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authormarha <marha@users.sourceforge.net>2014-04-14 23:43:21 +0200
committermarha <marha@users.sourceforge.net>2014-04-14 23:43:21 +0200
commita3fe3e22d85e8aa795df85c21814fc84cac42e99 (patch)
tree0b696c0a3e836781bc527015dcd28cacc9d0ef9f /tools/plink/winmisc.c
parent242d48135a12fc9167430f391ba0d27d9ad44c6b (diff)
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plink: updated to revision 10170 of putty
Diffstat (limited to 'tools/plink/winmisc.c')
-rw-r--r--tools/plink/winmisc.c990
1 files changed, 530 insertions, 460 deletions
diff --git a/tools/plink/winmisc.c b/tools/plink/winmisc.c
index e8a35ee1d..3b57adf8f 100644
--- a/tools/plink/winmisc.c
+++ b/tools/plink/winmisc.c
@@ -1,460 +1,530 @@
-/*
- * winmisc.c: miscellaneous Windows-specific things
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include "putty.h"
-#include <security.h>
-
-OSVERSIONINFO osVersion;
-
-char *platform_get_x_display(void) {
- /* We may as well check for DISPLAY in case it's useful. */
- return dupstr(getenv("DISPLAY"));
-}
-
-Filename *filename_from_str(const char *str)
-{
- Filename *ret = snew(Filename);
- ret->path = dupstr(str);
- return ret;
-}
-
-Filename *filename_copy(const Filename *fn)
-{
- return filename_from_str(fn->path);
-}
-
-const char *filename_to_str(const Filename *fn)
-{
- return fn->path;
-}
-
-int filename_equal(const Filename *f1, const Filename *f2)
-{
- return !strcmp(f1->path, f2->path);
-}
-
-int filename_is_null(const Filename *fn)
-{
- return !*fn->path;
-}
-
-void filename_free(Filename *fn)
-{
- sfree(fn->path);
- sfree(fn);
-}
-
-int filename_serialise(const Filename *f, void *vdata)
-{
- char *data = (char *)vdata;
- int len = strlen(f->path) + 1; /* include trailing NUL */
- if (data) {
- strcpy(data, f->path);
- }
- return len;
-}
-Filename *filename_deserialise(void *vdata, int maxsize, int *used)
-{
- char *data = (char *)vdata;
- char *end;
- end = memchr(data, '\0', maxsize);
- if (!end)
- return NULL;
- end++;
- *used = end - data;
- return filename_from_str(data);
-}
-
-char *get_username(void)
-{
- DWORD namelen;
- char *user;
- int got_username = FALSE;
- DECL_WINDOWS_FUNCTION(static, BOOLEAN, GetUserNameExA,
- (EXTENDED_NAME_FORMAT, LPSTR, PULONG));
-
- {
- static int tried_usernameex = FALSE;
- if (!tried_usernameex) {
- /* Not available on Win9x, so load dynamically */
- HMODULE secur32 = load_system32_dll("secur32.dll");
- GET_WINDOWS_FUNCTION(secur32, GetUserNameExA);
- tried_usernameex = TRUE;
- }
- }
-
- if (p_GetUserNameExA) {
- /*
- * If available, use the principal -- this avoids the problem
- * that the local username is case-insensitive but Kerberos
- * usernames are case-sensitive.
- */
-
- /* Get the length */
- namelen = 0;
- (void) p_GetUserNameExA(NameUserPrincipal, NULL, &namelen);
-
- user = snewn(namelen, char);
- got_username = p_GetUserNameExA(NameUserPrincipal, user, &namelen);
- if (got_username) {
- char *p = strchr(user, '@');
- if (p) *p = 0;
- } else {
- sfree(user);
- }
- }
-
- if (!got_username) {
- /* Fall back to local user name */
- namelen = 0;
- if (GetUserName(NULL, &namelen) == FALSE) {
- /*
- * Apparently this doesn't work at least on Windows XP SP2.
- * Thus assume a maximum of 256. It will fail again if it
- * doesn't fit.
