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/*
* 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;
}
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