These macros take the end of the array argument implicitly to avoid
programmer mistakes. This guarantees that the input is an array, unlike
snprintf(buf, sizeof(buf), ...);
which is dangerous if the programmer passes a pointer instead of an
array.
These macros are essentially the same as the 2-argument version of
strscpy(), but with a formatted string, and returning a pointer to the
terminating '\0' (or NULL, on error).
Cc: Rasmus Villemoes <li...@rasmusvillemoes.dk>
Cc: Marco Elver <el...@google.com>
Cc: Michal Hocko <mho...@suse.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Alejandro Colomar <a...@kernel.org>
---
include/linux/sprintf.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/sprintf.h b/include/linux/sprintf.h
index a0dc35574521..8576a543e62c 100644
--- a/include/linux/sprintf.h
+++ b/include/linux/sprintf.h
@@ -4,6 +4,10 @@
#include <linux/compiler_attributes.h>
#include <linux/types.h>
+#include <linux/array_size.h>
+
+#define sprintf_array(a, fmt, ...) sprintf_end(a, ENDOF(a), fmt,
##__VA_ARGS__)
+#define vsprintf_array(a, fmt, ap) vsprintf_end(a, ENDOF(a), fmt, ap)
int num_to_str(char *buf, int size, unsigned long long num, unsigned int
width);
--
2.50.0
