Make a var volatile, which forces a mem write at the right spot, and

detctecion of underflow where it would otherwise not  happen for FPUs
that have a larger register size than sizeof double (i386, m68k). ok
deraadt@ weingart@ kettenis@

1 files changed, 7 insertions, 2 deletions

diff --git a/src/lib/libc/stdlib/strtod.c b/src/lib/libc/stdlib/strtod.c
index d01158e10c..3081cb5cc7 100644
--- a/src/lib/libc/stdlib/strtod.c
+++ b/src/lib/libc/stdlib/strtod.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: strtod.c,v 1.22 2006/05/19 14:15:27 thib Exp $ */
+/*      $OpenBSD: strtod.c,v 1.23 2006/10/01 11:36:33 otto Exp $ */
 /****************************************************************
  *
  * The author of this software is David M. Gay.
@@ -1128,7 +1128,12 @@ strtod(CONST char *s00, char **se)
                  e, e1, esign, i, j, k, nd, nd0, nf, nz, nz0, sign;
         CONST char *s, *s0, *s1;
         double aadj, aadj1, adj;
-        _double rv, rv0;
+        /*
+         * volatile forces mem update for FPUs where reg size != sizeof double,
+         * which should trigger ERANGE in the case of underflow.
+         */
+        volatile _double rv;
+        _double rv0;
         Long L;
         ULong y, z;
         Bigint *bb, *bb1, *bd, *bd0, *bs, *delta;