1 /**
2 * \file imports.c
3 * Standard C library function wrappers.
4 *
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,
8 * etc.
9 *
10 * Some drivers will want to override/replace this file with something
11 * specialized, but that'll be rare.
12 *
13 * Eventually, I want to move roll the glheader.h file into this.
14 *
15 * \todo Functions still needed:
16 * - scanf
17 * - qsort
18 * - rand and RAND_MAX
19 */
20
21 /*
22 * Mesa 3-D graphics library
23 *
24 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
25 *
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:
32 *
33 * The above copyright notice and this permission notice shall be included
34 * in all copies or substantial portions of the Software.
35 *
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.
43 */
44
45 #include <stdio.h>
46 #include <stdarg.h>
47 #include "c99_math.h"
48 #include "util/rounding.h" /* for _mesa_roundeven */
49 #include "imports.h"
50 #include "context.h"
51 #include "mtypes.h"
52 #include "version.h"
53
54 #ifdef _GNU_SOURCE
55 #include <locale.h>
56 #ifdef __APPLE__
57 #include <xlocale.h>
58 #endif
59 #endif
60
61
62 #ifdef _WIN32
63 #define vsnprintf _vsnprintf
64 #elif defined(__IBMC__) || defined(__IBMCPP__)
65 extern int vsnprintf(char *str, size_t count, const char *fmt, va_list arg);
66 #endif
67
68 /**********************************************************************/
69 /** \name Memory */
70 /*@{*/
71
72 /**
73 * Allocate aligned memory.
74 *
75 * \param bytes number of bytes to allocate.
76 * \param alignment alignment (must be greater than zero).
77 *
78 * Allocates extra memory to accommodate rounding up the address for
79 * alignment and to record the real malloc address.
80 *
81 * \sa _mesa_align_free().
82 */
83 void *
_mesa_align_malloc(size_t bytes,unsigned long alignment)84 _mesa_align_malloc(size_t bytes, unsigned long alignment)
85 {
86 #if defined(HAVE_POSIX_MEMALIGN)
87 void *mem;
88 int err = posix_memalign(& mem, alignment, bytes);
89 if (err)
90 return NULL;
91 return mem;
92 #elif defined(_WIN32)
93 return _aligned_malloc(bytes, alignment);
94 #else
95 uintptr_t ptr, buf;
96
97 assert( alignment > 0 );
98
99 ptr = (uintptr_t)malloc(bytes + alignment + sizeof(void *));
100 if (!ptr)
101 return NULL;
102
103 buf = (ptr + alignment + sizeof(void *)) & ~(uintptr_t)(alignment - 1);
104 *(uintptr_t *)(buf - sizeof(void *)) = ptr;
105
106 #ifdef DEBUG
107 /* mark the non-aligned area */
108 while ( ptr < buf - sizeof(void *) ) {
109 *(unsigned long *)ptr = 0xcdcdcdcd;
110 ptr += sizeof(unsigned long);
111 }
112 #endif
113
114 return (void *) buf;
115 #endif /* defined(HAVE_POSIX_MEMALIGN) */
116 }
117
118 /**
119 * Same as _mesa_align_malloc(), but using calloc(1, ) instead of
120 * malloc()
121 */
122 void *
_mesa_align_calloc(size_t bytes,unsigned long alignment)123 _mesa_align_calloc(size_t bytes, unsigned long alignment)
124 {
125 #if defined(HAVE_POSIX_MEMALIGN)
126 void *mem;
127
128 mem = _mesa_align_malloc(bytes, alignment);
129 if (mem != NULL) {
130 (void) memset(mem, 0, bytes);
131 }
132
133 return mem;
134 #elif defined(_WIN32)
135 void *mem;
136
137 mem = _aligned_malloc(bytes, alignment);
138 if (mem != NULL) {
139 (void) memset(mem, 0, bytes);
140 }
141
142 return mem;
143 #else
144 uintptr_t ptr, buf;
145
146 assert( alignment > 0 );
147
148 ptr = (uintptr_t)calloc(1, bytes + alignment + sizeof(void *));
149 if (!ptr)
150 return NULL;
151
152 buf = (ptr + alignment + sizeof(void *)) & ~(uintptr_t)(alignment - 1);
153 *(uintptr_t *)(buf - sizeof(void *)) = ptr;
154
155 #ifdef DEBUG
156 /* mark the non-aligned area */
157 while ( ptr < buf - sizeof(void *) ) {
158 *(unsigned long *)ptr = 0xcdcdcdcd;
159 ptr += sizeof(unsigned long);
160 }
161 #endif
162
163 return (void *)buf;
164 #endif /* defined(HAVE_POSIX_MEMALIGN) */
165 }
166
167 /**
168 * Free memory which was allocated with either _mesa_align_malloc()
169 * or _mesa_align_calloc().
