glib/gutils.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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  20  * file for a list of people on the GLib Team.  See the ChangeLog
  21  * files for a list of changes.  These files are distributed with
  22  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  23  */
  24
  25 #ifndef __G_UTILS_H__
  26 #define __G_UTILS_H__
  27
  28 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  29 #error "Only <glib.h> can be included directly."
  30 #endif
  31
  32 #include <glib/gtypes.h>
  33 #include <stdarg.h>
  34
  35 G_BEGIN_DECLS
  36
  37 /* Define G_VA_COPY() to do the right thing for copying va_list variables.
  38  * glibconfig.h may have already defined G_VA_COPY as va_copy or __va_copy.
  39  */
  40 #if !defined (G_VA_COPY)
  41 #  if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
  42 #    define G_VA_COPY(ap1, ap2)   (*(ap1) = *(ap2))
  43 #  elif defined (G_VA_COPY_AS_ARRAY)
  44 #    define G_VA_COPY(ap1, ap2)   memmove ((ap1), (ap2), sizeof (va_list))
  45 #  else /* va_list is a pointer */
  46 #    define G_VA_COPY(ap1, ap2)   ((ap1) = (ap2))
  47 #  endif /* va_list is a pointer */
  48 #endif /* !G_VA_COPY */
  49
  50 /* inlining hassle. for compilers that don't allow the 'inline' keyword,
  51  * mostly because of strict ANSI C compliance or dumbness, we try to fall
  52  * back to either '__inline__' or '__inline'.
  53  * G_CAN_INLINE is defined in glibconfig.h if the compiler seems to be
  54  * actually *capable* to do function inlining, in which case inline
  55  * function bodies do make sense. we also define G_INLINE_FUNC to properly
  56  * export the function prototypes if no inlining can be performed.
  57  * inline function bodies have to be special cased with G_CAN_INLINE and a
  58  * .c file specific macro to allow one compiled instance with extern linkage
  59  * of the functions by defining G_IMPLEMENT_INLINES and the .c file macro.
  60  */
  61 #if defined (G_HAVE_INLINE) && defined (__GNUC__) && defined (__STRICT_ANSI__)
  62 #  undef inline
  63 #  define inline __inline__
  64 #elif !defined (G_HAVE_INLINE)
  65 #  undef inline
  66 #  if defined (G_HAVE___INLINE__)
  67 #    define inline __inline__
  68 #  elif defined (G_HAVE___INLINE)
  69 #    define inline __inline
  70 #  else /* !inline && !__inline__ && !__inline */
  71 #    define inline  /* don't inline, then */
  72 #  endif
  73 #endif
  74 #ifdef G_IMPLEMENT_INLINES
  75 #  define G_INLINE_FUNC _GLIB_EXTERN
  76 #  undef  G_CAN_INLINE
  77 #elif defined (__GNUC__)
  78 #  define G_INLINE_FUNC static __inline __attribute__ ((unused))
  79 #elif defined (G_CAN_INLINE)
  80 #  define G_INLINE_FUNC static inline
  81 #else /* can't inline */
  82 #  define G_INLINE_FUNC _GLIB_EXTERN
  83 #endif /* !G_INLINE_FUNC */
  84
  85 GLIB_AVAILABLE_IN_ALL
  86 const gchar *         g_get_user_name        (void);
  87 GLIB_AVAILABLE_IN_ALL
  88 const gchar *         g_get_real_name        (void);
  89 GLIB_AVAILABLE_IN_ALL
  90 const gchar *         g_get_home_dir         (void);
  91 GLIB_AVAILABLE_IN_ALL
  92 const gchar *         g_get_tmp_dir          (void);
  93 GLIB_AVAILABLE_IN_ALL
  94 const gchar *         g_get_host_name        (void);
  95 GLIB_AVAILABLE_IN_ALL
  96 const gchar *         g_get_prgname          (void);
