dlls/oleaut32/variant.h

   1 /*
   2  * Variant Inlines
   3  *
   4  * Copyright 2003 Jon Griffiths
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #define NONAMELESSUNION
  21 #define NONAMELESSSTRUCT
  22 #include "windef.h"
  23 #include "winerror.h"
  24 #include "objbase.h"
  25 #include "oleauto.h"
  26 #include <math.h>
  27
  28 /* Get just the type from a variant pointer */
  29 #define V_TYPE(v)  (V_VT((v)) & VT_TYPEMASK)
  30
  31 /* Flags set in V_VT, other than the actual type value */
  32 #define VT_EXTRA_TYPE (VT_VECTOR|VT_ARRAY|VT_BYREF|VT_RESERVED)
  33
  34 /* Get the extra flags from a variant pointer */
  35 #define V_EXTRA_TYPE(v) (V_VT((v)) & VT_EXTRA_TYPE)
  36
  37 extern const char* wine_vtypes[];
  38 #define debugstr_vt(v) (((v)&VT_TYPEMASK) <= VT_CLSID ? wine_vtypes[((v)&VT_TYPEMASK)] : \
  39   ((v)&VT_TYPEMASK) == VT_BSTR_BLOB ? "VT_BSTR_BLOB": "Invalid")
  40 #define debugstr_VT(v) (!(v) ? "(null)" : debugstr_vt(V_TYPE((v))))
  41
  42 extern const char* wine_vflags[];
  43 #define debugstr_vf(v) (wine_vflags[((v)&VT_EXTRA_TYPE)>>12])
  44 #define debugstr_VF(v) (!(v) ? "(null)" : debugstr_vf(V_EXTRA_TYPE(v)))
  45
  46 /* Size constraints */
  47 #define I1_MAX   0x7f
  48 #define I1_MIN   ((-I1_MAX)-1)
  49 #define UI1_MAX  0xff
  50 #define UI1_MIN  0
  51 #define I2_MAX   0x7fff
  52 #define I2_MIN   ((-I2_MAX)-1)
  53 #define UI2_MAX  0xffff
  54 #define UI2_MIN  0
  55 #define I4_MAX   0x7fffffff
  56 #define I4_MIN   ((-I4_MAX)-1)
  57 #define UI4_MAX  0xffffffff
  58 #define UI4_MIN  0
  59 #define I8_MAX   (((LONGLONG)I4_MAX << 32) | UI4_MAX)
  60 #define I8_MIN   ((-I8_MAX)-1)
  61 #define UI8_MAX  (((ULONGLONG)UI4_MAX << 32) | UI4_MAX)
  62 #define UI8_MIN  0
  63 #define DATE_MAX 2958465
  64 #define DATE_MIN -657434
  65 #define R4_MAX 3.402823567797336e38
  66 #define R4_MIN 1.40129846432481707e-45
  67 #define R8_MAX 1.79769313486231470e+308
  68 #define R8_MIN 4.94065645841246544e-324
  69
  70 /* Value of sign for a positive decimal number */
  71 #define DECIMAL_POS 0
  72
  73 /* Native headers don't change the union ordering for DECIMAL sign/scale (duh).
  74  * This means that the signscale member is only useful for setting both members to 0.
  75  * SIGNSCALE creates endian-correct values so that we can properly set both at once
  76  * to values other than 0.
