3 * Standard C library function wrappers.
5 * Imports are services which the device driver or window system or
6 * operating system provides to the core renderer. The core renderer (Mesa)
7 * will call these functions in order to do memory allocation, simple I/O,
10 * Some drivers will want to override/replace this file with something
11 * specialized, but that'll be rare.
13 * Eventually, I want to move roll the glheader.h file into this.
15 * \todo Functions still needed:
22 * Mesa 3-D graphics library
24 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
26 * Permission is hereby granted, free of charge, to any person obtaining a
27 * copy of this software and associated documentation files (the "Software"),
28 * to deal in the Software without restriction, including without limitation
29 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
30 * and/or sell copies of the Software, and to permit persons to whom the
31 * Software is furnished to do so, subject to the following conditions:
33 * The above copyright notice and this permission notice shall be included
34 * in all copies or substantial portions of the Software.
36 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
37 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
38 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
39 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
40 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
41 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
42 * OTHER DEALINGS IN THE SOFTWARE.
61 #define vsnprintf _vsnprintf
62 #elif defined(__IBMC__) || defined(__IBMCPP__)
63 extern int vsnprintf(char *str
, size_t count
, const char *fmt
, va_list arg
);
66 /**********************************************************************/
71 * Allocate aligned memory.
73 * \param bytes number of bytes to allocate.
74 * \param alignment alignment (must be greater than zero).
76 * Allocates extra memory to accommodate rounding up the address for
77 * alignment and to record the real malloc address.
79 * \sa _mesa_align_free().
82 _mesa_align_malloc(size_t bytes
, unsigned long alignment
)
84 #if defined(HAVE_POSIX_MEMALIGN)
86 int err
= posix_memalign(& mem
, alignment
, bytes
);
91 return _aligned_malloc(bytes
, alignment
);
95 assert( alignment
> 0 );
97 ptr
= (uintptr_t)malloc(bytes
+ alignment
+ sizeof(void *));
101 buf
= (ptr
+ alignment
+ sizeof(void *)) & ~(uintptr_t)(alignment
- 1);
102 *(uintptr_t *)(buf
- sizeof(void *)) = ptr
;
105 /* mark the non-aligned area */
106 while ( ptr
< buf
- sizeof(void *) ) {
107 *(unsigned long *)ptr
= 0xcdcdcdcd;
108 ptr
+= sizeof(unsigned long);
113 #endif /* defined(HAVE_POSIX_MEMALIGN) */
117 * Same as _mesa_align_malloc(), but using calloc(1, ) instead of
121 _mesa_align_calloc(size_t bytes
, unsigned long alignment
)
123 #if defined(HAVE_POSIX_MEMALIGN)
126 mem
= _mesa_align_malloc(bytes
, alignment
);
128 (void) memset(mem
, 0, bytes
);
132 #elif defined(_WIN32)
135 mem
= _aligned_malloc(bytes
, alignment
);
137 (void) memset(mem
, 0, bytes
);
144 assert( alignment
> 0 );
146 ptr
= (uintptr_t)calloc(1, bytes
+ alignment
+ sizeof(void *));
150 buf
= (ptr
+ alignment
+ sizeof(void *)) & ~(uintptr_t)(alignment
- 1);
151 *(uintptr_t *)(buf
- sizeof(void *)) = ptr
;
154 /* mark the non-aligned area */
155 while ( ptr
< buf
- sizeof(void *) ) {
156 *(unsigned long *)ptr
= 0xcdcdcdcd;
157 ptr
+= sizeof(unsigned long);
162 #endif /* defined(HAVE_POSIX_MEMALIGN) */
166 * Free memory which was allocated with either _mesa_align_malloc()
167 * or _mesa_align_calloc().
168 * \param ptr pointer to the memory to be freed.
169 * The actual address to free is stored in the word immediately before the
170 * address the client sees.
171 * Note that it is legal to pass NULL pointer to this function and will be
172 * handled accordingly.
175 _mesa_align_free(void *ptr
)
177 #if defined(HAVE_POSIX_MEMALIGN)
179 #elif defined(_WIN32)
183 void **cubbyHole
= (void **) ((char *) ptr
- sizeof(void *));
184 void *realAddr
= *cubbyHole
;
187 #endif /* defined(HAVE_POSIX_MEMALIGN) */
191 * Reallocate memory, with alignment.
194 _mesa_align_realloc(void *oldBuffer
, size_t oldSize
, size_t newSize
,
195 unsigned long alignment
)
199 return _aligned_realloc(oldBuffer
, newSize
, alignment
);
201 const size_t copySize
= (oldSize
< newSize
) ? oldSize
: newSize
;
202 void *newBuf
= _mesa_align_malloc(newSize
, alignment
);
203 if (newBuf
&& oldBuffer
&& copySize
> 0) {
204 memcpy(newBuf
, oldBuffer
, copySize
);
207 _mesa_align_free(oldBuffer
);
215 /** Needed due to #ifdef's, above. */
217 _mesa_vsnprintf(char *str
, size_t size
, const char *fmt
, va_list args
)
219 return vsnprintf( str
, size
, fmt
, args
);
222 /** Wrapper around vsnprintf() */
224 _mesa_snprintf( char *str
, size_t size
, const char *fmt
, ... )
228 va_start( args
, fmt
);
229 r
= vsnprintf( str
, size
, fmt
, args
);