glib/gtypes.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #ifndef __G_TYPES_H__
  28 #define __G_TYPES_H__
  29
  30 #include <glibconfig.h>
  31
  32 G_BEGIN_DECLS
  33
  34 /* Provide type definitions for commonly used types.
  35  *  These are useful because a "gint8" can be adjusted
  36  *  to be 1 byte (8 bits) on all platforms. Similarly and
  37  *  more importantly, "gint32" can be adjusted to be
  38  *  4 bytes (32 bits) on all platforms.
  39  */
  40
  41 typedef char   gchar;
  42 typedef short  gshort;
  43 typedef long   glong;
  44 typedef int    gint;
  45 typedef gint   gboolean;
  46
  47 typedef unsigned char   guchar;
  48 typedef unsigned short  gushort;
  49 typedef unsigned long   gulong;
  50 typedef unsigned int    guint;
  51
  52 typedef float   gfloat;
  53 typedef double  gdouble;
  54
  55 /* Define min and max constants for the fixed size numerical types */
  56 #define G_MININT8       ((gint8)  0x80)
  57 #define G_MAXINT8       ((gint8)  0x7f)
  58 #define G_MAXUINT8      ((guint8) 0xff)
  59
  60 #define G_MININT16      ((gint16)  0x8000)
  61 #define G_MAXINT16      ((gint16)  0x7fff)
  62 #define G_MAXUINT16     ((guint16) 0xffff)
  63
  64 #define G_MININT32      ((gint32)  0x80000000)
  65 #define G_MAXINT32      ((gint32)  0x7fffffff)
  66 #define G_MAXUINT32     ((guint32) 0xffffffff)
  67
  68 #define G_MININT64      ((gint64) G_GINT64_CONSTANT(0x8000000000000000))
  69 #define G_MAXINT64      G_GINT64_CONSTANT(0x7fffffffffffffff)
  70 #define G_MAXUINT64     G_GINT64_CONSTANT(0xffffffffffffffffU)
  71
  72 typedef void* gpointer;
  73 typedef const void *gconstpointer;
  74
  75 typedef gint            (*GCompareFunc)         (gconstpointer  a,
  76                                                  gconstpointer  b);
  77 typedef gint            (*GCompareDataFunc)     (gconstpointer  a,
  78                                                  gconstpointer  b,
  79                                                  gpointer       user_data);
  80 typedef gboolean        (*GEqualFunc)           (gconstpointer  a,
  81                                                  gconstpointer  b);
  82 typedef void            (*GDestroyNotify)       (gpointer       data);
  83 typedef void            (*GFunc)                (gpointer       data,
  84                                                  gpointer       user_data);
  85 typedef guint           (*GHashFunc)            (gconstpointer  key);
  86 typedef void            (*GHFunc)               (gpointer       key,
  87                                                  gpointer       value,
  88                                                  gpointer       user_data);
  89 typedef void            (*GFreeFunc)            (gpointer       data);
  90 typedef const gchar *   (*GTranslateFunc)       (const gchar   *str,
  91                                                  gpointer       data);
  92
  93
  94 /* Define some mathematical constants that aren't available
  95  * symbolically in some strict ISO C implementations.
  96  */
  97 #define G_E     2.7182818284590452353602874713526624977572470937000
  98 #define G_LN2   0.69314718055994530941723212145817656807550013436026
  99 #define G_LN10  2.3025850929940456840179914546843642076011014886288
 100 #define G_PI    3.1415926535897932384626433832795028841971693993751
 101 #define G_PI_2  1.5707963267948966192313216916397514420985846996876
 102 #define G_PI_4  0.78539816339744830961566084581987572104929234984378
 103 #define G_SQRT2 1.4142135623730950488016887242096980785696718753769
 104
 105 /* Portable endian checks and conversions
 106  *
 107  * glibconfig.h defines G_BYTE_ORDER which expands to one of
 108  * the below macros.
