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The Datafile PD-CD 1 Issue 2
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PDCD-1 - Issue 02.iso
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_utilities
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utilities
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003
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_gs
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!GS
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c
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GSMISC
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1991-10-26
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/* Copyright (C) 1989, 1991 Aladdin Enterprises. All rights reserved.
Distributed by Free Software Foundation, Inc.
This file is part of Ghostscript.
Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing. Refer
to the Ghostscript General Public License for full details.
Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License. A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities. It should be in a file named COPYING. Among other
things, the copyright notice and this notice must be preserved on all
copies. */
/* gsmisc.c */
/* Miscellaneous utilities for Ghostscript library */
#include "gx.h"
#include "malloc_.h"
/* Ghostscript writes to gs_out instead of stdout, */
/* and writes debugging output to gs_debug_out. */
FILE *gs_out;
#ifdef DEBUG
char gs_debug[128];
FILE *gs_debug_out;
#endif
/* Versions of malloc and free compatible with Ghostscript's */
/* model of memory management. We keep track of all allocated */
/* blocks so we can free them at cleanup time. */
typedef struct malloc_block_s malloc_block;
struct malloc_block_s {
malloc_block *next;
uint size;
char *cname;
};
private malloc_block *malloc_list = 0;
char *
gs_malloc(uint num_elts, uint elt_size, char *client_name)
{ char *ptr;
uint size;
if ( num_elts > (max_uint - sizeof(malloc_block)) / elt_size )
{ /* Can't represent the size in a uint! */
lprintf3("%s: malloc(%u,%u) too large for size_t\n",
client_name, num_elts, elt_size);
return 0;
}
size = num_elts * elt_size;
ptr = malloc(size + sizeof(malloc_block));
if ( ptr == 0 )
{
#ifdef DEBUG
if ( gs_debug['e'] | gs_debug['E'] )
lprintf3("%s: malloc(%u,%u) failed\n",
client_name, num_elts, elt_size);
#endif
}
else
{ malloc_block *bp = (malloc_block *)ptr;
bp->next = malloc_list;
bp->size = size;
bp->cname = client_name;
malloc_list = bp;
ptr = (char *)(bp + 1);
#ifdef DEBUG
if ( gs_debug['A'] | gs_debug['a'] )
dprintf3("[a+]%lx:%u (%s)\n",
(ulong)ptr, bp->size, client_name);
/* Clear the block in an attempt to track down */
/* uninitialized data errors. */
{ uint i;
for ( i = 0; i < size; i++ ) ptr[i] = 0xa1;
}
#endif
}
return ptr;
}
void
gs_free(char *ptr, uint num_elts, uint elt_size, char *client_name)
{ malloc_block *bp = malloc_list;
#ifdef DEBUG
if ( gs_debug['A'] | gs_debug['a'] )
dprintf2("[a-]%lx:%u\n", (ulong)ptr, num_elts * elt_size);
#endif
if ( ptr == (char *)(bp + 1) )
{
#ifdef DEBUG
if ( bp->size != num_elts * elt_size )
lprintf5("%s: free 0x%x(%u,%u) size ~= %u\n",
client_name, (ulong)ptr, num_elts, elt_size,
bp->size);
#endif
malloc_list = bp->next;
free(bp);
}
else
{ malloc_block *np;
for ( ; (np = bp->next) != 0; bp = np )
{ if ( ptr == (char *)(np + 1) )
{
#ifdef DEBUG
if ( np->size != num_elts * elt_size )
lprintf5("%s: free 0x%x(%u,%u) size ~= %u\n",
client_name, (ulong)ptr, num_elts, elt_size,
np->size);
#endif
bp->next = np->next;
free(np);
return;
}
}
lprintf4("%s: free 0x%x(%u,%u) not found\n",
client_name, (ulong)ptr, num_elts, elt_size);
free((char *)((malloc_block *)ptr - 1));
}
}
void
gs_malloc_release()
{ malloc_block *bp = malloc_list;
malloc_block *np;
for ( ; bp != 0; bp = np )
{ np = bp->next;
free(bp);
}
malloc_list = 0;
}