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Bail if increment is too small for the precision to avoid an infinite loop.

pull/36/head
mlelstv 2024-05-04 13:29:41 +00:00
parent 5b4135cd6f
commit c2c241e6a6
1 changed files with 10 additions and 1 deletions
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11
usr.bin/seq/seq.c
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@ -31,7 +31,7 @@
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 2005\
The NetBSD Foundation, Inc. All rights reserved.");
__RCSID("$NetBSD: seq.c,v 1.13 2024/02/24 10:10:04 mlelstv Exp $");
__RCSID("$NetBSD: seq.c,v 1.14 2024/05/04 13:29:41 mlelstv Exp $");
#endif /* not lint */
#include <ctype.h>
@ -105,6 +105,7 @@ main(int argc, char *argv[])
double first = 1.0;
double last = 0.0;
double incr = 0.0;
double prev;
struct lconv *locale;
char *fmt = NULL;
const char *sep = "\n";
@ -208,15 +209,23 @@ main(int argc, char *argv[])
if (incr > 0) {
printf(fmt, first);
prev = first;
for (first += incr; first <= last; first += incr) {
if (first <= prev)
errx(1, "increment too small\n");
fputs(sep, stdout);
printf(fmt, first);
prev = first;
}
} else {
printf(fmt, first);
prev = first;
for (first += incr; first >= last; first += incr) {
if (first >= prev)
errx(1, "increment too small\n");
fputs(sep, stdout);
printf(fmt, first);
prev = first;
}
}
if (term != NULL)