- */
- namelen = 256;
- }
-
- user = snewn(namelen, char);
- got_username = GetUserName(user, &namelen);
- if (!got_username) {
- sfree(user);
- }
- }
-
- return got_username ? user : NULL;
-}
-
-BOOL init_winver(void)
-{
- ZeroMemory(&osVersion, sizeof(osVersion));
- osVersion.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
- return GetVersionEx ( (OSVERSIONINFO *) &osVersion);
-}
-
-HMODULE load_system32_dll(const char *libname)
-{
- /*
- * Wrapper function to load a DLL out of c:\windows\system32
- * without going through the full DLL search path. (Hence no
- * attack is possible by placing a substitute DLL earlier on that
- * path.)
- */
- static char *sysdir = NULL;
- char *fullpath;
- HMODULE ret;
-
- if (!sysdir) {
- int size = 0, len;
- do {
- size = 3*size/2 + 512;
- sysdir = sresize(sysdir, size, char);
- len = GetSystemDirectory(sysdir, size);
- } while (len >= size);
- }
-
- fullpath = dupcat(sysdir, "\\", libname, NULL);
- ret = LoadLibrary(fullpath);
- sfree(fullpath);
- return ret;
-}
-
-#ifdef DEBUG
-static FILE *debug_fp = NULL;
-static HANDLE debug_hdl = INVALID_HANDLE_VALUE;
-static int debug_got_console = 0;
-
-void dputs(char *buf)
-{
- DWORD dw;
-
- if (!debug_got_console) {
- if (AllocConsole()) {
- debug_got_console = 1;
- debug_hdl = GetStdHandle(STD_OUTPUT_HANDLE);
- }
- }
- if (!debug_fp) {
- debug_fp = fopen("debug.log", "w");
- }
-
- if (debug_hdl != INVALID_HANDLE_VALUE) {
- WriteFile(debug_hdl, buf, strlen(buf), &dw, NULL);
- }
- fputs(buf, debug_fp);
- fflush(debug_fp);
-}
-#endif
-
-#ifdef MINEFIELD
-/*
- * Minefield - a Windows equivalent for Electric Fence
- */
-
-#define PAGESIZE 4096
-
-/*
- * Design:
- *
- * We start by reserving as much virtual address space as Windows
- * will sensibly (or not sensibly) let us have. We flag it all as
- * invalid memory.
- *
- * Any allocation attempt is satisfied by committing one or more
- * pages, with an uncommitted page on either side. The returned
- * memory region is jammed up against the _end_ of the pages.
- *
- * Freeing anything causes instantaneous decommitment of the pages
- * involved, so stale pointers are caught as soon as possible.
- */
-
-static int minefield_initialised = 0;
-static void *minefield_region = NULL;
-static long minefield_size = 0;
-static long minefield_npages = 0;
-static long minefield_curpos = 0;
-static unsigned short *minefield_admin = NULL;
-static void *minefield_pages = NULL;
-
-static void minefield_admin_hide(int hide)
-{
- int access = hide ? PAGE_NOACCESS : PAGE_READWRITE;
- VirtualProtect(minefield_admin, minefield_npages * 2, access, NULL);
-}
-
-static void minefield_init(void)
-{
- int size;
- int admin_size;
- int i;
-
- for (size = 0x40000000; size > 0; size = ((size >> 3) * 7) & ~0xFFF) {
- minefield_region = VirtualAlloc(NULL, size,
- MEM_RESERVE, PAGE_NOACCESS);
- if (minefield_region)
- break;
- }
- minefield_size = size;
-
- /*
- * Firstly, allocate a section of that to be the admin block.
- * We'll need a two-byte field for each page.
- */
- minefield_admin = minefield_region;
- minefield_npages = minefield_size / PAGESIZE;
- admin_size = (minefield_npages * 2 + PAGESIZE - 1) & ~(PAGESIZE - 1);
- minefield_npages = (minefield_size - admin_size) / PAGESIZE;
- minefield_pages = (char *) minefield_region + admin_size;
-
- /*
- * Commit the admin region.
- */
- VirtualAlloc(minefield_admin, minefield_npages * 2,
- MEM_COMMIT, PAGE_READWRITE);
-
- /*
- * Mark all pages as unused (0xFFFF).
- */
- for (i = 0; i < minefield_npages; i++)
- minefield_admin[i] = 0xFFFF;
-
- /*
- * Hide the admin region.
