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[PATCH] Implement kasprintf

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Implement kasprintf, a kernel version of asprintf.  This allocates the
memory required for the formatted string, including the trailing '\0'.
Returns NULL on allocation failure.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeremy Fitzhardinge 2006-06-25 05:49:17 -07:00 committed by Linus Torvalds
parent f796937a06
commit e905914f96
2 changed files with 25 additions and 0 deletions
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2
include/linux/kernel.h
View file

@ -117,6 +117,8 @@ extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
__attribute__ ((format (printf, 3, 4)));
extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
__attribute__ ((format (printf, 3, 0)));
extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
__attribute__ ((format (printf, 2, 3)));
extern int sscanf(const char *, const char *, ...)
__attribute__ ((format (scanf, 2, 3)));

23
lib/vsprintf.c
View file

@ -849,3 +849,26 @@ int sscanf(const char * buf, const char * fmt, ...)
}
EXPORT_SYMBOL(sscanf);
/* Simplified asprintf. */
char *kasprintf(gfp_t gfp, const char *fmt, ...)
{
va_list ap;
unsigned int len;
char *p;
va_start(ap, fmt);
len = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
p = kmalloc(len+1, gfp);
if (!p)
return NULL;
va_start(ap, fmt);
vsnprintf(p, len+1, fmt, ap);
va_end(ap);
return p;
}
EXPORT_SYMBOL(kasprintf);