2 * winmisc.c: miscellaneous Windows-specific things.
11 void platform_get_x11_auth(char *display, int *proto,
12 unsigned char *data, int *datalen)
14 /* We don't support this at all under Windows. */
17 Filename filename_from_str(const char *str)
20 strncpy(ret.path, str, sizeof(ret.path));
21 ret.path[sizeof(ret.path)-1] = '\0';
25 const char *filename_to_str(const Filename *fn)
30 int filename_equal(Filename f1, Filename f2)
32 return !strcmp(f1.path, f2.path);
35 int filename_is_null(Filename fn)
40 int SaneDialogBox(HINSTANCE hinst,
52 wc.style = CS_DBLCLKS | CS_SAVEBITS | CS_BYTEALIGNWINDOW;
53 wc.lpfnWndProc = DefDlgProc;
55 wc.cbWndExtra = DLGWINDOWEXTRA + 8;
58 wc.hCursor = LoadCursor(NULL, IDC_ARROW);
59 wc.hbrBackground = (HBRUSH) (COLOR_BACKGROUND +1);
60 wc.lpszMenuName = NULL;
61 wc.lpszClassName = "PuTTYConfigBox";
64 hwnd = CreateDialog(hinst, tmpl, hwndparent, lpDialogFunc);
66 SetWindowLong(hwnd, BOXFLAGS, 0); /* flags */
67 SetWindowLong(hwnd, BOXRESULT, 0); /* result from SaneEndDialog */
69 while ((gm=GetMessage(&msg, NULL, 0, 0)) > 0) {
70 flags=GetWindowLong(hwnd, BOXFLAGS);
71 if (!(flags & DF_END) && !IsDialogMessage(hwnd, &msg))
72 DispatchMessage(&msg);
78 PostQuitMessage(msg.wParam); /* We got a WM_QUIT, pass it on */
80 ret=GetWindowLong(hwnd, BOXRESULT);
85 void SaneEndDialog(HWND hwnd, int ret)
87 SetWindowLong(hwnd, BOXRESULT, ret);
88 SetWindowLong(hwnd, BOXFLAGS, DF_END);
92 static FILE *debug_fp = NULL;
93 static HANDLE debug_hdl = INVALID_HANDLE_VALUE;
94 static int debug_got_console = 0;
100 if (!debug_got_console) {
101 if (AllocConsole()) {
102 debug_got_console = 1;
103 debug_hdl = GetStdHandle(STD_OUTPUT_HANDLE);
107 debug_fp = fopen("debug.log", "w");
110 if (debug_hdl != INVALID_HANDLE_VALUE) {
111 WriteFile(debug_hdl, buf, strlen(buf), &dw, NULL);
113 fputs(buf, debug_fp);
120 * Minefield - a Windows equivalent for Electric Fence
123 #define PAGESIZE 4096
128 * We start by reserving as much virtual address space as Windows
129 * will sensibly (or not sensibly) let us have. We flag it all as
132 * Any allocation attempt is satisfied by committing one or more
133 * pages, with an uncommitted page on either side. The returned
134 * memory region is jammed up against the _end_ of the pages.
136 * Freeing anything causes instantaneous decommitment of the pages
137 * involved, so stale pointers are caught as soon as possible.
140 static int minefield_initialised = 0;
141 static void *minefield_region = NULL;
142 static long minefield_size = 0;
143 static long minefield_npages = 0;
144 static long minefield_curpos = 0;
145 static unsigned short *minefield_admin = NULL;
146 static void *minefield_pages = NULL;
148 static void minefield_admin_hide(int hide)
150 int access = hide ? PAGE_NOACCESS : PAGE_READWRITE;
151 VirtualProtect(minefield_admin, minefield_npages * 2, access, NULL);
154 static void minefield_init(void)
160 for (size = 0x40000000; size > 0; size = ((size >> 3) * 7) & ~0xFFF) {
161 minefield_region = VirtualAlloc(NULL, size,
162 MEM_RESERVE, PAGE_NOACCESS);
163 if (minefield_region)
166 minefield_size = size;
169 * Firstly, allocate a section of that to be the admin block.