- */
- minefield_admin_hide(1);
-
- minefield_initialised = 1;
-}
-
-static void minefield_bomb(void)
-{
- div(1, *(int *) minefield_pages);
-}
-
-static void *minefield_alloc(int size)
-{
- int npages;
- int pos, lim, region_end, region_start;
- int start;
- int i;
-
- npages = (size + PAGESIZE - 1) / PAGESIZE;
-
- minefield_admin_hide(0);
-
- /*
- * Search from current position until we find a contiguous
- * bunch of npages+2 unused pages.
- */
- pos = minefield_curpos;
- lim = minefield_npages;
- while (1) {
- /* Skip over used pages. */
- while (pos < lim && minefield_admin[pos] != 0xFFFF)
- pos++;
- /* Count unused pages. */
- start = pos;
- while (pos < lim && pos - start < npages + 2 &&
- minefield_admin[pos] == 0xFFFF)
- pos++;
- if (pos - start == npages + 2)
- break;
- /* If we've reached the limit, reset the limit or stop. */
- if (pos >= lim) {
- if (lim == minefield_npages) {
- /* go round and start again at zero */
- lim = minefield_curpos;
- pos = 0;
- } else {
- minefield_admin_hide(1);
- return NULL;
- }
- }
- }
-
- minefield_curpos = pos - 1;
-
- /*
- * We have npages+2 unused pages starting at start. We leave
- * the first and last of these alone and use the rest.
- */
- region_end = (start + npages + 1) * PAGESIZE;
- region_start = region_end - size;
- /* FIXME: could align here if we wanted */
-
- /*
- * Update the admin region.
- */
- for (i = start + 2; i < start + npages + 1; i++)
- minefield_admin[i] = 0xFFFE; /* used but no region starts here */
- minefield_admin[start + 1] = region_start % PAGESIZE;
-
- minefield_admin_hide(1);
-
- VirtualAlloc((char *) minefield_pages + region_start, size,
- MEM_COMMIT, PAGE_READWRITE);
- return (char *) minefield_pages + region_start;
-}
-
-static void minefield_free(void *ptr)
-{
- int region_start, i, j;
-
- minefield_admin_hide(0);
-
- region_start = (char *) ptr - (char *) minefield_pages;
- i = region_start / PAGESIZE;
- if (i < 0 || i >= minefield_npages ||
- minefield_admin[i] != region_start % PAGESIZE)
- minefield_bomb();
- for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++) {
- minefield_admin[j] = 0xFFFF;
- }
-
- VirtualFree(ptr, j * PAGESIZE - region_start, MEM_DECOMMIT);
-
- minefield_admin_hide(1);
-}
-
-static int minefield_get_size(void *ptr)
-{
- int region_start, i, j;
-
- minefield_admin_hide(0);
-
- region_start = (char *) ptr - (char *) minefield_pages;
- i = region_start / PAGESIZE;
- if (i < 0 || i >= minefield_npages ||
- minefield_admin[i] != region_start % PAGESIZE)
- minefield_bomb();
- for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++);
-
- minefield_admin_hide(1);
-
- return j * PAGESIZE - region_start;
-}
-
-void *minefield_c_malloc(size_t size)
-{
- if (!minefield_initialised)
- minefield_init();
- return minefield_alloc(size);
-}
-
-void minefield_c_free(void *p)
-{
- if (!minefield_initialised)
- minefield_init();
- minefield_free(p);
-}
-
-/*
- * realloc _always_ moves the chunk, for rapid detection of code
- * that assumes it won't.
