IABSD.fr/xenocara/app/xdm/file.c

Branch : - branch - master - tag -

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  Commit

• Author : matthieu
  Date : 2010-03-28 09:33:02
  Hash : 21c33a1b
  Message : Update to xdm 1.1.9

• app/xdm/file.c

• /*
  
  Copyright 1988, 1998  The Open Group
  
  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.
  
  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  OTHER DEALINGS IN THE SOFTWARE.
  
  Except as contained in this notice, the name of The Open Group shall
  not be used in advertising or otherwise to promote the sale, use or
  other dealings in this Software without prior written authorization
  from The Open Group.
  
  */
  
  /*
   * xdm - display manager daemon
   * Author:  Keith Packard, MIT X Consortium
   *
   * file.c
   */
  
  #include	"dm.h"
  #include	"dm_error.h"
  
  #include	<ctype.h>
  
  static int
  DisplayTypeMatch (DisplayType d1, DisplayType d2)
  {
  	return d1.location == d2.location &&
  	       d1.lifetime == d2.lifetime &&
  	       d1.origin == d2.origin;
  }
  
  static void
  freeFileArgs (char **args)
  {
      char    **a;
  
      for (a = args; *a; a++)
  	free (*a);
      free ((char *) args);
  }
  
  static char **
  splitIntoWords (char *s)
  {
      char    **args, **newargs;
      char    *wordStart;
      int	    nargs;
  
      args = NULL;
      nargs = 0;
      while (*s)
      {
  	while (*s && isspace (*s))
  	    ++s;
  	if (!*s || *s == '#')
  	    break;
  	wordStart = s;
  	while (*s && *s != '#' && !isspace (*s))
  	    ++s;
  	if (!args)
  	{
      	    args = (char **) malloc (2 * sizeof (char *));
      	    if (!args)
  	    	return NULL;
  	}
  	else
  	{
  	    newargs = (char **) realloc ((char *) args,
  					 (nargs+2)*sizeof (char *));
  	    if (!newargs)
  	    {
  	    	freeFileArgs (args);
  	    	return NULL;
  	    }
  	    args = newargs;
  	}
  	args[nargs] = malloc (s - wordStart + 1);
  	if (!args[nargs])
  	{
  	    freeFileArgs (args);
  	    return NULL;
  	}
  	strncpy (args[nargs], wordStart, s - wordStart);
  	args[nargs][s-wordStart] = '\0';
  	++nargs;
  	args[nargs] = NULL;
      }
      return args;
  }
  
  static char **
  copyArgs (char **args)
  {
      char    **a, **new, **n;
  
      for (a = args; *a; a++)
  	/* SUPPRESS 530 */
  	;
      new = (char **) malloc ((a - args + 1) * sizeof (char *));
      if (!new)
  	return NULL;
      n = new;
      a = args;
      /* SUPPRESS 560 */
      while ((*n++ = *a++))
  	/* SUPPRESS 530 */
  	;
      return new;
  }
  
  static void
  freeSomeArgs (char **args, int n)
  {
      char    **a;
  
      a = args;
      while (n--)
  	free (*a++);
      free ((char *) args);
  }
  
  void
  ParseDisplay (char *source, DisplayType *acceptableTypes, int numAcceptable)
  {
      char		**args, **argv, **a;
      char		*name, *class, *type;
      struct display	*d;
      int			usedDefault;
      DisplayType		displayType;
  
      args = splitIntoWords (source);
      if (!args)
  	return;
      if (!args[0])
      {
  	LogError ("Missing display name in servers file\n");
  	freeFileArgs (args);
  	return;
      }
      name = args[0];
      if (!args[1])
      {
  	LogError ("Missing display type for %s\n", args[0]);
  	freeFileArgs (args);
  	return;
      }
      displayType = parseDisplayType (args[1], &usedDefault);
      class = NULL;
      type = args[1];
      argv = args + 2;
      /*
       * extended syntax; if the second argument doesn't
       * exactly match a legal display type and the third
       * argument does, use the second argument as the
       * display class string
       */
      if (usedDefault && args[2])
      {
  	displayType = parseDisplayType (args[2], &usedDefault);
  	if (!usedDefault)
  	{
  	    class = args[1];
  	    type = args[2];
  	    argv = args + 3;
  	}
      }
      while (numAcceptable)
      {
  	if (DisplayTypeMatch (*acceptableTypes, displayType))
  	    break;
  	--numAcceptable;
  	++acceptableTypes;
      }
      if (!numAcceptable)
      {
  	LogError ("Unacceptable display type %s for display %s\n",
  		  type, name);
      }
      d = FindDisplayByName (name);
      if (d)
      {
  	d->state = OldEntry;
  	if (class && strcmp (d->class, class))
  	{
  	    char    *newclass;
  
  	    newclass = strdup (class);
  	    if (newclass)
  	    {
  		free (d->class);
  		d->class = newclass;
  	    }
  	}
  	Debug ("Found existing display:  %s %s %s", d->name, d->class , type);
  	freeFileArgs (d->argv);
      }
      else
      {
  	d = NewDisplay (name, class);
  	Debug ("Found new display:  %s %s %s",
  		d->name, d->class ? d->class : "", type);
      }
      d->displayType = displayType;
      d->argv = copyArgs (argv);
      for (a = d->argv; a && *a; a++)
  	Debug (" %s", *a);
      Debug ("\n");
      freeSomeArgs (args, argv - args);
  }
  
  static struct displayMatch {
  	char		*name;
  	DisplayType	type;
  } displayTypes[] = {
  	{ "local",		{ Local, Permanent, FromFile } },
  	{ "foreign",		{ Foreign, Permanent, FromFile } },
  	{ NULL,			{ Local, Permanent, FromFile } },
  };
  
  DisplayType
  parseDisplayType (char *string, int *usedDefault)
  {
  	struct displayMatch	*d;
  
  	for (d = displayTypes; d->name; d++)
  		if (!strcmp (d->name, string))
  		{
  			*usedDefault = 0;
  			return d->type;
  		}
  	*usedDefault = 1;
  	return d->type;
  }