Added -w cmdline option

README.md

@@ -28,8 +28,10 @@ check and change them, so that they fit your needs.
 
 Usage
 -----
-sxiv has no useful command line options yet, but they will be added in the next
-releases. Right now, it simply displays all files given on the command line.
+sxiv supports the following command-line options:
+
+    -w WIDTHxHEIGHT  set window width to WIDTH and height to HEIGHT
+                     (if HEIGHT is omitted, height is also set to WIDTH)
 
 Use the following keys to control sxiv:
 

options.c

@@ -29,7 +29,7 @@ options_t _options;
 const options_t *options = (const options_t*) &_options;
 
 void print_usage() {
-	printf("usage: sxiv [-hv] FILES...\n");
+	printf("usage: sxiv [-hv] [-w WIDTH[xHEIGHT]] FILES...\n");
 }
 
 void print_version() {
@@ -38,9 +38,13 @@ void print_version() {
 }
 
 void parse_options(int argc, char **argv) {
+	unsigned short w, h;
 	int opt;
 
-	while ((opt = getopt(argc, argv, "hv")) != -1) {
+	_options.winw = w = 0;
+	_options.winh = h = 0;
+
+	while ((opt = getopt(argc, argv, "hvw:")) != -1) {
 		switch (opt) {
 			case '?':
 				print_usage();
@@ -51,7 +55,24 @@ void parse_options(int argc, char **argv) {
 			case 'v':
 				print_version();
 				exit(0);
+			case 'w':
+				if (!sscanf(optarg, "%hux%hu", &w, &h)) {
+					fprintf(stderr, "sxiv: invalid argument for option -w: %s\n",
+					        optarg);
+					exit(1);
+				} else {
+					_options.winw = (int) w;
+					_options.winh = (int) h;
 				}
+				break;
+		}
+	}
+
+	if (!_options.winw) {
+		_options.winw = WIN_WIDTH;
+		_options.winh = WIN_HEIGHT;
+	} else if (!_options.winh) {
+		_options.winh = _options.winw;
 	}
 
 	_options.filenames = (const char**) argv + optind;

options.h

@@ -22,6 +22,8 @@
 typedef struct options_s {
 	const char **filenames;
 	int filecnt;
+	int winw;
+	int winh;
 } options_t;
 
 extern const options_t *options;

sxiv.1

@@ -4,6 +4,10 @@ sxiv \- Simple (or small or suckless) X Image Viewer
 .SH SYNOPSIS
 .B sxiv
 .RB [ \-hv ]
+[
+.B \-w
+.IB WIDTH x HEIGHT
+]
 .IR FILE ...
 .SH DESCRIPTION
 sxiv is a simple image viewer for X. It only has the most basic features
@@ -18,6 +22,16 @@ Print brief usage information to standard output and exit.
 .TP
 .B \-v
 Print version information to standard output and exit.
+.TP
+.BI "\-w " WIDTH x HEIGHT
+Set window width to
+.I WIDTH
+and height to
+.IR HEIGHT .
+If
+.I HEIGHT
+is omitted, height is also set to
+.IR WIDTH .
 .SH KEYBOARD COMMANDS
 .SS General
 .TP

window.c

@@ -23,6 +23,7 @@
 #include <X11/Xutil.h>
 
 #include "sxiv.h"
+#include "options.h"
 #include "window.h"
 
 GC bgc;
@@ -53,12 +54,8 @@ void win_open(win_t *win) {
 	win->bgcol = bgcol.pixel;
 	win->pm = 0;
 
-	win->w = WIN_WIDTH;
-	win->h = WIN_HEIGHT;
-	if (win->w > e->scrw)
-		win->w = e->scrw;
-	if (win->h > e->scrh)
-		win->h = e->scrh;
+	win->w = MIN(options->winw, e->scrw);
+	win->h = MIN(options->winh, e->scrh);
 	win->x = (e->scrw - win->w) / 2;
 	win->y = (e->scrh - win->h) / 2;