lib/dpkg/nfmalloc.c

   1 /*
   2  * libdpkg - Debian packaging suite library routines
   3  * nfmalloc.c - non-freeing malloc, used for in-core database
   4  *
   5  * Copyright © 1994,1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
   6  *
   7  * This is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <compat.h>
  23
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include <obstack.h>
  27
  28 #include <dpkg/i18n.h>
  29 #include <dpkg/dpkg.h>
  30 #include <dpkg/dpkg-db.h>
  31
  32 #define obstack_chunk_alloc m_malloc
  33 #define obstack_chunk_free free
  34
  35 static struct obstack db_obs;
  36 static bool dbobs_init = false;
  37
  38 /* We use lots of mem, so use a large chunk. */
  39 #define CHUNK_SIZE 8192
  40
  41 #define OBSTACK_INIT do { if (!dbobs_init) { nfobstack_init(); } } while (0)
  42
  43 static void nfobstack_init(void) {
  44   obstack_init(&db_obs);
  45   dbobs_init = true;
  46   obstack_chunk_size(&db_obs) = CHUNK_SIZE;
  47 }
  48
  49 void *
  50 nfmalloc(size_t size)
  51 {
  52   OBSTACK_INIT;
  53   /* cppcheck-suppress[nullPointerArithmetic]:
  54    * False positive, imported module. */
  55   return obstack_alloc(&db_obs, size);
  56 }
  57
  58 char *nfstrsave(const char *string) {
  59   OBSTACK_INIT;
  60   /* cppcheck-suppress[nullPointerArithmetic]:
  61    * False positive, imported module. */
  62   return obstack_copy0 (&db_obs, string, strlen(string));
  63 }
  64
  65 char *
  66 nfstrnsave(const char *string, size_t size)
  67 {
  68   OBSTACK_INIT;
  69   /* cppcheck-suppress[nullPointerArithmetic]:
  70    * False positive, imported module. */
  71   return obstack_copy0(&db_obs, string, size);
  72 }
  73
  74 void nffreeall(void) {
  75   if (dbobs_init) {
  76     /* cppcheck-suppress[nullPointerArithmetic,pointerLessThanZero]:
  77      * False positive, imported module. */
  78     obstack_free(&db_obs, NULL);
  79     dbobs_init = false;
  80   }
  81 }