gutils.c

嵌入式下基于MiniGUI的Web Browser

/* GLIB - Library of useful routines for C programming
 * Copyright (C) 1995-1998  Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * 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 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GLib Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GLib at ftp://ftp.gtk.org/pub/gtk/. 
 */

/* 
 * MT safe for the unix part, FIXME: make the win32 part MT safe as well.
 */

#ifdef HAVE_CONFIG_H
#include "glibconfig.h"
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

/* implement gutils's inline functions
 */
#define	G_IMPLEMENT_INLINES 1
#define	__G_UTILS_C__
#include "glib.h"

#ifdef	MAXPATHLEN
#define	G_PATH_LENGTH	MAXPATHLEN
#elif	defined (PATH_MAX)
#define	G_PATH_LENGTH	PATH_MAX
#elif   defined (_PC_PATH_MAX)
#define	G_PATH_LENGTH	sysconf(_PC_PATH_MAX)
#else	
#define G_PATH_LENGTH   2048
#endif

#ifdef G_PLATFORM_WIN32
#  define STRICT		/* Strict typing, please */
#  include <windows.h>
#  undef STRICT
#  include <lmcons.h>		/* For UNLEN */
#  include <ctype.h>
#endif /* G_PLATFORM_WIN32 */

#ifdef G_OS_WIN32
#  include <direct.h>
#endif

#ifdef HAVE_CODESET
#include <langinfo.h>
#endif

#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
#include <libintl.h>
#endif

const guint glib_major_version = GLIB_MAJOR_VERSION;
const guint glib_minor_version = GLIB_MINOR_VERSION;
const guint glib_micro_version = GLIB_MICRO_VERSION;
const guint glib_interface_age = GLIB_INTERFACE_AGE;
const guint glib_binary_age = GLIB_BINARY_AGE;

#if !defined (HAVE_MEMMOVE) && !defined (HAVE_WORKING_BCOPY)
void 
g_memmove (gpointer dest, gconstpointer src, gulong len)
{
  gchar* destptr = dest;
  const gchar* srcptr = src;
  if (src + len < dest || dest + len < src)
    {
      bcopy (src, dest, len);
      return;
    }
  else if (dest <= src)
    {
      while (len--)
	*(destptr++) = *(srcptr++);
    }
  else
    {
      destptr += len;
      srcptr += len;
      while (len--)
	*(--destptr) = *(--srcptr);
    }
}
#endif /* !HAVE_MEMMOVE && !HAVE_WORKING_BCOPY */

void
g_atexit (GVoidFunc func)
{
  gint result;
  const gchar *error = NULL;

  /* keep this in sync with glib.h */

#ifdef	G_NATIVE_ATEXIT
  result = ATEXIT (func);
  if (result)
    error = g_strerror (errno);
#elif defined (HAVE_ATEXIT)
#  ifdef NeXT /* @#%@! NeXTStep */
  result = !atexit ((void (*)(void)) func);
  if (result)
    error = g_strerror (errno);
#  else
  result = atexit ((void (*)(void)) func);
  if (result)
    error = g_strerror (errno);
#  endif /* NeXT */
#elif defined (HAVE_ON_EXIT)
  result = on_exit ((void (*)(int, void *)) func, NULL);
  if (result)
    error = g_strerror (errno);
#else
  result = 0;
  error = "no implementation";
#endif /* G_NATIVE_ATEXIT */

  if (error)
    g_error ("Could not register atexit() function: %s", error);
}

/* Based on execvp() from GNU Libc.
 * Some of this code is cut-and-pasted into gspawn.c
 */

static gchar*
my_strchrnul (const gchar *str, gchar c)
{
  gchar *p = (gchar*)str;
  while (*p && (*p != c))
    ++p;

  return p;
}

#ifdef G_OS_WIN32

gchar *inner_find_program_in_path (const gchar *program);

gchar*
g_find_program_in_path (const gchar *program)
{
  const gchar *last_dot = strrchr (program, '.');

  if (last_dot == NULL || strchr (last_dot, '\\') != NULL)
    {
      const gint program_length = strlen (program);
      const gchar *pathext = getenv ("PATHEXT");
      const gchar *p;
      gchar *decorated_program;
      gchar *retval;

      if (pathext == NULL)
	pathext = ".com;.exe;.bat";

      p = pathext;
      do
	{
	  pathext = p;
	  p = my_strchrnul (pathext, ';');

	  decorated_program = g_malloc (program_length + (p-pathext) + 1);
	  memcpy (decorated_program, program, program_length);
	  memcpy (decorated_program+program_length, pathext, p-pathext);
	  decorated_program [program_length + (p-pathext)] = '\0';
	  
	  retval = inner_find_program_in_path (decorated_program);
	  g_free (decorated_program);

	  if (retval != NULL)
	    return retval;
	} while (*p++ != '\0');
      return NULL;
    }
  else
    return inner_find_program_in_path (program);
}