- */
-void *minefield_c_realloc(void *p, size_t size)
-{
- size_t oldsize;
- void *q;
- if (!minefield_initialised)
- minefield_init();
- q = minefield_alloc(size);
- oldsize = minefield_get_size(p);
- memcpy(q, p, (oldsize < size ? oldsize : size));
- minefield_free(p);
- return q;
-}
-
-#endif /* MINEFIELD */
-
-FontSpec *fontspec_new(const char *name,
- int bold, int height, int charset)
-{
- FontSpec *f = snew(FontSpec);
- f->name = dupstr(name);
- f->isbold = bold;
- f->height = height;
- f->charset = charset;
- return f;
-}
-FontSpec *fontspec_copy(const FontSpec *f)
-{
- return fontspec_new(f->name, f->isbold, f->height, f->charset);
-}
-void fontspec_free(FontSpec *f)
-{
- sfree(f->name);
- sfree(f);
-}
-int fontspec_serialise(FontSpec *f, void *vdata)
-{
- char *data = (char *)vdata;
- int len = strlen(f->name) + 1; /* include trailing NUL */
- if (data) {
- strcpy(data, f->name);
- PUT_32BIT_MSB_FIRST(data + len, f->isbold);
- PUT_32BIT_MSB_FIRST(data + len + 4, f->height);
- PUT_32BIT_MSB_FIRST(data + len + 8, f->charset);
- }
- return len + 12; /* also include three 4-byte ints */
-}
-FontSpec *fontspec_deserialise(void *vdata, int maxsize, int *used)
-{
- char *data = (char *)vdata;
- char *end;
- if (maxsize < 13)
- return NULL;
- end = memchr(data, '\0', maxsize-12);
- if (!end)
- return NULL;
- end++;
- *used = end - data + 12;
- return fontspec_new(data,
- GET_32BIT_MSB_FIRST(end),
- GET_32BIT_MSB_FIRST(end + 4),
- GET_32BIT_MSB_FIRST(end + 8));
-}
+/*
+ * winmisc.c: miscellaneous Windows-specific things
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "putty.h"
+#include <security.h>
+
+OSVERSIONINFO osVersion;
+
+char *platform_get_x_display(void) {
+ /* We may as well check for DISPLAY in case it's useful. */
+ return dupstr(getenv("DISPLAY"));
+}
+
+Filename *filename_from_str(const char *str)
+{
+ Filename *ret = snew(Filename);
+ ret->path = dupstr(str);
+ return ret;
+}
+
+Filename *filename_copy(const Filename *fn)
+{
+ return filename_from_str(fn->path);
+}
+
+const char *filename_to_str(const Filename *fn)
+{
+ return fn->path;
+}
+
+int filename_equal(const Filename *f1, const Filename *f2)
+{
+ return !strcmp(f1->path, f2->path);
+}
+
+int filename_is_null(const Filename *fn)
+{
+ return !*fn->path;
+}
+
+void filename_free(Filename *fn)
+{
+ sfree(fn->path);
+ sfree(fn);
+}
+
+int filename_serialise(const Filename *f, void *vdata)
+{
+ char *data = (char *)vdata;
+ int len = strlen(f->path) + 1; /* include trailing NUL */
+ if (data) {
+ strcpy(data, f->path);
+ }
+ return len;
+}
+Filename *filename_deserialise(void *vdata, int maxsize, int *used)
+{
+ char *data = (char *)vdata;
+ char *end;
+ end = memchr(data, '\0', maxsize);
+ if (!end)
+ return NULL;
+ end++;
+ *used = end - data;
+ return filename_from_str(data);
+}
+
+#ifndef NO_SECUREZEROMEMORY
+/*
+ * Windows implementation of smemclr (see misc.c) using SecureZeroMemory.
+ */
+void smemclr(void *b, size_t n) {
+ if (b && n > 0)
+ SecureZeroMemory(b, n);
+}
+#endif
+
+char *get_username(void)
+{
+ DWORD namelen;
+ char *user;
+ int got_username = FALSE;
+ DECL_WINDOWS_FUNCTION(static, BOOLEAN, GetUserNameExA,
+ (EXTENDED_NAME_FORMAT, LPSTR, PULONG));
+
+ {
+ static int tried_usernameex = FALSE;
+ if (!tried_usernameex) {
+ /* Not available on Win9x, so load dynamically */
+ HMODULE secur32 = load_system32_dll("secur32.dll");
+ GET_WINDOWS_FUNCTION(secur32, GetUserNameExA);
+ tried_usernameex = TRUE;
+ }
+ }
+
+ if (p_GetUserNameExA) {
+ /*
+ * If available, use the principal -- this avoids the problem
+ * that the local username is case-insensitive but Kerberos
+ * usernames are case-sensitive.