 109  */
 110 #define G_LITTLE_ENDIAN 1234
 111 #define G_BIG_ENDIAN    4321
 112 #define G_PDP_ENDIAN    3412            /* unused, need specific PDP check */
 113
 114
 115 /* Basic bit swapping functions
 116  */
 117 #define GUINT16_SWAP_LE_BE_CONSTANT(val)        ((guint16) ( \
 118     (guint16) ((guint16) (val) >> 8) |  \
 119     (guint16) ((guint16) (val) << 8)))
 120
 121 #define GUINT32_SWAP_LE_BE_CONSTANT(val)        ((guint32) ( \
 122     (((guint32) (val) & (guint32) 0x000000ffU) << 24) | \
 123     (((guint32) (val) & (guint32) 0x0000ff00U) <<  8) | \
 124     (((guint32) (val) & (guint32) 0x00ff0000U) >>  8) | \
 125     (((guint32) (val) & (guint32) 0xff000000U) >> 24)))
 126
 127 #define GUINT64_SWAP_LE_BE_CONSTANT(val)        ((guint64) ( \
 128       (((guint64) (val) &                                               \
 129         (guint64) G_GINT64_CONSTANT (0x00000000000000ffU)) << 56) |     \
 130       (((guint64) (val) &                                               \
 131         (guint64) G_GINT64_CONSTANT (0x000000000000ff00U)) << 40) |     \
 132       (((guint64) (val) &                                               \
 133         (guint64) G_GINT64_CONSTANT (0x0000000000ff0000U)) << 24) |     \
 134       (((guint64) (val) &                                               \
 135         (guint64) G_GINT64_CONSTANT (0x00000000ff000000U)) <<  8) |     \
 136       (((guint64) (val) &                                               \
 137         (guint64) G_GINT64_CONSTANT (0x000000ff00000000U)) >>  8) |     \
 138       (((guint64) (val) &                                               \
 139         (guint64) G_GINT64_CONSTANT (0x0000ff0000000000U)) >> 24) |     \
 140       (((guint64) (val) &                                               \
 141         (guint64) G_GINT64_CONSTANT (0x00ff000000000000U)) >> 40) |     \
 142       (((guint64) (val) &                                               \
 143         (guint64) G_GINT64_CONSTANT (0xff00000000000000U)) >> 56)))
 144
 145 /* Arch specific stuff for speed
 146  */
 147 #if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
 148 #  if defined (__i386__)
 149 #    define GUINT16_SWAP_LE_BE_IA32(val) \
 150        (__extension__                                           \
 151         ({ register guint16 __v, __x = ((guint16) (val));       \
 152            if (__builtin_constant_p (__x))                      \
 153              __v = GUINT16_SWAP_LE_BE_CONSTANT (__x);           \
 154            else                                                 \
 155              __asm__ ("rorw $8, %w0"                            \
 156                       : "=r" (__v)                              \
 157                       : "0" (__x)                               \
 158                       : "cc");                                  \
 159             __v; }))
 160 #    if !defined (__i486__) && !defined (__i586__) \
 161         && !defined (__pentium__) && !defined (__i686__) \
 162         && !defined (__pentiumpro__) && !defined (__pentium4__)
 163 #       define GUINT32_SWAP_LE_BE_IA32(val) \
 164           (__extension__                                        \
 165            ({ register guint32 __v, __x = ((guint32) (val));    \
 166               if (__builtin_constant_p (__x))                   \
 167                 __v = GUINT32_SWAP_LE_BE_CONSTANT (__x);        \
 168               else                                              \
 169                 __asm__ ("rorw $8, %w0\n\t"                     \
 170                          "rorl $16, %0\n\t"                     \
 171                          "rorw $8, %w0"                         \
 172                          : "=r" (__v)                           \
 173                          : "0" (__x)                            \
 174                          : "cc");                               \
 175               __v; }))
 176 #    else /* 486 and higher has bswap */
