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, 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 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  28 #error "Only <glib.h> can be included directly."
  29 #endif
  30
  31 #ifndef __G_UTILS_H__
  32 #define __G_UTILS_H__
  33
  34 #include <glib/gtypes.h>
  35 #include <stdarg.h>
  36
  37 G_BEGIN_DECLS
  38
  39 /* Define G_VA_COPY() to do the right thing for copying va_list variables.
  40  * glibconfig.h may have already defined G_VA_COPY as va_copy or __va_copy.
  41  */
  42 #if !defined (G_VA_COPY)
  43 #  if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
  44 #    define G_VA_COPY(ap1, ap2)   (*(ap1) = *(ap2))
  45 #  elif defined (G_VA_COPY_AS_ARRAY)
  46 #    define G_VA_COPY(ap1, ap2)   g_memmove ((ap1), (ap2), sizeof (va_list))
  47 #  else /* va_list is a pointer */
  48 #    define G_VA_COPY(ap1, ap2)   ((ap1) = (ap2))
  49 #  endif /* va_list is a pointer */
  50 #endif /* !G_VA_COPY */
  51
  52 /* inlining hassle. for compilers that don't allow the `inline' keyword,
  53  * mostly because of strict ANSI C compliance or dumbness, we try to fall
  54  * back to either `__inline__' or `__inline'.
  55  * G_CAN_INLINE is defined in glibconfig.h if the compiler seems to be
  56  * actually *capable* to do function inlining, in which case inline
  57  * function bodies do make sense. we also define G_INLINE_FUNC to properly
  58  * export the function prototypes if no inlining can be performed.
  59  * inline function bodies have to be special cased with G_CAN_INLINE and a
  60  * .c file specific macro to allow one compiled instance with extern linkage
  61  * of the functions by defining G_IMPLEMENT_INLINES and the .c file macro.
  62  */
  63 #if defined (G_HAVE_INLINE) && defined (__GNUC__) && defined (__STRICT_ANSI__)
  64 #  undef inline
  65 #  define inline __inline__
  66 #elif !defined (G_HAVE_INLINE)
  67 #  undef inline
  68 #  if defined (G_HAVE___INLINE__)
  69 #    define inline __inline__
  70 #  elif defined (G_HAVE___INLINE)
  71 #    define inline __inline
  72 #  else /* !inline && !__inline__ && !__inline */
  73 #    define inline  /* don't inline, then */
  74 #  endif
  75 #endif
  76 #ifdef G_IMPLEMENT_INLINES
  77 #  define G_INLINE_FUNC
  78 #  undef  G_CAN_INLINE
  79 #elif defined (__GNUC__)
  80 #  define G_INLINE_FUNC static __inline __attribute__ ((unused))
  81 #elif defined (G_CAN_INLINE)
  82 #  define G_INLINE_FUNC static inline
  83 #else /* can't inline */
  84 #  define G_INLINE_FUNC
  85 #endif /* !G_INLINE_FUNC */
  86
  87 #ifndef __GTK_DOC_IGNORE__
  88 #ifdef G_OS_WIN32
  89 #define g_get_user_name g_get_user_name_utf8
  90 #define g_get_real_name g_get_real_name_utf8
  91 #define g_get_home_dir g_get_home_dir_utf8
  92 #define g_get_tmp_dir g_get_tmp_dir_utf8
  93 #endif
  94 #endif
  95
  96 const gchar *         g_get_user_name        (void);
  97 const gchar *         g_get_real_name        (void);
  98 const gchar *         g_get_home_dir         (void);
  99 const gchar *         g_get_tmp_dir          (void);
 100 const gchar *         g_get_host_name        (void);
 101 gchar *               g_get_prgname          (void);
 102 void                  g_set_prgname          (const gchar *prgname);
 103 const gchar *         g_get_application_name (void);
 104 void                  g_set_application_name (const gchar *application_name);
 105
 106 void      g_reload_user_special_dirs_cache     (void);
 107 const gchar *         g_get_user_data_dir      (void);
 108 const gchar *         g_get_user_config_dir    (void);
 109 const gchar *         g_get_user_cache_dir     (void);
 110 const gchar * const * g_get_system_data_dirs   (void);
 111
 112 #ifdef G_OS_WIN32
 113 /* This functions is not part of the public GLib API */
 114 const gchar * const * g_win32_get_system_data_dirs_for_module (void (*address_of_function)(void));
 115 #endif
 116
 117 #if defined (G_OS_WIN32) && defined (G_CAN_INLINE) && !defined (__cplusplus)
 118 /* This function is not part of the public GLib API either. Just call
 119  * g_get_system_data_dirs() in your code, never mind that that is
 120  * actually a macro and you will in fact call this inline function.
