Syslinux - Mar 2009 - [PATCH 1/1] cmd.c32: allow an option for clearing the screen

From: Gene Cumm <gene.cumm at gmail.com>

COM32/cmd.c32: Allow an option for clearing the screen

Signed-off-by: Gene Cumm <gene.cumm at gmail.com>

---

If "-c" is the first option to cmd.c32, it will first clear the screen
by dumping a series of newlines to the screen.

Applies against current head.


diff --git a/com32/modules/cmd.c b/com32/modules/cmd.c
index e1d646b..ff54128 100644
--- a/com32/modules/cmd.c
+++ b/com32/modules/cmd.c
@@ -20,19 +20,29 @@
 #include <alloca.h>
 #include <com32.h>

+#define NUM_NL 40
+       /* Number of lines to clear */
+
 int main(int argc, const char *argv[])
 {
   size_t len = 0;
   char *cmd;
   char *tmp;
   int i;
+  int argst = 1;       /* Starting argument */
+
+  if (strcmp(argv[1], "-c") == 0) {
+    argst++;
+    for (i = 0; i < NUM_NL; i++)
+      printf("\n");
+  }

-  for (i = 1; i < argc; i++)
+  for (i = argst; i < argc; i++)
     len += strlen(argv[i]) + 1;

   tmp = cmd = alloca(len);

-  for (i = 1; i < argc; i++) {
+  for (i = argst; i < argc; i++) {
     tmp = strpcpy(tmp, argv[i]);
     if (i != argc-1)
       *tmp++ = ' ';

Gene Cumm wrote:
> 
> If "-c" is the first option to cmd.c32, it will first clear the
screen
> by dumping a series of newlines to the screen.
> 
> Applies against current head.
> 
Double NAK.

First of all, I just removed the console dependencies to cmd.c32, which
cut it down from 5K to some 600 bytes.  Second, dumping newlines to the
screen isn't really the best way to clear.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.