Add kvasprintf()

Add a kvasprintf() function to complement kasprintf(). No in-tree users yet, but I have some coming up. [[email protected]: EXPORT it] Signed-off-by: Jeremy Fitzhardinge <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Keir Fraser <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
rtvt123 · Apr 30, 2007 · 11443ec · 11443ec
1 parent 9684e51
commit 11443ec
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Showing 2 changed files with 20 additions and 7 deletions.
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
@@ -121,6 +121,7 @@ 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 char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
 
 extern int sscanf(const char *, const char *, ...)
 	__attribute__ ((format (scanf, 2, 3)));

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
@@ -851,23 +851,35 @@ EXPORT_SYMBOL(sscanf);
 
 
 /* Simplified asprintf. */
-char *kasprintf(gfp_t gfp, const char *fmt, ...)
+char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
 {
-	va_list ap;
 	unsigned int len;
 	char *p;
+	va_list aq;
 
-	va_start(ap, fmt);
-	len = vsnprintf(NULL, 0, fmt, ap);
-	va_end(ap);
+	va_copy(aq, ap);
+	len = vsnprintf(NULL, 0, fmt, aq);
+	va_end(aq);
 
 	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(kvasprintf);
+
+char *kasprintf(gfp_t gfp, const char *fmt, ...)
+{
+	va_list ap;
+	char *p;
 
+	va_start(ap, fmt);
+	p = kvasprintf(gfp, fmt, ap);
+	va_end(ap);
+
+	return p;
+}
 EXPORT_SYMBOL(kasprintf);