1/*
 2 *  linux/lib/kasprintf.c
 3 *
 4 *  Copyright (C) 1991, 1992  Linus Torvalds
 5 */
 6
 7#include <stdarg.h>
 8#include <linux/export.h>
 9#include <linux/slab.h>
10#include <linux/types.h>
11#include <linux/string.h>
12
13/* Simplified asprintf. */
14char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
15{
16	unsigned int len;
17	char *p;
18	va_list aq;
19
20	va_copy(aq, ap);
21	len = vsnprintf(NULL, 0, fmt, aq);
22	va_end(aq);
23
24	p = kmalloc_track_caller(len+1, gfp);
25	if (!p)
26		return NULL;
27
28	vsnprintf(p, len+1, fmt, ap);
 
 
29
30	return p;
31}
32EXPORT_SYMBOL(kvasprintf);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
33
34char *kasprintf(gfp_t gfp, const char *fmt, ...)
35{
36	va_list ap;
37	char *p;
38
39	va_start(ap, fmt);
40	p = kvasprintf(gfp, fmt, ap);
41	va_end(ap);
42
43	return p;
44}
45EXPORT_SYMBOL(kasprintf);

 1/*
 2 *  linux/lib/kasprintf.c
 3 *
 4 *  Copyright (C) 1991, 1992  Linus Torvalds
 5 */
 6
 7#include <stdarg.h>
 8#include <linux/export.h>
 9#include <linux/slab.h>
10#include <linux/types.h>
11#include <linux/string.h>
12
13/* Simplified asprintf. */
14char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
15{
16	unsigned int first, second;
17	char *p;
18	va_list aq;
19
20	va_copy(aq, ap);
21	first = vsnprintf(NULL, 0, fmt, aq);
22	va_end(aq);
23
24	p = kmalloc_track_caller(first+1, gfp);
25	if (!p)
26		return NULL;
27
28	second = vsnprintf(p, first+1, fmt, ap);
29	WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)",
30	     first, second, fmt);
31
32	return p;
33}
34EXPORT_SYMBOL(kvasprintf);
35
36/*
37 * If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt
38 * (or the sole vararg) points to rodata, we will then save a memory
39 * allocation and string copy. In any case, the return value should be
40 * freed using kfree_const().
41 */
42const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap)
43{
44	if (!strchr(fmt, '%'))
45		return kstrdup_const(fmt, gfp);
46	if (!strcmp(fmt, "%s"))
47		return kstrdup_const(va_arg(ap, const char*), gfp);
48	return kvasprintf(gfp, fmt, ap);
49}
50EXPORT_SYMBOL(kvasprintf_const);
51
52char *kasprintf(gfp_t gfp, const char *fmt, ...)
53{
54	va_list ap;
55	char *p;
56
57	va_start(ap, fmt);
58	p = kvasprintf(gfp, fmt, ap);
59	va_end(ap);
60
61	return p;
62}
63EXPORT_SYMBOL(kasprintf);