 177 #       define GUINT32_SWAP_LE_BE_IA32(val) \
 178           (__extension__                                        \
 179            ({ register guint32 __v, __x = ((guint32) (val));    \
 180               if (__builtin_constant_p (__x))                   \
 181                 __v = GUINT32_SWAP_LE_BE_CONSTANT (__x);        \
 182               else                                              \
 183                 __asm__ ("bswap %0"                             \
 184                          : "=r" (__v)                           \
 185                          : "0" (__x));                          \
 186               __v; }))
 187 #    endif /* processor specific 32-bit stuff */
 188 #    define GUINT64_SWAP_LE_BE_IA32(val) \
 189        (__extension__                                                   \
 190         ({ union { guint64 __ll;                                        \
 191                    guint32 __l[2]; } __w, __r;                          \
 192            __w.__ll = ((guint64) (val));                                \
 193            if (__builtin_constant_p (__w.__ll))                         \
 194              __r.__ll = GUINT64_SWAP_LE_BE_CONSTANT (__w.__ll);         \
 195            else                                                         \
 196              {                                                          \
 197                __r.__l[0] = GUINT32_SWAP_LE_BE (__w.__l[1]);            \
 198                __r.__l[1] = GUINT32_SWAP_LE_BE (__w.__l[0]);            \
 199              }                                                          \
 200            __r.__ll; }))
 201      /* Possibly just use the constant version and let gcc figure it out? */
 202 #    define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_IA32 (val))
 203 #    define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_IA32 (val))
 204 #    define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_IA32 (val))
 205 #  elif defined (__ia64__)
 206 #    define GUINT16_SWAP_LE_BE_IA64(val) \
 207        (__extension__                                           \
 208         ({ register guint16 __v, __x = ((guint16) (val));       \
 209            if (__builtin_constant_p (__x))                      \
 210              __v = GUINT16_SWAP_LE_BE_CONSTANT (__x);           \
 211            else                                                 \
 212              __asm__ __volatile__ ("shl %0 = %1, 48 ;;"         \
 213                                    "mux1 %0 = %0, @rev ;;"      \
 214                                     : "=r" (__v)                \
 215                                     : "r" (__x));               \
 216             __v; }))
 217 #    define GUINT32_SWAP_LE_BE_IA64(val) \
 218        (__extension__                                           \
 219          ({ register guint32 __v, __x = ((guint32) (val));      \
 220             if (__builtin_constant_p (__x))                     \
 221               __v = GUINT32_SWAP_LE_BE_CONSTANT (__x);          \
 222             else                                                \
 223              __asm__ __volatile__ ("shl %0 = %1, 32 ;;"         \
 224                                    "mux1 %0 = %0, @rev ;;"      \
 225                                     : "=r" (__v)                \
 226                                     : "r" (__x));               \
 227             __v; }))
 228 #    define GUINT64_SWAP_LE_BE_IA64(val) \
 229        (__extension__                                           \
 230         ({ register guint64 __v, __x = ((guint64) (val));       \
 231            if (__builtin_constant_p (__x))                      \
 232              __v = GUINT64_SWAP_LE_BE_CONSTANT (__x);           \
 233            else                                                 \
 234              __asm__ __volatile__ ("mux1 %0 = %1, @rev ;;"      \
 235                                    : "=r" (__v)                 \
