linux-kernel - [PATCH v2 3/9] test_hexdump: define FILL

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Date:	Wed,  9 Dec 2015 02:49:59 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 3/9] test_hexdump: define FILL_CHAR constant

Define a character to fill the test buffers. Though the character should be
printable since it's used when errors are reported. It should neither be from
hex digit [a-fA-F0-9] dictionary nor space. It is recommended not to use one
which is present in ASCII part of the test data. Later on we might switch to
unprintable character to make test case more robust.

Suggested-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 lib/test_hexdump.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/lib/test_hexdump.c b/lib/test_hexdump.c
index ed7c6a7..1ecdb97 100644
--- a/lib/test_hexdump.c
+++ b/lib/test_hexdump.c
@@ -42,6 +42,8 @@ static const char * const test_data_8_le[] __initconst = {
 	"e9ac0f9cad319ca6", "0cafb1439919d14c",
 };
 
+#define FILL_CHAR	'#'
+
 static void __init test_hexdump_prepare_test(size_t len, int rowsize,
 					     int groupsize, char *test,
 					     size_t testlen, bool ascii)
@@ -70,7 +72,7 @@ static void __init test_hexdump_prepare_test(size_t len, int rowsize,
 	else
 		result = test_data_1_le;
 
-	memset(test, ' ', testlen);
+	memset(test, FILL_CHAR, testlen);
 
 	/* hex dump */
 	p = test;
@@ -79,14 +81,19 @@ static void __init test_hexdump_prepare_test(size_t len, int rowsize,
 		size_t amount = strlen(q);
 
 		strncpy(p, q, amount);
-		p += amount + 1;
+		p += amount;
+
+		*p++ = ' ';
 	}
 	if (i)
 		p--;
 
 	/* ASCII part */
 	if (ascii) {
-		p = test + rs * 2 + rs / gs + 1;
+		do {
+			*p++ = ' ';
+		} while (p < test + rs * 2 + rs / gs + 1);
+
 		strncpy(p, data_a, l);
 		p += l;
 	}
@@ -134,7 +141,7 @@ static void __init test_hexdump_overflow(bool ascii)
 	bool a;
 	int e, r;
 
-	memset(buf, ' ', sizeof(buf));
+	memset(buf, FILL_CHAR, sizeof(buf));
 
 	r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii);
 
@@ -145,14 +152,14 @@ static void __init test_hexdump_overflow(bool ascii)
 	buf[e + 2] = '\0';
 
 	if (!l) {
-		a = r == e && buf[0] == ' ';
+		a = r == e && buf[0] == FILL_CHAR;
 	} else if (l < 3) {
 		a = r == e && buf[0] == '\0';
 	} else if (l < 4) {
 		a = r == e && !strcmp(buf, t);
 	} else if (ascii) {
 		if (l < 51)
-			a = r == e && buf[l - 1] == '\0' && buf[l - 2] == ' ';
+			a = r == e && buf[l - 1] == '\0' && buf[l - 2] == FILL_CHAR;
 		else
 			a = r == e && buf[50] == '\0' && buf[49] == '.';
 	} else {
-- 
2.6.2

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