+ */
+
+ /* Get the length */
+ namelen = 0;
+ (void) p_GetUserNameExA(NameUserPrincipal, NULL, &namelen);
+
+ user = snewn(namelen, char);
+ got_username = p_GetUserNameExA(NameUserPrincipal, user, &namelen);
+ if (got_username) {
+ char *p = strchr(user, '@');
+ if (p) *p = 0;
+ } else {
+ sfree(user);
+ }
+ }
+
+ if (!got_username) {
+ /* Fall back to local user name */
+ namelen = 0;
+ if (GetUserName(NULL, &namelen) == FALSE) {
+ /*
+ * Apparently this doesn't work at least on Windows XP SP2.
+ * Thus assume a maximum of 256. It will fail again if it
+ * doesn't fit.
+ */
+ namelen = 256;
+ }
+
+ user = snewn(namelen, char);
+ got_username = GetUserName(user, &namelen);
+ if (!got_username) {
+ sfree(user);
+ }
+ }
+
+ return got_username ? user : NULL;
+}
+
+BOOL init_winver(void)
+{
+ ZeroMemory(&osVersion, sizeof(osVersion));
+ osVersion.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
+ return GetVersionEx ( (OSVERSIONINFO *) &osVersion);
+}
+
+HMODULE load_system32_dll(const char *libname)
+{
+ /*
+ * Wrapper function to load a DLL out of c:\windows\system32
+ * without going through the full DLL search path. (Hence no
+ * attack is possible by placing a substitute DLL earlier on that
+ * path.)
+ */
+ static char *sysdir = NULL;
+ char *fullpath;
+ HMODULE ret;
+
+ if (!sysdir) {
+ int size = 0, len;
+ do {
+ size = 3*size/2 + 512;
+ sysdir = sresize(sysdir, size, char);
+ len = GetSystemDirectory(sysdir, size);
+ } while (len >= size);
+ }
+
+ fullpath = dupcat(sysdir, "\\", libname, NULL);
+ ret = LoadLibrary(fullpath);
+ sfree(fullpath);
+ return ret;
+}
+
+/*
+ * A tree234 containing mappings from system error codes to strings.
+ */
+
+struct errstring {
+ int error;
+ char *text;
+};
+
+static int errstring_find(void *av, void *bv)
+{
+ int *a = (int *)av;
+ struct errstring *b = (struct errstring *)bv;
+ if (*a < b->error)
+ return -1;
+ if (*a > b->error)
+ return +1;
+ return 0;
+}
+static int errstring_compare(void *av, void *bv)
+{
+ struct errstring *a = (struct errstring *)av;
+ return errstring_find(&a->error, bv);
+}
+
+static tree234 *errstrings = NULL;
+
+const char *win_strerror(int error)
+{
+ struct errstring *es;
+
+ if (!errstrings)
+ errstrings = newtree234(errstring_compare);
+
+ es = find234(errstrings, &error, errstring_find);
+
+ if (!es) {
+ char msgtext[65536]; /* maximum size for FormatMessage is 64K */
+
+ es = snew(struct errstring);
+ es->error = error;
+ if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM |
+ FORMAT_MESSAGE_IGNORE_INSERTS), NULL, error,
+ MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+ msgtext, lenof(msgtext)-1, NULL)) {
+ sprintf(msgtext,
+ "(unable to format: FormatMessage returned %d)",
+ error, GetLastError());
+ } else {
+ int len = strlen(msgtext);
+ if (len > 0 && msgtext[len-1] == '\n')
+ msgtext[len-1] = '\0';
+ }
+ es->text = dupprintf("Error %d: %s", error, msgtext);
+ add234(errstrings, es);
+ }
+
+ return es->text;
+}
+
+#ifdef DEBUG
+static FILE *debug_fp = NULL;
+static HANDLE debug_hdl = INVALID_HANDLE_VALUE;
+static int debug_got_console = 0;
+
+void dputs(char *buf)
+{
+ DWORD dw;
+
+ if (!debug_got_console) {
+ if (AllocConsole()) {
+ debug_got_console = 1;
+ debug_hdl = GetStdHandle(STD_OUTPUT_HANDLE);
+ }
+ }
+ if (!debug_fp) {
+ debug_fp = fopen("debug.log", "w");
+ }
+
+ if (debug_hdl != INVALID_HANDLE_VALUE) {
+ WriteFile(debug_hdl, buf, strlen(buf), &dw, NULL);
+ }
+ fputs(buf, debug_fp);
+ fflush(debug_fp);
+}
+#endif
+
+#ifdef MINEFIELD
+/*
+ * Minefield - a Windows equivalent for Electric Fence
+ */
+
+#define PAGESIZE 4096
+
+/*
+ * Design:
+ *
+ * We start by reserving as much virtual address space as Windows
+ * will sensibly (or not sensibly) let us have. We flag it all as
+ * invalid memory.
