X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=numeric.c;h=b3355a4c54742ec62106642d19d584f9abebbb6d;hb=ac27d13b824657b726428f3a6a1d5b3a01df569e;hp=6720726cfbe28d7cb7ce966a83dd15afd14e621f;hpb=96a5add60f1f39d38341c09c11f0542e68f782b0;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/numeric.c b/numeric.c
index 6720726..b3355a4 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1,7 +1,7 @@
 /*    numeric.c
  *
- *    Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- *    2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
+ *    Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
+ *    2002, 2003, 2004, 2005, 2006, 2007, by Larry Wall and others
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -953,10 +953,9 @@ Perl_my_atof2(pTHX_ const char* orig, NV* value)
 	else if (!seen_dp && GROK_NUMERIC_RADIX(&s, send)) {
 	    seen_dp = 1;
 	    if (sig_digits > MAX_SIG_DIGITS) {
-		++s;
-		while (isDIGIT(*s)) {
+		do {
 		    ++s;
-		}
+		} while (isDIGIT(*s));
 		break;
 	    }
 	}
@@ -1024,6 +1023,38 @@ Perl_my_frexpl(long double x, int *e) {
 #endif
 
 /*
+=for apidoc Perl_signbit
+
+Return a non-zero integer if the sign bit on an NV is set, and 0 if
+it is not.  
+
+If Configure detects this system has a signbit() that will work with
+our NVs, then we just use it via the #define in perl.h.  Otherwise,
+fall back on this implementation.  As a first pass, this gets everything
+right except -0.0.  Alas, catching -0.0 is the main use for this function,
+so this is not too helpful yet.  Still, at least we have the scaffolding
+in place to support other systems, should that prove useful.
+
+
+Configure notes:  This function is called 'Perl_signbit' instead of a
+plain 'signbit' because it is easy to imagine a system having a signbit()
+function or macro that doesn't happen to work with our particular choice
+of NVs.  We shouldn't just re-#define signbit as Perl_signbit and expect
+the standard system headers to be happy.  Also, this is a no-context
+function (no pTHX_) because Perl_signbit() is usually re-#defined in
+perl.h as a simple macro call to the system's signbit().
+Users should just always call Perl_signbit().
+
+=cut
+*/
+#if !defined(HAS_SIGNBIT)
+int
+Perl_signbit(NV x) {
+    return (x < 0.0) ? 1 : 0;
+}
+#endif
+
+/*
  * Local variables:
  * c-indentation-style: bsd
  * c-basic-offset: 4