From 2bd88c14e52a8c1e96b8ef2a7e4f5ba990b59019 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Thu, 1 Feb 2024 05:01:02 -0500
Subject: Further simplify argument procesing, fix -abs negative offsets.

---
 xdeadzone.c | 106 +++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 62 insertions(+), 44 deletions(-)

(limited to 'xdeadzone.c')

diff --git a/xdeadzone.c b/xdeadzone.c
index a0398a8..5b89c94 100644
--- a/xdeadzone.c
+++ b/xdeadzone.c
@@ -27,6 +27,8 @@
 #  define DBG(x)
 #endif
 
+enum { M_UNSET, M_ABS, M_NE, M_NW, M_SE, M_SW };
+
 const char *exe_name;
 
 void set_exe_name(const char *p) {
@@ -45,7 +47,7 @@ void usage(const int ret) {
 	banner();
 	printf(
 			"Usage:\n  %s "
-			"[-nw | -ne | -sw | -se | -abs] <geometry>\n\n"
+			"<[-b | -w | -i]> [-nw | -ne | -sw | -se | -abs] <geometry>\n\n"
 			"  <geometry> is WxH for all modes but -abs, or\n  WxH[+-]xpos[+-]ypos for -abs\n",
 			exe_name);
 	exit(ret);
@@ -68,62 +70,72 @@ int main(int argc, char **argv) {
 	XWindowAttributes attr;
 	XSetWindowAttributes setattr;
 
-	int x = -1, y = -1, gflags, visible = 0, black = 0;
+	int x = -1, y = -1, gflags = -1, visible = 0, black = 0, mode = M_UNSET;
 	unsigned int width, height;
 
 	set_exe_name(argv[0]);
 
-	if(argc == 2) {
-	  	if(streq(argv[1], "--help")) {
+	while(*++argv) {
+		const char *a = *argv;
+		DBG(printf("arg: %s\n", a));
+
+	  	if(streq(a, "--help")) {
 			usage(0);
-		} else if(streq(argv[1], "--version")) {
+		} else if(streq(a, "--version")) {
 			banner();
 			exit(0);
-		}
-	}
-
-	if(argc >= 2) {
-		if(streq(argv[1], "-b")) {
+		} else if(streq(a, "-b")) {
 			visible = 1;
 			black = 1;
-			argv++;
-			argc--;
-		} else if(streq(argv[1], "-w")) {
+		} else if(streq(a, "-w")) {
 			visible = 1;
 			black = 0;
-			argv++;
-			argc--;
-		} else if(streq(argv[1], "-i")) {
+		} else if(streq(a, "-i")) {
 			visible = 0;
-			argv++;
-			argc--;
+		} else if(streq(a, "-abs")) {
+			mode = M_ABS;
+		} else if(streq(a, "-ne")) {
+			mode = M_NE;
+		} else if(streq(a, "-nw")) {
+			mode = M_NW;
+		} else if(streq(a, "-se")) {
+			mode = M_SE;
+		} else if(streq(a, "-sw")) {
+			mode = M_SW;
+		} else if(a[0] == '-') {
+			fprintf(stderr, "%s: invalid option: %s (try --help)\n", exe_name, a);
+			exit(1);
+		} else { /* no dash, must be geometry */
+			if(gflags == -1)
+				gflags = XParseGeometry(a, &x, &y, &width, &height);
+			else
+				errmsg("multiple geometry arguments given (try --help)");
 		}
 	}
 
-	if(argc != 3)
-		errmsg("wrong number of arguments (try --help)");
-
-	gflags = XParseGeometry(argv[2], &x, &y, &width, &height);
-	if(!(gflags & (WidthValue | HeightValue)))
-		errmsg("bad geometry (can't parse width and height)");
-
-	if(streq(argv[1], "-abs")) {
-		if(!(gflags & (XValue | YValue)))
-			errmsg("bad geometry: -abs requires X and Y coords");
-	} else {
-		if(gflags & (XValue | YValue))
-			errmsg("bad geometry: don't give X and Y coords with -nw/-ne/-sw/-se");
-		if(streq(argv[1], "-nw")) {
-			x = 0; y = 0;
-		} else if(streq(argv[1], "-ne")) {
-			x = -width; y = 0;
-		} else if(streq(argv[1], "-sw")) {
-			x = 0; y = -height;
-		} else if(streq(argv[1], "-se")) {
-			x = -width; y = -height;
-		} else {
-			errmsg("bad first argument (not -abs/-nw/-ne/-sw/-se)");
-		}
+	if(gflags == -1)
+		errmsg("missing required geometry argument (try --help)");
+	else
+		DBG(printf("XParseGeometry got %d %d %d %d\n", x, y, width, height));
+
+	if(mode != M_ABS && (gflags & (XValue | YValue)))
+		errmsg("bad geometry: X and Y position not allowed without -abs");
+
+	switch(mode) {
+		case M_ABS:
+			if(!(gflags & (XValue | YValue)))
+				errmsg("bad geometry: -abs requires X and Y position");
+			break;
+		case M_NW:
+			x = 0; y = 0; break;
+		case M_NE:
+			x = -width; y = 0; break;
+		case M_SW:
+			x = 0; y = -height; break;
+		case M_SE:
+			x = -width; y = -height; break;
+		default:
+			errmsg("no mode given, one of -abs -ne -nw -se -sw is required");
 	}
 
 	if(width == 0 || height == 0)
@@ -133,8 +145,13 @@ int main(int argc, char **argv) {
 		errmsg("can't open X display");
 
 	XGetWindowAttributes(d, DefaultRootWindow(d), &attr);
-	if(gflags & XNegative) x = (attr.width  + x) - width;
-	if(gflags & YNegative) y = (attr.height + y) - height;
+	if(mode == M_ABS) {
+		if(gflags & XNegative) x = (attr.width  + x) - width;
+		if(gflags & YNegative) y = (attr.height + y) - height;
+	} else {
+		if(x < 0) x = (attr.width  + x);
+		if(y < 0) y = (attr.height + y);
+	}
 
 	DBG(printf("X size %d x %d, x %d, y %d, width %d, height %d\n",
 				attr.width, attr.height, x, y, width, height));
@@ -190,6 +207,7 @@ int main(int argc, char **argv) {
 	  	ignored the x and y in the XCreateWindow(). */
 	XMoveWindow(d, w, x, y);
 
+	DBG(printf("awaiting EnterNotify events...\n"));
 	while(1) {
 		XNextEvent(d, &ev);
 		if(ev.type == EnterNotify) {
-- 
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