#define g_find_program_in_path inner_find_program_in_path
#endif

/**
 * g_find_program_in_path:
 * @program: a program name
 * 
 * Locates the first executable named @program in the user's path, in the
 * same way that execvp() would locate it. Returns an allocated string
 * with the absolute path name, or NULL if the program is not found in
 * the path. If @program is already an absolute path, returns a copy of
 * @program if @program exists and is executable, and NULL otherwise.
 * 
 * On Windows, if @program does not have a file type suffix, tries to
 * append the suffixes in the PATHEXT environment variable (if that
 * doesn't exists, the suffixes .com, .exe, and .bat) in turn, and
 * then look for the resulting file name in the same way as
 * CreateProcess() would. This means first in the directory where the
 * program was loaded from, then in the current directory, then in the
 * Windows 32-bit system directory, then in the Windows directory, and
 * finally in the directories in the PATH environment variable. If
 * the program is found, the return value contains the full name
 * including the type suffix.
 *
 * Return value: absolute path, or NULL
 **/
gchar*
g_find_program_in_path (const gchar *program)
{
  const gchar *path, *p;
  gchar *name, *freeme;
#ifdef G_OS_WIN32
  gchar *path_tmp;
#endif
  size_t len;
  size_t pathlen;

  g_return_val_if_fail (program != NULL, NULL);

  /* If it is an absolute path, or a relative path including subdirectories,
   * don't look in PATH.
   */
  if (g_path_is_absolute (program)
      || strchr (program, G_DIR_SEPARATOR) != NULL)
    {
      if (g_file_test (program, G_FILE_TEST_IS_EXECUTABLE))
        return g_strdup (program);
      else
        return NULL;
    }
  
  path = g_getenv ("PATH");
#ifdef G_OS_UNIX
  if (path == NULL)
    {
      /* There is no `PATH' in the environment.  The default
       * search path in GNU libc is the current directory followed by
       * the path `confstr' returns for `_CS_PATH'.
       */
      
      /* In GLib we put . last, for security, and don't use the
       * unportable confstr(); UNIX98 does not actually specify
       * what to search if PATH is unset. POSIX may, dunno.
       */
      
      path = "/bin:/usr/bin:.";
    }
#else
  {
    gchar *tmp;
    gchar moddir[MAXPATHLEN], sysdir[MAXPATHLEN], windir[MAXPATHLEN];

    GetModuleFileName (NULL, moddir, sizeof (moddir));
    tmp = g_path_get_dirname (moddir);
    GetSystemDirectory (sysdir, sizeof (sysdir));
    GetWindowsDirectory (windir, sizeof (windir));
    path_tmp = g_strconcat (tmp, ";.;", sysdir, ";", windir,
			    (path != NULL ? ";" : NULL),
			    (path != NULL ? path : NULL),
			    NULL);
    g_free (tmp);
    path = path_tmp;
  }
#endif
  
  len = strlen (program) + 1;
  pathlen = strlen (path);
  freeme = name = g_malloc (pathlen + len + 1);
  
  /* Copy the file name at the top, including '\0'  */
  memcpy (name + pathlen + 1, program, len);
  name = name + pathlen;
  /* And add the slash before the filename  */
  *name = G_DIR_SEPARATOR;
  
  p = path;
  do
    {
      char *startp;

      path = p;
      p = my_strchrnul (path, G_SEARCHPATH_SEPARATOR);

      if (p == path)
        /* Two adjacent colons, or a colon at the beginning or the end
         * of `PATH' means to search the current directory.
         */
        startp = name + 1;
      else
        startp = memcpy (name - (p - path), path, p - path);

      if (g_file_test (startp, G_FILE_TEST_IS_EXECUTABLE))
        {
          gchar *ret;
          ret = g_strdup (startp);
          g_free (freeme);
#ifdef G_OS_WIN32
	  g_free (path_tmp);
#endif
          return ret;
        }
    }
  while (*p++ != '\0');
  
  g_free (freeme);
#ifdef G_OS_WIN32
  g_free (path_tmp);
#endif

  return NULL;
}

gint
g_snprintf (gchar	*str,
	    gulong	 n,
	    gchar const *fmt,
	    ...)
{
  va_list args;
  gint retval;

  va_start (args, fmt);
  retval = g_vsnprintf (str, n, fmt, args);
  va_end (args);
  
  return retval;
}

gint
g_vsnprintf (gchar	 *str,
	     gulong	  n,
	     gchar const *fmt,
	     va_list      args)
{
#ifdef	HAVE_VSNPRINTF_C99
  g_return_val_if_fail (n == 0 || str != NULL, 0);
  g_return_val_if_fail (fmt != NULL, 0);

  return vsnprintf (str, n, fmt, args);
#else	/* !HAVE_VSNPRINTF_C99 */
  gchar *printed;
  gint retval;

  g_return_val_if_fail (n == 0 || str != NULL, 0);
  g_return_val_if_fail (fmt != NULL, 0);