170 * \param ptr pointer to the memory to be freed.
171 * The actual address to free is stored in the word immediately before the
172 * address the client sees.
173 * Note that it is legal to pass NULL pointer to this function and will be
174 * handled accordingly.
175 */
176 void
_mesa_align_free(void * ptr)177 _mesa_align_free(void *ptr)
178 {
179 #if defined(HAVE_POSIX_MEMALIGN)
180 free(ptr);
181 #elif defined(_WIN32)
182 _aligned_free(ptr);
183 #else
184 if (ptr) {
185 void **cubbyHole = (void **) ((char *) ptr - sizeof(void *));
186 void *realAddr = *cubbyHole;
187 free(realAddr);
188 }
189 #endif /* defined(HAVE_POSIX_MEMALIGN) */
190 }
191
192 /**
193 * Reallocate memory, with alignment.
194 */
195 void *
_mesa_align_realloc(void * oldBuffer,size_t oldSize,size_t newSize,unsigned long alignment)196 _mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
197 unsigned long alignment)
198 {
199 #if defined(_WIN32)
200 (void) oldSize;
201 return _aligned_realloc(oldBuffer, newSize, alignment);
202 #else
203 const size_t copySize = (oldSize < newSize) ? oldSize : newSize;
204 void *newBuf = _mesa_align_malloc(newSize, alignment);
205 if (newBuf && oldBuffer && copySize > 0) {
206 memcpy(newBuf, oldBuffer, copySize);
207 }
208
209 _mesa_align_free(oldBuffer);
210 return newBuf;
211 #endif
212 }
213
214 /*@}*/
215
216
217 /**********************************************************************/
218 /** \name Math */
219 /*@{*/
220
221
222 #ifndef HAVE___BUILTIN_POPCOUNT
223 /**
224 * Return number of bits set in given GLuint.
225 */
226 unsigned int
_mesa_bitcount(unsigned int n)227 _mesa_bitcount(unsigned int n)
228 {
229 unsigned int bits;
230 for (bits = 0; n > 0; n = n >> 1) {
231 bits += (n & 1);
232 }
233 return bits;
234 }
235 #endif
236
237 #ifndef HAVE___BUILTIN_POPCOUNTLL
238 /**
239 * Return number of bits set in given 64-bit uint.
240 */
241 unsigned int
_mesa_bitcount_64(uint64_t n)242 _mesa_bitcount_64(uint64_t n)
243 {
244 unsigned int bits;
245 for (bits = 0; n > 0; n = n >> 1) {
246 bits += (n & 1);
247 }
248 return bits;
249 }
250 #endif
251
252 /*@}*/
253
254
255 /** Needed due to #ifdef's, above. */
256 int
_mesa_vsnprintf(char * str,size_t size,const char * fmt,va_list args)257 _mesa_vsnprintf(char *str, size_t size, const char *fmt, va_list args)
258 {
259 return vsnprintf( str, size, fmt, args);
260 }
261
262 /** Wrapper around vsnprintf() */
263 int
_mesa_snprintf(char * str,size_t size,const char * fmt,...)264 _mesa_snprintf( char *str, size_t size, const char *fmt, ... )
265 {
266 int r;
267 va_list args;
268 va_start( args, fmt );
269 r = vsnprintf( str, size, fmt, args );
270 va_end( args );
271 return r;
272 }
273
274
275