170 * We'll need a two-byte field for each page.
172 minefield_admin = minefield_region;
173 minefield_npages = minefield_size / PAGESIZE;
174 admin_size = (minefield_npages * 2 + PAGESIZE - 1) & ~(PAGESIZE - 1);
175 minefield_npages = (minefield_size - admin_size) / PAGESIZE;
176 minefield_pages = (char *) minefield_region + admin_size;
179 * Commit the admin region.
181 VirtualAlloc(minefield_admin, minefield_npages * 2,
182 MEM_COMMIT, PAGE_READWRITE);
185 * Mark all pages as unused (0xFFFF).
187 for (i = 0; i < minefield_npages; i++)
188 minefield_admin[i] = 0xFFFF;
191 * Hide the admin region.
193 minefield_admin_hide(1);
195 minefield_initialised = 1;
198 static void minefield_bomb(void)
200 div(1, *(int *) minefield_pages);
203 static void *minefield_alloc(int size)
206 int pos, lim, region_end, region_start;
210 npages = (size + PAGESIZE - 1) / PAGESIZE;
212 minefield_admin_hide(0);
215 * Search from current position until we find a contiguous
216 * bunch of npages+2 unused pages.
218 pos = minefield_curpos;
219 lim = minefield_npages;
221 /* Skip over used pages. */
222 while (pos < lim && minefield_admin[pos] != 0xFFFF)
224 /* Count unused pages. */
226 while (pos < lim && pos - start < npages + 2 &&
227 minefield_admin[pos] == 0xFFFF)
229 if (pos - start == npages + 2)
231 /* If we've reached the limit, reset the limit or stop. */
233 if (lim == minefield_npages) {
234 /* go round and start again at zero */
235 lim = minefield_curpos;
238 minefield_admin_hide(1);
244 minefield_curpos = pos - 1;
247 * We have npages+2 unused pages starting at start. We leave
248 * the first and last of these alone and use the rest.
250 region_end = (start + npages + 1) * PAGESIZE;
251 region_start = region_end - size;
252 /* FIXME: could align here if we wanted */
255 * Update the admin region.
257 for (i = start + 2; i < start + npages + 1; i++)
258 minefield_admin[i] = 0xFFFE; /* used but no region starts here */
259 minefield_admin[start + 1] = region_start % PAGESIZE;
261 minefield_admin_hide(1);
263 VirtualAlloc((char *) minefield_pages + region_start, size,
264 MEM_COMMIT, PAGE_READWRITE);
265 return (char *) minefield_pages + region_start;
268 static void minefield_free(void *ptr)
270 int region_start, i, j;
272 minefield_admin_hide(0);
274 region_start = (char *) ptr - (char *) minefield_pages;
275 i = region_start / PAGESIZE;
276 if (i < 0 || i >= minefield_npages ||
277 minefield_admin[i] != region_start % PAGESIZE)
279 for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++) {
280 minefield_admin[j] = 0xFFFF;
283 VirtualFree(ptr, j * PAGESIZE - region_start, MEM_DECOMMIT);
285 minefield_admin_hide(1);
288 static int minefield_get_size(void *ptr)
290 int region_start, i, j;
292 minefield_admin_hide(0);
294 region_start = (char *) ptr - (char *) minefield_pages;
295 i = region_start / PAGESIZE;
296 if (i < 0 || i >= minefield_npages ||
297 minefield_admin[i] != region_start % PAGESIZE)
299 for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++);
301 minefield_admin_hide(1);
303 return j * PAGESIZE - region_start;
306 void *minefield_c_malloc(size_t size)
308 if (!minefield_initialised)
310 return minefield_alloc(size);
313 void minefield_c_free(void *p)
315 if (!minefield_initialised)
321 * realloc _always_ moves the chunk, for rapid detection of code
322 * that assumes it won't.
324 void *minefield_c_realloc(void *p, size_t size)
328 if (!minefield_initialised)
330 q = minefield_alloc(size);
331 oldsize = minefield_get_size(p);
332 memcpy(q, p, (oldsize < size ? oldsize : size));
337 #endif /* MINEFIELD */