linuxkpi: Change `strscpy()` and `strscpy_pad()` to make their `len` argument optional

The previous implementation always took the `len` but now, it is
optional and defaults to the size of `dst`.

The DRM drivers started to use `strscpy()` without the `len` in Linux 6.13.

Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D57585

1 files changed, 13 insertions, 2 deletions

diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
index b195dcc8fe9b..8a4da9e19c94 100644
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -31,6 +31,7 @@
 
 #include <sys/ctype.h>
 
+#include <linux/args.h>
 #include <linux/array_size.h>
 #include <linux/types.h>
 #include <linux/gfp.h>
@@ -245,7 +246,7 @@ strreplace(char *str, char old, char new)
 }
 
 static inline ssize_t
-strscpy(char* dst, const char* src, size_t len)
+sized_strscpy(char* dst, const char* src, size_t len)
 {
 	size_t i;
 
@@ -260,8 +261,13 @@ strscpy(char* dst, const char* src, size_t len)
 	return (-E2BIG);
 }
 
+#define	__strscpy0(dst, src, ...)	sized_strscpy(dst, src, sizeof(dst))
+#define	__strscpy1(dst, src, len)	sized_strscpy(dst, src, len)
+#define	strscpy(dst, src, ...)		\
+    CONCATENATE(__strscpy, COUNT_ARGS(__VA_ARGS__))(dst, src, __VA_ARGS__)
+
 static inline ssize_t
-strscpy_pad(char* dst, const char* src, size_t len)
+sized_strscpy_pad(char* dst, const char* src, size_t len)
 {
 
 	bzero(dst, len);
@@ -269,6 +275,11 @@ strscpy_pad(char* dst, const char* src, size_t len)
 	return (strscpy(dst, src, len));
 }
 
+#define	__strscpy_pad0(dst, src, ...)	sized_strscpy_pad(dst, src, sizeof(dst))
+#define	__strscpy_pad1(dst, src, len)	sized_strscpy_pad(dst, src, len)
+#define	strscpy_pad(dst, src, ...)	\
+    CONCATENATE(__strscpy_pad, COUNT_ARGS(__VA_ARGS__))(dst, src, __VA_ARGS__)
+
 static inline char *
 strnchr(const char *cp, size_t n, int ch)
 {