2 * winmisc.c: miscellaneous Windows-specific things
10 OSVERSIONINFO osVersion
;
12 char *platform_get_x_display(void) {
13 /* We may as well check for DISPLAY in case it's useful. */
14 return dupstr(getenv("DISPLAY"));
17 Filename
*filename_from_str(const char *str
)
19 Filename
*ret
= snew(Filename
);
20 ret
->path
= dupstr(str
);
24 Filename
*filename_copy(const Filename
*fn
)
26 return filename_from_str(fn
->path
);
29 const char *filename_to_str(const Filename
*fn
)
34 int filename_equal(const Filename
*f1
, const Filename
*f2
)
36 return !strcmp(f1
->path
, f2
->path
);
39 int filename_is_null(const Filename
*fn
)
44 void filename_free(Filename
*fn
)
50 int filename_serialise(const Filename
*f
, void *vdata
)
52 char *data
= (char *)vdata
;
53 int len
= strlen(f
->path
) + 1; /* include trailing NUL */
55 strcpy(data
, f
->path
);
59 Filename
*filename_deserialise(void *vdata
, int maxsize
, int *used
)
61 char *data
= (char *)vdata
;
63 end
= memchr(data
, '\0', maxsize
);
68 return filename_from_str(data
);
71 char *get_username(void)
75 int got_username
= FALSE
;
76 DECL_WINDOWS_FUNCTION(static, BOOLEAN
, GetUserNameExA
,
77 (EXTENDED_NAME_FORMAT
, LPSTR
, PULONG
));
80 static int tried_usernameex
= FALSE
;
81 if (!tried_usernameex
) {
82 /* Not available on Win9x, so load dynamically */
83 HMODULE secur32
= load_system32_dll("secur32.dll");
84 GET_WINDOWS_FUNCTION(secur32
, GetUserNameExA
);
85 tried_usernameex
= TRUE
;
89 if (p_GetUserNameExA
) {
91 * If available, use the principal -- this avoids the problem
92 * that the local username is case-insensitive but Kerberos
93 * usernames are case-sensitive.
98 (void) p_GetUserNameExA(NameUserPrincipal
, NULL
, &namelen
);
100 user
= snewn(namelen
, char);
101 got_username
= p_GetUserNameExA(NameUserPrincipal
, user
, &namelen
);
103 char *p
= strchr(user
, '@');
111 /* Fall back to local user name */
113 if (GetUserName(NULL
, &namelen
) == FALSE
) {
115 * Apparently this doesn't work at least on Windows XP SP2.
116 * Thus assume a maximum of 256. It will fail again if it
122 user
= snewn(namelen
, char);
123 got_username
= GetUserName(user
, &namelen
);
129 return got_username ? user
: NULL
;
132 BOOL
init_winver(void)
134 ZeroMemory(&osVersion
, sizeof(osVersion
));
135 osVersion
.dwOSVersionInfoSize
= sizeof (OSVERSIONINFO
);
136 return GetVersionEx ( (OSVERSIONINFO
*) &osVersion
);
139 HMODULE
load_system32_dll(const char *libname
)
142 * Wrapper function to load a DLL out of c:\windows\system32
143 * without going through the full DLL search path. (Hence no
144 * attack is possible by placing a substitute DLL earlier on that
147 static char *sysdir
= NULL
;
154 size
= 3*size
/2 + 512;
155 sysdir
= sresize(sysdir
, size
, char);
156 len
= GetSystemDirectory(sysdir
, size
);
157 } while (len
>= size
);
160 fullpath
= dupcat(sysdir
, "\\", libname
, NULL
);
161 ret
= LoadLibrary(fullpath
);
167 static FILE *debug_fp
= NULL
;
168 static HANDLE debug_hdl
= INVALID_HANDLE_VALUE
;
169 static int debug_got_console
= 0;
171 void dputs(char *buf
)
175 if (!debug_got_console
) {
176 if (AllocConsole()) {
177 debug_got_console
= 1;
178 debug_hdl
= GetStdHandle(STD_OUTPUT_HANDLE
);
182 debug_fp
= fopen("debug.log", "w");
185 if (debug_hdl
!= INVALID_HANDLE_VALUE
) {
186 WriteFile(debug_hdl
, buf
, strlen(buf
), &dw
, NULL
);
188 fputs(buf
, debug_fp
);
195 * Minefield - a Windows equivalent for Electric Fence
198 #define PAGESIZE 4096
203 * We start by reserving as much virtual address space as Windows
204 * will sensibly (or not sensibly) let us have. We flag it all as
207 * Any allocation attempt is satisfied by committing one or more
208 * pages, with an uncommitted page on either side. The returned
209 * memory region is jammed up against the _end_ of the pages.
