fix minor problem in previous strtod non-nearest rounding bug fix

commit 6ffdc4579ffb34f4aab69ab4c081badabc7c0a9a set lnz in the code
path for non-zero digits after a huge string of zeros, but the
assignment of dc to lnz truncates if the value of dc does not fit in
int; this is possible for some pathologically long inputs, either via
strings on 64-bit systems or via scanf-family functions.

instead, simply set lnz to match the point at which we add the
artificial trailing 1 bit to simulate nonzero digits after a huge
run of zeros.

diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index ae0985265edf09c02d6c338698305b1375a701db..278bf25025d64e1b6375e1b2a57ab5e2b3306246 100644 (file)
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -111,7 +111,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
                } else {
                        dc++;
                        if (c!='0') {
-                               lnz = dc;
+                               lnz = (KMAX-4)*9;
                                x[KMAX-4] |= 1;
                        }
                }