From e94d0692864ecf9522fd6a97610a47a2f718d3de Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Mon, 7 Apr 2014 13:50:05 -0400 Subject: fix printf rounding with %g for some corner case midpoints the subsequent rounding code assumes the end pointer (z) accurately reflects the end of significance in the decimal expansion, but for certain large integers, spurious trailing zero slots were left behind when applying the binary exponent. issue reported by Morten Welinder; the analysis of the cause was performed by nsz, who also proposed this change. --- src/stdio/vfprintf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c index 0be75498..f6e7f38d 100644 --- a/src/stdio/vfprintf.c +++ b/src/stdio/vfprintf.c @@ -308,8 +308,8 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t) *d = x % 1000000000; carry = x / 1000000000; } - if (!z[-1] && z>a) z--; if (carry) *--a = carry; + while (z>a && !z[-1]) z--; e2-=sh; } while (e2<0) { -- cgit v1.2.1