2 This file is part of GNUnet.
3 (C) 2001, 2002, 2003, 2005, 2006 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file util/common_allocation.c
23 * @brief wrapper around malloc/free
24 * @author Christian Grothoff
28 #include "gnunet_common.h"
30 #define LOG(kind,...) GNUNET_log_from (kind, "util",__VA_ARGS__)
32 #define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util", syscall)
35 #define INT_MAX 0x7FFFFFFF
39 #define W32_MEM_LIMIT 200000000
43 static LONG mem_used = 0;
47 * Allocate memory. Checks the return value, aborts if no more
48 * memory is available.
50 * @param size how many bytes of memory to allocate, do NOT use
51 * this function (or GNUNET_malloc) to allocate more than several MB
52 * of memory, if you are possibly needing a very large chunk use
53 * GNUNET_xmalloc_unchecked_ instead.
54 * @param filename where in the code was the call to GNUNET_malloc
55 * @param linenumber where in the code was the call to GNUNET_malloc
56 * @return pointer to size bytes of memory
59 GNUNET_xmalloc_ (size_t size, const char *filename, int linenumber)
63 /* As a security precaution, we generally do not allow very large
64 * allocations using the default 'GNUNET_malloc' macro */
65 GNUNET_assert_at (size <= GNUNET_MAX_MALLOC_CHECKED, filename, linenumber);
66 ret = GNUNET_xmalloc_unchecked_ (size, filename, linenumber);
69 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "malloc");
77 * Allocate and initialize memory. Checks the return value, aborts if no more
78 * memory is available. Don't use GNUNET_xmemdup_ directly. Use the
79 * GNUNET_memdup macro.
81 * @param buf buffer to initialize from (must contain size bytes)
82 * @param size number of bytes to allocate
83 * @param filename where is this call being made (for debugging)
84 * @param linenumber line where this call is being made (for debugging)
85 * @return allocated memory, never NULL
88 GNUNET_xmemdup_ (const void *buf, size_t size, const char *filename,
93 /* As a security precaution, we generally do not allow very large
95 GNUNET_assert_at (size <= GNUNET_MAX_MALLOC_CHECKED, filename, linenumber);
97 size += sizeof (size_t);
98 if (mem_used + size > W32_MEM_LIMIT)
101 GNUNET_assert_at (size < INT_MAX, filename, linenumber);
105 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "malloc");
109 *((size_t *) ret) = size;
110 ret = &((size_t *) ret)[1];
113 memcpy (ret, buf, size);
120 * Wrapper around malloc. Allocates size bytes of memory.
121 * The memory will be zero'ed out.
123 * @param size the number of bytes to allocate
124 * @param filename where in the code was the call to GNUNET_malloc_large
125 * @param linenumber where in the code was the call to GNUNET_malloc_large
126 * @return pointer to size bytes of memory, NULL if we do not have enough memory
129 GNUNET_xmalloc_unchecked_ (size_t size, const char *filename, int linenumber)
134 size += sizeof (size_t);
135 if (mem_used + size > W32_MEM_LIMIT)
139 result = malloc (size);
142 memset (result, 0, size);
145 *((size_t *) result) = size;
146 result = &((size_t *) result)[1];
155 * Reallocate memory. Checks the return value, aborts if no more
156 * memory is available.
158 * @param ptr the pointer to reallocate
159 * @param n how many bytes of memory to allocate
160 * @param filename where in the code was the call to GNUNET_realloc
161 * @param linenumber where in the code was the call to GNUNET_realloc
162 * @return pointer to size bytes of memory
165 GNUNET_xrealloc_ (void *ptr, size_t n, const char *filename, int linenumber)
168 n += sizeof (size_t);
169 ptr = &((size_t *) ptr)[-1];
170 mem_used = mem_used - *((size_t *) ptr) + n;
172 ptr = realloc (ptr, n);
173 if ((NULL == ptr) && (n > 0))
175 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "realloc");
179 ptr = &((size_t *) ptr)[1];
185 # if __BYTE_ORDER == __LITTLE_ENDIAN
186 #define BAADFOOD_STR "\x0D\xF0\xAD\xBA"
188 # if __BYTE_ORDER == __BIG_ENDIAN
189 #define BAADFOOD_STR "\xBA\xAD\xF0\x0D"
193 #define MSIZE(p) _msize (p)
196 /* FIXME: manpage claims that this function is a GNU extension,
197 * but googling shows that it is available on many platforms via
198 * inclusion of various headers. For now let's make it Linux-only.
200 #define MSIZE(p) malloc_usable_size (p)
204 * Free memory. Merely a wrapper for the case that we
205 * want to keep track of allocations.
