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
27 #include "gnunet_common.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "util",__VA_ARGS__)
34 #define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util", syscall)
37 #define INT_MAX 0x7FFFFFFF
41 #define W32_MEM_LIMIT 200000000
45 static LONG mem_used = 0;
49 * Allocate memory. Checks the return value, aborts if no more
50 * memory is available.
52 * @param size how many bytes of memory to allocate, do NOT use
53 * this function (or GNUNET_malloc) to allocate more than several MB
54 * of memory, if you are possibly needing a very large chunk use
55 * GNUNET_xmalloc_unchecked_ instead.
56 * @param filename where in the code was the call to GNUNET_malloc
57 * @param linenumber where in the code was the call to GNUNET_malloc
58 * @return pointer to size bytes of memory
61 GNUNET_xmalloc_ (size_t size, const char *filename, int linenumber)
65 /* As a security precaution, we generally do not allow very large
66 * allocations using the default 'GNUNET_malloc' macro */
67 GNUNET_assert_at (size <= GNUNET_MAX_MALLOC_CHECKED, filename, linenumber);
68 ret = GNUNET_xmalloc_unchecked_ (size, filename, linenumber);
71 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "malloc");
79 * Allocate and initialize memory. Checks the return value, aborts if no more
80 * memory is available. Don't use GNUNET_xmemdup_ directly. Use the
81 * GNUNET_memdup macro.
83 * @param buf buffer to initialize from (must contain size bytes)
84 * @param size number of bytes to allocate
85 * @param filename where is this call being made (for debugging)
86 * @param linenumber line where this call is being made (for debugging)
87 * @return allocated memory, never NULL
90 GNUNET_xmemdup_ (const void *buf, size_t size, const char *filename,
95 /* As a security precaution, we generally do not allow very large
97 GNUNET_assert_at (size <= GNUNET_MAX_MALLOC_CHECKED, filename, linenumber);
99 size += sizeof (size_t);
100 if (mem_used + size > W32_MEM_LIMIT)
103 GNUNET_assert_at (size < INT_MAX, filename, linenumber);
107 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "malloc");
111 *((size_t *) ret) = size;
112 ret = &((size_t *) ret)[1];
115 memcpy (ret, buf, size);
122 * Wrapper around malloc. Allocates size bytes of memory.
123 * The memory will be zero'ed out.
125 * @param size the number of bytes to allocate
126 * @param filename where in the code was the call to GNUNET_malloc_large
127 * @param linenumber where in the code was the call to GNUNET_malloc_large
128 * @return pointer to size bytes of memory, NULL if we do not have enough memory
131 GNUNET_xmalloc_unchecked_ (size_t size, const char *filename, int linenumber)
136 size += sizeof (size_t);
137 if (mem_used + size > W32_MEM_LIMIT)
141 result = malloc (size);
144 memset (result, 0, size);
147 *((size_t *) result) = size;
148 result = &((size_t *) result)[1];
157 * Reallocate memory. Checks the return value, aborts if no more
158 * memory is available.
160 * @param ptr the pointer to reallocate
161 * @param n how many bytes of memory to allocate
162 * @param filename where in the code was the call to GNUNET_realloc
163 * @param linenumber where in the code was the call to GNUNET_realloc
164 * @return pointer to size bytes of memory
167 GNUNET_xrealloc_ (void *ptr, size_t n, const char *filename, int linenumber)
170 n += sizeof (size_t);
171 ptr = &((size_t *) ptr)[-1];
172 mem_used = mem_used - *((size_t *) ptr) + n;
174 ptr = realloc (ptr, n);
175 if ((NULL == ptr) && (n > 0))
177 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "realloc");
181 ptr = &((size_t *) ptr)[1];
187 # if __BYTE_ORDER == __LITTLE_ENDIAN
188 #define BAADFOOD_STR "\x0D\xF0\xAD\xBA"
190 # if __BYTE_ORDER == __BIG_ENDIAN
191 #define BAADFOOD_STR "\xBA\xAD\xF0\x0D"
195 #define MSIZE(p) _msize (p)
197 #if HAVE_MALLOC_USABLE_SIZE
198 #define MSIZE(p) malloc_usable_size (p)
202 * Free memory. Merely a wrapper for the case that we
203 * want to keep track of allocations.
