linux-kernel - [RFC 5/6] kernel.h: implement fmtmatch() wrapper around fmtcheck()

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Date:   Wed,  8 Nov 2017 23:30:19 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     kernel-hardening@...ts.openwall.com
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [RFC 5/6] kernel.h: implement fmtmatch() wrapper around fmtcheck()

I couldn't come up with a better name, suggestions welcome.

Some users may prefer to EINVAL rather than using the the template as a
fallback for printf'ing. fmtmatch() is simply a shorthand for
fmtcheck(a, b, c) == a.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 include/linux/kernel.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d7c6f9a9c024..5eae5ecb590d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -466,6 +466,13 @@ const char *_fmtcheck(const char *fmt, const char *tmpl, unsigned flags);
 #define FMTCHECK_SILENT        0x01
 #define FMTCHECK_NO_EXTRA_ARGS 0x02
 
+#define fmtmatch(fmt, tmpl, flags) _fmtmatch(fmt, "" tmpl "", flags)
+static inline bool
+_fmtmatch(const char *fmt, const char *tmpl, unsigned flags)
+{
+	return _fmtcheck(fmt, tmpl, flags) == fmt;
+}
+
 extern __scanf(2, 3)
 int sscanf(const char *, const char *, ...);
 extern __scanf(2, 0)
-- 
2.11.0