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Fail an integer format expression with a NaN or out-of-range value, from

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someone in GitHub issue 5725.
This commit is contained in:
nicm
2026-10-12 10:53:59 +00:00
committed by tmux update bot
parent 7a2ea39a3e
commit 4caff240c8
1 changed files with 22 additions and 8 deletions
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30
format.c
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@@ -1,4 +1,4 @@
/* $OpenBSD: format.c,v 1.425 2026/10/05 10:59:37 nicm Exp $ */
/* $OpenBSD: format.c,v 1.426 2026/10/12 10:53:59 nicm Exp $ */
/*
* Copyright (c) 2011 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -5785,6 +5785,17 @@ format_loop_clients(struct format_expand_state *es, const char *fmt)
return (value);
}
/* Truncate a value to a long long, failing if it is NaN or out of range. */
static int
format_truncate_integer(double *v)
{
/* (double)LLONG_MAX is 2^63, which does not fit; -2^63 does. */
if (isnan(*v) || *v >= (double)LLONG_MAX || *v < (double)LLONG_MIN)
return (-1);
*v = (long long)*v;
return (0);
}
static char *
format_replace_expression(struct format_modifier *mexp,
struct format_expand_state *es, const char *copy)
@@ -5870,9 +5881,11 @@ format_replace_expression(struct format_modifier *mexp,
goto fail;
}
if (!use_fp) {
mleft = (long long)mleft;
mright = (long long)mright;
if (!use_fp &&
(format_truncate_integer(&mleft) != 0 ||
format_truncate_integer(&mright) != 0)) {
format_log(es, "expression side is out of range");
goto fail;
}
format_log(es, "expression left side is: %.*f", prec, mleft);
format_log(es, "expression right side is: %.*f", prec, mright);
@@ -5912,10 +5925,11 @@ format_replace_expression(struct format_modifier *mexp,
result = (mleft <= mright);
break;
}
if (use_fp)
xasprintf(&value, "%.*f", prec, result);
else
xasprintf(&value, "%.*f", prec, (double)(long long)result);
if (!use_fp && format_truncate_integer(&result) != 0) {
format_log(es, "expression result is out of range");
goto fail;
}
xasprintf(&value, "%.*f", prec, result);
format_log(es, "expression result is %s", value);
free(right);