 236                                    : "r" (__x));                \
 237            __v; }))
 238 #    define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_IA64 (val))
 239 #    define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_IA64 (val))
 240 #    define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_IA64 (val))
 241 #  elif defined (__x86_64__)
 242 #    define GUINT32_SWAP_LE_BE_X86_64(val) \
 243        (__extension__                                           \
 244          ({ register guint32 __v, __x = ((guint32) (val));      \
 245             if (__builtin_constant_p (__x))                     \
 246               __v = GUINT32_SWAP_LE_BE_CONSTANT (__x);          \
 247             else                                                \
 248              __asm__ ("bswapl %0"                               \
 249                       : "=r" (__v)                              \
 250                       : "0" (__x));                             \
 251             __v; }))
 252 #    define GUINT64_SWAP_LE_BE_X86_64(val) \
 253        (__extension__                                           \
 254         ({ register guint64 __v, __x = ((guint64) (val));       \
 255            if (__builtin_constant_p (__x))                      \
 256              __v = GUINT64_SWAP_LE_BE_CONSTANT (__x);           \
 257            else                                                 \
 258              __asm__ ("bswapq %0"                               \
 259                       : "=r" (__v)                              \
 260                       : "0" (__x));                             \
 261            __v; }))
 262      /* gcc seems to figure out optimal code for this on its own */
 263 #    define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
 264 #    define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_X86_64 (val))
 265 #    define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_X86_64 (val))
 266 #  else /* generic gcc */
 267 #    define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
 268 #    define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_CONSTANT (val))
 269 #    define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_CONSTANT (val))
 270 #  endif
 271 #else /* generic */
 272 #  define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
 273 #  define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_CONSTANT (val))
 274 #  define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_CONSTANT (val))
 275 #endif /* generic */
 276
 277 #define GUINT16_SWAP_LE_PDP(val)        ((guint16) (val))
 278 #define GUINT16_SWAP_BE_PDP(val)        (GUINT16_SWAP_LE_BE (val))
 279 #define GUINT32_SWAP_LE_PDP(val)        ((guint32) ( \
 280     (((guint32) (val) & (guint32) 0x0000ffffU) << 16) | \
 281     (((guint32) (val) & (guint32) 0xffff0000U) >> 16)))
 282 #define GUINT32_SWAP_BE_PDP(val)        ((guint32) ( \
 283     (((guint32) (val) & (guint32) 0x00ff00ffU) << 8) | \
 284     (((guint32) (val) & (guint32) 0xff00ff00U) >> 8)))
 285
 286 /* The G*_TO_?E() macros are defined in glibconfig.h.
 287  * The transformation is symmetric, so the FROM just maps to the TO.
 288  */
 289 #define GINT16_FROM_LE(val)     (GINT16_TO_LE (val))
 290 #define GUINT16_FROM_LE(val)    (GUINT16_TO_LE (val))
 291 #define GINT16_FROM_BE(val)     (GINT16_TO_BE (val))
 292 #define GUINT16_FROM_BE(val)    (GUINT16_TO_BE (val))
 293 #define GINT32_FROM_LE(val)     (GINT32_TO_LE (val))
 294 #define GUINT32_FROM_LE(val)    (GUINT32_TO_LE (val))
 295 #define GINT32_FROM_BE(val)     (GINT32_TO_BE (val))
 296 #define GUINT32_FROM_BE(val)    (GUINT32_TO_BE (val))
 297
 298 #define GINT64_FROM_LE(val)     (GINT64_TO_LE (val))
 299 #define GUINT64_FROM_LE(val)    (GUINT64_TO_LE (val))
 300 #define GINT64_FROM_BE(val)     (GINT64_TO_BE (val))
 301 #define GUINT64_FROM_BE(val)    (GUINT64_TO_BE (val))
 302
 303 #define GLONG_FROM_LE(val)      (GLONG_TO_LE (val))
