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calendar(1): don't segfault in invalid input

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When the user supplies an invalid number of days provide a useful error message
instead of segfaulting.

PR:		bin/186697
Reported by:	kaltheat <kaltheat@gmail.com>
Submitted by:	oliver <oliver@beefrankly.org> (older version)
This commit is contained in:
Eitan Adler 2014-02-17 03:24:00 +00:00
parent 7e1a619d03
commit 81479c5c55
1 changed files with 4 additions and 0 deletions
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4
usr.bin/calendar/calendar.c
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@ -96,10 +96,14 @@ main(int argc, char *argv[])
case 'A': /* days after current date */
f_dayAfter = atoi(optarg);
if (f_dayAfter < 0)
errx(1, "number of days must be positive");
break;
case 'B': /* days before current date */
f_dayBefore = atoi(optarg);
if (f_dayBefore < 0)
errx(1, "number of days must be positive");
break;
case 'D': /* debug output of sun and moon info */