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use cleaner code for handling float rounding in vfprintf

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CONCAT(0x1p,LDBL_MANT_DIG) is not safe outside of libc,
use 2/LDBL_EPSILON instead.

fix was proposed by Morten Welinder.
This commit is contained in:
Szabolcs Nagy 2014-05-30 17:09:53 +02:00 committed by Rich Felker
parent c350468658
commit bff6095d91
1 changed files with 1 additions and 3 deletions
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4
src/stdio/vfprintf.c
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@ -13,8 +13,6 @@
#define MAX(a,b) ((a)>(b) ? (a) : (b)) #define MAX(a,b) ((a)>(b) ? (a) : (b))
#define MIN(a,b) ((a)<(b) ? (a) : (b)) #define MIN(a,b) ((a)<(b) ? (a) : (b))
#define CONCAT2(x,y) x ## y
#define CONCAT(x,y) CONCAT2(x,y)
/* Convenient bit representation for modifier flags, which all fall /* Convenient bit representation for modifier flags, which all fall
* within 31 codepoints of the space character. */ * within 31 codepoints of the space character. */
@ -343,7 +341,7 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
x = *d % i; x = *d % i;
/* Are there any significant digits past j? */ /* Are there any significant digits past j? */
if (x || d+1!=z) { if (x || d+1!=z) {
long double round = CONCAT(0x1p,LDBL_MANT_DIG); long double round = 2/LDBL_EPSILON;
long double small; long double small;
if (*d/i & 1) round += 2; if (*d/i & 1) round += 2;
if (x<i/2) small=0x0.8p0; if (x<i/2) small=0x0.8p0;