Fixed major bug: drivers that accepted size arguments could wind

up with more than 80 characters (20x4) in their display, and thus
overwrite memory outside of the allocated 80 characterwframebuffer.

For example, using a 20x6 screen would do this.

All drivers now either ignore a missing framebuffer, or allocate it
themselves - the latter is prefered.

server/drivers/CFontz.c

@@ -187,11 +187,6 @@ CFontz_init (lcd_logical_driver * driver, char *args)
 	CFontz_autoscroll (0);
 	CFontz_backlight (backlight_brightness);
 
-	if (!driver->framebuf) {
-		syslog(LOG_ERR, "cfontz_init: no frame buffer!");
-		CFontz_close ();
-		return -1;
-	}
 	// Set the functions the driver supports...
 
 	driver->clear = CFontz_clear;

server/drivers/MtxOrb.c

@@ -361,12 +361,6 @@ MtxOrb_init (lcd_logical_driver * driver, char *args)
 	MtxOrb_cursorblink (DEFAULT_CURSORBLINK);
 	MtxOrb_contrast (contrast);
 
-	if (!driver->framebuf) {
-		syslog(LOG_ERR, "no frame buffer! exiting driver init...");
-		MtxOrb_close ();
-		return -1;
-	}
-
 	/*
 	 * Configure the display functions
 	 */

server/drivers/debug.c

@@ -26,13 +26,6 @@ debug_init (struct lcd_logical_driver *driver, char *args)
 
 	debug_drv = driver;
 
-	if (driver->framebuf)
-		syslog(LOG_INFO, "frame buffer at: %010X", (int) driver->framebuf);
-	else {
-		syslog(LOG_ERR, "no frame buffer!");
-		return -1;
-	}
-
 	debug_clear ();
 
 	driver->daemonize = 0;

server/drivers/lb216.c

@@ -196,15 +196,6 @@ int LB216_init(lcd_logical_driver *driver, char *args)
    LB216_hidecursor();
    LB216_backlight(backlight_brightness);
 
-   
-   if(!driver->framebuf)
-   {
-      fprintf(stderr, "LB216_init: No frame buffer.\n");
-      driver->close();
-      return -1;
-   }
-
-
    // Set the functions the driver supports...
 
    driver->clear =      LB216_clear;

server/drivers/lcd.c

@@ -445,18 +445,16 @@ lcd_add_driver (char *driver, char *args)
 		// Default settings for the driver...
 		lcd_drv_init(add, NULL);
 
-		memset(buf, '\0', sizeof(buf));
-		add->framebuf = buf; // *** HACK: makes drivers think framebuffer is allocated!
-
 		i = init_driver (add, args);
 
-		// Allocate space for a framebuffer... *AFTER* the driver
-		// has a chance to initialize height and width!!
-		if ((add->framebuf = malloc (add->wid * add->hgt)) == NULL) {
-			snprintf (buf, sizeof(buf), "couldn't allocate framebuffer for driver \"%s\"", driver);
-			syslog (LOG_ERR, buf);
-			// free (add);
-			return -1;
+		if (!add->framebuf) {
+			if ((add->framebuf = malloc (add->wid * add->hgt)) == NULL) {
+				snprintf (buf, sizeof(buf), "couldn't allocate framebuffer of %d chars for driver \"%s\"",
+					(add->wid * add->hgt), driver);
+				syslog (LOG_ERR, buf);
+				// free (add);
+				return -1;
+			}
 		}
 		memset (add->framebuf, ' ', (add->wid * add->hgt));
 

server/drivers/sed1520.c

@@ -217,12 +217,16 @@ sed1520_init (struct lcd_logical_driver *driver, char *args)
     writecommand (0xAF, CS1 + CS2);
     writecommand (0xC0, CS1 + CS2);
     selectpage (3);
+
+    driver->cellwid = 6;
+    driver->cellhgt = 8;
+
     // The Framebuffer LCDproc allocates by default is too small,
-    // so we free() it and allocate one of adequate size.
+    // so we free() it (if it exists) and allocate one of adequate size.
     if (!driver->framebuf)
 	free (driver->framebuf);
 
-    driver->framebuf = malloc (488);
+    driver->framebuf = malloc (122 * 4);
     if (!driver->framebuf)
       {
 	  sed1520_close ();
@@ -232,10 +236,6 @@ sed1520_init (struct lcd_logical_driver *driver, char *args)
     // clear screen
     memset (driver->framebuf, 0, 122 * 4);
 
-    driver->cellwid = 6;
-    driver->cellhgt = 8;	// FIXME: sed1520->cellwid always stays 5
-    // regardless what it is set to here. This is
-    //  a bug but not inside this driver.
     driver->clear = sed1520_clear;
     driver->string = sed1520_string;
     driver->chr = sed1520_chr;

server/drivers/stv5730.c

@@ -447,9 +447,8 @@ stv5730_init (struct lcd_logical_driver *driver, char *args)
     memset (driver->framebuf, 0, STV5730_WID * STV5730_HGT);
 
     driver->cellwid = 4;
-    driver->cellhgt = 6;	// FIXME: stv5730->cellwid always stays 5
-    // regardless what it is set to here. This is
-    // a bug but not inside this driver.
+    driver->cellhgt = 6;
+
     driver->clear = stv5730_clear;
     driver->string = stv5730_string;
     driver->chr = stv5730_chr;

server/drivers/text.c

@@ -38,12 +38,6 @@ text_init (lcd_logical_driver * driver, char *args)
 {
 	text = driver;
 
-	if (!text->framebuf) {
-		syslog(LOG_ERR, "text: no frame buffer!");
-		text_close ();
-		return -1;
-	}
-
 	text->wid = LCD_DEFAULT_WIDTH;
 	text->hgt = LCD_DEFAULT_HEIGHT;
 	text->cellwid = LCD_DEFAULT_CELL_WIDTH;

server/drivers/wirz-sli.c

@@ -148,11 +148,6 @@ sli_init (lcd_logical_driver * driver, char *args)
 	out[1] = 0x001;				  /* Clear LCD, not sure if this belongs here */
 	write (fd, out, 2);
 
-	if (!driver->framebuf) {
-		fprintf (stderr, "sli_init: No frame buffer.\n");
-		sli_close ();
-		return -1;
-	}
 	// Set LCD parameters (I use a 16x2 LCD) -- small but still useful
 	// Its also much cheaper than the higher quality Matrix Orbital modules
 	// Currently, $30 for interface kit and 16x2 non-backlit LCD...