/*

 * Copyright © 2011 Canonical Limited

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 *

 * Author: Ryan Lortie <desrt@desrt.ca>

 */

#include "config.h"

#include "glib-init.h"

#include "glib-private.h"

#include "gtypes.h"

#include "gutils.h"     /* for GDebugKey */

#include "gconstructor.h"

#include "gmem.h"       /* for g_mem_gc_friendly */

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#include <ctype.h>

/* This seems as good a place as any to make static assertions about platform

 * assumptions we make throughout GLib. */

/* We do not support 36-bit bytes or other historical curiosities. */

G_STATIC_ASSERT (CHAR_BIT == 8);

/* We assume that data pointers are the same size as function pointers... */

G_STATIC_ASSERT (sizeof (gpointer) == sizeof (GFunc));

G_STATIC_ASSERT (_g_alignof (gpointer) == _g_alignof (GFunc));

/* ... and that all function pointers are the same size. */

G_STATIC_ASSERT (sizeof (GFunc) == sizeof (GCompareDataFunc));

G_STATIC_ASSERT (_g_alignof (GFunc) == _g_alignof (GCompareDataFunc));

/* We assume that "small" enums (those where all values fit in INT32_MIN

 * to INT32_MAX) are exactly int-sized. In particular, we assume that if

 * an enum has no members that exceed the range of char/short, the

 * compiler will make it int-sized anyway, so adding a member later that

 * *does* exceed the range of char/short is not an ABI break. */

typedef enum {

    TEST_CHAR_0 = 0

} TestChar;

typedef enum {

    TEST_SHORT_0 = 0,

    TEST_SHORT_256 = 256

} TestShort;

typedef enum {

    TEST_INT32_MIN = G_MININT32,

    TEST_INT32_MAX = G_MAXINT32

} TestInt;

G_STATIC_ASSERT (sizeof (TestChar) == sizeof (int));

G_STATIC_ASSERT (sizeof (TestShort) == sizeof (int));

G_STATIC_ASSERT (sizeof (TestInt) == sizeof (int));

G_STATIC_ASSERT (_g_alignof (TestChar) == _g_alignof (int));

G_STATIC_ASSERT (_g_alignof (TestShort) == _g_alignof (int));

G_STATIC_ASSERT (_g_alignof (TestInt) == _g_alignof (int));

/**

 * g_mem_gc_friendly:

 *

 * This variable is %TRUE if the `G_DEBUG` environment variable

 * includes the key `gc-friendly`.

 */

#ifdef ENABLE_GC_FRIENDLY_DEFAULT

gboolean g_mem_gc_friendly = TRUE;

#else

gboolean g_mem_gc_friendly = FALSE;

#endif

GLogLevelFlags g_log_msg_prefix = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_WARNING |

                                  G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_DEBUG;

GLogLevelFlags g_log_always_fatal = G_LOG_FATAL_MASK;

static gboolean

debug_key_matches (const gchar *key,

                   const gchar *token,

                   guint        length)

{

  /* may not call GLib functions: see note in g_parse_debug_string() */

  for (; length; length--, key++, token++)

    {

      char k = (*key   == '_') ? '-' : tolower (*key  );

      char t = (*token == '_') ? '-' : tolower (*token);

      if (k != t)

        return FALSE;

    }

  return *key == '\0';

}

/* The GVariant documentation indirectly says that int is at least 32 bits

 * (by saying that b, y, n, q, i, u, h are promoted to int). On any

 * reasonable platform, int is in fact *exactly* 32 bits long, because

 * otherwise, {signed char, short, int} wouldn't be sufficient to provide

 * {int8_t, int16_t, int32_t}. */

G_STATIC_ASSERT (sizeof (int) == sizeof (gint32));

/**

 * g_parse_debug_string:

 * @string: (nullable): a list of debug options separated by colons, spaces, or

 * commas, or %NULL.

 * @keys: (array length=nkeys): pointer to an array of #GDebugKey which associate

 *     strings with bit flags.

 * @nkeys: the number of #GDebugKeys in the array.

 *

 * Parses a string containing debugging options

 * into a %guint containing bit flags. This is used

 * within GDK and GTK+ to parse the debug options passed on the

 * command line or through environment variables.

 *

 * If @string is equal to "all", all flags are set. Any flags

 * specified along with "all" in @string are inverted; thus,

 * "all,foo,bar" or "foo,bar,all" sets all flags except those

 * corresponding to "foo" and "bar".

 *

 * If @string is equal to "help", all the available keys in @keys

 * are printed out to standard error.

 *

 * Returns: the combined set of bit flags.

 */

guint

g_parse_debug_string  (const gchar     *string,

                       const GDebugKey *keys,

                       guint            nkeys)

{

  guint i;

  guint result = 0;

  if (string == NULL)

    return 0;

  /* this function is used during the initialisation of gmessages, gmem

   * and gslice, so it may not do anything that causes memory to be

   * allocated or risks messages being emitted.