  97 GLIB_AVAILABLE_IN_ALL
  98 void                  g_set_prgname          (const gchar *prgname);
  99 GLIB_AVAILABLE_IN_ALL
 100 const gchar *         g_get_application_name (void);
 101 GLIB_AVAILABLE_IN_ALL
 102 void                  g_set_application_name (const gchar *application_name);
 103
 104 GLIB_AVAILABLE_IN_ALL
 105 void      g_reload_user_special_dirs_cache     (void);
 106 GLIB_AVAILABLE_IN_ALL
 107 const gchar *         g_get_user_data_dir      (void);
 108 GLIB_AVAILABLE_IN_ALL
 109 const gchar *         g_get_user_config_dir    (void);
 110 GLIB_AVAILABLE_IN_ALL
 111 const gchar *         g_get_user_cache_dir     (void);
 112 GLIB_AVAILABLE_IN_ALL
 113 const gchar * const * g_get_system_data_dirs   (void);
 114
 115 #ifdef G_OS_WIN32
 116 /* This functions is not part of the public GLib API */
 117 GLIB_AVAILABLE_IN_ALL
 118 const gchar * const * g_win32_get_system_data_dirs_for_module (void (*address_of_function)(void));
 119 #endif
 120
 121 #if defined (G_OS_WIN32) && defined (G_CAN_INLINE) && !defined (__cplusplus)
 122 /* This function is not part of the public GLib API either. Just call
 123  * g_get_system_data_dirs() in your code, never mind that that is
 124  * actually a macro and you will in fact call this inline function.
 125  */
 126 static inline const gchar * const *
 127 _g_win32_get_system_data_dirs (void)
 128 {
 129   return g_win32_get_system_data_dirs_for_module ((void (*)(void)) &_g_win32_get_system_data_dirs);
 130 }
 131 #define g_get_system_data_dirs _g_win32_get_system_data_dirs
 132 #endif
 133
 134 GLIB_AVAILABLE_IN_ALL
 135 const gchar * const * g_get_system_config_dirs (void);
 136
 137 GLIB_AVAILABLE_IN_ALL
 138 const gchar * g_get_user_runtime_dir (void);
 139
 140 /**
 141  * GUserDirectory:
 142  * @G_USER_DIRECTORY_DESKTOP: the user's Desktop directory
 143  * @G_USER_DIRECTORY_DOCUMENTS: the user's Documents directory
 144  * @G_USER_DIRECTORY_DOWNLOAD: the user's Downloads directory
 145  * @G_USER_DIRECTORY_MUSIC: the user's Music directory
 146  * @G_USER_DIRECTORY_PICTURES: the user's Pictures directory
 147  * @G_USER_DIRECTORY_PUBLIC_SHARE: the user's shared directory
 148  * @G_USER_DIRECTORY_TEMPLATES: the user's Templates directory
 149  * @G_USER_DIRECTORY_VIDEOS: the user's Movies directory
 150  * @G_USER_N_DIRECTORIES: the number of enum values
 151  *
 152  * These are logical ids for special directories which are defined
 153  * depending on the platform used. You should use g_get_user_special_dir()
 154  * to retrieve the full path associated to the logical id.
 155  *
 156  * The #GUserDirectory enumeration can be extended at later date. Not
 157  * every platform has a directory for every logical id in this
 158  * enumeration.
 159  *
 160  * Since: 2.14
 161  */
 162 typedef enum {
 163   G_USER_DIRECTORY_DESKTOP,
 164   G_USER_DIRECTORY_DOCUMENTS,
 165   G_USER_DIRECTORY_DOWNLOAD,
 166   G_USER_DIRECTORY_MUSIC,
 167   G_USER_DIRECTORY_PICTURES,
 168   G_USER_DIRECTORY_PUBLIC_SHARE,
 169   G_USER_DIRECTORY_TEMPLATES,
 170   G_USER_DIRECTORY_VIDEOS,
 171
 172   G_USER_N_DIRECTORIES
 173 } GUserDirectory;
 174
 175 GLIB_AVAILABLE_IN_ALL
 176 const gchar * g_get_user_special_dir (GUserDirectory directory);
 177
 178 /**
 179  * GDebugKey:
 180  * @key: the string
 181  * @value: the flag
 182  *
 183  * Associates a string with a bit flag.
