lib_screen.c revision 76726 
1/****************************************************************************
2 * Copyright (c) 1998,2000 Free Software Foundation, Inc.                   *
3 *                                                                          *
4 * Permission is hereby granted, free of charge, to any person obtaining a  *
5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
7 * without limitation the rights to use, copy, modify, merge, publish,      *
8 * distribute, distribute with modifications, sublicense, and/or sell       *
9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
25 * sale, use or other dealings in this Software without prior written       *
26 * authorization.                                                           *
27 ****************************************************************************/
28
29/****************************************************************************
30 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32 ****************************************************************************/
33
34#include <curses.priv.h>
35
36#include <sys/stat.h>
37#include <time.h>
38#include <term.h>		/* exit_ca_mode, non_rev_rmcup */
39
40MODULE_ID("$Id: lib_screen.c,v 1.17 2000/12/10 02:43:27 tom Exp $")
41
42static time_t dumptime;
43
44NCURSES_EXPORT(WINDOW *)
45getwin(FILE * filep)
46{
47    WINDOW tmp, *nwin;
48    int n;
49
50    T((T_CALLED("getwin(%p)"), filep));
51
52    (void) fread(&tmp, sizeof(WINDOW), 1, filep);
53    if (ferror(filep))
54	returnWin(0);
55
56    if ((nwin = newwin(tmp._maxy + 1, tmp._maxx + 1, 0, 0)) == 0)
57	returnWin(0);
58
59    /*
60     * We deliberately do not restore the _parx, _pary, or _parent
61     * fields, because the window hierarchy within which they
62     * made sense is probably gone.
63     */
64    nwin->_curx = tmp._curx;
65    nwin->_cury = tmp._cury;
66    nwin->_maxy = tmp._maxy;
67    nwin->_maxx = tmp._maxx;
68    nwin->_begy = tmp._begy;
69    nwin->_begx = tmp._begx;
70    nwin->_yoffset = tmp._yoffset;
71    nwin->_flags = tmp._flags & ~(_SUBWIN | _ISPAD);
72
73    nwin->_attrs = tmp._attrs;
74    nwin->_bkgd = tmp._bkgd;
75
76    nwin->_clear = tmp._clear;
77    nwin->_scroll = tmp._scroll;
78    nwin->_leaveok = tmp._leaveok;
79    nwin->_use_keypad = tmp._use_keypad;
80    nwin->_delay = tmp._delay;
81    nwin->_immed = tmp._immed;
82    nwin->_sync = tmp._sync;
83
84    nwin->_regtop = tmp._regtop;
85    nwin->_regbottom = tmp._regbottom;
86
87    for (n = 0; n < nwin->_maxy + 1; n++) {
88	(void) fread(nwin->_line[n].text,
89		     sizeof(chtype), (size_t) (nwin->_maxx + 1), filep);
90	if (ferror(filep)) {
91	    delwin(nwin);
92	    returnWin(0);
93	}
94    }
95    touchwin(nwin);
96
97    returnWin(nwin);
98}
99
100NCURSES_EXPORT(int)
101putwin(WINDOW *win, FILE * filep)
102{
103    int code = ERR;
104    int n;
105
106    T((T_CALLED("putwin(%p,%p)"), win, filep));
107
108    if (win) {
109	(void) fwrite(win, sizeof(WINDOW), 1, filep);
110	if (ferror(filep))
111	    returnCode(code);
112
113	for (n = 0; n < win->_maxy + 1; n++) {
114	    (void) fwrite(win->_line[n].text,
115			  sizeof(chtype), (size_t) (win->_maxx + 1), filep);
116	    if (ferror(filep))
117		returnCode(code);
118	}
119	code = OK;
120    }
121    returnCode(code);
122}
123
124NCURSES_EXPORT(int)
125scr_restore(const char *file)
126{
127    FILE *fp = 0;
128
129    T((T_CALLED("scr_restore(%s)"), _nc_visbuf(file)));
130
131    if (_nc_access(file, R_OK) < 0
132	|| (fp = fopen(file, "rb")) == 0)
133	returnCode(ERR);
134    else {
135	delwin(newscr);
136	newscr = getwin(fp);
137	(void) fclose(fp);
138	returnCode(OK);
139    }
140}
141
142NCURSES_EXPORT(int)
143scr_dump(const char *file)
144{
145    FILE *fp = 0;
146
147    T((T_CALLED("scr_dump(%s)"), _nc_visbuf(file)));
148
149    if (_nc_access(file, W_OK) < 0
150	|| (fp = fopen(file, "wb")) == 0)
151	returnCode(ERR);
152    else {
153	(void) putwin(newscr, fp);
154	(void) fclose(fp);
155	dumptime = time((time_t *) 0);
156	returnCode(OK);
157    }
158}
159
160NCURSES_EXPORT(int)
161scr_init(const char *file)
162{
163    FILE *fp = 0;
164    struct stat stb;
165
166    T((T_CALLED("scr_init(%s)"), _nc_visbuf(file)));
167
168    if (exit_ca_mode && non_rev_rmcup)
169	returnCode(ERR);
170
171    if (_nc_access(file, R_OK) < 0
172	|| (fp = fopen(file, "rb")) == 0)
173	returnCode(ERR);
174    else if (fstat(STDOUT_FILENO, &stb) || stb.st_mtime > dumptime)
175	returnCode(ERR);
176    else {
177	delwin(curscr);
178	curscr = getwin(fp);
179	(void) fclose(fp);
180	returnCode(OK);
181    }
182}
183
184NCURSES_EXPORT(int)
185scr_set(const char *file)
186{
187    T((T_CALLED("scr_set(%s)"), _nc_visbuf(file)));
188
189    if (scr_init(file) == ERR)
190	returnCode(ERR);
191    else {
192	delwin(newscr);
193	newscr = dupwin(curscr);
194	returnCode(OK);
195    }
196}
197