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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
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);
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40
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);
64