2 * Include file with general macros and typedefs used through Captive project
3 * Copyright (C) 2002 Jan Kratochvil <project-captive@jankratochvil.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; exactly version 2 of June 1991 is required
9 * This program 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
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #ifndef _CAPTIVE_MACROS_H
21 #define _CAPTIVE_MACROS_H 1
24 #include <glib/gmacros.h>
25 #include <glib/gmem.h>
27 #include <string.h> /* for memset() */
28 #include <glib/galloca.h>
36 * Prevent 'might be used uninitialized' warning.
37 * Macro will fakes the use of the variable as sometimes GCC can't code flow
38 * analyse #C correctly.
42 * g_some_type some_variable CAPTIVE_FAKEUSE;
46 #define CAPTIVE_FAKEUSE =0
51 * @objp: Variable with the pointer to the objects wished to be allocated.
52 * Original value is discarded.
53 * @n: Numbers of objects to be allocated. Value %0 is permitted (%NULL assignment effect).
55 * Macro to allocate @n objects of type *@objp and to assign the resulting pointer to @objp.
56 * Allocated memory may contain garbage.
58 * @Returns: Initialized @objp value as the memory of size #sizeof(typeof(*objp))*n.
59 * Value %NULL is returned iff @n==%0;
61 #define captive_newn(objp,n) ((objp)=g_new(typeof(*(objp)),(n)))
66 * @objp: Variable with the pointer to the objects wished to be allocated and precleared.
67 * Original value is discarded.
68 * @n: Numbers of objects to be allocated. Value %0 is permitted (%NULL assignment effect).
70 * Macro to allocate @n objects of type *@objp and to assign the resulting pointer to @objp.
71 * Allocated memory is precleared.
73 * @Returns: Initialized @objp value as the cleared memory of size #sizeof(typeof(*objp))*n.
74 * Value %NULL is returned iff @n==%0;
76 #define captive_new0n(objp,n) ((objp)=g_new0(typeof(*(objp)),(n)))
81 * @objp: Variable with the pointer to the objects wished to be reallocated.
82 * Value %NULL is permitted (g_malloc() effect).
83 * @n: Numbers of objects to be allocated. Value %0 is permitted (g_free() effect).
85 * Macro to reallocate the original memory stored in @objp
86 * to the size @n objects of type *@objp and to assign the resulting pointer to @objp.
87 * New allocated space may contain garbage. Both @objp and @n can be nonexclusively
90 * @Returns: Initialized @objp value as the memory of size #sizeof(typeof(*objp))*n.
91 * Value %NULL is returned iff @n==%0;
93 #define captive_renewn(objp,n) ({ \
94 typeof(&(objp)) _captive_renewn_objpp=&(objp); \
95 *_captive_renewn_objpp=g_renew(typeof(*(objp)),*_captive_renewn_objpp,(n)); \
96 (*_captive_renewn_objpp); \
102 * @objp: Variable with the pointer to the object wished to be allocated.
103 * Original value is discarded.
105 * Macro to allocate one object of type *@objp and to assign the resulting pointer to @objp.
106 * Allocated memory may contain garbage. Equivalent to captive_newn(objp,1) call.
108 * @Returns: Initialized @objp value as the memory of size #sizeof(typeof(*objp)).
109 * Value %NULL is never returned.
111 #define captive_new(objp) (captive_newn((objp),1))
116 * @objp: Variable with the pointer to the object wished to be allocated and precleared.
117 * Original value is discarded.
119 * Macro to allocate one object of type *@objp and to assign the resulting pointer to @objp.
120 * Allocated memory is precleared. Equivalent to captive_new0n(objp,1) call.
122 * @Returns: Initialized @objp value as the cleared memory of size #sizeof(typeof(*objp)).
123 * Value %NULL is never returned.
125 #define captive_new0(objp) (captive_new0n((objp),1))
129 * captive_newn_alloca:
130 * @objp: Variable with the pointer to the objects wished to be allocated.
131 * Original value is discarded.
132 * @n: Numbers of objects to be allocated. Value %0 is permitted (%NULL assignment effect).