  printed = g_strdup_vprintf (fmt, args);
  retval = strlen (printed);
  if (n > 0)
    {
      strncpy (str, printed, n - 1);
      str[n-1] = '\0';
    }

  g_free (printed);
  
  return retval;
#endif /* !HAVE_VSNPRINTF_C99 */
}

guint	     
g_parse_debug_string  (const gchar     *string, 
		       const GDebugKey *keys, 
		       guint	        nkeys)
{
  guint i;
  guint result = 0;
  
  g_return_val_if_fail (string != NULL, 0);
  
  if (!g_ascii_strcasecmp (string, "all"))
    {
      for (i=0; i<nkeys; i++)
	result |= keys[i].value;
    }
  else
    {
      const gchar *p = string;
      const gchar *q;
      gboolean done = FALSE;
      
      while (*p && !done)
	{
	  q = strchr (p, ':');
	  if (!q)
	    {
	      q = p + strlen(p);
	      done = TRUE;
	    }
	  
	  for (i=0; i<nkeys; i++)
	    if (g_ascii_strncasecmp(keys[i].key, p, q - p) == 0 &&
		keys[i].key[q - p] == '\0')
	      result |= keys[i].value;
	  
	  p = q + 1;
	}
    }
  
  return result;
}

G_CONST_RETURN gchar*
g_basename (const gchar	   *file_name)
{
  register gchar *base;
  
  g_return_val_if_fail (file_name != NULL, NULL);
  
  base = strrchr (file_name, G_DIR_SEPARATOR);
  if (base)
    return base + 1;

#ifdef G_OS_WIN32
  if (g_ascii_isalpha (file_name[0]) && file_name[1] == ':')
    return (gchar*) file_name + 2;
#endif /* G_OS_WIN32 */
  
  return (gchar*) file_name;
}

gchar*
g_path_get_basename (const gchar   *file_name)
{
  register gssize base;             
  register gssize last_nonslash;    
  gsize len;    
  gchar *retval;
 
  g_return_val_if_fail (file_name != NULL, NULL);

  if (file_name[0] == '\0')
    /* empty string */
    return g_strdup (".");
  
  last_nonslash = strlen (file_name) - 1;

  while (last_nonslash >= 0 && file_name [last_nonslash] == G_DIR_SEPARATOR)
    last_nonslash--;

  if (last_nonslash == -1)
    /* string only containing slashes */
    return g_strdup (G_DIR_SEPARATOR_S);

#ifdef G_OS_WIN32
  if (last_nonslash == 1 && g_ascii_isalpha (file_name[0]) && file_name[1] == ':')
    /* string only containing slashes and a drive */
    return g_strdup (G_DIR_SEPARATOR_S);
#endif /* G_OS_WIN32 */

  base = last_nonslash;

  while (base >=0 && file_name [base] != G_DIR_SEPARATOR)
    base--;

#ifdef G_OS_WIN32
  if (base == -1 && g_ascii_isalpha (file_name[0]) && file_name[1] == ':')
    base = 1;
#endif /* G_OS_WIN32 */

  len = last_nonslash - base;
  retval = g_malloc (len + 1);
  memcpy (retval, file_name + base + 1, len);
  retval [len] = '\0';
  return retval;
}

gboolean
g_path_is_absolute (const gchar *file_name)
{
  g_return_val_if_fail (file_name != NULL, FALSE);
  
  if (file_name[0] == G_DIR_SEPARATOR
#ifdef G_OS_WIN32
      || file_name[0] == '/'
#endif
				     )
    return TRUE;

#ifdef G_OS_WIN32
  /* Recognize drive letter on native Windows */
  if (g_ascii_isalpha (file_name[0]) && file_name[1] == ':' && (file_name[2] == G_DIR_SEPARATOR || file_name[2] == '/'))
    return TRUE;
#endif /* G_OS_WIN32 */

  return FALSE;
}

G_CONST_RETURN gchar*
g_path_skip_root (const gchar *file_name)
{
  g_return_val_if_fail (file_name != NULL, NULL);
  
#ifdef G_PLATFORM_WIN32
  /* Skip \\server\share (Win32) or //server/share (Cygwin) */
  if (file_name[0] == G_DIR_SEPARATOR &&
      file_name[1] == G_DIR_SEPARATOR &&
      file_name[2])
    {
      gchar *p;

      if ((p = strchr (file_name + 2, G_DIR_SEPARATOR)) > file_name + 2 &&
	  p[1])
	{
	  file_name = p + 1;

	  while (file_name[0] && file_name[0] != G_DIR_SEPARATOR)
	    file_name++;

	  /* Possibly skip a backslash after the share name */
	  if (file_name[0] == G_DIR_SEPARATOR)
	    file_name++;

	  return (gchar *)file_name;
	}
    }
#endif
  
  /* Skip initial slashes */
  if (file_name[0] == G_DIR_SEPARATOR)
    {
      while (file_name[0] == G_DIR_SEPARATOR)
	file_name++;