1
2/*
3 *
4 * Code and supporting documentation (c) Copyright 1990 1991 Tektronix, Inc.
5 * 	All Rights Reserved
6 *
7 * This file is a component of an X Window System-specific implementation
8 * of Xcms based on the TekColor Color Management System.  Permission is
9 * hereby granted to use, copy, modify, sell, and otherwise distribute this
10 * software and its documentation for any purpose and without fee, provided
11 * that this copyright, permission, and disclaimer notice is reproduced in
12 * all copies of this software and in supporting documentation.  TekColor
13 * is a trademark of Tektronix, Inc.
14 *
15 * Tektronix makes no representation about the suitability of this software
16 * for any purpose.  It is provided "as is" and with all faults.
17 *
18 * TEKTRONIX DISCLAIMS ALL WARRANTIES APPLICABLE TO THIS SOFTWARE,
19 * INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
20 * PARTICULAR PURPOSE.  IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR ANY
21 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
22 * RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF
23 * CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
24 * CONNECTION WITH THE USE OR THE PERFORMANCE OF THIS SOFTWARE.
25 *
26 *	NAME
27 *		XcmsProp.c
28 *
29 *	DESCRIPTION
30 *		This utility routines for manipulating properties.
31 *
32 */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36#endif
37#include <X11/Xatom.h>
38#include "Xlibint.h"
39#include "Xcmsint.h"
40#include "Cv.h"
41
42
43/************************************************************************
44 *									*
45 *			API PRIVATE ROUTINES				*
46 *									*
47 ************************************************************************/
48
49
50/*
51 *	NAME
52 *		_XcmsGetElement -- get an element value from the property passed
53 *
54 *	SYNOPSIS
55 */
56unsigned long
57_XcmsGetElement(
58    int             format,
59    char            **pValue,
60    unsigned long   *pCount)
61/*
62 *	DESCRIPTION
63 *	    Get the next element from the property and return it.
64 *	    Also increment the pointer the amount needed.
65 *
66 *	Returns
67 *	    unsigned long
68 */
69{
70    unsigned long value;
71
72    switch (format) {
73      case 32:
74	value = *((unsigned long *)(*pValue)) & 0xFFFFFFFF;
75	*pValue += sizeof(unsigned long);
76	*pCount -= 1;
77	break;
78      case 16:
79	value = *((unsigned short *)(*pValue));
80	*pValue += sizeof(unsigned short);
81	*pCount -= 1;
82	break;
83      case 8:
84	value = *((unsigned char *) (*pValue));
85	*pValue += 1;
86	*pCount -= 1;
87	break;
88      default:
89	value = 0;
90	break;
91    }
92    return(value);
93}
94
95
96/*
97 *	NAME
98 *		_XcmsGetProperty -- Determine the existence of a property
99 *
100 *	SYNOPSIS
101 */
102int
103_XcmsGetProperty(
104    Display *pDpy,
105    Window  w,
106    Atom property,
107    int             *pFormat,
108    unsigned long   *pNItems,
109    unsigned long   *pNBytes,
110    char            **pValue)
111/*
112 *	DESCRIPTION
113 *
114 *	Returns
115 *	    0 if property does not exist.
116 *	    1 if property exists.
117 */
118{
119    char *prop_ret;
120    int format_ret;
121    long len = 6516;
122    unsigned long nitems_ret, after_ret;
123    Atom atom_ret;
124    int xgwp_ret;
125
126    while (True) {
127	xgwp_ret = XGetWindowProperty (pDpy, w, property, 0, len, False,
128				       XA_INTEGER, &atom_ret, &format_ret,
129				       &nitems_ret, &after_ret,
130				       (unsigned char **)&prop_ret);
131	if (xgwp_ret == Success && after_ret > 0) {
132	    len += nitems_ret * (format_ret >> 3);
133	    XFree (prop_ret);
134	} else {
135	    break;
136	}
137    }
138    if (xgwp_ret != Success || format_ret == 0 || nitems_ret == 0) {
139	/* the property does not exist or is of an unexpected type or
140           getting window property failed */
141	XFree (prop_ret);
142	return(XcmsFailure);
143    }
144
145    *pFormat = format_ret;
146    *pNItems = nitems_ret;
147    *pNBytes = nitems_ret * (format_ret >> 3);
148    *pValue = prop_ret;
149    return(XcmsSuccess);
150}
151