 184  * Used in g_parse_debug_string().
 185  */
 186 typedef struct _GDebugKey GDebugKey;
 187 struct _GDebugKey
 188 {
 189   const gchar *key;
 190   guint        value;
 191 };
 192
 193 /* Miscellaneous utility functions
 194  */
 195 GLIB_AVAILABLE_IN_ALL
 196 guint                 g_parse_debug_string (const gchar     *string,
 197                                             const GDebugKey *keys,
 198                                             guint            nkeys);
 199
 200 GLIB_AVAILABLE_IN_ALL
 201 gint                  g_snprintf           (gchar       *string,
 202                                             gulong       n,
 203                                             gchar const *format,
 204                                             ...) G_GNUC_PRINTF (3, 4);
 205 GLIB_AVAILABLE_IN_ALL
 206 gint                  g_vsnprintf          (gchar       *string,
 207                                             gulong       n,
 208                                             gchar const *format,
 209                                             va_list      args)
 210                                             G_GNUC_PRINTF(3, 0);
 211
 212 GLIB_AVAILABLE_IN_ALL
 213 void                  g_nullify_pointer    (gpointer    *nullify_location);
 214
 215 typedef enum
 216 {
 217   G_FORMAT_SIZE_DEFAULT     = 0,
 218   G_FORMAT_SIZE_LONG_FORMAT = 1 << 0,
 219   G_FORMAT_SIZE_IEC_UNITS   = 1 << 1
 220 } GFormatSizeFlags;
 221
 222 GLIB_AVAILABLE_IN_2_30
 223 gchar *g_format_size_full   (guint64          size,
 224                              GFormatSizeFlags flags);
 225 GLIB_AVAILABLE_IN_2_30
 226 gchar *g_format_size        (guint64          size);
 227
 228 GLIB_DEPRECATED_FOR(g_format_size)
 229 gchar *g_format_size_for_display (goffset size);
 230
 231 #ifndef G_DISABLE_DEPRECATED
 232 /**
 233  * GVoidFunc:
 234  *
 235  * Declares a type of function which takes no arguments
 236  * and has no return value. It is used to specify the type
 237  * function passed to g_atexit().
 238  */
 239 typedef void (*GVoidFunc) (void);
 240 #define ATEXIT(proc) g_ATEXIT(proc)
 241 GLIB_DEPRECATED
 242 void    g_atexit                (GVoidFunc    func);
 243
 244 #ifdef G_OS_WIN32
 245 /* It's a bad idea to wrap atexit() on Windows. If the GLib DLL calls
 246  * atexit(), the function will be called when the GLib DLL is detached
 247  * from the program, which is not what the caller wants. The caller
 248  * wants the function to be called when it *itself* exits (or is
 249  * detached, in case the caller, too, is a DLL).
