IABSD.fr/xenocara/lib/libX11/src/XlibAsync.c

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• Author : matthieu
  Date : 2010-05-18 19:37:28
  Hash : aa3c9f93
  Message : Update to libX11 1.3.3. Tested on a bulk ports build by naddy@.

• lib/libX11/src/XlibAsync.c

• /*
  
  Copyright 1992, 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.
  
  */
  
  #define NEED_REPLIES
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include <X11/Xlibint.h>
  #include <X11/Xos.h>
  
  /*ARGSUSED*/
  Bool
  _XAsyncErrorHandler(
      register Display *dpy,
      register xReply *rep,
      char *buf,
      int len,
      XPointer data)
  {
      register _XAsyncErrorState *state;
  
      state = (_XAsyncErrorState *)data;
      if (rep->generic.type == X_Error &&
  	(!state->error_code ||
  	 rep->error.errorCode == state->error_code) &&
  	(!state->major_opcode ||
  	 rep->error.majorCode == state->major_opcode) &&
  	(!state->minor_opcode ||
  	 rep->error.minorCode == state->minor_opcode) &&
  	(!state->min_sequence_number ||
  	 (state->min_sequence_number <= dpy->last_request_read)) &&
  	(!state->max_sequence_number ||
  	 (state->max_sequence_number >= dpy->last_request_read))) {
  	state->last_error_received = rep->error.errorCode;
  	state->error_count++;
  	return True;
      }
      return False;
  }
  
  void _XDeqAsyncHandler(
      Display *dpy,
      register _XAsyncHandler *handler)
  {
      register _XAsyncHandler **prev;
      register _XAsyncHandler *async;
  
      for (prev = &dpy->async_handlers;
  	 (async = *prev) && (async != handler);
  	 prev = &async->next)
  	;
      if (async)
  	*prev = async->next;
  }
  
  char *
  _XGetAsyncReply(
      register Display *dpy,
      register char *replbuf,	/* data is read into this buffer */
      register xReply *rep,	/* value passed to calling handler */
      char *buf,			/* value passed to calling handler */
      int len,			/* value passed to calling handler */
      int extra,			/* extra words to read, ala _XReply */
      Bool discard)		/* discard after extra?, ala _XReply */
  {
      if (extra == 0) {
  	if (discard && (rep->generic.length << 2) > len)
  	    _XEatData (dpy, (rep->generic.length << 2) - len);
  	return (char *)rep;
      }
  
      if (extra <= rep->generic.length) {
  	int size = SIZEOF(xReply) + (extra << 2);
  	if (size > len) {
  	    memcpy(replbuf, buf, len);
  	    _XRead(dpy, replbuf + len, size - len);
  	    buf = replbuf;
  	    len = size;
  #ifdef MUSTCOPY
  	} else {
  	    memcpy(replbuf, buf, size);
  	    buf = replbuf;
  #endif
  	}
  
  	if (discard && rep->generic.length > extra &&
  	    (rep->generic.length << 2) > len)
  	    _XEatData (dpy, (rep->generic.length << 2) - len);
  
  	return buf;
      }
      /*
       *if we get here, then extra > rep->generic.length--meaning we
       * read a reply that's shorter than we expected.  This is an
       * error,  but we still need to figure out how to handle it...
       */
      if ((rep->generic.length << 2) > len)
  	_XEatData (dpy, (rep->generic.length << 2) - len);
      _XIOError (dpy);
      return (char *)rep;
  }
  
  void
  _XGetAsyncData(
      Display *dpy,
      char *data,			/* data is read into this buffer */
      char *buf,			/* value passed to calling handler */
      int len,			/* value passed to calling handler */
      int skip,			/* number of bytes already read in previous
  				   _XGetAsyncReply or _XGetAsyncData calls */
      int datalen,		/* size of data buffer in bytes */
      int discardtotal)		/* min. bytes to consume (after skip) */
  {
      buf += skip;
      len -= skip;
      if (!data) {
  	if (datalen > len)
  	    _XEatData(dpy, datalen - len);
      } else if (datalen <= len) {
  	memcpy(data, buf, datalen);
      } else {
  	memcpy(data, buf, len);
  	_XRead(dpy, data + len, datalen - len);
      }
      if (discardtotal > len) {
  	if (datalen > len)
  	    len = datalen;
  	_XEatData(dpy, discardtotal - len);
      }
  }