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Commit e905914f authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Linus Torvalds
Browse files

[PATCH] Implement kasprintf 



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: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: default avatarChris Wright <chrisw@sous-sol.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f796937a

include/linux/kernel.h

+2 −0
Original line number Diff line number Diff line
@@ -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)));

lib/vsprintf.c

+23 −0
Original line number Diff line number Diff line
@@ -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);