  77  */
  78 #ifdef WORDS_BIGENDIAN
  79 #define SIGNSCALE(sign,scale) (((scale) << 8) | sign)
  80 #else
  81 #define SIGNSCALE(sign,scale) (((sign) << 8) | scale)
  82 #endif
  83
  84 /* Macros for getting at a DECIMAL's parts */
  85 #define DEC_SIGN(d)      ((d)->u.s.sign)
  86 #define DEC_SCALE(d)     ((d)->u.s.scale)
  87 #define DEC_SIGNSCALE(d) ((d)->u.signscale)
  88 #define DEC_HI32(d)      ((d)->Hi32)
  89 #define DEC_MID32(d)     ((d)->u1.s1.Mid32)
  90 #define DEC_LO32(d)      ((d)->u1.s1.Lo32)
  91 #define DEC_LO64(d)      ((d)->u1.Lo64)
  92
  93 #define DEC_MAX_SCALE    28 /* Maximum scale for a decimal */
  94
  95 /* Inline return type */
  96 #define RETTYP inline static HRESULT
  97
  98 /* Simple compiler cast from one type to another */
  99 #define SIMPLE(dest, src, func) RETTYP _##func(src in, dest* out) { \
 100   *out = in; return S_OK; }
 101
 102 /* Compiler cast where input cannot be negative */
 103 #define NEGTST(dest, src, func) RETTYP _##func(src in, dest* out) { \
 104   if (in < (src)0) return DISP_E_OVERFLOW; *out = in; return S_OK; }
 105
 106 /* Compiler cast where input cannot be > some number */
 107 #define POSTST(dest, src, func, tst) RETTYP _##func(src in, dest* out) { \
 108   if (in > (dest)tst) return DISP_E_OVERFLOW; *out = in; return S_OK; }
 109
 110 /* Compiler cast where input cannot be < some number or >= some other number */
 111 #define BOTHTST(dest, src, func, lo, hi) RETTYP _##func(src in, dest* out) { \
 112   if (in < (dest)lo || in > hi) return DISP_E_OVERFLOW; *out = in; return S_OK; }
 113
 114 /* Conversions from IDispatch use the same code */
 115 HRESULT VARIANT_FromDisp(IDispatch*,LCID,void*,VARTYPE);
 116 /* As do conversions from BSTR to numeric types */
 117 HRESULT VARIANT_NumberFromBstr(OLECHAR*,LCID,ULONG,void*,VARTYPE);
 118
 119 #define CY_MULTIPLIER   10000             /* 4 dp of precision */
 120 #define CY_MULTIPLIER_F 10000.0
 121 #define CY_HALF         (CY_MULTIPLIER/2) /* 0.5 */
 122 #define CY_HALF_F       (CY_MULTIPLIER_F/2.0)
 123
 124 /* I1 */
 125 POSTST(signed char, BYTE, VarI1FromUI1, I1_MAX);
 126 BOTHTST(signed char, SHORT, VarI1FromI2, I1_MIN, I1_MAX);
 127 BOTHTST(signed char, LONG, VarI1FromI4, I1_MIN, I1_MAX);
 128 #define _VarI1FromR4(flt,out) VarI1FromR8((double)flt,out)
 129 #define _VarI1FromR8 VarI1FromR8
 130 #define _VarI1FromCy VarI1FromCy
 131 #define _VarI1FromDate(dt,out) VarI1FromR8((double)dt,out)
 132 #define _VarI1FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_I1)
 133 #define _VarI1FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, (BYTE*)out, VT_I1)
 134 SIMPLE(signed char, VARIANT_BOOL, VarI1FromBool);
 135 POSTST(signed char, USHORT, VarI1FromUI2, I1_MAX);
 136 POSTST(signed char, ULONG, VarI1FromUI4, I1_MAX);
 137 #define _VarI1FromDec VarI1FromDec
 138 BOTHTST(signed char, LONG64, VarI1FromI8, I1_MIN, I1_MAX);
 139 POSTST(signed char, ULONG64, VarI1FromUI8, I1_MAX);
 140
 141 /* UI1 */
 142 BOTHTST(BYTE, SHORT, VarUI1FromI2, UI1_MIN, UI1_MAX);
 143 #define _VarUI1FromR4(flt,out) VarUI1FromR8((double)flt,out)
 144 #define _VarUI1FromR8 VarUI1FromR8
 145 #define _VarUI1FromCy VarUI1FromCy
 146 #define _VarUI1FromDate(dt,out) VarUI1FromR8((double)dt,out)
