Commit | Line | Data |
---|---|---|
96e3e18e SR |
1 | /* |
2 | * linux/lib/kasprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include <stdarg.h> | |
8bc3bcc9 | 8 | #include <linux/export.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
96e3e18e SR |
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 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 | ||
3e1aa66b | 24 | p = kmalloc_track_caller(len+1, gfp); |
96e3e18e SR |
25 | if (!p) |
26 | return NULL; | |
27 | ||
28 | vsnprintf(p, len+1, fmt, ap); | |
29 | ||
30 | return p; | |
31 | } | |
32 | EXPORT_SYMBOL(kvasprintf); | |
33 | ||
0a9df786 RV |
34 | /* |
35 | * If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt | |
36 | * (or the sole vararg) points to rodata, we will then save a memory | |
37 | * allocation and string copy. In any case, the return value should be | |
38 | * freed using kfree_const(). | |
39 | */ | |
40 | const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap) | |
41 | { | |
42 | if (!strchr(fmt, '%')) | |
43 | return kstrdup_const(fmt, gfp); | |
44 | if (!strcmp(fmt, "%s")) | |
45 | return kstrdup_const(va_arg(ap, const char*), gfp); | |
46 | return kvasprintf(gfp, fmt, ap); | |
47 | } | |
48 | EXPORT_SYMBOL(kvasprintf_const); | |
49 | ||
96e3e18e SR |
50 | char *kasprintf(gfp_t gfp, const char *fmt, ...) |
51 | { | |
52 | va_list ap; | |
53 | char *p; | |
54 | ||
55 | va_start(ap, fmt); | |
56 | p = kvasprintf(gfp, fmt, ap); | |
57 | va_end(ap); | |
58 | ||
59 | return p; | |
60 | } | |
61 | EXPORT_SYMBOL(kasprintf); |