 250  */
 251 #if (defined(__MINGW_H) && !defined(_STDLIB_H_)) || (defined(_MSC_VER) && !defined(_INC_STDLIB))
 252 int atexit (void (*)(void));
 253 #endif
 254 #define g_atexit(func) atexit(func)
 255 #endif
 256
 257 #endif
 258
 259
 260 /* Look for an executable in PATH, following execvp() rules */
 261 GLIB_AVAILABLE_IN_ALL
 262 gchar*  g_find_program_in_path  (const gchar *program);
 263
 264 /* Bit tests
 265  */
 266 G_INLINE_FUNC gint      g_bit_nth_lsf (gulong  mask,
 267                                        gint    nth_bit) G_GNUC_CONST;
 268 G_INLINE_FUNC gint      g_bit_nth_msf (gulong  mask,
 269                                        gint    nth_bit) G_GNUC_CONST;
 270 G_INLINE_FUNC guint     g_bit_storage (gulong  number) G_GNUC_CONST;
 271
 272 /* inline function implementations
 273  */
 274 #if defined (G_CAN_INLINE) || defined (__G_UTILS_C__)
 275 G_INLINE_FUNC gint
 276 g_bit_nth_lsf (gulong mask,
 277                gint   nth_bit)
 278 {
 279   if (G_UNLIKELY (nth_bit < -1))
 280     nth_bit = -1;
 281   while (nth_bit < ((GLIB_SIZEOF_LONG * 8) - 1))
 282     {
 283       nth_bit++;
 284       if (mask & (1UL << nth_bit))
 285         return nth_bit;
 286     }
 287   return -1;
 288 }
 289 G_INLINE_FUNC gint
 290 g_bit_nth_msf (gulong mask,
 291                gint   nth_bit)
 292 {
 293   if (nth_bit < 0 || G_UNLIKELY (nth_bit > GLIB_SIZEOF_LONG * 8))
 294     nth_bit = GLIB_SIZEOF_LONG * 8;
 295   while (nth_bit > 0)
 296     {
 297       nth_bit--;
 298       if (mask & (1UL << nth_bit))
 299         return nth_bit;
 300     }
 301   return -1;
 302 }
 303 G_INLINE_FUNC guint
 304 g_bit_storage (gulong number)
 305 {
 306 #if defined(__GNUC__) && (__GNUC__ >= 4) && defined(__OPTIMIZE__)
 307   return G_LIKELY (number) ?
 308            ((GLIB_SIZEOF_LONG * 8U - 1) ^ (guint) __builtin_clzl(number)) + 1 : 1;
 309 #else
 310   guint n_bits = 0;
 311
 312   do
 313     {
 314       n_bits++;
 315       number >>= 1;
 316     }
 317   while (number);
 318   return n_bits;
 319 #endif
 320 }
 321 #endif  /* G_CAN_INLINE || __G_UTILS_C__ */
 322
 323 #ifndef G_DISABLE_DEPRECATED
 324
 325 /*
 326  * This macro is deprecated. This DllMain() is too complex. It is
 327  * recommended to write an explicit minimal DLlMain() that just saves
 328  * the handle to the DLL and then use that handle instead, for
 329  * instance passing it to
 330  * g_win32_get_package_installation_directory_of_module().
 331  *
 332  * On Windows, this macro defines a DllMain function that stores the
 333  * actual DLL name that the code being compiled will be included in.
 334  * STATIC should be empty or 'static'. DLL_NAME is the name of the
 335  * (pointer to the) char array where the DLL name will be stored. If
 336  * this is used, you must also include <windows.h>. If you need a more complex
 337  * DLL entry point function, you cannot use this.
 338  *
 339  * On non-Windows platforms, expands to nothing.
 340  */
 341
 342 #ifndef G_PLATFORM_WIN32
 343 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)
 344 #else
 345 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)                 \
 346 static char *dll_name;                                                  \
 347                                                                         \
 348 BOOL WINAPI                                                             \
 349 DllMain (HINSTANCE hinstDLL,                                            \
 350          DWORD     fdwReason,                                           \
 351          LPVOID    lpvReserved)                                         \
 352 {                                                                       \
 353   wchar_t wcbfr[1000];                                                  \
 354   char *tem;                                                            \
 355   switch (fdwReason)                                                    \
 356     {                                                                   \
 357     case DLL_PROCESS_ATTACH:                                            \
 358       GetModuleFileNameW ((HMODULE) hinstDLL, wcbfr, G_N_ELEMENTS (wcbfr)); \
 359       tem = g_utf16_to_utf8 (wcbfr, -1, NULL, NULL, NULL);              \
 360       dll_name = g_path_get_basename (tem);                             \
 361       g_free (tem);                                                     \
 362       break;                                                            \
 363     }                                                                   \
 364                                                                         \
 365   return TRUE;                                                          \
 366 }
 367
 368 #endif  /* !G_DISABLE_DEPRECATED */
 369
 370 #endif /* G_PLATFORM_WIN32 */
 371
 372 G_END_DECLS
 373
 374 #endif /* __G_UTILS_H__ */