 147 #define _VarUI1FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_UI1)
 148 #define _VarUI1FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_UI1)
 149 SIMPLE(BYTE, VARIANT_BOOL, VarUI1FromBool);
 150 NEGTST(BYTE, signed char, VarUI1FromI1);
 151 POSTST(BYTE, USHORT, VarUI1FromUI2, UI1_MAX);
 152 BOTHTST(BYTE, LONG, VarUI1FromI4, UI1_MIN, UI1_MAX);
 153 POSTST(BYTE, ULONG, VarUI1FromUI4, UI1_MAX);
 154 #define _VarUI1FromDec VarUI1FromDec
 155 BOTHTST(BYTE, LONG64, VarUI1FromI8, UI1_MIN, UI1_MAX);
 156 POSTST(BYTE, ULONG64, VarUI1FromUI8, UI1_MAX);
 157
 158 /* I2 */
 159 SIMPLE(SHORT, BYTE, VarI2FromUI1);
 160 BOTHTST(SHORT, LONG, VarI2FromI4, I2_MIN, I2_MAX);
 161 #define _VarI2FromR4(flt,out) VarI2FromR8((double)flt,out)
 162 #define _VarI2FromR8 VarI2FromR8
 163 #define _VarI2FromCy VarI2FromCy
 164 #define _VarI2FromDate(dt,out) VarI2FromR8((double)dt,out)
 165 #define _VarI2FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_I2)
 166 #define _VarI2FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, (BYTE*)out, VT_I2)
 167 SIMPLE(SHORT, VARIANT_BOOL, VarI2FromBool);
 168 SIMPLE(SHORT, signed char, VarI2FromI1);
 169 POSTST(SHORT, USHORT, VarI2FromUI2, I2_MAX);
 170 POSTST(SHORT, ULONG, VarI2FromUI4, I2_MAX);
 171 #define _VarI2FromDec VarI2FromDec
 172 BOTHTST(SHORT, LONG64, VarI2FromI8, I2_MIN, I2_MAX);
 173 POSTST(SHORT, ULONG64, VarI2FromUI8, I2_MAX);
 174
 175 /* UI2 */
 176 SIMPLE(USHORT, BYTE, VarUI2FromUI1);
 177 NEGTST(USHORT, SHORT, VarUI2FromI2);
 178 BOTHTST(USHORT, LONG, VarUI2FromI4, UI2_MIN, UI2_MAX);
 179 #define _VarUI2FromR4(flt,out) VarUI2FromR8((double)flt,out)
 180 #define _VarUI2FromR8 VarUI2FromR8
 181 #define _VarUI2FromCy VarUI2FromCy
 182 #define _VarUI2FromDate(dt,out) VarUI2FromR8((double)dt,out)
 183 #define _VarUI2FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_UI2)
 184 #define _VarUI2FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_UI2)
 185 SIMPLE(USHORT, VARIANT_BOOL, VarUI2FromBool);
 186 NEGTST(USHORT, signed char, VarUI2FromI1);
 187 POSTST(USHORT, ULONG, VarUI2FromUI4, UI2_MAX);
 188 #define _VarUI2FromDec VarUI2FromDec
 189 BOTHTST(USHORT, LONG64, VarUI2FromI8, UI2_MIN, UI2_MAX);
 190 POSTST(USHORT, ULONG64, VarUI2FromUI8, UI2_MAX);
 191
 192 /* I4 */
 193 SIMPLE(LONG, BYTE, VarI4FromUI1);
 194 SIMPLE(LONG, SHORT, VarI4FromI2);
 195 #define _VarI4FromR4(flt,out) VarI4FromR8((double)flt,out)
 196 #define _VarI4FromR8 VarI4FromR8
 197 #define _VarI4FromCy VarI4FromCy
 198 #define _VarI4FromDate(dt,out) VarI4FromR8((double)dt,out)
 199 #define _VarI4FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_I4)
 200 #define _VarI4FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, (BYTE*)out, VT_I4)
 201 SIMPLE(LONG, VARIANT_BOOL, VarI4FromBool);
 202 SIMPLE(LONG, signed char, VarI4FromI1);
 203 SIMPLE(LONG, USHORT, VarI4FromUI2);
 204 POSTST(LONG, ULONG, VarI4FromUI4, I4_MAX);
 205 #define _VarI4FromDec VarI4FromDec
 206 BOTHTST(LONG, LONG64, VarI4FromI8, I4_MIN, I4_MAX);
 207 POSTST(LONG, ULONG64, VarI4FromUI8, I4_MAX);
 208
 209 /* UI4 */
 210 SIMPLE(ULONG, BYTE, VarUI4FromUI1);
 211 NEGTST(ULONG, SHORT, VarUI4FromI2);
 212 NEGTST(ULONG, LONG, VarUI4FromI4);
