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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
*
* (C) COPYRIGHT 2014, 2017, 2020-2022 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU license.
*
* 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, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
*/
/* Kernel UTF utility functions */
#include <linux/mutex.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <kutf/kutf_utils.h>
#include <kutf/kutf_mem.h>
static char tmp_buffer[KUTF_MAX_DSPRINTF_LEN];
static DEFINE_MUTEX(buffer_lock);
const char *kutf_dsprintf(struct kutf_mempool *pool,
const char *fmt, ...)
{
va_list args;
int len;
int size;
void *buffer;
mutex_lock(&buffer_lock);
va_start(args, fmt);
len = vsnprintf(tmp_buffer, sizeof(tmp_buffer), fmt, args);
va_end(args);
if (len < 0) {
pr_err("%s: Bad format dsprintf format %s\n", __func__, fmt);
goto fail_format;
}
if (len >= sizeof(tmp_buffer)) {
pr_warn("%s: Truncated dsprintf message %s\n", __func__, fmt);
size = sizeof(tmp_buffer);
} else {
size = len + 1;
}
buffer = kutf_mempool_alloc(pool, size);
if (!buffer)
goto fail_alloc;
memcpy(buffer, tmp_buffer, size);
mutex_unlock(&buffer_lock);
return buffer;
fail_alloc:
fail_format:
mutex_unlock(&buffer_lock);
return NULL;
}
EXPORT_SYMBOL(kutf_dsprintf);
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