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/*
* $Id$
*
* Copyright (C) 2005-2006 iptelorg GmbH
*
* This file is part of ser, a free SIP server.
*
* ser 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
*
* For a license to use the ser software under conditions
* other than those described here, or to purchase support for this
* software, please contact iptel.org by e-mail at the following addresses:
* info@iptel.org
*
* ser 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 the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* History:
* --------
* 2006-06-16 static buffer for select results (mma)
* each process owns a separate space
* each request starts using the buffer from the start
*
*/
/*!
* \file
* \brief SIP-router core ::
* \ingroup core
* Module: \ref core
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include "dprint.h"
#include "mem/mem.h"
#include "str.h"
#include "ut.h"
/*
* Placeholder for the buffer
*
* two buffers are actually used to cover the different size requests
* assuming that resize can move the result to newly allocated space
* and comparing two selects from the script could require two static buffers
*
* if more static buffers need to be valid at the same time change
* the following constant
*/
#define MAX_BUFFERS 2
#define BUFFER_GRANULARITY 256
typedef struct stat_buffer_ {
char *b;
int size;
int offset;
} stat_buffer_t;
static stat_buffer_t buffer[MAX_BUFFERS];
static int active_buffer=-1;
#define ALLOC_SIZE(req_size) (((req_size/BUFFER_GRANULARITY)+1)*BUFFER_GRANULARITY)
static int allocate_buffer(int req_size) {
void *b;
int size=ALLOC_SIZE(req_size);
if (buffer[active_buffer].b == NULL) {
if ((buffer[active_buffer].b=pkg_malloc(size))==NULL)
return 0;
buffer[active_buffer].size=size;
buffer[active_buffer].offset=0;
return 1;
}
active_buffer = (active_buffer?active_buffer:MAX_BUFFERS)-1;
if (buffer[active_buffer].size >= req_size) {
buffer[active_buffer].offset = 0;
return 1;
}
if ((b=pkg_realloc(buffer[active_buffer].b,size))) {
buffer[active_buffer].b=b;
buffer[active_buffer].size=size;
buffer[active_buffer].offset=0;
return 1;
}
return 0;
}
/*
* Request for space from buffer
*
* Returns: NULL memory allocation failure (no more space)
* pointer to the space on success
*/
char* get_static_buffer(int req_size) {
char *p = NULL;
#ifdef EXTRA_DEBUG
if ((active_buffer < 0) || (active_buffer > MAX_BUFFERS-1)) {
LM_CRIT("buffers have not been initialized yet. "
"Call reset_static_buffer() before executing "
"a route block.\n");
abort();
}
#endif
if ((buffer[active_buffer].size >= buffer[active_buffer].offset + req_size)
|| (allocate_buffer(req_size))) {
/* enough space in current buffer or allocation successful */
p = buffer[active_buffer].b+buffer[active_buffer].offset;
buffer[active_buffer].offset += req_size;
return p;
}
return NULL;
}
/* Internal function - called before request is going to be processed
*
* Reset offset to unused space
*/
int reset_static_buffer(void) {
int i;
if (active_buffer == -1) {
memset(buffer, 0, sizeof(buffer));
} else {
for (i=0; i<MAX_BUFFERS; i++)
buffer[i].offset=0;
}
active_buffer=0;
return 0;
}
int str_to_static_buffer(str* res, str* s)
{
res->s = get_static_buffer(s->len);
if (!res->s) return -1;
memcpy(res->s, s->s, s->len);
res->len = s->len;
return 0;
}
int int_to_static_buffer(str* res, int val)
{
char *c;
c = int2str(abs(val), &res->len);
res->s = get_static_buffer(res->len+((val<0)?1:0));
if (!res->s) return -1;
if (val < 0) {
res->s[0] = '-';
memcpy(res->s+1, c, res->len);
res->len++;
}
else {
memcpy(res->s, c, res->len);
}
return 0;
}
int uint_to_static_buffer(str* res, unsigned int val)
{
char *c;
c = int2str(val, &res->len);
res->s = get_static_buffer(res->len);
if (!res->s) return -1;
memcpy(res->s, c, res->len);
return 0;
}
int uint_to_static_buffer_ex(str* res, unsigned int val, int base, int pad)
{
char *c;
c = int2str_base_0pad(val, &res->len, base, pad);
res->s = get_static_buffer(res->len);
if (!res->s) return -1;
memcpy(res->s, c, res->len);
return 0;
}
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