 213 #define _VarUI4FromR4(flt,out) VarUI4FromR8((double)flt,out)
 214 #define _VarUI4FromR8 VarUI4FromR8
 215 #define _VarUI4FromCy VarUI4FromCy
 216 #define _VarUI4FromDate(dt,out) VarUI4FromR8((double)dt,out)
 217 #define _VarUI4FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_UI4)
 218 #define _VarUI4FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_UI4)
 219 SIMPLE(ULONG, VARIANT_BOOL, VarUI4FromBool);
 220 NEGTST(ULONG, signed char, VarUI4FromI1);
 221 SIMPLE(ULONG, USHORT, VarUI4FromUI2);
 222 #define _VarUI4FromDec VarUI4FromDec
 223 BOTHTST(ULONG, LONG64, VarUI4FromI8, UI4_MIN, UI4_MAX);
 224 POSTST(ULONG, ULONG64, VarUI4FromUI8, UI4_MAX);
 225
 226 /* I8 */
 227 SIMPLE(LONG64, BYTE, VarI8FromUI1);
 228 SIMPLE(LONG64, SHORT, VarI8FromI2);
 229 #define _VarI8FromR4 VarI8FromR8
 230 #define _VarI8FromR8 VarI8FromR8
 231 #define _VarI8FromCy VarI8FromCy
 232 #define _VarI8FromDate(dt,out) VarI8FromR8((double)dt,out)
 233 #define _VarI8FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_I8)
 234 #define _VarI8FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_I8)
 235 #define _VarI8FromBool   _VarI8FromI2
 236 SIMPLE(LONG64, signed char, VarI8FromI1);
 237 SIMPLE(LONG64, USHORT, VarI8FromUI2);
 238 SIMPLE(LONG64, LONG, VarI8FromI4);
 239 SIMPLE(LONG64, ULONG, VarI8FromUI4);
 240 #define _VarI8FromDec VarI8FromDec
 241 POSTST(LONG64, ULONG64, VarI8FromUI8, I8_MAX);
 242
 243 /* UI8 */
 244 SIMPLE(ULONG64, BYTE, VarUI8FromUI1);
 245 NEGTST(ULONG64, SHORT, VarUI8FromI2);
 246 #define _VarUI8FromR4 VarUI8FromR8
 247 #define _VarUI8FromR8 VarUI8FromR8
 248 #define _VarUI8FromCy VarUI8FromCy
 249 #define _VarUI8FromDate(dt,out) VarUI8FromR8((double)dt,out)
 250 #define _VarUI8FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_UI8)
 251 #define _VarUI8FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_UI8)
 252 #define _VarUI8FromBool _VarI8FromI2
 253 NEGTST(ULONG64, signed char, VarUI8FromI1);
 254 SIMPLE(ULONG64, USHORT, VarUI8FromUI2);
 255 NEGTST(ULONG64, LONG, VarUI8FromI4);
 256 SIMPLE(ULONG64, ULONG, VarUI8FromUI4);
 257 #define _VarUI8FromDec VarUI8FromDec
 258 NEGTST(ULONG64, LONG64, VarUI8FromI8);
 259
 260 /* R4 (float) */
 261 SIMPLE(float, BYTE, VarR4FromUI1);
 262 SIMPLE(float, SHORT, VarR4FromI2);
 263 RETTYP _VarR4FromR8(double i, float* o) {
 264   double d = i < 0.0 ? -i : i;
 265   if (d > R4_MAX) return DISP_E_OVERFLOW;
 266   *o = i;
 267   return S_OK;
 268 }
 269 RETTYP _VarR4FromCy(CY i, float* o) { *o = (double)i.int64 / CY_MULTIPLIER_F; return S_OK; }
 270 #define _VarR4FromDate(dt,out) _VarR4FromR8((double)dt,out)
 271 #define _VarR4FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_R4)
 272 #define _VarR4FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_R4)
 273 #define _VarR4FromBool _VarR4FromI2
 274 SIMPLE(float, signed char, VarR4FromI1);
 275 SIMPLE(float, USHORT, VarR4FromUI2);
 276 SIMPLE(float, LONG, VarR4FromI4);
 277 SIMPLE(float, ULONG, VarR4FromUI4);
 278 #define _VarR4FromDec VarR4FromDec
 279 SIMPLE(float, LONG64, VarR4FromI8);
 280 SIMPLE(float, ULONG64, VarR4FromUI8);
 281
 282 /* R8 (double) */
 283 SIMPLE(double, BYTE, VarR8FromUI1);
 284 SIMPLE(double, SHORT, VarR8FromI2);
 285 SIMPLE(double, float, VarR8FromR4);
