]>
Commit | Line | Data |
---|---|---|
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. */ | |
14 | char *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 | } | |
34 | EXPORT_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 | */ | |
42 | const 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 | } | |
50 | EXPORT_SYMBOL(kvasprintf_const); | |
51 | ||
52 | char *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 | } | |
63 | EXPORT_SYMBOL(kasprintf); |