From 3fe24df1237a77549ba64c6331383a9a40aed1de Mon Sep 17 00:00:00 2001
From: emkael <emkael@tlen.pl>
Date: Sat, 25 Nov 2017 16:15:54 +0100
Subject: Initial BigDeal sources

---
 mingw.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 mingw.c

(limited to 'mingw.c')

diff --git a/mingw.c b/mingw.c
new file mode 100644
index 0000000..dbea580
--- /dev/null
+++ b/mingw.c
@@ -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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