Add a -l (loop) option to retry until failure

Pretty remedial option parsing here, the order is significant

src/xpdev/sopenfile.c

@@ -7,11 +7,13 @@ int main(int argc, char** argv)
 	int access = O_RDWR;
 	char* share = "NWA";
 	bool try_all = true;
+	bool loop = false;
 
 	if(argc < 2) {
-		printf("usage: sopenfile [-r] <path/filename> [share-mode]\n");
+		printf("usage: sopenfile [-r] [-l] <path/filename> [share-mode]\n");
 		printf("\n");
 		printf("-r           open file read-only instead of read/write\n");
+		printf("-l           loop until failure\n");
 		printf("\n");
 		printf("share-mode:  N (deny-none)\n");
 		printf("             W (deny-write)\n");
@@ -23,12 +25,17 @@ int main(int argc, char** argv)
 		access = O_RDONLY;
 		++argn;
 	}
+	if(strcmp(argv[argn], "-l") == 0) {
+		loop = true;
+		++argn;
+	}
 	const char* path = argv[argn++];
 	if(argc > argn) {
 		share = argv[argn++];
 		try_all = false;
 	}
 
+	do {
 		for(int i = 0; share[i] != '\0'; ++i) {
 			int share_mode = 0;
 			char share_flag = share[i];
@@ -59,6 +66,7 @@ int main(int argc, char** argv)
 				close(file);
 			}
 		}
-	return EXIT_SUCCESS;
+	} while(loop && errno == 0);
+	return errno == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 }