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abuf.c
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abuf.c
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/*
Axel -- A lighter download accelerator for Linux and other Unices
Copyright 2020 Ismael Luceno
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.
In addition, as a special exception, the copyright holders give
permission to link the code of portions of this program with the
OpenSSL library under certain conditions as described in each
individual source file, and distribute linked combinations including
the two.
You must obey the GNU General Public License in all respects for all
of the code used other than OpenSSL. If you modify file(s) with this
exception, you may extend this exception to your version of the
file(s), but you are not obligated to do so. If you do not wish to do
so, delete this exception statement from your version. If you delete
this exception statement from all source files in the program, then
also delete it here.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define _ISOC99_SOURCE
#include "config.h"
#include <errno.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include "axel.h"
/**
* Abstract buffer allocation/free.
* @returns 0 if OK, a negative value on error.
*/
int
abuf_setup(abuf_t *abuf, size_t len)
{
char *p = realloc(abuf->p, len);
if (!p && len)
return -ENOMEM;
abuf->p = p;
abuf->len = len;
return 0;
}
int
abuf_printf(abuf_t *abuf, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
for (;;) {
size_t len = vsnprintf(abuf->p, abuf->len, fmt, ap);
if (len < abuf->len)
break;
int r = abuf_setup(abuf, len + 1);
if (r < 0)
return r;
}
va_end(ap);
return 0;
}
/**
* String concatenation. The buffer must contain a valid C string.
* @returns 0 if OK, or negative value on error.
*/
int
abuf_strcat(abuf_t *abuf, const char *src)
{
size_t nread = strlcat(abuf->p, src, abuf->len);
if (nread > abuf->len) {
size_t done = abuf->len - 1;
int ret = abuf_setup(abuf, nread);
if (ret < 0)
return ret;
memcpy(abuf->p + done, src + done, nread - done);
}
return 0;
}