeof (buf2), f), stdout);
	    pclose (f);
	  }
      else
	no_services = true;
    }

  /* inform the user if nothing found */
  if (no_services)
    puts ("No Cygwin services found.\n");
}

static void
dump_sysinfo ()
{
  int i, j;
  char tmp[4000];
  time_t now;
  char *found_cygwin_dll;
  bool is_nt = false;

  printf ("\nCygwin Configuration Diagnostics\n");
  time (&now);
  printf ("Current System Time: %s\n", ctime (&now));

  OSVERSIONINFO osversion;
  osversion.dwOSVersionInfoSize = sizeof (osversion);
  if (!GetVersionEx (&osversion))
    display_error ("dump_sysinfo: GetVersionEx()");
  char *osname = (char *) "unknown OS";
  switch (osversion.dwPlatformId)
    {
    case VER_PLATFORM_WIN32s:
      osname = (char *) "32s";
      break;
    case VER_PLATFORM_WIN32_WINDOWS:
      switch (osversion.dwMinorVersion)
	{
	case 0:
	  if (strchr (osversion.szCSDVersion, 'C'))
	    osname = (char *) "95 OSR2";
	  else
	    osname = (char *) "95";
	  break;
	case 10:
	  if (strchr (osversion.szCSDVersion, 'A'))
	    osname = (char *) "98 SE";
	  else
	    osname = (char *) "98";
	  break;
	case 90:
	  osname = (char *) "ME";
	  break;
	default:
	  osname = (char *) "9X";
	  break;
	}
      break;
    case VER_PLATFORM_WIN32_NT:
      is_nt = true;
      if (osversion.dwMajorVersion == 5)
	{
	  BOOL more_info = FALSE;
	  OSVERSIONINFOEX osversionex;
	  osversionex.dwOSVersionInfoSize = sizeof (osversionex);
	  if (GetVersionEx ((OSVERSIONINFO *) &osversionex))
	    more_info = TRUE;
	  if (osversion.dwMinorVersion == 0)
	    {
	      if (!more_info)
		osname = (char *) "2000";
	      else if (osversionex.wProductType == VER_NT_SERVER
		       || osversionex.wProductType == VER_NT_DOMAIN_CONTROLLER)
		{
		  if (osversionex.wSuiteMask & VER_SUITE_DATACENTER)
		    osname = (char *) "2000 Datacenter Server";
		  else if (osversionex.wSuiteMask & VER_SUITE_ENTERPRISE)
		    osname = (char *) "2000 Advanced Server";
		  else
		    osname = (char *) "2000 Server";
		}
	      else
		osname = (char *) "2000 Professional";
	    }
	  else if (osversion.dwMinorVersion == 1)
	    {
	      if (GetSystemMetrics (SM_MEDIACENTER))
	        osname = (char *) "XP Media Center Edition";
	      else if (GetSystemMetrics (SM_TABLETPC))
	        osname = (char *) "XP Tablet PC Edition";
	      else if (!more_info)
		osname = (char *) "XP";
	      else if (osversionex.wSuiteMask & VER_SUITE_PERSONAL)
	        osname = (char *) "XP Home Edition";
	      else
	        osname = (char *) "XP Professional";
	    }
	  else if (osversion.dwMinorVersion == 2)
	    {
	      if (!more_info)
		osname = (char *) "2003 Server";
	      else if (osversionex.wSuiteMask & VER_SUITE_BLADE)
		osname = (char *) "2003 Web Server";
	      else if (osversionex.wSuiteMask & VER_SUITE_DATACENTER)
		osname = (char *) "2003 Datacenter Server";
	      else if (osversionex.wSuiteMask & VER_SUITE_ENTERPRISE)
		osname = (char *) "2003 Enterprise Server";
	      else
		osname = (char *) "2003 Server";
	    }
	}
      else
	osname = (char *) "NT";
      break;
    default:
      osname = (char *) "??";
      break;
    }
  printf ("Windows %s Ver %lu.%lu Build %lu %s\n\n", osname,
	  osversion.dwMajorVersion, osversion.dwMinorVersion,
	  osversion.dwPlatformId == VER_PLATFORM_WIN32_NT ?
	  osversion.dwBuildNumber : (osversion.dwBuildNumber & 0xffff),
	  osversion.dwPlatformId == VER_PLATFORM_WIN32_NT ?
	  osversion.szCSDVersion : "");
  if (GetSystemMetrics (SM_REMOTESESSION))
    printf ("Running in Terminal Service session\n\n");

