From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Fri, 28 Mar 2008 21:31:07 +0000 (-0400)
Subject: Prod/cons-ify readout so it can do realtime
X-Git-Url: http://git.joshuawise.com/mandelfpga.git/commitdiff_plain/834de336009362b05ceabd0c77924f72cd433ab6?ds=inline;hp=5930552f09758b3ad5ea890e492fa76bb579b992

Prod/cons-ify readout so it can do realtime
---

diff --git a/readout.c b/readout.c
index 9b92953..4ecae14 100644
--- a/readout.c
+++ b/readout.c
@@ -1,13 +1,46 @@
 #include <string.h>
 #include <SDL/SDL.h>
 
-#define WIN_X 1500
-#define WIN_Y 768
+#define WIN_X 800
+#define WIN_Y 600
+
+char getone()
+{
+	unsigned char c;
+	static char ring[2048];
+	static int prod = 0, cons = 0;
+	int oldcons;
+	
+	if (prod == cons)
+	{
+		int r;
+		/* Try to read some. */
+		while ((r = read(0, &(ring[prod]), 2048-prod)) == 0)
+			usleep(250000);
+		prod = (prod + r) % 2048;
+	}
+	oldcons = cons;
+	cons = (cons + 1) % 2048;
+	return ring[oldcons];
+}
 
 char *readline()
 {
 	static char s[2048];
-	return gets(s);	/* Insecure, oh well, who cares, this will get replaced later */
+	int i = 0;
+	
+	while (i < 2048)
+	{
+		s[i] = getone();
+		if (s[i] == '\r' || s[i] == '\n')
+		{
+			s[i] = '\0';
+			return s;
+		}
+		i++;
+	}
+	s[2047] = 0;
+	return s;
 }
 
 struct vars {
@@ -22,6 +55,7 @@ int *findvar(char *var, char *sub, struct vars *vars, int n)
 		if (!strcmp(vars[i].var, var) && ((!sub && !vars[i].sub) || !strcmp(vars[i].sub, sub)))
 			return &vars[i].val;
 	printf("Unknown var: %s %s\n", var, sub);
+	abort();
 }
 
 void main()
@@ -75,9 +109,9 @@ void main()
 				vars[nvars].val = 0;
 				nvars++;
 			}
-		} else if (s[0] == '#')
+		} else if (s[0] == '#' || !s[0])
 			;
-		else
+		else if (readingdata)
 		{
 			int val = (s[0] == '1');
 			int i;
@@ -121,7 +155,10 @@ void main()
 					{
 						x = 0;
 						if (!lasths)
+						{
 							y++;
+							SDL_Flip(screen);
+						}
 					} else
 						x++;
 				}