From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 11 Apr 2012 03:41:54 +0000 (-0400)
Subject: fix float scanning of certain values ending in zeros
X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=commitdiff_plain;h=38b3f1fea8fe4f2c590c1a9438d219291a7bfcd2

fix float scanning of certain values ending in zeros

for example, "1000000000" was being read as "1" due to this loop
exiting early. it's necessary to actually update z and zero the
entries so that the subsequent rounding code does not get confused;
before i did that, spurious inexact exceptions were being raised.
---

diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index ed735278..000706d7 100644
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -225,8 +225,10 @@ static long double decfloat(FILE *f, int bits, int emin, int sign, int pok)
 		}
 	}
 
-	for (y=i=0; i<LD_B1B_DIG && (a+i & MASK)!=z; i++)
+	for (y=i=0; i<LD_B1B_DIG; i++) {
+		if ((a+i & MASK)==z) x[z=(z+1 & MASK)] = 0;
 		y = 1000000000.0L * y + x[a+i & MASK];
+	}
 
 	y *= sign;