  printf ("Path:");
  char *s = getenv ("PATH"), *e;
  if (!s)
    puts ("");
  else
    {
      char sep = strchr (s, ';') ? ';' : ':';
      int count_path_items = 0;
      while (1)
	{
	  for (e = s; *e && *e != sep; e++);
	  if (e-s)
	    printf ("\t%.*s\n", e - s, s);
	  else
	    puts ("\t.");
	  count_path_items++;
	  if (!*e)
	    break;
	  s = e + 1;
	}
    }

  fflush (stdout);

  char *cygwin = getenv ("CYGWIN");
  if (cygwin)
    cygwin -= strlen ("CYGWIN=");
  else
    cygwin = const_cast <char *> ("CYGWIN=");
  size_t cyglen = strlen (cygwin);
  cygwin = strcpy ((char *) malloc (cyglen + sizeof (" nontsec")), cygwin);
  pretty_id ("nontsec", cygwin, cyglen);
  pretty_id ("ntsec", cygwin, cyglen);
  cygwin[cyglen] = 0;
  putenv (cygwin);

  if (!GetSystemDirectory (tmp, 4000))
    display_error ("dump_sysinfo: GetSystemDirectory()");
  printf ("\nSysDir: %s\n", tmp);

  GetWindowsDirectory (tmp, 4000);
  printf ("WinDir: %s\n\n", tmp);


  if (givehelp)
    printf ("Here's some environment variables that may affect cygwin:\n");
  for (i = 0; environ[i]; i++)
    {
      char *eq = strchr (environ[i], '=');
      if (!eq)
	continue;
      /* int len = eq - environ[i]; */
      for (j = 0; known_env_vars[j]; j++)
	{
	  *eq = 0;
	  if (strcmp (environ[i], "PATH") == 0)
	    continue;		/* we handle this one specially */
	  if (strcasecmp (environ[i], known_env_vars[j]) == 0)
	    printf ("%s = `%s'\n", environ[i], eq + 1);
	  *eq = '=';
	}
    }
  printf ("\n");

  if (verbose)
    {
      if (givehelp)
	printf ("Here's the rest of your environment variables:\n");
      for (i = 0; environ[i]; i++)
	{
	  int found = 0;
	  char *eq = strchr (environ[i], '=');
	  if (!eq)
	    continue;
	  /* int len = eq - environ[i]; */
	  for (j = 0; known_env_vars[j]; j++)
	    {
	      *eq = 0;
	      if (strcasecmp (environ[i], known_env_vars[j]) == 0)
		found = 1;
	      *eq = '=';
	    }
	  if (!found)
	    {
	      *eq = 0;
	      printf ("%s = `%s'\n", environ[i], eq + 1);
	      *eq = '=';
	    }
	}
      printf ("\n");
    }

  if (registry)
    {
      if (givehelp)
	printf ("Scanning registry for keys with `Cygnus' in them...\n");
#if 0
      /* big and not generally useful */
      scan_registry (0, HKEY_CLASSES_ROOT, (char *) "HKEY_CLASSES_ROOT", 0);
#endif
      scan_registry (0, HKEY_CURRENT_CONFIG,
		     (char *) "HKEY_CURRENT_CONFIG", 0);
      scan_registry (0, HKEY_CURRENT_USER, (char *) "HKEY_CURRENT_USER", 0);
      scan_registry (0, HKEY_LOCAL_MACHINE, (char *) "HKEY_LOCAL_MACHINE", 0);
#if 0
      /* the parts we need are duplicated in HKEY_CURRENT_USER anyway */
      scan_registry (0, HKEY_USERS, (char *) "HKEY_USERS", 0);
#endif
      printf ("\n");
    }
  else
    printf ("Use `-r' to scan registry\n\n");

  if (givehelp)
    {
      printf ("Listing available drives...\n");
      printf ("Drv Type          Size   Used Flags              Name\n");
    }
  int prev_mode =
    SetErrorMode (SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
  int drivemask = GetLogicalDrives ();