+ *
+ * Any allocation attempt is satisfied by committing one or more
+ * pages, with an uncommitted page on either side. The returned
+ * memory region is jammed up against the _end_ of the pages.
+ *
+ * Freeing anything causes instantaneous decommitment of the pages
+ * involved, so stale pointers are caught as soon as possible.
+ */
+
+static int minefield_initialised = 0;
+static void *minefield_region = NULL;
+static long minefield_size = 0;
+static long minefield_npages = 0;
+static long minefield_curpos = 0;
+static unsigned short *minefield_admin = NULL;
+static void *minefield_pages = NULL;
+
+static void minefield_admin_hide(int hide)
+{
+ int access = hide ? PAGE_NOACCESS : PAGE_READWRITE;
+ VirtualProtect(minefield_admin, minefield_npages * 2, access, NULL);
+}
+
+static void minefield_init(void)
+{
+ int size;
+ int admin_size;
+ int i;
+
+ for (size = 0x40000000; size > 0; size = ((size >> 3) * 7) & ~0xFFF) {
+ minefield_region = VirtualAlloc(NULL, size,
+ MEM_RESERVE, PAGE_NOACCESS);
+ if (minefield_region)
+ break;
+ }
+ minefield_size = size;
+
+ /*
+ * Firstly, allocate a section of that to be the admin block.
+ * We'll need a two-byte field for each page.
+ */
+ minefield_admin = minefield_region;
+ minefield_npages = minefield_size / PAGESIZE;
+ admin_size = (minefield_npages * 2 + PAGESIZE - 1) & ~(PAGESIZE - 1);
+ minefield_npages = (minefield_size - admin_size) / PAGESIZE;
+ minefield_pages = (char *) minefield_region + admin_size;
+
+ /*
+ * Commit the admin region.
+ */
+ VirtualAlloc(minefield_admin, minefield_npages * 2,
+ MEM_COMMIT, PAGE_READWRITE);
+
+ /*
+ * Mark all pages as unused (0xFFFF).
+ */
+ for (i = 0; i < minefield_npages; i++)
+ minefield_admin[i] = 0xFFFF;
+
+ /*
+ * Hide the admin region.
+ */
+ minefield_admin_hide(1);
+
+ minefield_initialised = 1;
+}
+
+static void minefield_bomb(void)
+{
+ div(1, *(int *) minefield_pages);
+}
+
+static void *minefield_alloc(int size)
+{
+ int npages;
+ int pos, lim, region_end, region_start;
+ int start;
+ int i;
+
+ npages = (size + PAGESIZE - 1) / PAGESIZE;
+
+ minefield_admin_hide(0);
+
+ /*
+ * Search from current position until we find a contiguous
+ * bunch of npages+2 unused pages.
+ */
+ pos = minefield_curpos;
+ lim = minefield_npages;
+ while (1) {
+ /* Skip over used pages. */
+ while (pos < lim && minefield_admin[pos] != 0xFFFF)
+ pos++;
+ /* Count unused pages. */
+ start = pos;
+ while (pos < lim && pos - start < npages + 2 &&
+ minefield_admin[pos] == 0xFFFF)
+ pos++;
+ if (pos - start == npages + 2)
+ break;
+ /* If we've reached the limit, reset the limit or stop. */
+ if (pos >= lim) {
+ if (lim == minefield_npages) {
+ /* go round and start again at zero */
+ lim = minefield_curpos;
+ pos = 0;
+ } else {
+ minefield_admin_hide(1);
+ return NULL;
+ }
+ }
+ }
+
+ minefield_curpos = pos - 1;
+
+ /*
+ * We have npages+2 unused pages starting at start. We leave
+ * the first and last of these alone and use the rest.
