new use of option -s (scaling): -s [width]x[heigth]

The new scaling variants set the maximum size in one or both directions.
If one of the sizes is omitted, the default paper size is assumed.

fped.c

@@ -1,8 +1,8 @@
 /*
  * fped.c - Footprint editor, main function
  *
- * Written 2009-2011 by Werner Almesberger
+ * Written 2009-2012 by Werner Almesberger
- * Copyright 2009-2011 by Werner Almesberger
+ * Copyright 2009-2012 by Werner Almesberger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -80,12 +80,38 @@ static void usage(const char *name)
 "Common options:\n"
 "  -1 name     output only the specified package\n"
 "  -s scale    scale factor for -P (default: auto-scale)\n"
+"  -s [width]x[heigth]\n"
+"              auto-scale to fit within specified box. Dimensions in mm.\n"
 "  cpp_option  -Idir, -Dname[=value], or -Uname\n"
     , name);
 	exit(1);
 }
 
 
+static int parse_scaling(const char *arg)
+{
+	const char *x;
+	char *end;
+
+	x = strchr(arg, 'x');
+	if (!x) {
+		postscript_params.zoom = strtod(arg, &end);
+		return !*end;
+	}
+	if (x != arg) {
+		postscript_params.max_width = mm_to_units(strtod(arg, &end));
+		if (*end != 'x')
+			return 0;
+	}
+	if (x[1]) {
+		postscript_params.max_height = mm_to_units(strtod(x+1, &end));
+		if (*end)
+			return 0;
+	}
+	return 1;
+}
+
+
 int main(int argc, char **argv)
 {
 	enum {
@@ -101,7 +127,6 @@ int main(int argc, char **argv)
 	char *args[2];
 	int fake_argc;
 	char opt[] = "-?";
-	char *end;
 	int error;
 	int test_mode = 0;
 	const char *one = NULL;
@@ -135,8 +160,7 @@ int main(int argc, char **argv)
 		case 's':
 			if (batch != batch_ps_fullpage)
 				usage(*argv);
-			postscript_params.zoom = strtod(optarg, &end);
+			if (!parse_scaling(optarg))
-			if (*end)
 				usage(*argv);
 			break;
 		case 'T':

postscript.c

@@ -93,6 +93,8 @@
 
 struct postscript_params postscript_params = {
 	.zoom		= 0,
+	.max_width	= 0,
+	.max_height	= 0,
 	.show_pad_names	= 1,
 	.show_stuff	= 0,
 	.label_vecs	= 0,
@@ -1129,6 +1131,7 @@ static void ps_package_fullpage(FILE *file, const struct pkg *pkg, int page)
 	unit_type cx, cy;
 	struct bbox bbox;
 	double fx, fy, f;
+	double d;
 
 	ps_page(file, page, pkg);
 	active_params = postscript_params;
@@ -1138,8 +1141,12 @@ static void ps_package_fullpage(FILE *file, const struct pkg *pkg, int page)
 	if (active_params.zoom) {
 		f = active_params.zoom;
 	} else {
-		fx = 2.0*PAGE_HALF_WIDTH/(bbox.max.x-bbox.min.x);
+		d = active_params.max_width ? active_params.max_width :
-		fy = 2.0*PAGE_HALF_HEIGHT/(bbox.max.y-bbox.min.y);
+		    2.0*PAGE_HALF_WIDTH;
+		fx = d/(bbox.max.x-bbox.min.x);
+		d = active_params.max_height ? active_params.max_height :
+		    2.0*PAGE_HALF_HEIGHT;
+		fy = d/(bbox.max.y-bbox.min.y);
 		f = fx < fy ? fx : fy;
 	}
 	fprintf(file, "%d %d translate\n", (int) (-cx*f), (int) (-cy*f));

postscript.h

@@ -1,8 +1,8 @@
 /*
  * postscript.h - Dump objects in Postscript
  *
- * Written 2009-2011 by Werner Almesberger
+ * Written 2009-2012 by Werner Almesberger
- * Copyright 2009-2011 by Werner Almesberger
+ * Copyright 2009-2012 by Werner Almesberger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -18,7 +18,9 @@
 
 
 struct postscript_params {
-        double zoom;
+        double zoom;		/* 0 for auto-zoom */
+	double max_width;	/* in fped units; 0 for paper width */
+	double max_height;	/* in fped units; 0 for paper height */
         int show_pad_names;
         int show_stuff;         /* vecs and frames */
         int label_vecs;