  HINSTANCE k32 = LoadLibrary ("kernel32.dll");
  BOOL (WINAPI * gdfse) (LPCSTR, long long *, long long *, long long *) =
    (BOOL (WINAPI *) (LPCSTR, long long *, long long *, long long *))
    GetProcAddress (k32, "GetDiskFreeSpaceExA");

  for (i = 0; i < 26; i++)
    {
      if (!(drivemask & (1 << i)))
	continue;
      char drive[4], name[200], fsname[200];
      DWORD serno = 0, maxnamelen = 0, flags = 0;
      name[0] = name[0] = fsname[0] = 0;
      sprintf (drive, "%c:\\", i + 'a');
      /* Report all errors, except if the Volume is ERROR_NOT_READY.
	 ERROR_NOT_READY is returned when removeable media drives are empty
	 (CD, floppy, etc.) */
      if (!GetVolumeInformation
	  (drive, name, sizeof (name), &serno, &maxnamelen, &flags, fsname,
	   sizeof (fsname)) && GetLastError () != ERROR_NOT_READY)
	display_error ("dump_sysinfo: GetVolumeInformation()");

      int dtype = GetDriveType (drive);
      char drive_type[4] = "unk";
      switch (dtype)
	{
	case DRIVE_REMOVABLE:
	  strcpy (drive_type, "fd ");
	  break;
	case DRIVE_FIXED:
	  strcpy (drive_type, "hd ");
	  break;
	case DRIVE_REMOTE:
	  strcpy (drive_type, "net");
	  break;
	case DRIVE_CDROM:
	  strcpy (drive_type, "cd ");
	  break;
	case DRIVE_RAMDISK:
	  strcpy (drive_type, "ram");
	  break;
	default:
	  strcpy (drive_type, "unk");
	}

      long capacity_mb = -1;
      int percent_full = -1;

      long long free_me = 0ULL, free_bytes = 0ULL, total_bytes = 1ULL;
      if (gdfse != NULL && gdfse (drive, &free_me, &total_bytes, &free_bytes))
	{
	  capacity_mb = total_bytes / (1024L * 1024L);
	  percent_full = 100 - (int) ((100.0 * free_me) / total_bytes);
	}
      else
	{
	  DWORD spc = 0, bps = 0, fc = 0, tc = 1;
	  if (GetDiskFreeSpace (drive, &spc, &bps, &fc, &tc))
	    {
	      capacity_mb = (spc * bps * tc) / (1024 * 1024);
	      percent_full = 100 - (int) ((100.0 * fc) / tc);
	    }
	}

      printf ("%.2s  %s %-6s ", drive, drive_type, fsname);
      if (capacity_mb >= 0)
	printf ("%7dMb %3d%% ", (int) capacity_mb, (int) percent_full);
      else
	printf ("    N/A    N/A ");
      printf ("%s %s %s %s %s %s  %s\n",
	      flags & FS_CASE_IS_PRESERVED ? "CP" : "  ",
	      flags & FS_CASE_SENSITIVE ? "CS" : "  ",
	      flags & FS_UNICODE_STORED_ON_DISK ? "UN" : "  ",
	      flags & FS_PERSISTENT_ACLS ? "PA" : "  ",
	      flags & FS_FILE_COMPRESSION ? "FC" : "  ",
	      flags & FS_VOL_IS_COMPRESSED ? "VC" : "  ",
#if 0
	      flags & FILE_SUPPORTS_ENCRYPTION ? "EN" : "  ",
	      flags & FILE_SUPPORTS_OBJECT_IDS ? "OI" : "  ",
	      flags & FILE_SUPPORTS_REPARSE_POINTS ? "RP" : "  ",
	      flags & FILE_SUPPORTS_SPARSE_FILES ? "SP" : "  ",
	      flags & FILE_VOLUME_QUOTAS ? "QU" : "  ",
#endif
	      name);
    }

