linux-kernel - [PATCH v2 1/2] x86: add strlcat() to compressed kernel

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Message-Id: <20220504204123.22967-2-baskov@ispras.ru>
Date:   Wed,  4 May 2022 23:41:22 +0300
From:   Baskov Evgeniy <baskov@...ras.ru>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Baskov Evgeniy <baskov@...ras.ru>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] x86: add strlcat() to compressed kernel

strlcat() simplifies the code of command line
concatenation and reduces the probability of mistakes.

Signed-off-by: Baskov Evgeniy <baskov@...ras.ru>

diff --git a/arch/x86/boot/compressed/string.c b/arch/x86/boot/compressed/string.c
index 81fc1eaa3229..b0635539b6f6 100644
--- a/arch/x86/boot/compressed/string.c
+++ b/arch/x86/boot/compressed/string.c
@@ -40,6 +40,21 @@ static void *____memcpy(void *dest, const void *src, size_t n)
 }
 #endif
 
+size_t strlcat(char *dest, const char *src, size_t count)
+{
+	size_t dsize = strlen(dest);
+	size_t len = strlen(src);
+	size_t res = dsize + len;
+
+	dest += dsize;
+	count -= dsize;
+	if (len >= count)
+		len = count-1;
+	memcpy(dest, src, len);
+	dest[len] = 0;
+	return res;
+}
+
 void *memset(void *s, int c, size_t n)
 {
 	int i;
-- 
2.36.0