1 files changed, 113 insertions, 0 deletions
diff --git a/StdLib/LibC/gdtoa/ldtoa.c b/StdLib/LibC/gdtoa/ldtoa.c
new file mode 100644
index 0000000000..8e38b624e4
--- /dev/null
+++ b/StdLib/LibC/gdtoa/ldtoa.c
@@ -0,0 +1,113 @@
+/*  $NetBSD: ldtoa.c,v 1.4.2.1 2007/05/07 19:49:06 pavel Exp $  */
+
+/*-
+ * Copyright (c) 2003 David Schultz <das@FreeBSD.ORG>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include  <LibConfig.h>
+#include <sys/EfiCdefs.h>
+
+#include <float.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <math.h>
+#include <stdlib.h>
+#include <machine/ieee.h>
+#include "gdtoaimp.h"
+
+#if defined(_MSC_VER)
+  /*  Disable warnings about conversions to narrower data types,
+      primarily for the fpclassify() macro.
+  */
+  #pragma warning ( disable : 4244 )
+  // Squelch bogus warnings about uninitialized variable use.
+  #pragma warning ( disable : 4700 )
+#endif
+
+/*
+ * ldtoa() is a wrapper for gdtoa() that makes it smell like dtoa(),
+ * except that the floating point argument is passed by reference.
+ * When dtoa() is passed a NaN or infinity, it sets expt to 9999.
+ * However, a long double could have a valid exponent of 9999, so we
+ * use INT_MAX in ldtoa() instead.
+ */
+char *
+ldtoa(long double *ld, int mode, int ndigits, int *decpt, int *sign, char **rve)
+{
+#ifdef EXT_EXPBITS
+  static FPI fpi = {
+    LDBL_MANT_DIG,      /* nbits */
+    LDBL_MIN_EXP - LDBL_MANT_DIG, /* emin */
+    LDBL_MAX_EXP - LDBL_MANT_DIG, /* emax */
+    FPI_Round_near,           /* rounding */
+#ifdef Sudden_Underflow /* unused, but correct anyway */
+    1
+#else
+    0
+#endif
+  };
+  int be, kind;
+  char *ret;
+  union ieee_ext_u u;
+  uint32_t bits[(LDBL_MANT_DIG + 31) / 32];
+
+  u.extu_ld = *ld;
+  *sign = (int)(u.extu_ext.ext_sign);
+  be = (int)(u.extu_ext.ext_exp - (LDBL_MAX_EXP - 1) - (LDBL_MANT_DIG - 1));
+  EXT_TO_ARRAY32(u, bits);
+
+  switch (fpclassify(u.extu_ld)) {
+  case FP_NORMAL:
+    kind = STRTOG_Normal;
+#ifdef  LDBL_IMPLICIT_NBIT
+    bits[LDBL_MANT_DIG / 32] |= 1 << ((LDBL_MANT_DIG - 1) % 32);
+#endif /* LDBL_IMPLICIT_NBIT */
+    break;
+  case FP_ZERO:
+    kind = STRTOG_Zero;
+    break;
+  case FP_SUBNORMAL:
+    kind = STRTOG_Denormal;
+#ifdef  LDBL_IMPLICIT_NBIT
+    be++;
+#endif
+    break;
+  case FP_INFINITE:
+    kind = STRTOG_Infinite;
+    break;
+  case FP_NAN:
+    kind = STRTOG_NaN;
+    break;
+  default:
+    abort();
+  }
+
+  ret = gdtoa(&fpi, be, (ULong *)bits, &kind, mode, ndigits, decpt, rve);
+  if (*decpt == -32768)
+    *decpt = INT_MAX;
+  return ret;
+#else
+  return dtoa((double)*ld, mode, ndigits, decpt, sign, rve);
+#endif
+}