linux-kernel - [PATCH] scripts/kconfig: replace single character strcat() appends

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Message-ID: <20180302074424.2myh3zhxnbpaohjq@gmail.com>
Date:   Thu, 1 Mar 2018 21:44:24 -1000
From:   Joey Pabalinas <joeypabalinas@...il.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Arnaud Lacombe <lacombar@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Joey Pabalinas <joeypabalinas@...il.com>
Subject: [PATCH] scripts/kconfig: replace single character strcat() appends

Convert strcat() calls which only append single characters
to the end of res into simpler (and most likely cheaper)
single assignment statements.

Signed-off-by: Joey Pabalinas <joeypabalinas@...il.com>

 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index cca9663be5ddd91870..67600f48660f2ac142 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -910,8 +910,7 @@ char *sym_expand_string_value(const char *in)
 	 * freed, so make sure to always allocate a new string
 	 */
 	reslen = strlen(in) + 1;
-	res = xmalloc(reslen);
-	res[0] = '\0';
+	res = xcalloc(1, reslen);
 
 	while ((src = strchr(in, '$'))) {
 		char *p, name[SYMBOL_MAXLENGTH];
@@ -951,7 +950,7 @@ const char *sym_escape_string_value(const char *in)
 {
 	const char *p;
 	size_t reslen;
-	char *res;
+	char *res, *end;
 	size_t l;
 
 	reslen = strlen(in) + strlen("\"\"") + 1;
@@ -968,25 +967,25 @@ const char *sym_escape_string_value(const char *in)
 		p++;
 	}
 
-	res = xmalloc(reslen);
-	res[0] = '\0';
-
-	strcat(res, "\"");
+	res = xcalloc(1, reslen);
+	end = res;
+	*end++ = '\"';
 
 	p = in;
 	for (;;) {
 		l = strcspn(p, "\"\\");
 		strncat(res, p, l);
 		p += l;
+		end += l;
 
 		if (p[0] == '\0')
 			break;
 
-		strcat(res, "\\");
-		strncat(res, p++, 1);
+		*end++ = '\\';
+		*end++ = *p++;
 	}
+	*end = '\"';
 
-	strcat(res, "\"");
 	return res;
 }
 
-- 
2.16.2

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