 121  */
 122 static inline const gchar * const *
 123 _g_win32_get_system_data_dirs (void)
 124 {
 125   return g_win32_get_system_data_dirs_for_module ((void (*)(void)) &_g_win32_get_system_data_dirs);
 126 }
 127 #define g_get_system_data_dirs _g_win32_get_system_data_dirs
 128 #endif
 129
 130 const gchar * const * g_get_system_config_dirs (void);
 131
 132 const gchar * g_get_user_runtime_dir (void);
 133
 134 /**
 135  * GUserDirectory:
 136  * @G_USER_DIRECTORY_DESKTOP: the user's Desktop directory
 137  * @G_USER_DIRECTORY_DOCUMENTS: the user's Documents directory
 138  * @G_USER_DIRECTORY_DOWNLOAD: the user's Downloads directory
 139  * @G_USER_DIRECTORY_MUSIC: the user's Music directory
 140  * @G_USER_DIRECTORY_PICTURES: the user's Pictures directory
 141  * @G_USER_DIRECTORY_PUBLIC_SHARE: the user's shared directory
 142  * @G_USER_DIRECTORY_TEMPLATES: the user's Templates directory
 143  * @G_USER_DIRECTORY_VIDEOS: the user's Movies directory
 144  * @G_USER_N_DIRECTORIES: the number of enum values
 145  *
 146  * These are logical ids for special directories which are defined
 147  * depending on the platform used. You should use g_get_user_special_dir()
 148  * to retrieve the full path associated to the logical id.
 149  *
 150  * The #GUserDirectory enumeration can be extended at later date. Not
 151  * every platform has a directory for every logical id in this
 152  * enumeration.
 153  *
 154  * Since: 2.14
 155  */
 156 typedef enum {
 157   G_USER_DIRECTORY_DESKTOP,
 158   G_USER_DIRECTORY_DOCUMENTS,
 159   G_USER_DIRECTORY_DOWNLOAD,
 160   G_USER_DIRECTORY_MUSIC,
 161   G_USER_DIRECTORY_PICTURES,
 162   G_USER_DIRECTORY_PUBLIC_SHARE,
 163   G_USER_DIRECTORY_TEMPLATES,
 164   G_USER_DIRECTORY_VIDEOS,
 165
 166   G_USER_N_DIRECTORIES
 167 } GUserDirectory;
 168
 169 const gchar * g_get_user_special_dir (GUserDirectory directory);
 170
 171 /**
 172  * GDebugKey:
 173  * @key: the string
 174  * @value: the flag
 175  *
 176  * Associates a string with a bit flag.
 177  * Used in g_parse_debug_string().
 178  */
 179 typedef struct _GDebugKey GDebugKey;
 180 struct _GDebugKey
 181 {
 182   const gchar *key;
 183   guint        value;
 184 };
 185
 186 /* Miscellaneous utility functions
 187  */
 188 guint                 g_parse_debug_string (const gchar     *string,
 189                                             const GDebugKey *keys,
 190                                             guint            nkeys);
 191
 192 gint                  g_snprintf           (gchar       *string,
 193                                             gulong       n,
 194                                             gchar const *format,
 195                                             ...) G_GNUC_PRINTF (3, 4);
 196 gint                  g_vsnprintf          (gchar       *string,
 197                                             gulong       n,
 198                                             gchar const *format,
 199                                             va_list      args);
 200
 201 void                  g_nullify_pointer    (gpointer    *nullify_location);
 202
 203 typedef enum
 204 {
 205   G_FORMAT_SIZE_DEFAULT     = 0,
 206   G_FORMAT_SIZE_LONG_FORMAT = 1 << 0,
 207   G_FORMAT_SIZE_IEC_UNITS   = 1 << 1
 208 } GFormatSizeFlags;
 209
 210 gchar *g_format_size_full   (guint64          size,
 211                              GFormatSizeFlags flags);
 212 gchar *g_format_size        (guint64          size);
 213
 214 GLIB_DEPRECATED_FOR(g_format_size)
 215 gchar *g_format_size_for_display (goffset size);
 216
 217 #ifndef G_DISABLE_DEPRECATED
 218 /**
 219  * GVoidFunc:
 220  *
 221  * Declares a type of function which takes no arguments
 222  * and has no return value. It is used to specify the type
 223  * function passed to g_atexit().
 224  */
 225 typedef void (*GVoidFunc) (void);
 226 #ifndef ATEXIT
 227 # define ATEXIT(proc) g_ATEXIT(proc)
 228 #else
 229 # define G_NATIVE_ATEXIT
 230 #endif /* ATEXIT */
 231 /* we use a GLib function as a replacement for ATEXIT, so
 232  * the programmer is not required to check the return value
 233  * (if there is any in the implementation) and doesn't encounter
 234  * missing include files.
 235  */
 236 GLIB_DEPRECATED
 237 void    g_atexit                (GVoidFunc    func);
 238
 239 #ifdef G_OS_WIN32
 240 /* It's a bad idea to wrap atexit() on Windows. If the GLib DLL calls
 241  * atexit(), the function will be called when the GLib DLL is detached
 242  * from the program, which is not what the caller wants. The caller
 243  * wants the function to be called when it *itself* exits (or is
 244  * detached, in case the caller, too, is a DLL).