211 * Freeing anything causes instantaneous decommitment of the pages
212 * involved, so stale pointers are caught as soon as possible.
215 static int minefield_initialised
= 0;
216 static void *minefield_region
= NULL
;
217 static long minefield_size
= 0;
218 static long minefield_npages
= 0;
219 static long minefield_curpos
= 0;
220 static unsigned short *minefield_admin
= NULL
;
221 static void *minefield_pages
= NULL
;
223 static void minefield_admin_hide(int hide
)
225 int access
= hide ? PAGE_NOACCESS
: PAGE_READWRITE
;
226 VirtualProtect(minefield_admin
, minefield_npages
* 2, access
, NULL
);
229 static void minefield_init(void)
235 for (size
= 0x40000000; size
> 0; size
= ((size
>> 3) * 7) & ~0xFFF) {
236 minefield_region
= VirtualAlloc(NULL
, size
,
237 MEM_RESERVE
, PAGE_NOACCESS
);
238 if (minefield_region
)
241 minefield_size
= size
;
244 * Firstly, allocate a section of that to be the admin block.
245 * We'll need a two-byte field for each page.
247 minefield_admin
= minefield_region
;
248 minefield_npages
= minefield_size
/ PAGESIZE
;
249 admin_size
= (minefield_npages
* 2 + PAGESIZE
- 1) & ~(PAGESIZE
- 1);
250 minefield_npages
= (minefield_size
- admin_size
) / PAGESIZE
;
251 minefield_pages
= (char *) minefield_region
+ admin_size
;
254 * Commit the admin region.
256 VirtualAlloc(minefield_admin
, minefield_npages
* 2,
257 MEM_COMMIT
, PAGE_READWRITE
);
260 * Mark all pages as unused (0xFFFF).
262 for (i
= 0; i
< minefield_npages
; i
++)
263 minefield_admin
[i
] = 0xFFFF;
266 * Hide the admin region.
268 minefield_admin_hide(1);
270 minefield_initialised
= 1;
273 static void minefield_bomb(void)
275 div(1, *(int *) minefield_pages
);
278 static void *minefield_alloc(int size
)
281 int pos
, lim
, region_end
, region_start
;
285 npages
= (size
+ PAGESIZE
- 1) / PAGESIZE
;
287 minefield_admin_hide(0);
290 * Search from current position until we find a contiguous
291 * bunch of npages+2 unused pages.
293 pos
= minefield_curpos
;
294 lim
= minefield_npages
;
296 /* Skip over used pages. */
297 while (pos
< lim
&& minefield_admin
[pos
] != 0xFFFF)
299 /* Count unused pages. */
301 while (pos
< lim
&& pos
- start
< npages
+ 2 &&
302 minefield_admin
[pos
] == 0xFFFF)
304 if (pos
- start
== npages
+ 2)
306 /* If we've reached the limit, reset the limit or stop. */
308 if (lim
== minefield_npages
) {
309 /* go round and start again at zero */
310 lim
= minefield_curpos
;
313 minefield_admin_hide(1);
319 minefield_curpos
= pos
- 1;
322 * We have npages+2 unused pages starting at start. We leave
323 * the first and last of these alone and use the rest.
325 region_end
= (start
+ npages
+ 1) * PAGESIZE
;
326 region_start
= region_end
- size
;
327 /* FIXME: could align here if we wanted */
330 * Update the admin region.
