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 #ifndef __G_UTILS_H__
  28 #define __G_UTILS_H__
  29
  30 #include <glib/gtypes.h>
  31 #include <stdarg.h>
  32
  33 G_BEGIN_DECLS
  34
  35 #ifdef G_OS_WIN32
  36
  37 /* On native Win32, directory separator is the backslash, and search path
  38  * separator is the semicolon.
  39  */
  40 #define G_DIR_SEPARATOR '\\'
  41 #define G_DIR_SEPARATOR_S "\\"
  42 #define G_SEARCHPATH_SEPARATOR ';'
  43 #define G_SEARCHPATH_SEPARATOR_S ";"
  44
  45 #else  /* !G_OS_WIN32 */
  46
  47 /* Unix */
  48
  49 #define G_DIR_SEPARATOR '/'
  50 #define G_DIR_SEPARATOR_S "/"
  51 #define G_SEARCHPATH_SEPARATOR ':'
  52 #define G_SEARCHPATH_SEPARATOR_S ":"
  53
  54 #endif /* !G_OS_WIN32 */
  55
  56 /* Define G_VA_COPY() to do the right thing for copying va_list variables.
  57  * glibconfig.h may have already defined G_VA_COPY as va_copy or __va_copy.
  58  */
  59 #if !defined (G_VA_COPY)
  60 #  if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
  61 #    define G_VA_COPY(ap1, ap2)   (*(ap1) = *(ap2))
  62 #  elif defined (G_VA_COPY_AS_ARRAY)
  63 #    define G_VA_COPY(ap1, ap2)   g_memmove ((ap1), (ap2), sizeof (va_list))
  64 #  else /* va_list is a pointer */
  65 #    define G_VA_COPY(ap1, ap2)   ((ap1) = (ap2))
  66 #  endif /* va_list is a pointer */
  67 #endif /* !G_VA_COPY */
  68
  69 /* inlining hassle. for compilers that don't allow the `inline' keyword,
  70  * mostly because of strict ANSI C compliance or dumbness, we try to fall
  71  * back to either `__inline__' or `__inline'.
  72  * we define G_CAN_INLINE, if the compiler seems to be actually
  73  * *capable* to do function inlining, in which case inline function bodys
  74  * do make sense. we also define G_INLINE_FUNC to properly export the
  75  * function prototypes if no inlining can be performed.
  76  * inline function bodies have to be special cased with G_CAN_INLINE and a
  77  * .c file specific macro to allow one compiled instance with extern linkage
  78  * of the functions by defining G_IMPLEMENT_INLINES and the .c file macro.
  79  */
  80 #ifdef G_IMPLEMENT_INLINES
  81 #  define G_INLINE_FUNC extern
  82 #  undef  G_CAN_INLINE
  83 #endif
  84 #ifndef G_INLINE_FUNC
  85 #  define G_CAN_INLINE 1
  86 #endif
  87 #if defined (G_HAVE_INLINE) && defined (__GNUC__) && defined (__STRICT_ANSI__)
  88 #  undef inline
  89 #  define inline __inline__
  90 #elif !defined (G_HAVE_INLINE)
  91 #  undef inline
  92 #  if defined (G_HAVE___INLINE__)
  93 #    define inline __inline__
  94 #  elif defined (G_HAVE___INLINE)
  95 #    define inline __inline
  96 #  else /* !inline && !__inline__ && !__inline */
  97 #    define inline  /* don't inline, then */
  98 #    ifndef G_INLINE_FUNC
  99 #      undef G_CAN_INLINE
 100 #    endif
 101 #  endif
 102 #endif
 103 #ifndef G_INLINE_FUNC
 104 #  if defined (__GNUC__) && (__OPTIMIZE__)
 105 #    define G_INLINE_FUNC extern inline
 106 #  elif defined (G_CAN_INLINE) && !defined (__GNUC__)
 107 #    define G_INLINE_FUNC static inline
 108 #  else /* can't inline */
 109 #    define G_INLINE_FUNC extern
 110 #    undef G_CAN_INLINE
 111 #  endif
 112 #endif /* !G_INLINE_FUNC */
 113
 114 /* Retrive static string info
 115  */
 116 G_CONST_RETURN gchar* g_get_user_name        (void);
 117 G_CONST_RETURN gchar* g_get_real_name        (void);
 118 G_CONST_RETURN gchar* g_get_home_dir         (void);
 119 G_CONST_RETURN gchar* g_get_tmp_dir          (void);
 120 gchar*                g_get_prgname          (void);
 121 void                  g_set_prgname          (const gchar *prgname);
 122 G_CONST_RETURN gchar* g_get_application_name (void);
 123 void                  g_set_application_name (const gchar *application_name);
 124
 125
 126 typedef struct _GDebugKey       GDebugKey;
 127 struct _GDebugKey
 128 {
 129   gchar *key;
 130   guint  value;
 131 };
 132
 133 /* Miscellaneous utility functions
 134  */
 135 guint                 g_parse_debug_string (const gchar     *string,
 136                                             const GDebugKey *keys,
 137                                             guint            nkeys);
 138
 139 gint                  g_snprintf           (gchar       *string,
 140                                             gulong       n,
