From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 erts/emulator/sys/win32/sys_float.c | 145 ++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 erts/emulator/sys/win32/sys_float.c

(limited to 'erts/emulator/sys/win32/sys_float.c')

diff --git a/erts/emulator/sys/win32/sys_float.c b/erts/emulator/sys/win32/sys_float.c
new file mode 100644
index 0000000000..9e67ca7f48
--- /dev/null
+++ b/erts/emulator/sys/win32/sys_float.c
@@ -0,0 +1,145 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 1997-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+/* Float conversions */
+
+#include "sys.h"
+#include "signal.h"
+
+/* global variable for floating point checks, (see sys.h) */
+/* Note! This is part of the interface Machine <---> sys.c */
+volatile int erl_fp_exception = 0;
+
+static void fpe_exception(int sig);
+
+void
+erts_sys_init_float(void)
+{
+}
+void erts_thread_init_float(void)
+{
+}
+void erts_thread_disable_fpe(void)
+{
+}
+
+/*
+ ** These two functions should maybe use localeconv() to pick up
+ ** the current radix character, but since it is uncertain how
+ ** expensive such a system call is, and since no-one has heard
+ ** of other radix characters than '.' and ',' an ad-hoc 
+ ** low execution time solution is used instead.
+ */
+
+int 
+sys_chars_to_double(char *buf, double *fp)
+{
+    char *s = buf, *t, *dp;
+    
+    /* Robert says that something like this is what he really wanted:
+     * (The [.,] radix test is NOT what Robert wanted - it was added later)
+     *
+     * 7 == sscanf(Tbuf, "%[+-]%[0-9][.,]%[0-9]%[eE]%[+-]%[0-9]%s", ....);
+     * if (*s2 == 0 || *s3 == 0 || *s4 == 0 || *s6 == 0 || *s7)
+     *   break;
+     */
+    
+    /* Scan string to check syntax. */
+    if (*s == '+' || *s == '-') s++;
+    if (!isdigit(*s))		/* Leading digits. */
+      return -1;
+    while (isdigit(*s)) s++;
+    if (*s != '.' && *s != ',')/* Decimal part. */
+      return -1;
+    dp = s++;			/* Remember decimal point pos just in case */
+    if (!isdigit(*s))
+      return -1;
+    while (isdigit(*s)) s++;
+    if (*s == 'e' || *s == 'E') {
+	/* There is an exponent. */
+	s++;
+	if (*s == '+' || *s == '-') s++;
+	if (!isdigit(*s))
+	  return -1;
+	while (isdigit(*s)) s++;
+    }
+    if (*s)			/* That should be it */
+      return -1;
+    
+    errno = 0;
+    *fp = strtod(buf, &t);
+    if (t != s) {		/* Whole string not scanned */
+	/* Try again with other radix char */
+	*dp = (*dp == '.') ? ',' : '.';
+	errno = 0;
+	*fp = strtod(buf, &t);
+	if (t != s) {		/* Whole string not scanned */
+	    return -1;
+	}
+    }
+    if (*fp < -1.0e-307 || 1.0e-307 < *fp) {
+	if (errno == ERANGE) {
+	    return -1;
+	}
+    } else {
+	if (errno == ERANGE) {
+	    /* Special case: Windows (at least some) regard very small 
+	     * i.e non-normalized numbers as a range error for strtod().
+	     * But not for atof. 
+	     */
+	    *fp = atof(buf);
+	}
+    }
+    
+    return 0;
+}
+
+/* 
+** Convert a double to ascii format 0.dddde[+|-]ddd
+** return number of characters converted
+*/
+
+int
+sys_double_to_chars(double fp, char *buf)
+{
+    char *s = buf;
+    
+    (void) sprintf(buf, "%.20e", fp);
+    /* Search upto decimal point */
+    if (*s == '+' || *s == '-') s++;
+    while (isdigit(*s)) s++;
+    if (*s == ',') *s++ = '.'; /* Replace ',' with '.' */
+    /* Scan to end of string */
+    while (*s) s++;
+    return s-buf; /* i.e strlen(buf) */
+}
+
+int
+matherr(struct _exception *exc)
+{
+    erl_fp_exception = 1;
+    DEBUGF(("FP exception (matherr) (0x%x) (%d)\n", exc->type, erl_fp_exception));
+    return 1;
+}
+
+static void
+fpe_exception(int sig)
+{
+    erl_fp_exception = 1;
+    DEBUGF(("FP exception\n"));
+}
-- 
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