From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Wed, 5 Dec 2018 00:21:59 +0000 (+0100)
Subject: bc: make 2^1000000 interruptible faster
X-Git-Tag: 1_30_0~306
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=f359e004b0ce4a5ac361f553c13e876123fd4ebb;p=oweals%2Fbusybox.git

bc: make 2^1000000 interruptible faster

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---

diff --git a/miscutils/bc.c b/miscutils/bc.c
index 866fa3027..b392b05a3 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -2039,6 +2039,11 @@ static BcStatus bc_num_p(BcNum *a, BcNum *b, BcNum *restrict c, size_t scale)
 		powrdx <<= 1;
 		s = bc_num_mul(&copy, &copy, &copy, powrdx);
 		if (s) goto err;
+		// It is too slow to handle ^C only after entire "2^1000000" completes
+		if (G_interrupt) {
+			s = BC_STATUS_FAILURE;
+			goto err;
+		}
 	}
 
 	bc_num_copy(c, &copy);
@@ -2054,6 +2059,11 @@ static BcStatus bc_num_p(BcNum *a, BcNum *b, BcNum *restrict c, size_t scale)
 			s = bc_num_mul(c, &copy, c, resrdx);
 			if (s) goto err;
 		}
+		// It is too slow to handle ^C only after entire "2^1000000" completes
+		if (G_interrupt) {
+			s = BC_STATUS_FAILURE;
+			goto err;
+		}
 	}
 
 	if (neg) {