134 * Macro to allocate @n objects of type *@objp and to assign the resulting pointer to @objp.
135 * Allocated memory may contain garbage.
137 * Memory is allocated on the stack frame by g_alloca() and it will be automatically deallocated
138 * during exit of current function (or current block if variable sized variables present there).
139 * You cannot deallocate or reallocate such memory in any other way.
141 * @Returns: Initialized @objp value as the memory of size #sizeof(typeof(*objp))*n.
142 * Value %NULL is returned iff @n==%0;
144 #define captive_newn_alloca(objp,n) ({ \
145 size_t _captive_newn_alloca_n=(n); \
146 /* Fix 'g_alloca(0)!=NULL': */ \
147 ((objp)=(!_captive_newn_alloca_n ? NULL : g_alloca(sizeof(*(objp))*_captive_newn_alloca_n))); \
152 * captive_new0n_alloca:
153 * @objp: Variable with the pointer to the objects wished to be allocated and precleared.
154 * Original value is discarded.
155 * @n: Numbers of objects to be allocated. Value %0 is permitted (%NULL assignment effect).
157 * Macro to allocate @n objects of type *@objp and to assign the resulting pointer to @objp.
158 * Allocated memory is precleared.
160 * Memory is allocated on the stack frame by g_alloca() and it will be automatically deallocated
161 * during exit of current function (or current block if variable sized variables present there).
162 * You cannot deallocate or reallocate such memory in any other way.
164 * @Returns: Initialized @objp value as the cleared memory of size #sizeof(typeof(*objp))*n.
165 * Value %NULL is returned iff @n==%0;
167 #define captive_new0n_alloca(objp,n) ({ \
168 typeof(&(objp)) _captive_new0n_alloca_objpp=&(objp); \
169 captive_newn_alloca(*_captive_new0n_alloca_objpp,(n)); \
170 CAPTIVE_MEMZERO(*_captive_new0n_alloca_objpp); \
171 (*_captive_new0n_alloca_objpp); \
176 * captive_new_alloca:
177 * @objp: Variable with the pointer to the object wished to be allocated.
178 * Original value is discarded.
180 * Macro to allocate one object of type *@objp and to assign the resulting pointer to @objp.
181 * Allocated memory may contain garbage. Equivalent to captive_newn_alloca(objp,1) call.
183 * Memory is allocated on the stack frame by g_alloca() and it will be automatically deallocated
184 * during exit of current function (or current block if variable sized variables present there).
185 * You cannot deallocate or reallocate such memory in any other way.
187 * @Returns: Initialized @objp value as the memory of size #sizeof(typeof(*objp)).
188 * Value %NULL is never returned.
190 #define captive_new_alloca(objp) (captive_newn_alloca((objp),1))
194 * captive_new0_alloca:
195 * @objp: Variable with the pointer to the object wished to be allocated and precleared.
196 * Original value is discarded.
198 * Macro to allocate one object of type *@objp and to assign the resulting pointer to @objp.
199 * Allocated memory is precleared. Equivalent to captive_new0n_alloca(objp,1) call.
201 * @Returns: Initialized @objp value as the cleared memory of size #sizeof(typeof(*objp)).
203 #define captive_new0_alloca(objp) (captive_new0n_alloca((objp),1))
208 * @objp: Variable to be filled from the next argument of @ap.
209 * @ap: Initialized #va_list type.
211 * Automatically determines the size of @objp.
212 * Equivalent to objp=va_arg(ap,typeof(objp)) call.
214 * @Returns: Initialized @objp value.
216 #define captive_va_arg(objp,ap) ((objp)=va_arg((ap),typeof(objp)))
221 * @objp: Pointer to the variable to be cleared.
223 * Clears the sizeof(*@objp) bytes of the given pointer with memset().
224 * Pass _pointer_ to the object to be cleared.
226 #define CAPTIVE_MEMZERO(objp) (memset((objp),0,sizeof(*(objp))))
231 #endif /* _CAPTIVE_MACROS_H */