Explicitly enable printing of warnings

README.md

@@ -35,6 +35,7 @@ sxiv supports the following command-line options:
     -p       pixelize, i.e. turn off image anti-aliasing
     -s       scale all images to fit into window
     -v       print version information and exit
+    -W       enable printing of warnings
     -w WIDTHxHEIGHT
              set window width to WIDTH and height to HEIGHT
              (if HEIGHT is omitted, height is also set to WIDTH)

image.c

@@ -23,7 +23,6 @@
 
 #include "sxiv.h"
 #include "image.h"
-#include "options.h"
 
 int zl_cnt;
 float zoom_min;

main.c

@@ -26,7 +26,6 @@
 
 #include "sxiv.h"
 #include "image.h"
-#include "options.h"
 #include "window.h"
 
 void on_keypress(XEvent*);

options.c

@@ -29,7 +29,7 @@ options_t _options;
 const options_t *options = (const options_t*) &_options;
 
 void print_usage() {
-	printf("usage: sxiv [-dfhpsvZ] [-w WIDTH[xHEIGHT]] [-z ZOOM] FILES...\n");
+	printf("usage: sxiv [-dfhpsvWZ] [-w WIDTH[xHEIGHT]] [-z ZOOM] FILES...\n");
 }
 
 void print_version() {
@@ -50,7 +50,9 @@ void parse_options(int argc, char **argv) {
 	_options.winh = h = 0;
 	_options.fullscreen = 0;
 
-	while ((opt = getopt(argc, argv, "dfhpsvw:Zz:")) != -1) {
+	_options.warn = 0;
+
+	while ((opt = getopt(argc, argv, "dfhpsvWw:Zz:")) != -1) {
 		switch (opt) {
 			case '?':
 				print_usage();
@@ -73,6 +75,9 @@ void parse_options(int argc, char **argv) {
 			case 'v':
 				print_version();
 				exit(0);
+			case 'W':
+				_options.warn = 1;
+				break;
 			case 'w':
 				if (!sscanf(optarg, "%hux%hu", &w, &h)) {
 					fprintf(stderr, "sxiv: invalid argument for option -w: %s\n",

options.h

@@ -32,6 +32,8 @@ typedef struct options_s {
 	int winw;
 	int winh;
 	unsigned char fullscreen;
+
+	unsigned char warn;
 } options_t;
 
 extern const options_t *options;

sxiv.1

@@ -3,7 +3,7 @@
 sxiv \- Simple (or small or suckless) X Image Viewer
 .SH SYNOPSIS
 .B sxiv
-.RB [ \-dfhpsvZ ]
+.RB [ \-dfhpsvWZ ]
 .RB [ \-w
 .IB WIDTH x HEIGHT
 ]
@@ -36,6 +36,9 @@ Scale all images to fit into window.
 .B \-v
 Print version information to standard output and exit.
 .TP
+.B \-W
+Enable printing of warnings to standard error stream.
+.TP
 .BI "\-w " WIDTH x HEIGHT
 Set window width to
 .I WIDTH

sxiv.h

@@ -20,6 +20,7 @@
 #define SXIV_H
 
 #include "config.h"
+#include "options.h"
 
 #define ABS(a)   ((a) < 0 ? (-(a)) : (a))
 #define MIN(a,b) ((a) < (b) ? (a) : (b))
@@ -27,9 +28,11 @@
 
 #define WARN(...)                                                    \
   do {                                                               \
+    if (options->warn) {                                             \
       fprintf(stderr, "sxiv: %s:%d: warning: ", __FILE__, __LINE__); \
       fprintf(stderr, __VA_ARGS__);                                  \
       fprintf(stderr, "\n");                                         \
+    }                                                                \
   } while (0)
 
 #define DIE(...)                                                     \

window.c

@@ -24,7 +24,6 @@
 #include <X11/cursorfont.h>
 
 #include "sxiv.h"
-#include "options.h"
 #include "window.h"
 
 static Cursor arrow;