1 /*
2 *
3 * (C) COPYRIGHT 2014, 2017 ARM Limited. All rights reserved.
4 *
5 * This program is free software and is provided to you under the terms of the
6 * GNU General Public License version 2 as published by the Free Software
7 * Foundation, and any use by you of this program is subject to the terms
8 * of such GNU licence.
9 *
10 * A copy of the licence is included with the program, and can also be obtained
11 * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
12 * Boston, MA 02110-1301, USA.
13 *
14 */
15
16
17
18 /* Kernel UTF utility functions */
19
20 #include <linux/mutex.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/printk.h>
24
25 #include <kutf/kutf_utils.h>
26 #include <kutf/kutf_mem.h>
27
28 static char tmp_buffer[KUTF_MAX_DSPRINTF_LEN];
29
30 DEFINE_MUTEX(buffer_lock);
31
kutf_dsprintf(struct kutf_mempool * pool,const char * fmt,...)32 const char *kutf_dsprintf(struct kutf_mempool *pool,
33 const char *fmt, ...)
34 {
35 va_list args;
36 int len;
37 int size;
38 void *buffer;
39
40 mutex_lock(&buffer_lock);
41 va_start(args, fmt);
42 len = vsnprintf(tmp_buffer, sizeof(tmp_buffer), fmt, args);
43 va_end(args);
44
45 if (len < 0) {
46 pr_err("kutf_dsprintf: Bad format dsprintf format %s\n", fmt);
47 goto fail_format;
48 }
49
50 if (len >= sizeof(tmp_buffer)) {
51 pr_warn("kutf_dsprintf: Truncated dsprintf message %s\n", fmt);
52 size = sizeof(tmp_buffer);
53 } else {
54 size = len + 1;
55 }
56
57 buffer = kutf_mempool_alloc(pool, size);
58 if (!buffer)
59 goto fail_alloc;
60
61 memcpy(buffer, tmp_buffer, size);
62 mutex_unlock(&buffer_lock);
63
64 return buffer;
65
66 fail_alloc:
67 fail_format:
68 mutex_unlock(&buffer_lock);
69 return NULL;
70 }
71 EXPORT_SYMBOL(kutf_dsprintf);
72