For Gray mode added time stamp option, remove compiler warning

src/xcam.c

@@ -6,6 +6,8 @@
    The add_text routine and font_6x11.h file are taken from the (GPLed) 
    webcam.c file, part of xawtv,   (c) 1998-2002 Gerd Knorr.
    add_text was modified for this program (xcam_add_text).
+   Update 2008 Gerard Klaver
+   Added add_text routine to gray images.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
@@ -339,6 +341,8 @@ xcam_add_text (SANE_Byte * image, int width, int height, char *txt)
   int i, x, y, f, len;
   char fmtstring[25] = " %Y-%m-%d %H:%M:%S";
   char fmttxt[46];
+  char buf[100];
+
 
   DBG (DBG_debug, "xcam_add_text: enter\n");
   time (&t);
@@ -351,6 +355,10 @@ xcam_add_text (SANE_Byte * image, int width, int height, char *txt)
 
   len = strftime (line, MSG_MAXLEN, fmttxt, tm);
 
+  switch (win.params.format)
+    {
+    case SANE_FRAME_RGB:
+
       for (y = 0; y < CHAR_HEIGHT; y++)
 	{
 	  ptr = image + 3 * width * (height - CHAR_HEIGHT - 2 + y) + 12;
@@ -370,7 +378,33 @@ xcam_add_text (SANE_Byte * image, int width, int height, char *txt)
 		}		/* for i */
 	    }			/* for x */
 	}			/* for y */
+      break;
+    case SANE_FRAME_GRAY:
 
+      for (y = 0; y < CHAR_HEIGHT; y++)
+	{
+	  ptr = image + width * (height - CHAR_HEIGHT - 2 + y) + 12;
+
+	  for (x = 0; x < len; x++)
+	    {
+	      f = fontdata[line[x] * CHAR_HEIGHT + y];
+	      for (i = CHAR_WIDTH - 1; i >= 0; i--)
+		{
+		  if (f & (CHAR_START << i))
+		    {
+		      ptr[0] = 255;
+		    }
+		  ptr += 1;
+		}		/* for i */
+	    }			/* for x */
+	}			/* for y */
+    case SANE_FRAME_RED:
+    case SANE_FRAME_GREEN:
+    case SANE_FRAME_BLUE:
+      snprintf (buf, sizeof (buf),
+		"Time stamp for separate channel transfers are not supported");
+      break;
+    }
   DBG (DBG_debug, "xcam_add_text: exit vw=%d, vh=%d\n", width, height);
   status = (SANE_STATUS_GOOD);
   return status;
@@ -1107,7 +1141,7 @@ input_available (gpointer ignore, gint source, GdkInputCondition cond)
 	    (win.fps_old3 + win.fps_old2 + win.fps_old1 + win.fps) / 4;
 
 	  DBG (DBG_debug,
-	       "xcam: input_available fps count=%d, frame_time * 30 = %2.3f,  fps=%2.3f, fps_av=%2.3f\n",
+	       "xcam: input_available fps count=%ld, frame_time * 30 = %2.3f,  fps=%2.3f, fps_av=%2.3f\n",
 	       win.f_count, frame_time, win.fps, win.fps_av);
 	  win.i_time = 0;
 
@@ -1287,7 +1321,7 @@ save_frame_button (GtkWidget * widget, gpointer client_data,
 
       /* test for pnm formats */
       strncpy (testfilename, preferences.filename, sizeof (testfilename));
-      testfilename[sizeof (testfilename)] = 0;
+      testfilename[sizeof (testfilename) - 1] = 0;
       g_strreverse (testfilename);
       if (!((!strncmp (testfilename, "mnp.", 4)) ||
 	    (!strncmp (testfilename, "mgp.", 4)) ||
@@ -1597,7 +1631,8 @@ main (int argc, char **argv)
 	}
     }
 
-  DBG (DBG_debug, "xcam.main: buf_backend_size 0x%x\n", win.buf_backend_size);
+  DBG (DBG_debug, "xcam.main: buf_backend_size 0x%x\n",
+       (unsigned) win.buf_backend_size);
 
   win.buf = malloc (win.buf_backend_size);