 141                                             gchar const *format,
 142                                             ...) G_GNUC_PRINTF (3, 4);
 143 gint                  g_vsnprintf          (gchar       *string,
 144                                             gulong       n,
 145                                             gchar const *format,
 146                                             va_list      args);
 147
 148 /* Check if a file name is an absolute path */
 149 gboolean              g_path_is_absolute   (const gchar *file_name);
 150
 151 /* In case of absolute paths, skip the root part */
 152 G_CONST_RETURN gchar* g_path_skip_root     (const gchar *file_name);
 153
 154 #ifndef G_DISABLE_DEPRECATED
 155
 156 /* These two functions are deprecated and will be removed in the next
 157  * major release of GLib. Use g_path_get_dirname/g_path_get_basename
 158  * instead. Whatch out! The string returned by g_path_get_basename
 159  * must be g_freed, while the string returned by g_basename must not.*/
 160 G_CONST_RETURN gchar* g_basename           (const gchar *file_name);
 161 #define g_dirname g_path_get_dirname
 162
 163 #endif /* G_DISABLE_DEPRECATED */
 164
 165 /* The returned strings are newly allocated with g_malloc() */
 166 gchar*                g_get_current_dir    (void);
 167 gchar*                g_path_get_basename  (const gchar *file_name);
 168 gchar*                g_path_get_dirname   (const gchar *file_name);
 169
 170
 171 /* Set the pointer at the specified location to NULL */
 172 void                  g_nullify_pointer    (gpointer    *nullify_location);
 173
 174 /* Get the codeset for the current locale */
 175 /* gchar * g_get_codeset    (void); */
 176
 177 /* return the environment string for the variable. The returned memory
 178  * must not be freed. */
 179 G_CONST_RETURN gchar* g_getenv             (const gchar *variable);
 180
 181
 182 /* we try to provide a usefull equivalent for ATEXIT if it is
 183  * not defined, but use is actually abandoned. people should
 184  * use g_atexit() instead.
 185  */
 186 typedef void            (*GVoidFunc)            (void);
 187 #ifndef ATEXIT
 188 # define ATEXIT(proc)   g_ATEXIT(proc)
 189 #else
 190 # define G_NATIVE_ATEXIT
 191 #endif /* ATEXIT */
 192 /* we use a GLib function as a replacement for ATEXIT, so
 193  * the programmer is not required to check the return value
 194  * (if there is any in the implementation) and doesn't encounter
 195  * missing include files.
 196  */
 197 void    g_atexit                (GVoidFunc    func);
 198
 199 /* Look for an executable in PATH, following execvp() rules */
 200 gchar*  g_find_program_in_path  (const gchar *program);
 201
 202 /* Bit tests
 203  */
 204 G_INLINE_FUNC gint      g_bit_nth_lsf (gulong  mask,
 205                                        gint    nth_bit);
 206 G_INLINE_FUNC gint      g_bit_nth_msf (gulong  mask,
 207                                        gint    nth_bit);
 208 G_INLINE_FUNC guint     g_bit_storage (gulong  number);
 209
 210 /* Trash Stacks
 211  * elements need to be >= sizeof (gpointer)
 212  */
 213 typedef struct _GTrashStack     GTrashStack;
 214 struct _GTrashStack
 215 {
 216   GTrashStack *next;
 217 };
 218
 219 G_INLINE_FUNC void      g_trash_stack_push      (GTrashStack **stack_p,
 220                                                  gpointer      data_p);
 221 G_INLINE_FUNC gpointer  g_trash_stack_pop       (GTrashStack **stack_p);
 222 G_INLINE_FUNC gpointer  g_trash_stack_peek      (GTrashStack **stack_p);
 223 G_INLINE_FUNC guint     g_trash_stack_height    (GTrashStack **stack_p);
 224
 225 /* inline function implementations
 226  */
 227 #if defined (G_CAN_INLINE) || defined (__G_UTILS_C__)
 228 G_INLINE_FUNC gint
 229 g_bit_nth_lsf (gulong mask,
 230                gint   nth_bit)
 231 {
 232   do
 233     {
 234       nth_bit++;
 235       if (mask & (1 << (gulong) nth_bit))
 236         return nth_bit;
 237     }
 238   while (nth_bit < 31);
 239   return -1;
 240 }
 241 G_INLINE_FUNC gint
 242 g_bit_nth_msf (gulong mask,
 243                gint   nth_bit)
 244 {
 245   if (nth_bit < 0)
 246     nth_bit = GLIB_SIZEOF_LONG * 8;
 247   do
 248     {
 249       nth_bit--;
 250       if (mask & (1 << (gulong) nth_bit))