+ */
+ region_end = (start + npages + 1) * PAGESIZE;
+ region_start = region_end - size;
+ /* FIXME: could align here if we wanted */
+
+ /*
+ * Update the admin region.
+ */
+ for (i = start + 2; i < start + npages + 1; i++)
+ minefield_admin[i] = 0xFFFE; /* used but no region starts here */
+ minefield_admin[start + 1] = region_start % PAGESIZE;
+
+ minefield_admin_hide(1);
+
+ VirtualAlloc((char *) minefield_pages + region_start, size,
+ MEM_COMMIT, PAGE_READWRITE);
+ return (char *) minefield_pages + region_start;
+}
+
+static void minefield_free(void *ptr)
+{
+ int region_start, i, j;
+
+ minefield_admin_hide(0);
+
+ region_start = (char *) ptr - (char *) minefield_pages;
+ i = region_start / PAGESIZE;
+ if (i < 0 || i >= minefield_npages ||
+ minefield_admin[i] != region_start % PAGESIZE)
+ minefield_bomb();
+ for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++) {
+ minefield_admin[j] = 0xFFFF;
+ }
+
+ VirtualFree(ptr, j * PAGESIZE - region_start, MEM_DECOMMIT);
+
+ minefield_admin_hide(1);
+}
+
+static int minefield_get_size(void *ptr)
+{
+ int region_start, i, j;
+
+ minefield_admin_hide(0);
+
+ region_start = (char *) ptr - (char *) minefield_pages;
+ i = region_start / PAGESIZE;
+ if (i < 0 || i >= minefield_npages ||
+ minefield_admin[i] != region_start % PAGESIZE)
+ minefield_bomb();
+ for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++);
+
+ minefield_admin_hide(1);
+
+ return j * PAGESIZE - region_start;
+}
+
+void *minefield_c_malloc(size_t size)
+{
+ if (!minefield_initialised)
+ minefield_init();
+ return minefield_alloc(size);
+}
+
+void minefield_c_free(void *p)
+{
+ if (!minefield_initialised)
+ minefield_init();
+ minefield_free(p);
+}
+
+/*
+ * realloc _always_ moves the chunk, for rapid detection of code
+ * that assumes it won't.
+ */
+void *minefield_c_realloc(void *p, size_t size)
+{
+ size_t oldsize;
+ void *q;
+ if (!minefield_initialised)
+ minefield_init();
+ q = minefield_alloc(size);
+ oldsize = minefield_get_size(p);
+ memcpy(q, p, (oldsize < size ? oldsize : size));
+ minefield_free(p);
+ return q;
+}
+
+#endif /* MINEFIELD */
+
+FontSpec *fontspec_new(const char *name,
+ int bold, int height, int charset)
+{
+ FontSpec *f = snew(FontSpec);
+ f->name = dupstr(name);
+ f->isbold = bold;
+ f->height = height;
+ f->charset = charset;
+ return f;
+}
+FontSpec *fontspec_copy(const FontSpec *f)
+{
+ return fontspec_new(f->name, f->isbold, f->height, f->charset);
+}
+void fontspec_free(FontSpec *f)
+{
+ sfree(f->name);
+ sfree(f);
+}
+int fontspec_serialise(FontSpec *f, void *vdata)
+{
+ char *data = (char *)vdata;
+ int len = strlen(f->name) + 1; /* include trailing NUL */
+ if (data) {
+ strcpy(data, f->name);
+ PUT_32BIT_MSB_FIRST(data + len, f->isbold);
+ PUT_32BIT_MSB_FIRST(data + len + 4, f->height);
+ PUT_32BIT_MSB_FIRST(data + len + 8, f->charset);
+ }
+ return len + 12; /* also include three 4-byte ints */
+}
+FontSpec *fontspec_deserialise(void *vdata, int maxsize, int *used)
+{
+ char *data = (char *)vdata;
+ char *end;
+ if (maxsize < 13)
+ return NULL;
+ end = memchr(data, '\0', maxsize-12);
+ if (!end)
+ return NULL;
+ end++;
+ *used = end - data + 12;
+ return fontspec_new(data,
+ GET_32BIT_MSB_FIRST(end),
+ GET_32BIT_MSB_FIRST(end + 4),
+ GET_32BIT_MSB_FIRST(end + 8));
+}