/* GLIB - Library of useful routines for C programming * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GLib Team and others 1997-2000. See the AUTHORS * file for a list of people on the GLib Team. See the ChangeLog * files for a list of changes. These files are distributed with * GLib at ftp://ftp.gtk.org/pub/gtk/. */ /* This file must not include any other glib header file and must thus * not refer to variables from glibconfig.h */ #ifndef __G_MACROS_H__ #define __G_MACROS_H__ /* We include stddef.h to get the system's definition of NULL */ #include /* Here we provide G_GNUC_EXTENSION as an alias for __extension__, * where this is valid. This allows for warningless compilation of * "long long" types even in the presence of '-ansi -pedantic'. */ #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8) # define G_GNUC_EXTENSION __extension__ #else # define G_GNUC_EXTENSION #endif /* Provide macros to feature the GCC function attribute. */ #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) #define G_GNUC_PURE \ __attribute__((pure)) #else #define G_GNUC_PURE #endif #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4) #define G_GNUC_PRINTF( format_idx, arg_idx ) \ __attribute__((format (printf, format_idx, arg_idx))) #define G_GNUC_SCANF( format_idx, arg_idx ) \ __attribute__((format (scanf, format_idx, arg_idx))) #define G_GNUC_FORMAT( arg_idx ) \ __attribute__((format_arg (arg_idx))) #define G_GNUC_NORETURN \ __attribute__((noreturn)) #define G_GNUC_CONST \ __attribute__((const)) #define G_GNUC_UNUSED \ __attribute__((unused)) #define G_GNUC_NO_INSTRUMENT \ __attribute__((no_instrument_function)) #else /* !__GNUC__ */ #define G_GNUC_PRINTF( format_idx, arg_idx ) #define G_GNUC_SCANF( format_idx, arg_idx ) #define G_GNUC_FORMAT( arg_idx ) #define G_GNUC_NORETURN #define G_GNUC_CONST #define G_GNUC_UNUSED #define G_GNUC_NO_INSTRUMENT #endif /* !__GNUC__ */ /* Wrap the gcc __PRETTY_FUNCTION__ and __FUNCTION__ variables with * macros, so we can refer to them as strings unconditionally. */ #ifdef __GNUC__ #define G_GNUC_FUNCTION __FUNCTION__ #define G_GNUC_PRETTY_FUNCTION __PRETTY_FUNCTION__ #else /* !__GNUC__ */ #define G_GNUC_FUNCTION "" #define G_GNUC_PRETTY_FUNCTION "" #endif /* !__GNUC__ */ #define G_STRINGIFY(macro_or_string) G_STRINGIFY_ARG (macro_or_string) #define G_STRINGIFY_ARG(contents) #contents /* Provide a string identifying the current code position */ #ifdef __GNUC__ # define G_STRLOC __FILE__ ":" G_STRINGIFY (__LINE__) ":" __PRETTY_FUNCTION__ "()" #else # define G_STRLOC __FILE__ ":" G_STRINGIFY (__LINE__) #endif /* Guard C code in headers, while including them from C++ */ #ifdef __cplusplus # define G_BEGIN_DECLS extern "C" { # define G_END_DECLS } #else # define G_BEGIN_DECLS # define G_END_DECLS #endif /* Provide definitions for some commonly used macros. * Some of them are only provided if they haven't already * been defined. It is assumed that if they are already * defined then the current definition is correct. */ #ifndef NULL # ifdef __cplusplus # define NULL (0L) # else /* !__cplusplus */ # define NULL ((void*) 0) # endif /* !__cplusplus */ #endif #ifndef FALSE #define FALSE (0) #endif #ifndef TRUE #define TRUE (!FALSE) #endif #undef MAX #define MAX(a, b) (((a) > (b)) ? (a) : (b)) #undef MIN #define MIN(a, b) (((a) < (b)) ? (a) : (b)) #undef ABS #define ABS(a) (((a) < 0) ? -(a) : (a)) #undef CLAMP #define CLAMP(x, low, high) (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x))) /* Count the number of elements in an array. The array must be defined * as such; using this with a dynamically allocated array will give * incorrect results. */ #define G_N_ELEMENTS(arr) (sizeof (arr) / sizeof ((arr)[0])) /* Macros by analogy to GINT_TO_POINTER, GPOINTER_TO_INT */ #define GPOINTER_TO_SIZE(p) ((gsize) (p)) #define GSIZE_TO_POINTER(s) ((gpointer) (gsize) (s)) /* Provide convenience macros for handling structure * fields through their offsets. */ #define G_STRUCT_OFFSET(struct_type, member) \ ((glong) ((guint8*) &((struct_type*) 0)->member)) #define G_STRUCT_MEMBER_P(struct_p, struct_offset) \ ((gpointer) ((guint8*) (struct_p) + (glong) (struct_offset))) #define G_STRUCT_MEMBER(member_type, struct_p, struct_offset) \ (*(member_type*) G_STRUCT_MEMBER_P ((struct_p), (struct_offset))) /* Provide simple macro statement wrappers (adapted from Perl): * G_STMT_START { statements; } G_STMT_END; * can be used as a single statement, as in * if (x) G_STMT_START { ... } G_STMT_END; else ... * * For gcc we will wrap the statements within `({' and `})' braces. * For SunOS they will be wrapped within `if (1)' and `else (void) 0', * and otherwise within `do' and `while (0)'. */ #if !(defined (G_STMT_START) && defined (G_STMT_END)) # if defined (__GNUC__) && !defined (__STRICT_ANSI__) && !defined (__cplusplus) # define G_STMT_START (void)( # define G_STMT_END ) # else # if (defined (sun) || defined (__sun__)) # define G_STMT_START if (1) # define G_STMT_END else (void)0 # else # define G_STMT_START do # define G_STMT_END while (0) # endif # endif #endif /* Allow the app programmer to select whether or not return values * (usually char*) are const or not. Don't try using this feature for * functions with C++ linkage. */ #ifdef G_DISABLE_CONST_RETURNS #define G_CONST_RETURN #else #define G_CONST_RETURN const #endif #endif /* __G_MACROS_H__ */