| /* |
| * |
| * (C) COPYRIGHT 2014, 2017 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 licence. |
| * |
| * 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. |
| * |
| * SPDX-License-Identifier: GPL-2.0 |
| * |
| */ |
| |
| /* 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]; |
| |
| 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("kutf_dsprintf: Bad format dsprintf format %s\n", fmt); |
| goto fail_format; |
| } |
| |
| if (len >= sizeof(tmp_buffer)) { |
| pr_warn("kutf_dsprintf: Truncated dsprintf message %s\n", 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); |