 286 RETTYP _VarR8FromCy(CY i, double* o) { *o = (double)i.int64 / CY_MULTIPLIER_F; return S_OK; }
 287 SIMPLE(double, DATE, VarR8FromDate);
 288 #define _VarR8FromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_R8)
 289 #define _VarR8FromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_R8)
 290 #define _VarR8FromBool _VarR8FromI2
 291 SIMPLE(double, signed char, VarR8FromI1);
 292 SIMPLE(double, USHORT, VarR8FromUI2);
 293 SIMPLE(double, LONG, VarR8FromI4);
 294 SIMPLE(double, ULONG, VarR8FromUI4);
 295 #define _VarR8FromDec VarR8FromDec
 296 SIMPLE(double, LONG64, VarR8FromI8);
 297 SIMPLE(double, ULONG64, VarR8FromUI8);
 298
 299 /* BOOL */
 300 #define BOOLFUNC(src, func) RETTYP _##func(src in, VARIANT_BOOL* out) { \
 301   *out = in ? VARIANT_TRUE : VARIANT_FALSE; return S_OK; }
 302
 303 BOOLFUNC(signed char,VarBoolFromI1);
 304 BOOLFUNC(BYTE,VarBoolFromUI1);
 305 BOOLFUNC(SHORT,VarBoolFromI2);
 306 BOOLFUNC(USHORT,VarBoolFromUI2);
 307 BOOLFUNC(LONG,VarBoolFromI4);
 308 BOOLFUNC(ULONG,VarBoolFromUI4);
 309 BOOLFUNC(LONG64,VarBoolFromI8);
 310 BOOLFUNC(ULONG64,VarBoolFromUI8);
 311 #define _VarBoolFromR4(flt,out) _VarBoolFromR8((double)flt,out)
 312 BOOLFUNC(double,VarBoolFromR8);
 313 #define _VarBoolFromCy(i,o) _VarBoolFromI8(i.int64,o)
 314 #define _VarBoolFromDate(dt,out) _VarBoolFromR8((double)dt,out)
 315 #define _VarBoolFromStr VarBoolFromStr
 316 #define _VarBoolFromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, (BYTE*)out, VT_BOOL)
 317 #define _VarBoolFromDec VarBoolFromDec
 318
 319 /* Internal flags for low level conversion functions */
 320 #define  VAR_BOOLONOFF 0x0400 /* Convert bool to "On"/"Off" */
 321 #define  VAR_BOOLYESNO 0x0800 /* Convert bool to "Yes"/"No" */
 322 #define  VAR_NEGATIVE  0x1000 /* Number is negative */
 323
 324 /* DECIMAL */
 325 #define _VarDecFromUI1 VarDecFromUI4
 326 #define _VarDecFromI2 VarDecFromI4
 327 #define _VarDecFromR4 VarDecFromR4
 328 #define _VarDecFromR8 VarDecFromR8
 329 #define _VarDecFromCy VarDecFromCy
 330 #define _VarDecFromDate(dt,out) VarDecFromR8((double)dt,out)
 331 #define _VarDecFromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_DECIMAL)
 332 #define _VarDecFromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_DECIMAL)
 333 #define _VarDecFromBool VarDecFromBool
 334 #define _VarDecFromI1 VarDecFromI4
 335 #define _VarDecFromUI2 VarDecFromUI4
 336 #define _VarDecFromI4 VarDecFromI4
 337 #define _VarDecFromUI4 VarDecFromUI4
 338 #define _VarDecFromI8 VarDecFromI8
 339 #define _VarDecFromUI8 VarDecFromUI8
 340
 341 /* CY (Currency) */
 342 #define _VarCyFromUI1 VarCyFromR8
 343 #define _VarCyFromI2 VarCyFromR8
 344 #define _VarCyFromR4 VarCyFromR8
 345 #define _VarCyFromR8 VarCyFromR8
 346 #define _VarCyFromDate VarCyFromR8
 347 #define _VarCyFromStr(str,lcid,flags,out) VARIANT_NumberFromBstr(str,lcid,flags,(BYTE*)out,VT_CY)
 348 #define _VarCyFromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_CY)
 349 #define _VarCyFromBool VarCyFromR8
 350 #define _VarCyFromI1 VarCyFromR8
 351 #define _VarCyFromUI2 VarCyFromR8
 352 #define _VarCyFromI4 VarCyFromR8
 353 #define _VarCyFromUI4 VarCyFromR8
 354 #define _VarCyFromDec VarCyFromDec
