linux-kernel - [PATCH v4 1/7] lib/hexdump.c: Fix selftests

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Message-Id: <20190625031726.12173-2-alastair@au1.ibm.com>
Date:   Tue, 25 Jun 2019 13:17:20 +1000
From:   "Alastair D'Silva" <alastair@....ibm.com>
To:     alastair@...ilva.org
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Karsten Keil <isdn@...ux-pingi.de>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        David Laight <David.Laight@...LAB.COM>,
        Andrew Morton <akpm@...ux-foundation.org>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-fbdev@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH v4 1/7] lib/hexdump.c: Fix selftests

From: Alastair D'Silva <alastair@...ilva.org>

The overflow tests did not account for the situation where no
overflow occurs and len < rowsize.

This patch renames the cryptic variables and accounts for the
above case.

The selftests now pass.

Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
---
 lib/test_hexdump.c | 48 +++++++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/lib/test_hexdump.c b/lib/test_hexdump.c
index 5144899d3c6b..bef97a964582 100644
--- a/lib/test_hexdump.c
+++ b/lib/test_hexdump.c
@@ -163,45 +163,53 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 {
 	char test[TEST_HEXDUMP_BUF_SIZE];
 	char buf[TEST_HEXDUMP_BUF_SIZE];
-	int rs = rowsize, gs = groupsize;
-	int ae, he, e, f, r;
-	bool a;
+	int ascii_len, hex_len, expected_len, fill_point, ngroups, rc;
+	bool match;
 
 	total_tests++;
 
 	memset(buf, FILL_CHAR, sizeof(buf));
 
-	r = hex_dump_to_buffer(data_b, len, rs, gs, buf, buflen, ascii);
+	rc = hex_dump_to_buffer(data_b, len, rowsize, groupsize, buf, buflen,
+				ascii);
 
 	/*
 	 * Caller must provide the data length multiple of groupsize. The
 	 * calculations below are made with that assumption in mind.
 	 */
-	ae = rs * 2 /* hex */ + rs / gs /* spaces */ + 1 /* space */ + len /* ascii */;
-	he = (gs * 2 /* hex */ + 1 /* space */) * len / gs - 1 /* no trailing space */;
+	ngroups = rowsize / groupsize;
+	hex_len = (groupsize * 2 /* hex */ + 1 /* spaces */) * ngroups
+		  - 1 /* no trailing space */;
+	ascii_len = hex_len + 2 /* space */ + len /* ascii */;
+
+	if (len < rowsize) {
+		ngroups = len / groupsize;
+		hex_len = (groupsize * 2 /* hex */ + 1 /* spaces */) * ngroups
+		  - 1 /* no trailing space */;
+	}
 
-	if (ascii)
-		e = ae;
-	else
-		e = he;
+	expected_len = (ascii) ? ascii_len : hex_len;
 
-	f = min_t(int, e + 1, buflen);
+	fill_point = min_t(int, expected_len + 1, buflen);
 	if (buflen) {
-		test_hexdump_prepare_test(len, rs, gs, test, sizeof(test), ascii);
-		test[f - 1] = '\0';
+		test_hexdump_prepare_test(len, rowsize, groupsize, test,
+					  sizeof(test), ascii);
+		test[fill_point - 1] = '\0';
 	}
-	memset(test + f, FILL_CHAR, sizeof(test) - f);
+	memset(test + fill_point, FILL_CHAR, sizeof(test) - fill_point);
 
-	a = r == e && !memcmp(test, buf, TEST_HEXDUMP_BUF_SIZE);
+	match = rc == expected_len && !memcmp(test, buf, TEST_HEXDUMP_BUF_SIZE);
 
 	buf[sizeof(buf) - 1] = '\0';
 
-	if (!a) {
-		pr_err("Len: %zu buflen: %zu strlen: %zu\n",
-			len, buflen, strnlen(buf, sizeof(buf)));
-		pr_err("Result: %d '%s'\n", r, buf);
-		pr_err("Expect: %d '%s'\n", e, test);
+	if (!match) {
+		pr_err("rowsize: %u groupsize: %u ascii: %d Len: %zu buflen: %zu strlen: %zu\n",
+			rowsize, groupsize, ascii, len, buflen,
+			strnlen(buf, sizeof(buf)));
+		pr_err("Result: %d '%-.*s'\n", rc, (int)buflen, buf);
+		pr_err("Expect: %d '%-.*s'\n", expected_len, (int)buflen, test);
 		failed_tests++;
+
 	}
 }
 
-- 
2.21.0