332 for (i
= start
+ 2; i
< start
+ npages
+ 1; i
++)
333 minefield_admin
[i
] = 0xFFFE; /* used but no region starts here */
334 minefield_admin
[start
+ 1] = region_start
% PAGESIZE
;
336 minefield_admin_hide(1);
338 VirtualAlloc((char *) minefield_pages
+ region_start
, size
,
339 MEM_COMMIT
, PAGE_READWRITE
);
340 return (char *) minefield_pages
+ region_start
;
343 static void minefield_free(void *ptr
)
345 int region_start
, i
, j
;
347 minefield_admin_hide(0);
349 region_start
= (char *) ptr
- (char *) minefield_pages
;
350 i
= region_start
/ PAGESIZE
;
351 if (i
< 0 || i
>= minefield_npages
||
352 minefield_admin
[i
] != region_start
% PAGESIZE
)
354 for (j
= i
; j
< minefield_npages
&& minefield_admin
[j
] != 0xFFFF; j
++) {
355 minefield_admin
[j
] = 0xFFFF;
358 VirtualFree(ptr
, j
* PAGESIZE
- region_start
, MEM_DECOMMIT
);
360 minefield_admin_hide(1);
363 static int minefield_get_size(void *ptr
)
365 int region_start
, i
, j
;
367 minefield_admin_hide(0);
369 region_start
= (char *) ptr
- (char *) minefield_pages
;
370 i
= region_start
/ PAGESIZE
;
371 if (i
< 0 || i
>= minefield_npages
||
372 minefield_admin
[i
] != region_start
% PAGESIZE
)
374 for (j
= i
; j
< minefield_npages
&& minefield_admin
[j
] != 0xFFFF; j
++);
376 minefield_admin_hide(1);
378 return j
* PAGESIZE
- region_start
;
381 void *minefield_c_malloc(size_t size
)
383 if (!minefield_initialised
)
385 return minefield_alloc(size
);
388 void minefield_c_free(void *p
)
390 if (!minefield_initialised
)
396 * realloc _always_ moves the chunk, for rapid detection of code
397 * that assumes it won't.
399 void *minefield_c_realloc(void *p
, size_t size
)
403 if (!minefield_initialised
)
405 q
= minefield_alloc(size
);
406 oldsize
= minefield_get_size(p
);
407 memcpy(q
, p
, (oldsize
< size ? oldsize
: size
));
412 #endif /* MINEFIELD */
414 FontSpec
*fontspec_new(const char *name
,
415 int bold
, int height
, int charset
)
417 FontSpec
*f
= snew(FontSpec
);
418 f
->name
= dupstr(name
);
421 f
->charset
= charset
;
424 FontSpec
*fontspec_copy(const FontSpec
*f
)
426 return fontspec_new(f
->name
, f
->isbold
, f
->height
, f
->charset
);
428 void fontspec_free(FontSpec
*f
)
433 int fontspec_serialise(FontSpec
*f
, void *vdata
)
435 char *data
= (char *)vdata
;
436 int len
= strlen(f
->name
) + 1; /* include trailing NUL */
438 strcpy(data
, f
->name
);
439 PUT_32BIT_MSB_FIRST(data
+ len
, f
->isbold
);
440 PUT_32BIT_MSB_FIRST(data
+ len
+ 4, f
->height
);
441 PUT_32BIT_MSB_FIRST(data
+ len
+ 8, f
->charset
);
443 return len
+ 12; /* also include three 4-byte ints */
445 FontSpec
*fontspec_deserialise(void *vdata
, int maxsize
, int *used
)
447 char *data
= (char *)vdata
;
451 end
= memchr(data
, '\0', maxsize
-12);
455 *used
= end
- data
+ 12;
456 return fontspec_new(data
,
457 GET_32BIT_MSB_FIRST(end
),
458 GET_32BIT_MSB_FIRST(end
+ 4),
459 GET_32BIT_MSB_FIRST(end
+ 8));