  if (!FreeLibrary (k32))
    display_error ("dump_sysinfo: FreeLibrary()");
  SetErrorMode (prev_mode);
  if (givehelp)
    {
      puts ("\n"
	  "fd = floppy,          hd = hard drive,       cd = CD-ROM\n"
	  "net= Network Share,   ram= RAM drive,        unk= Unknown\n"
	  "CP = Case Preserving, CS = Case Sensitive,   UN = Unicode\n"
	  "PA = Persistent ACLS, FC = File Compression, VC = Volume Compression");
    }
  printf ("\n");

  unsigned ml_fsname = 4, ml_dir = 7, ml_type = 6;
  bool ml_trailing = false;

  struct mntent *mnt;
  setmntent (0, 0);
  while ((mnt = getmntent (0)))
    {
      unsigned n = (int) strlen (mnt->mnt_fsname);
      ml_trailing |= (n > 1 && strchr ("\\/", mnt->mnt_fsname[n - 1]));
      if (ml_fsname < n)
	ml_fsname = n;
      n = (int) strlen (mnt->mnt_dir);
      ml_trailing |= (n > 1 && strchr ("\\/", mnt->mnt_dir[n - 1]));
      if (ml_dir < n)
	ml_dir = n;
    }

  if (ml_trailing)
    puts ("Warning: Mount entries should not have a trailing (back)slash\n");

  if (givehelp)
    {
      printf
	("Mount entries: these map POSIX directories to your NT drives.\n");
      printf ("%-*s  %-*s  %-*s  %s\n", ml_fsname, "-NT-", ml_dir, "-POSIX-",
	      ml_type, "-Type-", "-Flags-");
    }

  setmntent (0, 0);
  while ((mnt = getmntent (0)))
    {
      printf ("%-*s  %-*s  %-*s  %s\n",
	      ml_fsname, mnt->mnt_fsname,
	      ml_dir, mnt->mnt_dir, ml_type, mnt->mnt_type, mnt->mnt_opts);
    }
  printf ("\n");

  add_path ((char *) "\\bin", 4);	/* just in case */

  if (givehelp)
    printf
      ("Looking to see where common programs can be found, if at all...\n");
  for (i = 0; common_apps[i].name; i++)
    if (!find_on_path ((char *) common_apps[i].name, (char *) ".exe", 1, 0))
      {
	if (common_apps[i].missing_is_good)
	  printf ("Not Found: %s (good!)\n", common_apps[i].name);
	else
	  printf ("Not Found: %s\n", common_apps[i].name);
      }
  printf ("\n");

  if (givehelp)
    printf ("Looking for various Cygwin DLLs...  (-v gives version info)\n");
  int cygwin_dll_count = 0;
  for (i = 1; i < num_paths; i++)
    {
      WIN32_FIND_DATA ffinfo;
      sprintf (tmp, "%s/*.*", paths[i]);
      HANDLE ff = FindFirstFile (tmp, &ffinfo);
      int found = (ff != INVALID_HANDLE_VALUE);
      found_cygwin_dll = NULL;
      while (found)
	{
	  char *f = ffinfo.cFileName;
	  if (strcasecmp (f + strlen (f) - 4, ".dll") == 0)
	    {
	      if (strncasecmp (f, "cyg", 3) == 0)
		{
		  sprintf (tmp, "%s\\%s", paths[i], f);
		  if (strcasecmp (f, "cygwin1.dll") == 0)
		    {
		      cygwin_dll_count++;
		      found_cygwin_dll = strdup (tmp);
		    }
		  else
		    ls (tmp);
		}
	    }
	  found = FindNextFile (ff, &ffinfo);
	}
      if (found_cygwin_dll)
	{
	  ls (found_cygwin_dll);
	  free (found_cygwin_dll);
	}

      FindClose (ff);
    }
  if (cygwin_dll_count > 1)
    puts ("Warning: There are multiple cygwin1.dlls on your path");
  if (!cygwin_dll_count)
    puts ("Warning: cygwin1.dll not found on your path");

  if (is_nt)
    dump_sysinfo_services ();
}

static int
check_keys ()
{
  HANDLE h = CreateFileA ("CONIN$", GENERIC_READ | GENERIC_WRITE,
			  FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
			  OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

  if (h == INVALID_HANDLE_VALUE || h == NULL)
    return (display_error ("check_keys: Opening CONIN$"));

