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/*
* Copyright (C) 2002 Cisco Systems, Inc.
* maintained by linux-iscsi-devel@lists.sourceforge.net
*
* 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.
*
* See the file COPYING included with this distribution for more details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/param.h>
#include "local_strings.h"
#include "log.h"
int str_init_buffer(struct str_buffer *s, size_t initial_allocation)
{
if (s) {
memset(s, 0, sizeof (*s));
s->buffer = NULL;
if (initial_allocation) {
s->buffer = malloc(initial_allocation);
if (s->buffer) {
s->allocated_length = initial_allocation;
memset(s->buffer, 0, initial_allocation);
}
}
s->data_length = 0;
return 1;
}
return 0;
}
struct str_buffer *str_alloc_buffer(size_t initial_allocation)
{
struct str_buffer *s = calloc(1, sizeof (*s));
if (s)
str_init_buffer(s, initial_allocation);
return s;
}
void str_free_buffer(struct str_buffer *s)
{
if (s) {
if (s->buffer) {
free(s->buffer);
s->buffer = NULL;
}
s->allocated_length = 0;
s->data_length = 0;
}
}
int str_enlarge_data(struct str_buffer *s, int length)
{
void *new_buf;
if (s) {
s->data_length += length;
if (s->data_length > s->allocated_length) {
log_debug(7, "enlarge buffer from %zu to %zu",
s->allocated_length, s->data_length);
new_buf = realloc(s->buffer, s->data_length);
if (!new_buf) {
/* too big */
log_error("enlarged buffer %p to %d data "
"bytes, with only %d bytes of buffer "
"space", s, (int)s->data_length,
(int)s->allocated_length);
return ENOMEM;
}
s->buffer = new_buf;
memset(s->buffer + s->allocated_length, 0,
s->data_length - s->allocated_length);
s->allocated_length = s->data_length;
}
}
return 0;
}
void str_remove_initial(struct str_buffer *s, int length)
{
char *remaining;
int amount;
if (s && length) {
remaining = s->buffer + length;
amount = s->data_length - length;
if (amount < 0)
amount = 0;
if (amount)
memmove(s->buffer, remaining, amount);
s->data_length = amount;
s->buffer[amount] = '\0';
}
}
/* truncate the data length down */
void str_truncate_buffer(struct str_buffer *s, size_t length)
{
if (s) {
if (!s->data_length)
return;
if (length <= s->data_length) {
s->data_length = length;
s->buffer[s->data_length] = '\0';
} else if (length <= s->allocated_length) {
/* clear the data, and declare the
* data length to be larger
*/
memset(s->buffer + s->data_length, 0,
length - s->data_length);
s->data_length = length;
} else {
log_error(
"couldn't truncate data buffer to length %d, "
"only allocated %d",
(int)length, (int)s->allocated_length);
}
}
}
char *str_buffer_data(struct str_buffer *s)
{
if (s)
return s->buffer;
else
return NULL;
}
size_t str_data_length(struct str_buffer * s)
{
if (s)
return s->data_length;
else
return 0;
}
size_t str_unused_length(struct str_buffer * s)
{
if (s)
return s->allocated_length - s->data_length;
else
return 0;
}
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