 355 RETTYP _VarCyFromI8(LONG64 i, CY* o) {
 356   if (i <= (I8_MIN/CY_MULTIPLIER) || i >= (I8_MAX/CY_MULTIPLIER)) return DISP_E_OVERFLOW;
 357   o->int64 = i * CY_MULTIPLIER;
 358   return S_OK;
 359 }
 360 #define _VarCyFromUI8 VarCyFromR8
 361
 362 /* DATE */
 363 #define _VarDateFromUI1 _VarR8FromUI1
 364 #define _VarDateFromI2 _VarR8FromI2
 365 #define _VarDateFromR4 _VarDateFromR8
 366 RETTYP _VarDateFromR8(double i, DATE* o) {
 367   if (i <= (DATE_MIN - 1.0) || i >= (DATE_MAX + 1.0)) return DISP_E_OVERFLOW;
 368   *o = (DATE)i;
 369   return S_OK;
 370 }
 371 #define _VarDateFromCy _VarR8FromCy
 372 #define _VarDateFromStr VarDateFromStr
 373 #define _VarDateFromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_DATE)
 374 #define _VarDateFromBool _VarR8FromBool
 375 #define _VarDateFromI1 _VarR8FromI1
 376 #define _VarDateFromUI2 _VarR8FromUI2
 377 #define _VarDateFromI4 _VarDateFromR8
 378 #define _VarDateFromUI4 _VarDateFromR8
 379 #define _VarDateFromDec _VarR8FromDec
 380 RETTYP _VarDateFromI8(LONG64 i, DATE* o) {
 381   if (i < DATE_MIN || i > DATE_MAX) return DISP_E_OVERFLOW;
 382   *o = (DATE)i;
 383   return S_OK;
 384 }
 385 RETTYP _VarDateFromUI8(ULONG64 i, DATE* o) {
 386   if (i > DATE_MAX) return DISP_E_OVERFLOW;
 387   *o = (DATE)i;
 388   return S_OK;
 389 }
 390
 391 /* BSTR */
 392 #define _VarBstrFromUI1 VarBstrFromUI4
 393 #define _VarBstrFromI2 VarBstrFromI4
 394 #define _VarBstrFromR4 VarBstrFromR8
 395 #define _VarBstrFromR8 VarBstrFromR8
 396 #define _VarBstrFromCy VarBstrFromCy
 397 #define _VarBstrFromDate VarBstrFromDate
 398 #define _VarBstrFromDisp(disp,lcid,out) VARIANT_FromDisp(disp, lcid, out, VT_BSTR)
 399 #define _VarBstrFromBool VarBstrFromBool
 400 #define _VarBstrFromI1 VarBstrFromI4
 401 #define _VarBstrFromUI2 VarBstrFromUI4
 402 #define _VarBstrFromI4 VarBstrFromI4
 403 #define _VarBstrFromUI4 VarBstrFromUI4
 404 #define _VarBstrFromDec VarBstrFromDec
 405 #define _VarBstrFromI8 VarBstrFromI8
 406 #define _VarBstrFromUI8 VarBstrFromUI8
 407
 408 /* Macro to inline conversion from a float or double to any integer type,
 409  * rounding according to the 'dutch' convention.
 410  */
 411 #define OLEAUT32_DutchRound(typ, value, res) do { \
 412   double whole = (double)value < 0 ? ceil((double)value) : floor((double)value); \
 413   double fract = (double)value - whole; \
 414   if (fract > 0.5) res = (typ)whole + (typ)1; \
 415   else if (fract == 0.5) { typ is_odd = (typ)whole & 1; res = whole + is_odd; } \
 416   else if (fract >= 0.0) res = (typ)whole; \
 417   else if (fract == -0.5) { typ is_odd = (typ)whole & 1; res = whole - is_odd; } \
 418   else if (fract > -0.5) res = (typ)whole; \
 419   else res = (typ)whole - (typ)1; \
 420 } while(0);
 421
 422 /* The localised characters that make up a valid number */
 423 typedef struct tagVARIANT_NUMBER_CHARS
 424 {
 425   WCHAR cNegativeSymbol;
 426   WCHAR cPositiveSymbol;
 427   WCHAR cDecimalPoint;
 428   WCHAR cDigitSeperator;
 429   WCHAR cCurrencyLocal;
 430   WCHAR cCurrencyLocal2;
 431   WCHAR cCurrencyDecimalPoint;
 432   WCHAR cCurrencyDigitSeperator;
 433 } VARIANT_NUMBER_CHARS;
 434
 435 void VARIANT_GetLocalisedNumberChars(VARIANT_NUMBER_CHARS*,LCID,DWORD);