diff options
Diffstat (limited to 'mingw.c')
| -rw-r--r-- | mingw.c | 171 |
1 files changed, 171 insertions, 0 deletions
@@ -0,0 +1,171 @@ +
+static char rcsid[] = "$Header: /home/sater/bridge/bigdeal/RCS/dos.c,v 1.9 2000/08/26 14:15:22 sater Exp $";
+
+#include <windows.h>
+#include <conio.h>
+#include <time.h>
+#include <ctype.h>
+#include <stdio.h>
+#include "types.h"
+#include "bigdeal.h"
+#include "collect.h"
+
+extern FILE *flog;
+
+static int highfreqclock;
+static LARGE_INTEGER frequency, epoch;
+
+void
+os_start()
+{
+
+ /*
+ * Start the clock running
+ */
+ if (QueryPerformanceFrequency(&frequency) == 0) {
+ highfreqclock = 0;
+ } else {
+ highfreqclock = 1;
+ QueryPerformanceCounter(&epoch);
+ if (flog)
+ fprintf(flog, "Clock frequency %I64d, epoch %I64d\n",
+ frequency.QuadPart, epoch.QuadPart);
+ }
+}
+
+void
+os_finish()
+{
+
+}
+
+int bestclock()
+{
+ LARGE_INTEGER t;
+
+ if (highfreqclock) {
+ QueryPerformanceCounter(&t);
+ /* compute the elapsed time in ticks */
+ return (t.QuadPart - epoch.QuadPart);
+ }
+#ifdef UCLOCKS_PER_SEC
+ return (int) uclock();
+#else
+#ifdef CLOCKS_PER_SEC
+ return (int) clock();
+#else
+There is no clock, this program needs it, so do not compile
+#endif
+#endif
+}
+
+#define MAX_INTERVAL_ENTROPY 6
+
+int
+getchtm(int *nbits)
+/*
+ * Read one character from standard input
+ * Time the wait, and use bits for random
+ * MUST be in cbreak mode for this to work
+ */
+{
+ int t1, t2;
+ int tdiff;
+ int c;
+ int shift;
+ int b;
+
+ /*
+ * First get the best clock we have
+ */
+ t1 = bestclock();
+ /*
+ * Now get one character
+ */
+ c = getch();
+ /*
+ * If it is zero, which can happen with getch() under DOS
+ * we have a two character sequence(function key probably)
+ * and we make one character out of it by appending the next
+ */
+ if (c == 0)
+ c = getch() + 256;
+ /*
+ * and get the clock after the keypress
+ */
+ t2 = bestclock();
+ /*
+ * Number of ticks we waited goes to tdiff
+ */
+ tdiff = t2 - t1;
+ /*
+ * Now we are going to believe half the bits we get
+ */
+ for (shift = tdiff, b = 0; shift>2 ; shift >>= 2, b++)
+ ;
+ if (b < MAX_INTERVAL_ENTROPY)
+ *nbits = b;
+ else
+ *nbits = MAX_INTERVAL_ENTROPY;
+ /*
+ * We send all the bits to the collect pool
+ * but do not count the bits yet (parameter 0)
+ * because higher layers might decide not to believe this
+ * character, and its associated timing
+ */
+ collect_more((byte *) &t1, sizeof(t1), 0);
+ collect_more((byte *) &t2, sizeof(t2), 0);
+
+ if (flog)
+ fprintf(flog, "Collected character %d, timediff %d, timebits %d\n",
+ c, tdiff, b);
+ return c;
+}
+
+void
+os_collect() {
+ int pid;
+ FILETIME systime;
+
+ collect_more((byte *) &frequency, sizeof(frequency), 0);
+ collect_more((byte *) &epoch, sizeof(epoch), 8);
+ pid = getpid();
+ collect_more((byte *) &pid, sizeof(pid), 3);
+}
+
+void
+cbreak()
+{
+
+}
+
+void
+cooked()
+{
+
+}
+
+int
+legal_filename_prefix(char *s)
+/*
+ * Legal prefix to make legal name when three letter suffix added
+ */
+{
+
+ if (*s == 0) /* Too short */
+ return 0;
+ if (strlen(s) > 50)
+ return 0;
+ while (*s) {
+ if (!isalnum(*s) && *s != '-' && *s != '_')
+ return 0;
+ s++;
+ }
+ return 1;
+}
+
+char *os_init_file_name()
+{
+
+ return "bigdeal.ini";
+}
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