   *

   * this means, more or less, that this code may not call anything

   * inside GLib.

   */

  if (!strcasecmp (string, "help"))

    {

      /* using stdio directly for the reason stated above */

      fprintf (stderr, "Supported debug values:");

      for (i = 0; i < nkeys; i++)

        fprintf (stderr, " %s", keys[i].key);

      fprintf (stderr, " all help\n");

    }

  else

    {

      const gchar *p = string;

      const gchar *q;

      gboolean invert = FALSE;

      while (*p)

       {

         q = strpbrk (p, ":;, \t");

         if (!q)

           q = p + strlen (p);

         if (debug_key_matches ("all", p, q - p))

           {

             invert = TRUE;

           }

         else

           {

             for (i = 0; i < nkeys; i++)

               if (debug_key_matches (keys[i].key, p, q - p))

                 result |= keys[i].value;

           }

         p = q;

         if (*p)

           p++;

       }

      if (invert)

        {

          guint all_flags = 0;

          for (i = 0; i < nkeys; i++)

            all_flags |= keys[i].value;

          result = all_flags & (~result);

        }

    }

  return result;

}

static guint

g_parse_debug_envvar (const gchar     *envvar,

                      const GDebugKey *keys,

                      gint             n_keys,

                      guint            default_value)

{

  const gchar *value;

#ifdef OS_WIN32

  /* "fatal-warnings,fatal-criticals,all,help" is pretty short */

  gchar buffer[100];

  if (GetEnvironmentVariable (envvar, buffer, 100) < 100)

    value = buffer;

  else

    return 0;

#else

  value = getenv (envvar);

#endif

  if (value == NULL)

    return default_value;

  return g_parse_debug_string (value, keys, n_keys);

}

static void

g_messages_prefixed_init (void)

{

  const GDebugKey keys[] = {

    { "error", G_LOG_LEVEL_ERROR },

    { "critical", G_LOG_LEVEL_CRITICAL },

    { "warning", G_LOG_LEVEL_WARNING },

    { "message", G_LOG_LEVEL_MESSAGE },

    { "info", G_LOG_LEVEL_INFO },

    { "debug", G_LOG_LEVEL_DEBUG }

  };

  g_log_msg_prefix = g_parse_debug_envvar ("G_MESSAGES_PREFIXED", keys, G_N_ELEMENTS (keys), g_log_msg_prefix);

}

static void

g_debug_init (void)

{

  const GDebugKey keys[] = {

    { "gc-friendly", 1 },

    {"fatal-warnings",  G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL },

    {"fatal-criticals", G_LOG_LEVEL_CRITICAL }

  };

  GLogLevelFlags flags;

  flags = g_parse_debug_envvar ("G_DEBUG", keys, G_N_ELEMENTS (keys), 0);

  g_log_always_fatal |= flags & G_LOG_LEVEL_MASK;

  g_mem_gc_friendly = flags & 1;

}

void

glib_init (void)

{

  static gboolean glib_inited;

  if (glib_inited)

    return;

  glib_inited = TRUE;

  g_messages_prefixed_init ();

  g_debug_init ();

  g_quark_init ();

}

#if defined (G_OS_WIN32)

HMODULE glib_dll = NULL;

#if defined (DLL_EXPORT)

BOOL WINAPI DllMain (HINSTANCE hinstDLL,

                     DWORD     fdwReason,

                     LPVOID    lpvReserved);

BOOL WINAPI

DllMain (HINSTANCE hinstDLL,

         DWORD     fdwReason,

         LPVOID    lpvReserved)

{

  switch (fdwReason)

    {

    case DLL_PROCESS_ATTACH:

      glib_dll = hinstDLL;

      break;

    case DLL_THREAD_DETACH:

#ifdef THREADS_WIN32

      g_thread_win32_thread_detach ();

#endif

      break;

    case DLL_PROCESS_DETACH:

#ifdef THREADS_WIN32

      if (lpvReserved == NULL)

        g_thread_win32_process_detach ();

#endif

      break;

    default:

      /* do nothing */

      ;

    }

  return TRUE;

}

#endif /* defined (DLL_EXPORT) */

#endif /* defined (G_OS_WIN32) */

#if defined (G_HAS_CONSTRUCTORS)

#ifdef G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA

#pragma G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(glib_init_ctor)

#endif

G_DEFINE_CONSTRUCTOR(glib_init_ctor)

static void

glib_init_ctor (void)

{

#if defined (G_OS_WIN32)

  g_clock_win32_init ();

#ifdef THREADS_WIN32

  g_thread_win32_init ();

#endif /* defined (THREADS_WIN32) */

#endif /* defined (G_OS_WIN32) */

  glib_init ();

}

#else

# error Your platform/compiler is missing constructor support

#endif