  DWORD mode;

  if (!GetConsoleMode (h, &mode))
    display_error ("check_keys: GetConsoleMode()");
  else
    {
      mode &= ~ENABLE_PROCESSED_INPUT;
      if (!SetConsoleMode (h, mode))
	display_error ("check_keys: SetConsoleMode()");
    }

  fputs ("\nThis key check works only in a console window,", stderr);
  fputs (" _NOT_ in a terminal session!\n", stderr);
  fputs ("Abort with Ctrl+C if in a terminal session.\n\n", stderr);
  fputs ("Press `q' to exit.\n", stderr);

  INPUT_RECORD in, prev_in;

  // Drop first <RETURN> key
  ReadConsoleInput (h, &in, 1, &mode);

  memset (&in, 0, sizeof in);

  do
    {
      prev_in = in;
      if (!ReadConsoleInput (h, &in, 1, &mode))
	display_error ("check_keys: ReadConsoleInput()");

      if (!memcmp (&in, &prev_in, sizeof in))
	continue;

      switch (in.EventType)
	{
	case KEY_EVENT:
	  printf ("%s %ux VK: 0x%02x VS: 0x%02x A: 0x%02x CTRL: ",
		  in.Event.KeyEvent.bKeyDown ? "Pressed " : "Released",
		  in.Event.KeyEvent.wRepeatCount,
		  in.Event.KeyEvent.wVirtualKeyCode,
		  in.Event.KeyEvent.wVirtualScanCode,
		  (unsigned char) in.Event.KeyEvent.uChar.AsciiChar);
	  fputs (in.Event.KeyEvent.dwControlKeyState & CAPSLOCK_ON ?
		 "CL " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & ENHANCED_KEY ?
		 "EK " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & LEFT_ALT_PRESSED ?
		 "LA " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & LEFT_CTRL_PRESSED ?
		 "LC " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & NUMLOCK_ON ?
		 "NL " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & RIGHT_ALT_PRESSED ?
		 "RA " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & RIGHT_CTRL_PRESSED ?
		 "RC " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & SCROLLLOCK_ON ?
		 "SL " : "-- ", stdout);
	  fputs (in.Event.KeyEvent.dwControlKeyState & SHIFT_PRESSED ?
		 "SH " : "-- ", stdout);
	  fputc ('\n', stdout);
	  break;

	default:
	  break;
	}
    }
  while (in.EventType != KEY_EVENT ||
	 in.Event.KeyEvent.bKeyDown != FALSE ||
	 in.Event.KeyEvent.uChar.AsciiChar != 'q');

  CloseHandle (h);
  return 0;
}

/* RFC1738 says that these do not need to be escaped.  */
static const char safe_chars[] = "$-_.+!*'(),";

/* the URL to query.  */
static const char base_url[] =
        "http://cygwin.com/cgi-bin2/package-grep.cgi?text=1&grep=";

/* Queries Cygwin web site for packages containing files matching a regexp.
   Return value is 1 if there was a problem, otherwise 0.  */
static int
package_grep (char *search)
{
  char buf[1024];

  /* construct the actual URL by escaping  */
  char *url = (char *) alloca (sizeof (base_url) + strlen (search) * 3);
  strcpy (url, base_url);

  char *dest;
  for (dest = &url[sizeof (base_url) - 1]; *search; search++)
    {
      if (isalnum (*search)
          || memchr (safe_chars, *search, sizeof (safe_chars) - 1))
        {
          *dest++ = *search;
        }
      else
        {
          *dest++ = '%';
          sprintf (dest, "%02x", (unsigned char) *search);
          dest += 2;
        }
    }
  *dest = 0;

  /* Connect to the net and open the URL.  */
  if (InternetAttemptConnect (0) != ERROR_SUCCESS)
    {
      fputs ("An internet connection is required for this function.\n", stderr);
      return 1;
    }

  /* Initialize WinInet and attempt to fetch our URL.  */
  HINTERNET hi = NULL, hurl = NULL;
  if (!(hi = InternetOpen ("cygcheck", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0)))
    return display_internet_error ("InternetOpen() failed", NULL);

  if (!(hurl = InternetOpenUrl (hi, url, NULL, 0, 0, 0)))
    return display_internet_error ("unable to contact cygwin.com site, "
                                   "InternetOpenUrl() failed", hi, NULL);

