1 files changed, 91 insertions, 0 deletions
diff --git a/lib/nfmalloc.c b/lib/nfmalloc.c
new file mode 100644
index 000000000..225e69846
--- /dev/null
+++ b/lib/nfmalloc.c
@@ -0,0 +1,91 @@
+/*
+ * libdpkg - Debian packaging suite library routines
+ * nfmalloc.c - non-freeing malloc, used for in-core database
+ *
+ * Copyright (C) 1994,1995 Ian Jackson <iwj10@cus.cam.ac.uk>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with dpkg; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "config.h"
+#include "dpkg.h"
+#include "dpkg-db.h"
+
+#define ABLOCKSIZE 65536
+#define UNIQUE      4096
+
+union maxalign {
+  long l; long double d;
+  void *pv; char *pc; union maxalign *ps; void (*pf)(void);
+};
+
+static unsigned char *playground= 0;
+static long remaining= 0;
+static struct piece { struct piece *next; union maxalign space; } *pieces= 0;
+
+void nffreeall(void) {
+  struct piece *a,*b;
+  for (a=pieces; a; a=b) { b=a->next; free(a); }
+  pieces= 0; remaining= 0;
+}
+
+static void *nfmalloc_sysmalloc(size_t size) {
+  struct piece *alc;
+  alc= m_malloc(size + sizeof(struct piece));
+  alc->next= pieces; pieces= alc;
+  return &alc->space;
+}
+
+#ifndef MDEBUG
+void *nfmalloc(size_t size) {
+#else
+static void *nfmalloc_r(size_t size) {
+#endif
+  const size_t alignment= sizeof(union maxalign);
+
+  size -= (size + alignment-1) % alignment;
+  size += alignment-1;
+  if (size > UNIQUE) return nfmalloc_sysmalloc(size);
+  remaining -= size;
+  if (remaining > 0) return playground -= size;
+  playground= (unsigned char*)nfmalloc_sysmalloc(ABLOCKSIZE) + ABLOCKSIZE - size;
+  remaining= ABLOCKSIZE-size;
+  return playground;
+}
+
+#ifdef MDEBUG
+/* If we haven't switched off debugging we wrap nfmalloc in something
+ * that fills the space with junk that may tell us what happened if
+ * we dereference a wild pointer.  It's better than leaving it full of
+ * nulls, anyway.
+ */
+void *nfmalloc(size_t size) {
+  unsigned short *r, *r2, x;
+  r= nfmalloc_r(size); r2=r; x= (unsigned short)size;
+  while (size >= 2) { *r2++= x; size -= 2; }
+  return r;
+}
+#endif
+
+char *nfstrsave(const char *string) {
+  char *r;
+  
+  r= nfmalloc(strlen(string)+1);
+  strcpy(r,string);
+  return r;
+}