Add a kvasprintf() function to compliment kasprintf().
[ No in-tree users yet, but I have some coming up. ]
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Keir Fraser <[email protected]>
---
include/linux/kernel.h | 1 +
lib/vsprintf.c | 28 ++++++++++++++++++++--------
2 files changed, 21 insertions(+), 8 deletions(-)
===================================================================
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -121,6 +121,7 @@ extern int vscnprintf(char *buf, size_t
__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)));
===================================================================
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -851,22 +851,34 @@ EXPORT_SYMBOL(sscanf);
/* Simplified asprintf. */
-char *kasprintf(gfp_t gfp, const char *fmt, ...)
-{
- va_list ap;
+char *kvasprintf(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);
+ va_list aq;
+
+ va_copy(aq, ap);
+ len = vsnprintf(NULL, 0, fmt, aq);
+ va_end(aq);
p = kmalloc(len+1, gfp);
if (!p)
return NULL;
+
+ vsnprintf(p, len+1, fmt, ap);
+
+ return p;
+}
+
+char *kasprintf(gfp_t gfp, const char *fmt, ...)
+{
+ va_list ap;
+ char *p;
+
va_start(ap, fmt);
- vsnprintf(p, len+1, fmt, ap);
+ p = kvasprintf(gfp, fmt, ap);
va_end(ap);
+
return p;
}
-
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