 251         return nth_bit;
 252     }
 253   while (nth_bit > 0);
 254   return -1;
 255 }
 256 G_INLINE_FUNC guint
 257 g_bit_storage (gulong number)
 258 {
 259   register guint n_bits = 0;
 260
 261   do
 262     {
 263       n_bits++;
 264       number >>= 1;
 265     }
 266   while (number);
 267   return n_bits;
 268 }
 269 G_INLINE_FUNC void
 270 g_trash_stack_push (GTrashStack **stack_p,
 271                     gpointer      data_p)
 272 {
 273   GTrashStack *data = (GTrashStack *) data_p;
 274
 275   data->next = *stack_p;
 276   *stack_p = data;
 277 }
 278 G_INLINE_FUNC gpointer
 279 g_trash_stack_pop (GTrashStack **stack_p)
 280 {
 281   GTrashStack *data;
 282
 283   data = *stack_p;
 284   if (data)
 285     {
 286       *stack_p = data->next;
 287       /* NULLify private pointer here, most platforms store NULL as
 288        * subsequent 0 bytes
 289        */
 290       data->next = NULL;
 291     }
 292
 293   return data;
 294 }
 295 G_INLINE_FUNC gpointer
 296 g_trash_stack_peek (GTrashStack **stack_p)
 297 {
 298   GTrashStack *data;
 299
 300   data = *stack_p;
 301
 302   return data;
 303 }
 304 G_INLINE_FUNC guint
 305 g_trash_stack_height (GTrashStack **stack_p)
 306 {
 307   GTrashStack *data;
 308   guint i = 0;
 309
 310   for (data = *stack_p; data; data = data->next)
 311     i++;
 312
 313   return i;
 314 }
 315 #endif  /* G_CAN_INLINE || __G_UTILS_C__ */
 316
 317 /* Glib version.
 318  * we prefix variable declarations so they can
 319  * properly get exported in windows dlls.
 320  */
 321 GLIB_VAR const guint glib_major_version;
 322 GLIB_VAR const guint glib_minor_version;
 323 GLIB_VAR const guint glib_micro_version;
 324 GLIB_VAR const guint glib_interface_age;
 325 GLIB_VAR const guint glib_binary_age;
 326
 327 #define GLIB_CHECK_VERSION(major,minor,micro)    \
 328     (GLIB_MAJOR_VERSION > (major) || \
 329      (GLIB_MAJOR_VERSION == (major) && GLIB_MINOR_VERSION > (minor)) || \
 330      (GLIB_MAJOR_VERSION == (major) && GLIB_MINOR_VERSION == (minor) && \
 331       GLIB_MICRO_VERSION >= (micro)))
 332
 333 G_END_DECLS
 334
 335 /*
 336  * On Windows, this macro defines a DllMain function that stores the
 337  * actual DLL name that the code being compiled will be included in.
 338  * STATIC should be empty or 'static'. DLL_NAME is the name of the
 339  * (pointer to the) char array where the DLL name will be stored. If
 340  * this is used, you must also include <windows.h>. If you need a more complex
 341  * DLL entry point function, you cannot use this.
 342  *
 343  * On non-Windows platforms, expands to nothing.
 344  */
 345
 346 #ifndef G_PLATFORM_WIN32
 347 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)
 348 #else
 349 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)                    \
 350 static char *dll_name;                                                     \
 351                                                                            \
 352 BOOL WINAPI                                                                \
 353 DllMain (HINSTANCE hinstDLL,                                               \
 354          DWORD     fdwReason,                                              \
 355          LPVOID    lpvReserved)                                            \
 356 {                                                                          \
 357   char bfr[1000];                                                          \
 358   switch (fdwReason)                                                       \
 359     {                                                                      \
 360     case DLL_PROCESS_ATTACH:                                               \
 361       GetModuleFileName ((HMODULE) hinstDLL, bfr, sizeof (bfr));           \
 362       dll_name = g_path_get_basename (bfr);                                \
 363       break;                                                               \
 364     }                                                                      \
 365                                                                            \
 366   return TRUE;                                                             \
 367 }
 368 #endif /* G_PLATFORM_WIN32 */
 369
 370 #endif /* __G_UTILS_H__ */