  /* Check the HTTP response code.  */
  DWORD rc = 0, rc_s = sizeof (DWORD);
  if (!HttpQueryInfo (hurl, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER,
                      (void *) &rc, &rc_s, NULL))
    return display_internet_error ("HttpQueryInfo() failed", hurl, hi, NULL);

  if (rc != HTTP_STATUS_OK)
    {
      sprintf (buf, "error retrieving results from cygwin.com site, "
                    "HTTP status code %lu", rc);
      return display_internet_error (buf, hurl, hi, NULL);
    }

  /* Fetch result and print to stdout.  */
  DWORD numread;
  do
    {
      if (!InternetReadFile (hurl, (void *) buf, sizeof (buf), &numread))
        return display_internet_error ("InternetReadFile failed", hurl, hi, NULL);
      if (numread)
        fwrite ((void *) buf, (size_t) numread, 1, stdout);
    }
  while (numread);

  InternetCloseHandle (hurl);
  InternetCloseHandle (hi);
  return 0;
}

static void
usage (FILE * stream, int status)
{
  fprintf (stream, "\
Usage: cygcheck PROGRAM [ -v ] [ -h ]\n\
       cygcheck -c [ PACKAGE ] [ -d ]\n\
       cygcheck -s [ -r ] [ -v ] [ -h ]\n\
       cygcheck -k\n\
       cygcheck -f FILE [ FILE ... ]\n\
       cygcheck -l [ PACKAGE ] [ PACKAGE ... ]\n\
       cygcheck -p REGEXP\n\
List system information, check installed packages, or query package database.\n\
\n\
At least one command option or a PROGRAM is required, as shown above.\n\
\n\
  PROGRAM              list library (DLL) dependencies of PROGRAM\n\
  -c, --check-setup    show installed version of PACKAGE and verify integrity\n\
                       (or for all installed packages if none specified)\n\
  -d, --dump-only      just list packages, do not verify (with -c)\n\
  -s, --sysinfo        produce diagnostic system information (implies -c -d)\n\
  -r, --registry       also scan registry for Cygwin settings (with -s)\n\
  -k, --keycheck       perform a keyboard check session (must be run from a\n\
                       plain console only, not from a pty/rxvt/xterm)\n\
  -f, --find-package   find the package that FILE belongs to\n\
  -l, --list-package   list contents of PACKAGE (or all packages if none given)\n\
  -p, --package-query  search for REGEXP in the entire cygwin.com package\n\
                       repository (requies internet connectivity)\n\
  -v, --verbose        produce more verbose output\n\
  -h, --help           annotate output with explanatory comments when given\n\
                       with another command, otherwise print this help\n\
  -V, --version        print the version of cygcheck and exit\n\
\n\
Note: -c, -f, and -l only report on packages that are currently installed. To\n\
  search all official Cygwin packages use -p instead.  The -p REGEXP matches\n\
  package names, descriptions, and names of files/paths within all packages.\n\
\n");
  exit (status);
}

struct option longopts[] = {
  {"check-setup", no_argument, NULL, 'c'},
  {"dump-only", no_argument, NULL, 'd'},
  {"sysinfo", no_argument, NULL, 's'},
  {"registry", no_argument, NULL, 'r'},
  {"verbose", no_argument, NULL, 'v'},
  {"keycheck", no_argument, NULL, 'k'},
  {"find-package", no_argument, NULL, 'f'},
  {"list-package", no_argument, NULL, 'l'},
  {"package-query", no_argument, NULL, 'p'},
  {"help", no_argument, NULL, 'h'},
  {"version", no_argument, 0, 'V'},
  {0, no_argument, NULL, 0}
};

static char opts[] = "cdsrvkflphV";

static void
print_version ()
{
  const char *v = strchr (version, ':');
  int len;
  if (!v)
    {
      v = "?";
      len = 1;
    }
  else
    {
      v += 2;
      len = strchr (v, ' ') - v;
    }
  printf ("\
cygcheck version %.*s\n\
System Checker for Cygwin\n\
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Red Hat, Inc.\n\
Compiled on %s\n\
", len, v, __DATE__);
}

