[patch] usbdevs(8) use strtol(3) instead of atoi(3) for more predictable result

[Alexander Kuleshov <kuleshovmail%gmail.com@localhost>]

Hello everyone,

usbdevs(8) uses atoi(3) to convert a device address given from a
command line argument.
But atoi(3) will return - zero in a case of non-integer value and such
device will be used.
This is kind of unpredictable behaviour to use a device by 0 addr in a
case when wrong
address was given to usbdevs.

Here is the patch which replaces atoi(3) with strtol(3) and prints out
an error message
with EINVAL error code for such cases:

diff --git a/usr.sbin/usbdevs/usbdevs.c b/usr.sbin/usbdevs/usbdevs.c
index e8fe1e7e6f4..526c1eade38 100644
--- a/usr.sbin/usbdevs/usbdevs.c
+++ b/usr.sbin/usbdevs/usbdevs.c
@@ -372,11 +372,14 @@ main(int argc, char **argv)
     char *dev = NULL;
     int addr = -1;
     int ncont;
2+    char *ep;

     while ((ch = getopt(argc, argv, "a:df:v?")) != -1) {
         switch(ch) {
         case 'a':
-            addr = atoi(optarg);
+            addr = strtol(optarg, &ep, 10);
+            if (*ep != '\0' || addr < 0)
+                errx(EINVAL, "bad value for device address - %s", optarg);
             break;
         case 'd':
             showdevs++;

Any comments?

Thank you.