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/*
CrossFire, A Multiplayer game for X-windows
Copyright (C) 2008 Crossfire Development Team
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 the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
The authors can be reached via e-mail at crossfire-devel@real-time.com
*/
#include <stdlib.h>
#include <string.h>
#include "global.h"
#include "libproto.h"
#include "stringbuffer.h"
struct StringBuffer
{
/**
* The string buffer. The first {@link #pos} bytes contain the collected
* string. It's size is at least {@link #size} bytes.
*/
char *buf;
/**
* The current length of {@link #buf}. The invariant <code>pos <
* size</code> always holds; this means there is always enough room to
* attach a trailing \0 character.
*/
size_t pos;
/**
* The allocation size of {@link #buf}.
*/
size_t size;
};
/**
* Make sure that at least <code>len</code> bytes are available in the passed
* string buffer.
*
* @param sb The string buffer to modify.
*
* @param len The number of bytes to allocate.
*/
static void stringbuffer_ensure(StringBuffer *sb, size_t len);
StringBuffer *stringbuffer_new(void) {
StringBuffer *sb;
sb = malloc(sizeof(*sb));
if (sb == NULL) {
fatal(OUT_OF_MEMORY);
}
sb->size = 256;
sb->buf = malloc(sb->size);
sb->pos = 0;
return sb;
}
char *stringbuffer_finish(StringBuffer *sb) {
char *result;
sb->buf[sb->pos] = '\0';
result = sb->buf;
free(sb);
return result;
}
void stringbuffer_append_string(StringBuffer *sb, const char *str) {
size_t len;
len = strlen(str);
stringbuffer_ensure(sb, len+1);
memcpy(sb->buf+sb->pos, str, len);
sb->pos += len;
}
static void stringbuffer_ensure(StringBuffer *sb, size_t len) {
char *tmp;
size_t new_size;
if (sb->pos+len <= sb->size) {
return;
}
new_size = sb->pos+len+256;
tmp = realloc(sb->buf, new_size);
if (tmp == NULL) {
fatal(OUT_OF_MEMORY);
}
sb->buf = tmp;
sb->size = new_size;
}
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