airdrop scan: Add --timeout

This timeout will default to 30 seconds.

Makefile

@@ -11,7 +11,7 @@ NO_AIRPLANE ?= 0
 CFLAGS += -DNO_CELLULAR=$(NO_CELLULAR) -DNO_WIFI=$(NO_WIFI) -DNO_AIRDROP=$(NO_AIRDROP) -DNO_AIRPLANE=$(NO_AIRPLANE)
 
 SRC := netctl.c
-SRC += utils/output.m
+SRC += utils/output.m utils/strtonum.c
 ifneq ($(NO_CELLULAR),1)
 SRC += cellular/cellular.m
 LIBS += -framework CoreTelephony

airdrop/airdrop-scan.m

@@ -24,6 +24,27 @@ void airdropBrowserCallBack(SFBrowserRef browser, SFNodeRef node, CFStringRef pr
 }
 
 int airdropscan(int argc, char **argv) {
+	int ch, index;
+	int timeout = 30;
+	const char *errstr;
+
+	struct option opts[] = {
+		{ "timeout", required_argument, 0, 't' },
+		{ NULL, 0, NULL, 0 }
+	};
+
+	while ((ch = getopt_long(argc, argv, "t:", opts, &index)) != -1) {
+		switch (ch) {
+			case 't':
+				timeout = strtonum(optarg, 0, INT_MAX, &errstr);
+				if (errstr != NULL)
+					err(1, "%s", optarg);
+				break;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
 	discovered = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
 	SFBrowserRef browser = SFBrowserCreate(kCFAllocatorDefault, kSFBrowserKindAirDrop);
 	SFBrowserSetDispatchQueue(browser, dispatch_get_main_queue());
@@ -32,7 +53,7 @@ int airdropscan(int argc, char **argv) {
 	SFBrowserSetClient(browser, airdropBrowserCallBack, &context);
 	SFBrowserOpenNode(browser, 0, 0, 0);
 
-	CFRunLoopRun();
+	CFRunLoopRunInMode(kCFRunLoopDefaultMode, timeout, false);
 
 	CFRelease(discovered);
 	SFBrowserInvalidate(browser);

utils/strtonum.c

@@ -0,0 +1,64 @@
+/*-
+ * Copyright (c) 2004 Ted Unangst and Todd Miller
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ *	$OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#define INVALID 1
+#define TOOSMALL 2
+#define TOOLARGE 3
+
+long long strtonum(const char *numstr, long long minval, long long maxval,
+				   const char **errstrp) {
+	long long ll = 0;
+	int error = 0;
+	char *ep;
+	struct errval {
+		const char *errstr;
+		int err;
+	} ev[4] = {
+		{NULL, 0},
+		{"invalid", EINVAL},
+		{"too small", ERANGE},
+		{"too large", ERANGE},
+	};
+
+	ev[0].err = errno;
+	errno = 0;
+	if (minval > maxval) {
+		error = INVALID;
+	} else {
+		ll = strtoll(numstr, &ep, 10);
+		if (errno == EINVAL || numstr == ep || *ep != '\0')
+			error = INVALID;
+		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
+			error = TOOSMALL;
+		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
+			error = TOOLARGE;
+	}
+	if (errstrp != NULL) *errstrp = ev[error].errstr;
+	errno = ev[error].err;
+	if (error) ll = 0;
+
+	return (ll);
+}