1 files changed, 74 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/SNIP/trapdemo.c b/reference/C/CONTRIB/SNIP/trapdemo.c
new file mode 100755
index 0000000..68c7387
--- /dev/null
+++ b/reference/C/CONTRIB/SNIP/trapdemo.c
@@ -0,0 +1,74 @@
+/*
+**  Demonstrate TRAPFLAG.ASM
+**
+**  public domain by Bob Stout
+*/
+
+#include <stdio.h>
+#include <dos.h>
+#include <int.h>
+
+extern void ins09(void);
+extern void undo09(void);
+
+extern volatile int far ccrcvd;
+
+static void biosprt(char *p)
+{
+      union REGS regs;
+
+      while (*p)
+      {
+            regs.h.ah = 0x0e;             /* Low-level services only!     */
+            regs.h.al = *p++;
+            regs.x.bx = 0;
+            int86(0x10, &regs, &regs);
+      }
+}
+
+static void far my_cc(void)
+{
+      char *p1 = "Ctrl-";
+      char *p2 = "C";
+      char *p3 = "Break";
+      char *p4 = " received\r\n";
+
+      biosprt(p1);
+      if (1 == ccrcvd)
+            biosprt(p2);
+      else  biosprt(p3);
+      biosprt(p4);
+}
+
+main()
+{
+      unsigned seg, ofs;
+      int ch = 0;
+
+      setbuf(stdout, NULL);
+      my_cc();
+      ins09();
+      atexit(undo09);
+      puts("New Ints 09h & 1Bh installed...");
+      puts("Hit Esc to quit...");
+      do
+      {
+            if (kbhit())
+            {
+                  if (0x1b != (ch = getch()))
+                  {
+                        if (0x20 > ch)
+                        {
+                              fputc('^', stdout);
+                              ch += '@';
+                        }
+                        fputc(ch, stdout);
+                  }
+            }
+            if (ccrcvd)
+            {
+                  my_cc();
+                  ccrcvd = 0;
+            }
+      } while (0x1b != ch);
+}