207 * @param ptr the pointer to free
208 * @param filename where in the code was the call to GNUNET_array_grow
209 * @param linenumber where in the code was the call to GNUNET_array_grow
212 GNUNET_xfree_ (void *ptr, const char *filename, int linenumber)
214 GNUNET_assert_at (ptr != NULL, filename, linenumber);
216 ptr = &((size_t *) ptr)[-1];
217 mem_used -= *((size_t *) ptr);
223 char baadfood[5] = BAADFOOD_STR;
224 size_t s = MSIZE (ptr);
225 for (i = 0; i < s; i++)
226 ((char *) ptr)[i] = baadfood[i % 4];
234 * Dup a string (same semantics as strdup).
236 * @param str the string to dup
237 * @param filename where in the code was the call to GNUNET_strdup
238 * @param linenumber where in the code was the call to GNUNET_strdup
239 * @return strdup(str)
242 GNUNET_xstrdup_ (const char *str, const char *filename, int linenumber)
246 GNUNET_assert_at (str != NULL, filename, linenumber);
247 res = GNUNET_xmalloc_ (strlen (str) + 1, filename, linenumber);
248 memcpy (res, str, strlen (str) + 1);
254 * Dup partially a string (same semantics as strndup).
256 * @param str the string to dup
257 * @param len the length of the string to dup
258 * @param filename where in the code was the call to GNUNET_strndup
259 * @param linenumber where in the code was the call to GNUNET_strndup
260 * @return strndup(str,len)
263 GNUNET_xstrndup_ (const char *str, size_t len, const char *filename,
268 GNUNET_assert_at (str != NULL, filename, linenumber);
269 len = GNUNET_MIN (len, strlen (str));
270 res = GNUNET_xmalloc_ (len + 1, filename, linenumber);
271 memcpy (res, str, len);
272 /* res[len] = '\0'; 'malloc' zeros out anyway */
278 * Grow an array. Grows old by (*oldCount-newCount)*elementSize bytes
279 * and sets *oldCount to newCount.
281 * @param old address of the pointer to the array
283 * @param elementSize the size of the elements of the array
284 * @param oldCount address of the number of elements in the *old array
285 * @param newCount number of elements in the new array, may be 0
286 * @param filename where in the code was the call to GNUNET_array_grow
287 * @param linenumber where in the code was the call to GNUNET_array_grow
290 GNUNET_xgrow_ (void **old, size_t elementSize, unsigned int *oldCount,
291 unsigned int newCount, const char *filename, int linenumber)
296 GNUNET_assert_at (INT_MAX / elementSize > newCount, filename, linenumber);
297 size = newCount * elementSize;
304 tmp = GNUNET_xmalloc_ (size, filename, linenumber);
305 memset (tmp, 0, size); /* client code should not rely on this, though... */
306 if (*oldCount > newCount)
307 *oldCount = newCount; /* shrink is also allowed! */
308 memcpy (tmp, *old, elementSize * (*oldCount));
313 GNUNET_xfree_ (*old, filename, linenumber);
316 *oldCount = newCount;
321 * Like asprintf, just portable.
323 * @param buf set to a buffer of sufficient size (allocated, caller must free)
324 * @param format format string (see printf, fprintf, etc.)
325 * @param ... data for format string
326 * @return number of bytes in "*buf" excluding 0-termination
329 GNUNET_asprintf (char **buf, const char *format, ...)
334 va_start (args, format);
335 ret = VSNPRINTF (NULL, 0, format, args);
337 *buf = GNUNET_malloc (ret + 1);
338 va_start (args, format);
339 ret = VSPRINTF (*buf, format, args);
346 * Like snprintf, just aborts if the buffer is of insufficient size.
348 * @param buf pointer to buffer that is written to
349 * @param size number of bytes in buf
350 * @param format format strings
351 * @param ... data for format string
352 * @return number of bytes written to buf or negative value on error
355 GNUNET_snprintf (char *buf, size_t size, const char *format, ...)
360 va_start (args, format);
361 ret = VSNPRINTF (buf, size, format, args);
363 GNUNET_assert (ret <= size);
369 * Create a copy of the given message.
371 * @param msg message to copy
372 * @return duplicate of the message
374 struct GNUNET_MessageHeader *
375 GNUNET_copy_message (const struct GNUNET_MessageHeader *msg)
377 struct GNUNET_MessageHeader *ret;
380 msize = ntohs (msg->size);
381 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
382 ret = GNUNET_malloc (msize);
383 memcpy (ret, msg, msize);
388 /* end of common_allocation.c */