 304 #define GULONG_FROM_LE(val)     (GULONG_TO_LE (val))
 305 #define GLONG_FROM_BE(val)      (GLONG_TO_BE (val))
 306 #define GULONG_FROM_BE(val)     (GULONG_TO_BE (val))
 307
 308 #define GINT_FROM_LE(val)       (GINT_TO_LE (val))
 309 #define GUINT_FROM_LE(val)      (GUINT_TO_LE (val))
 310 #define GINT_FROM_BE(val)       (GINT_TO_BE (val))
 311 #define GUINT_FROM_BE(val)      (GUINT_TO_BE (val))
 312
 313
 314 /* Portable versions of host-network order stuff
 315  */
 316 #define g_ntohl(val) (GUINT32_FROM_BE (val))
 317 #define g_ntohs(val) (GUINT16_FROM_BE (val))
 318 #define g_htonl(val) (GUINT32_TO_BE (val))
 319 #define g_htons(val) (GUINT16_TO_BE (val))
 320
 321 /* IEEE Standard 754 Single Precision Storage Format (gfloat):
 322  *
 323  *        31 30           23 22            0
 324  * +--------+---------------+---------------+
 325  * | s 1bit | e[30:23] 8bit | f[22:0] 23bit |
 326  * +--------+---------------+---------------+
 327  * B0------------------->B1------->B2-->B3-->
 328  *
 329  * IEEE Standard 754 Double Precision Storage Format (gdouble):
 330  *
 331  *        63 62            52 51            32   31            0
 332  * +--------+----------------+----------------+ +---------------+
 333  * | s 1bit | e[62:52] 11bit | f[51:32] 20bit | | f[31:0] 32bit |
 334  * +--------+----------------+----------------+ +---------------+
 335  * B0--------------->B1---------->B2--->B3---->  B4->B5->B6->B7->
 336  */
 337 /* subtract from biased_exponent to form base2 exponent (normal numbers) */
 338 typedef union  _GDoubleIEEE754  GDoubleIEEE754;
 339 typedef union  _GFloatIEEE754   GFloatIEEE754;
 340 #define G_IEEE754_FLOAT_BIAS    (127)
 341 #define G_IEEE754_DOUBLE_BIAS   (1023)
 342 /* multiply with base2 exponent to get base10 exponent (normal numbers) */
 343 #define G_LOG_2_BASE_10         (0.30102999566398119521)
 344 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 345 union _GFloatIEEE754
 346 {
 347   gfloat v_float;
 348   struct {
 349     guint mantissa : 23;
 350     guint biased_exponent : 8;
 351     guint sign : 1;
 352   } mpn;
 353 };
 354 union _GDoubleIEEE754
 355 {
 356   gdouble v_double;
 357   struct {
 358     guint mantissa_low : 32;
 359     guint mantissa_high : 20;
 360     guint biased_exponent : 11;
 361     guint sign : 1;
 362   } mpn;
 363 };
 364 #elif G_BYTE_ORDER == G_BIG_ENDIAN
 365 union _GFloatIEEE754
 366 {
 367   gfloat v_float;
 368   struct {
 369     guint sign : 1;
 370     guint biased_exponent : 8;
 371     guint mantissa : 23;
 372   } mpn;
 373 };
 374 union _GDoubleIEEE754
 375 {
 376   gdouble v_double;
 377   struct {
 378     guint sign : 1;
 379     guint biased_exponent : 11;
 380     guint mantissa_high : 20;
 381     guint mantissa_low : 32;
 382   } mpn;
 383 };
 384 #else /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
 385 #error unknown ENDIAN type
 386 #endif /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
 387
 388 typedef struct _GTimeVal                GTimeVal;
 389
 390 struct _GTimeVal
 391 {
 392   glong tv_sec;
 393   glong tv_usec;
 394 };
 395
 396 G_END_DECLS
 397
 398 /* We prefix variable declarations so they can
 399  * properly get exported in windows dlls.
 400  */
 401 #ifndef GLIB_VAR
 402 #  ifdef G_PLATFORM_WIN32
 403 #    ifdef GLIB_STATIC_COMPILATION
 404 #      define GLIB_VAR extern
 405 #    else /* !GLIB_STATIC_COMPILATION */
 406 #      ifdef GLIB_COMPILATION
 407 #        ifdef DLL_EXPORT
 408 #          define GLIB_VAR __declspec(dllexport)
 409 #        else /* !DLL_EXPORT */
 410 #          define GLIB_VAR extern
 411 #        endif /* !DLL_EXPORT */
 412 #      else /* !GLIB_COMPILATION */
 413 #        define GLIB_VAR extern __declspec(dllimport)
 414 #      endif /* !GLIB_COMPILATION */
 415 #    endif /* !GLIB_STATIC_COMPILATION */
 416 #  else /* !G_PLATFORM_WIN32 */
 417 #    define GLIB_VAR extern
 418 #  endif /* !G_PLATFORM_WIN32 */
 419 #endif /* GLIB_VAR */
 420
 421 #endif /* __G_TYPES_H__ */
 422