1 files changed, 114 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/SNIP/vidport.c b/reference/C/CONTRIB/SNIP/vidport.c
new file mode 100755
index 0000000..a3b3286
--- /dev/null
+++ b/reference/C/CONTRIB/SNIP/vidport.c
@@ -0,0 +1,114 @@
+/*
+**  Portable PC screen functions
+**  Public domain by Bob Stout
+**  Uses SCROLL.C, also from SNIPPETS
+*/
+ 
+#include <stdio.h>
+#include <dos.h>
+#include "scrnmacs.h"         /* Also in SNIPPETS     */
+
+void GotoXY(int col, int row)
+{
+      union REGS regs;
+
+      setbuf(stdout, NULL);
+      regs.h.dh = (unsigned)row;
+      regs.h.dl = (unsigned)col;
+      regs.h.bh = VIDPAGE;
+      regs.h.ah = 2;
+      int86(0x10, &regs, &regs);
+}
+
+void ClrScrn(int vattrib)
+{
+      scroll(SCROLL_UP, 0, vattrib, 0, 0, SCREENROWS, SCREENCOLS);
+      GotoXY(0, 0);                     /* Home cursor  */
+}
+
+void GetCurPos(int *col, int *row)
+{
+      union REGS regs;
+
+      regs.h.ah = 0x03;
+      regs.h.bh = VIDPAGE;
+      int86(0x10, &regs, &regs);
+      *row = regs.h.dh;
+      *col = regs.h.dl;
+}
+
+int GetCurAtr(void)
+{
+      int row, col;
+      unsigned short chat;
+
+      GetCurPos(&col, &row);
+      chat = *((unsigned FAR *)MK_FP(SCREENSEG,
+            (row * SCREENCOLS + col) << 1));
+      return (chat >> 8);
+}
+
+void ClrEol(void)
+{
+      int row, col;
+
+      GetCurPos(&col, &row);
+      scroll(0, 0, GetCurAtr(), row, col, row, SCREENCOLS);
+}
+
+void ClrEop(void)
+{
+      int row, col;
+
+      GetCurPos(&col, &row);
+      ClrEol();
+      if (++row < SCREENROWS)
+            scroll(0, 0, GetCurAtr(), row, 0, SCREENROWS, SCREENCOLS);
+}
+
+void Repaint(int vattrib)
+{
+      unsigned short FAR *screen = SCRBUFF;
+      int row, col;
+
+      for (row = 0; row < SCREENROWS; ++row)
+      {
+            for (col = 0; col < SCREENCOLS; ++col, ++screen)
+                  *screen = (*screen & 0xff) + (vattrib << 8);
+      }
+}
+
+#ifdef TEST
+
+#include <conio.h>
+
+/*
+**  Run this test with a screenful of misc. stuff
+*/
+
+main()
+{
+      int vatr = GetCurAtr();
+
+      GotoXY(1, 1);
+      fputs("Testing ClrEol()", stderr);
+      ClrEol();
+      fputs("\nHit any key to continue...\n", stderr);
+      getch();
+      fputs("Testing ClrEop()", stderr);
+      ClrEop();
+      fputs("\nHit any key to continue...\n", stderr);
+      getch();
+      ClrScrn(vatr);
+      GotoXY(0, 0);
+      fputs("ClrScrn() tested", stderr);
+      fputs("\nHit any key to continue...\n", stderr);
+      getch();
+      Repaint(BG_(CYAN) | BLACK);
+      fputs("Repaint() tested", stderr);
+      fputs("\nHit any key to continue...\n", stderr);
+      getch();
+      Repaint(vatr);
+}
+
+#endif