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Merge latest dtoa.c [Bug #13545]

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Apply some part of http://www.netlib.org/fp/dtoa.c with my eyes...

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58796 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
naruse 2017-05-19 14:14:52 +00:00
parent a4d51619e9
commit 7be47caa88
2 changed files with 9 additions and 5 deletions
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12
util.c
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@ -2117,7 +2117,7 @@ break2:
for (nd = nf = 0; (c = *s) >= '0' && c <= '9'; nd++, s++)
if (nd < 9)
y = 10*y + c - '0';
else if (nd < 16)
else if (nd < DBL_DIG + 2)
z = 10*z + c - '0';
nd0 = nd;
#ifdef USE_LOCALE
@ -2157,17 +2157,19 @@ break2:
for (; c >= '0' && c <= '9'; c = *++s) {
have_dig:
nz++;
if (nd > DBL_DIG * 4) continue;
if (nd > DBL_DIG * 4) {
continue;
}
if (c -= '0') {
nf += nz;
for (i = 1; i < nz; i++)
if (nd++ < 9)
y *= 10;
else if (nd <= DBL_DIG + 1)
else if (nd <= DBL_DIG + 2)
z *= 10;
if (nd++ < 9)
y = 10*y + c;
else if (nd <= DBL_DIG + 1)
else if (nd <= DBL_DIG + 2)
z = 10*z + c;
nz = 0;
}
@ -2255,7 +2257,7 @@ ret0:
if (!nd0)
nd0 = nd;
k = nd < DBL_DIG + 1 ? nd : DBL_DIG + 1;
k = nd < DBL_DIG + 2 ? nd : DBL_DIG + 2;
dval(rv) = y;
if (k > 9) {
#ifdef SET_INEXACT