 245  */
 246 #if (defined(__MINGW_H) && !defined(_STDLIB_H_)) || (defined(_MSC_VER) && !defined(_INC_STDLIB))
 247 int atexit (void (*)(void));
 248 #endif
 249 #define g_atexit(func) atexit(func)
 250 #endif
 251
 252 #endif  /* G_DISABLE_DEPRECATED */
 253
 254 #ifndef __GTK_DOC_IGNORE__
 255 #ifdef G_OS_WIN32
 256 #define g_find_program_in_path g_find_program_in_path_utf8
 257 #endif
 258 #endif
 259
 260 /* Look for an executable in PATH, following execvp() rules */
 261 gchar*  g_find_program_in_path  (const gchar *program);
 262
 263 /* Bit tests
 264  */
 265 G_INLINE_FUNC gint      g_bit_nth_lsf (gulong  mask,
 266                                        gint    nth_bit) G_GNUC_CONST;
 267 G_INLINE_FUNC gint      g_bit_nth_msf (gulong  mask,
 268                                        gint    nth_bit) G_GNUC_CONST;
 269 G_INLINE_FUNC guint     g_bit_storage (gulong  number) G_GNUC_CONST;
 270
 271 /* inline function implementations
 272  */
 273 #if defined (G_CAN_INLINE) || defined (__G_UTILS_C__)
 274 G_INLINE_FUNC gint
 275 g_bit_nth_lsf (gulong mask,
 276                gint   nth_bit)
 277 {
 278   if (G_UNLIKELY (nth_bit < -1))
 279     nth_bit = -1;
 280   while (nth_bit < ((GLIB_SIZEOF_LONG * 8) - 1))
 281     {
 282       nth_bit++;
 283       if (mask & (1UL << nth_bit))
 284         return nth_bit;
 285     }
 286   return -1;
 287 }
 288 G_INLINE_FUNC gint
 289 g_bit_nth_msf (gulong mask,
 290                gint   nth_bit)
 291 {
 292   if (nth_bit < 0 || G_UNLIKELY (nth_bit > GLIB_SIZEOF_LONG * 8))
 293     nth_bit = GLIB_SIZEOF_LONG * 8;
 294   while (nth_bit > 0)
 295     {
 296       nth_bit--;
 297       if (mask & (1UL << nth_bit))
 298         return nth_bit;
 299     }
 300   return -1;
 301 }
 302 G_INLINE_FUNC guint
 303 g_bit_storage (gulong number)
 304 {
 305 #if defined(__GNUC__) && (__GNUC__ >= 4) && defined(__OPTIMIZE__)
 306   return G_LIKELY (number) ?
 307            ((GLIB_SIZEOF_LONG * 8U - 1) ^ __builtin_clzl(number)) + 1 : 1;
 308 #else
 309   register guint n_bits = 0;
 310
 311   do
 312     {
 313       n_bits++;
 314       number >>= 1;
 315     }
 316   while (number);
 317   return n_bits;
 318 #endif
 319 }
 320 #endif  /* G_CAN_INLINE || __G_UTILS_C__ */
 321
 322 G_END_DECLS
 323
 324 #ifndef G_DISABLE_DEPRECATED
 325
 326 /*
 327  * This macro is deprecated. This DllMain() is too complex. It is
 328  * recommended to write an explicit minimal DLlMain() that just saves
 329  * the handle to the DLL and then use that handle instead, for
 330  * instance passing it to
 331  * g_win32_get_package_installation_directory_of_module().
 332  *
 333  * On Windows, this macro defines a DllMain function that stores the
 334  * actual DLL name that the code being compiled will be included in.
 335  * STATIC should be empty or 'static'. DLL_NAME is the name of the
 336  * (pointer to the) char array where the DLL name will be stored. If
 337  * this is used, you must also include <windows.h>. If you need a more complex
 338  * DLL entry point function, you cannot use this.
 339  *
 340  * On non-Windows platforms, expands to nothing.
 341  */
 342
 343 #ifndef G_PLATFORM_WIN32
 344 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)
 345 #else
 346 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)                 \
 347 static char *dll_name;                                                  \
 348                                                                         \
 349 BOOL WINAPI                                                             \
 350 DllMain (HINSTANCE hinstDLL,                                            \
 351          DWORD     fdwReason,                                           \
 352          LPVOID    lpvReserved)                                         \
 353 {                                                                       \
 354   wchar_t wcbfr[1000];                                                  \
 355   char *tem;                                                            \
 356   switch (fdwReason)                                                    \
 357     {                                                                   \
 358     case DLL_PROCESS_ATTACH:                                            \
 359       GetModuleFileNameW ((HMODULE) hinstDLL, wcbfr, G_N_ELEMENTS (wcbfr)); \
 360       tem = g_utf16_to_utf8 (wcbfr, -1, NULL, NULL, NULL);              \
 361       dll_name = g_path_get_basename (tem);                             \
 362       g_free (tem);                                                     \
 363       break;                                                            \
 364     }                                                                   \
 365                                                                         \
 366   return TRUE;                                                          \
 367 }
 368
 369 #endif  /* !G_DISABLE_DEPRECATED */
 370
 371 #endif /* G_PLATFORM_WIN32 */
 372
 373 #endif /* __G_UTILS_H__ */