quakeforge/libs/util/sizebuf.c

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/*
sizebuf.c
(description)
Copyright (C) 1996-1997 Id Software, Inc.
This program 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
of the License, or (at your option) any later version.
This program 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 this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
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static const char rcsid[] =
"$Id$";
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "QF/sizebuf.h"
#include "QF/sys.h"
#include "QF/zone.h"
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void
SZ_Alloc (sizebuf_t *buf, int startsize)
{
if (startsize < 256)
startsize = 256;
buf->data = Hunk_AllocName (startsize, "sizebuf");
buf->maxsize = startsize;
buf->cursize = 0;
}
void
SZ_Clear (sizebuf_t *buf)
{
buf->cursize = 0;
buf->overflowed = false;
}
void *
SZ_GetSpace (sizebuf_t *buf, int length)
{
void *data;
if (buf->cursize + length > buf->maxsize) {
if (!buf->allowoverflow)
Sys_Error ("SZ_GetSpace: overflow without allowoverflow set (%d)",
buf->maxsize);
if (length > buf->maxsize)
Sys_Error ("SZ_GetSpace: %i is > full buffer size", length);
Sys_Printf ("SZ_GetSpace: overflow\n");
SZ_Clear (buf);
buf->overflowed = true;
}
data = buf->data + buf->cursize;
buf->cursize += length;
return data;
}
void
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SZ_Write (sizebuf_t *buf, const void *data, int length)
{
memcpy (SZ_GetSpace (buf, length), data, length);
}
void
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SZ_Print (sizebuf_t *buf, const char *data)
{
int len;
len = strlen (data) + 1;
if (!buf->cursize || buf->data[buf->cursize - 1])
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// no trailing 0
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memcpy (SZ_GetSpace (buf, len), data, len);
else
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// write over trailing 0
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memcpy (SZ_GetSpace (buf, len - 1) - 1, data, len);
}