void
nuke (char *ev)
{
  int n = 1 + strchr (ev, '=') - ev;
  char *s = (char *) alloca (n + 1);
  memcpy (s, ev, n);
  s[n] = '\0';
  putenv (s);
}

extern "C" {
unsigned long (*cygwin_internal) (int, ...);
};

static void
load_cygwin (int& argc, char **&argv)
{
  HMODULE h;

  if (!(h = LoadLibrary ("cygwin1.dll")))
    return;
  if (!(cygwin_internal = (DWORD (*) (int, ...)) GetProcAddress (h, "cygwin_internal")))
    return;

  char **av = (char **) cygwin_internal (CW_ARGV);
  if (av && ((DWORD) av != (DWORD) -1))
    for (argc = 0, argv = av; *av; av++)
      argc++;

  char **envp = (char **) cygwin_internal (CW_ENVP);
  if (envp && ((DWORD) envp != (DWORD) -1))
    {
      /* Store path and revert to this value, otherwise path gets overwritten
	 by the POSIXy Cygwin variation, which breaks cygcheck.
	 Another approach would be to use the Cygwin PATH and convert it to
	 Win32 again. */
      char *path = NULL;
      char **env;
      while (*(env = _environ))
	{
	  if (strncmp (*env, "PATH=", 5) == 0)
	    path = strdup (*env);
	  nuke (*env);
	}
      for (char **ev = envp; *ev; ev++)
	if (strncmp (*ev, "PATH=", 5) != 0)
	 putenv (*ev);
      if (path)
	putenv (path);
    }
}

int
main (int argc, char **argv)
{
  int i;
  bool ok = true;
  load_cygwin (argc, argv);

  (void) putenv("POSIXLY_CORRECT=1");
  while ((i = getopt_long (argc, argv, opts, longopts, NULL)) != EOF)
    switch (i)
      {
      case 's':
	sysinfo = 1;
	break;
      case 'c':
	check_setup = 1;
	break;
      case 'd':
	dump_only = 1;
	break;
      case 'r':
	registry = 1;
	break;
      case 'v':
	verbose = 1;
	break;
      case 'k':
	keycheck = 1;
	break;
      case 'f':
	find_package = 1;
	break;
      case 'l':
	list_package = 1;
	break;
      case 'p':
        grep_packages = 1;
        break;
      case 'h':
	givehelp = 1;
	break;
      case 'V':
	print_version ();
	exit (0);
      default:
	usage (stderr, 1);
       /*NOTREACHED*/}
  argc -= optind;
  argv += optind;

  if (argc == 0 && !sysinfo && !keycheck && !check_setup && !list_package)
    if (givehelp)
      usage (stdout, 0);
    else
      usage (stderr, 1);

  if ((check_setup || sysinfo || find_package || list_package || grep_packages)
      && keycheck)
    usage (stderr, 1);

  if ((find_package || list_package || grep_packages) && check_setup)
    usage (stderr, 1);

  if (dump_only && !check_setup)
    usage (stderr, 1);

  if (find_package + list_package + grep_packages > 1)
    usage (stderr, 1);

  if (keycheck)
    return check_keys ();
  if (grep_packages)
    return package_grep (*argv);

  init_paths ();

  /* FIXME: Add help for check_setup and {list,find}_package */
  if (argc >= 1 && givehelp && !check_setup && !find_package && !list_package)
    {
      printf("Here is where the OS will find your program%s, and which dlls\n",
	     argc > 1 ? "s" : "");
      printf ("will be used for it.  Use -v to see DLL version info\n");

      if (!sysinfo)
	printf ("\n");
    }

  if (check_setup)
    dump_setup (verbose, argv, !dump_only);
  else if (find_package)
    package_find (verbose, argv);
  else if (list_package)
    package_list (verbose, argv);
  else
    for (i = 0; i < argc; i++)
      {
	if (i)
	  puts ("");
       ok &= cygcheck (argv[i]);
      }

  if (sysinfo)
    {
      dump_sysinfo ();
      if (!check_setup)
	{
	  puts ("");
	  dump_setup (verbose, NULL, false);
	}

      if (!givehelp)
	puts ("Use -h to see help about each section");
    }

  return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}