205 * @param ptr the pointer to free
206 * @param filename where in the code was the call to GNUNET_array_grow
207 * @param linenumber where in the code was the call to GNUNET_array_grow
210 GNUNET_xfree_ (void *ptr, const char *filename, int linenumber)
212 GNUNET_assert_at (ptr != NULL, filename, linenumber);
214 ptr = &((size_t *) ptr)[-1];
215 mem_used -= *((size_t *) ptr);
221 char baadfood[5] = BAADFOOD_STR;
222 size_t s = MSIZE (ptr);
223 for (i = 0; i < s; i++)
224 ((char *) ptr)[i] = baadfood[i % 4];
232 * Dup a string (same semantics as strdup).
234 * @param str the string to dup
235 * @param filename where in the code was the call to GNUNET_strdup
236 * @param linenumber where in the code was the call to GNUNET_strdup
237 * @return strdup(str)
240 GNUNET_xstrdup_ (const char *str, const char *filename, int linenumber)
244 GNUNET_assert_at (str != NULL, filename, linenumber);
245 res = GNUNET_xmalloc_ (strlen (str) + 1, filename, linenumber);
246 memcpy (res, str, strlen (str) + 1);
252 * Dup partially a string (same semantics as strndup).
254 * @param str the string to dup
255 * @param len the length of the string to dup
256 * @param filename where in the code was the call to GNUNET_strndup
257 * @param linenumber where in the code was the call to GNUNET_strndup
258 * @return strndup(str,len)
261 GNUNET_xstrndup_ (const char *str, size_t len, const char *filename,
266 GNUNET_assert_at (str != NULL, filename, linenumber);
267 len = GNUNET_MIN (len, strlen (str));
268 res = GNUNET_xmalloc_ (len + 1, filename, linenumber);
269 memcpy (res, str, len);
270 /* res[len] = '\0'; 'malloc' zeros out anyway */
276 * Grow an array. Grows old by (*oldCount-newCount)*elementSize bytes
277 * and sets *oldCount to newCount.
279 * @param old address of the pointer to the array
281 * @param elementSize the size of the elements of the array
282 * @param oldCount address of the number of elements in the *old array
283 * @param newCount number of elements in the new array, may be 0
284 * @param filename where in the code was the call to GNUNET_array_grow
285 * @param linenumber where in the code was the call to GNUNET_array_grow
288 GNUNET_xgrow_ (void **old, size_t elementSize, unsigned int *oldCount,
289 unsigned int newCount, const char *filename, int linenumber)
294 GNUNET_assert_at (INT_MAX / elementSize > newCount, filename, linenumber);
295 size = newCount * elementSize;
302 tmp = GNUNET_xmalloc_ (size, filename, linenumber);
303 memset (tmp, 0, size); /* client code should not rely on this, though... */
304 if (*oldCount > newCount)
305 *oldCount = newCount; /* shrink is also allowed! */
306 memcpy (tmp, *old, elementSize * (*oldCount));
311 GNUNET_xfree_ (*old, filename, linenumber);
314 *oldCount = newCount;
319 * Like asprintf, just portable.
321 * @param buf set to a buffer of sufficient size (allocated, caller must free)
322 * @param format format string (see printf, fprintf, etc.)
323 * @param ... data for format string
324 * @return number of bytes in "*buf" excluding 0-termination
327 GNUNET_asprintf (char **buf, const char *format, ...)
332 va_start (args, format);
333 ret = VSNPRINTF (NULL, 0, format, args);
335 *buf = GNUNET_malloc (ret + 1);
336 va_start (args, format);
337 ret = VSPRINTF (*buf, format, args);
344 * Like snprintf, just aborts if the buffer is of insufficient size.
346 * @param buf pointer to buffer that is written to
347 * @param size number of bytes in buf
348 * @param format format strings
349 * @param ... data for format string
350 * @return number of bytes written to buf or negative value on error
353 GNUNET_snprintf (char *buf, size_t size, const char *format, ...)
358 va_start (args, format);
359 ret = VSNPRINTF (buf, size, format, args);
361 GNUNET_assert (ret <= size);
367 * Create a copy of the given message.
369 * @param msg message to copy
370 * @return duplicate of the message
372 struct GNUNET_MessageHeader *
373 GNUNET_copy_message (const struct GNUNET_MessageHeader *msg)
375 struct GNUNET_MessageHeader *ret;
378 msize = ntohs (msg->size);
379 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
380 ret = GNUNET_malloc (msize);
381 memcpy (ret, msg, msize);
386 /* end of common_allocation.c */