The `[0,INT_MAX)` time check allows NaN through

[jpdoyle]

$ ./snore 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d-10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d
00d 00h 00m 00.000s

If you add printf("%f\n",tm); after https://github.com/clamiax/snore/blob/caad43cde564123b541df3cb2652df55937ac45f/snore.c#L118 you can observe that the number is NaN:

$ ./snore 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d-10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d
-nan
00d 00h 00m 00.000s

This ends up being accidentally safe because all comparisons involving NaN are false, so tm < endtm is false and the loop is never entered. However, if the loop is ever executed, this would invoke undefined behavior, as demonstrated if you run with ubsan on the branch https://github.com/jpdoyle/snore/tree/nan-unsafety:

$ ./snore 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d-10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d
-nan
snore.c:98:6: runtime error: store to null pointer of type 'char'

[bitsmanent]

Feel free to send a PR to fix the issue otherwise I will give a look later today.

[bitsmanent]

Fixed in ad68ede