[LTP] [PATCH 2/6] fs: rewrite stream01 test using new API

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 testcases/kernel/fs/stream/stream01.c | 153 ++++++++++------------------------
 1 file changed, 46 insertions(+), 107 deletions(-)

diff --git a/testcases/kernel/fs/stream/stream01.c b/testcases/kernel/fs/stream/stream01.c
index af56bca3b916c080328c3356681efbd869b961d2..6d111dc36dcfbab8e0ba8d66d3e901ef36a71400 100644
--- a/testcases/kernel/fs/stream/stream01.c
+++ b/testcases/kernel/fs/stream/stream01.c
@@ -1,127 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
+ * Copyright (c) International Business Machines  Corp., 2002
+ *	ported from SPIE section2/filesuite/stream1.c, by Airong Zhang
  *
- *   Copyright (c) International Business Machines  Corp., 2002
- *
- *   This program is free software;  you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
+ * Copyright (c) 2026 Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * Verify that `freopen()` substitutes the named file in place of stream.
  *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU General Public License for more details.
+ * [Algorithm]
  *
- *   You should have received a copy of the GNU General Public License
- *   along with this program;  if not, write to the Free Software
- *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * - fopen() a stream
+ * - fwrite() something inside it
+ * - perform freopen() creating a new stream pointing to the first one
+ * - fwrite() data inside the new stream
+ * - check that second write to stream went to the file specified by freopen()
  */
 
-/* ported from SPIE section2/filesuite/stream1.c, by Airong Zhang */
+#include "tst_test.h"
+#include "tst_safe_stdio.h"
 
-/*======================================================================
-	=================== TESTPLAN SEGMENT ===================
->KEYS:  < freopen()
->WHAT:  < 1) check that freopen substitutes the named file in place of stream.
->HOW:   < 1) open a stream, write something to it, perform freopen and
-	<    write some more. Check that second write to stream went to
-	<    the file specified by freopen.
->BUGS:  <
-======================================================================*/
+#define FILENAME1 "ltp_file1.txt"
+#define FILENAME2 "ltp_file2.txt"
 
-#include <stdio.h>
-#include <errno.h>
-#include "test.h"
-
-char *TCID = "stream01";
-int TST_TOTAL = 1;
-int local_flag;
+static void read_file(const char *file)
+{
+	char buf[2];
+	FILE *stream;
 
-#define PASSED 1
-#define FAILED 0
+	memset(buf, 0, sizeof(buf));
 
-/* XXX: add setup and cleanup. */
+	stream = SAFE_FOPEN(file, "r");
+	SAFE_FREAD(buf, 1, 1, stream);
+	SAFE_FCLOSE(stream);
 
-char progname[] = "stream01()";
-char tempfile1[40] = "";
-char tempfile2[40] = "";
+	TST_EXP_EXPR((buf[0] == 'a') && (buf[1] == 0),
+		"%s file contains the correct data", file);
+}
 
-/*--------------------------------------------------------------------*/
-int main(int ac, char *av[])
+static void run(void)
 {
 	FILE *stream;
-	char buf[10];
-	int i;
-	int lc;
-
-	/*
-	 * parse standard options
-	 */
-	tst_parse_opts(ac, av, NULL, NULL);
 
-	local_flag = PASSED;
-	tst_tmpdir();
-	for (lc = 0; TEST_LOOPING(lc); lc++) {
+	tst_res(TINFO, "Write %s file", FILENAME1);
+	stream = SAFE_FOPEN(FILENAME1, "a+");
+	SAFE_FWRITE("a", 1, 1, stream);
 
-		sprintf(tempfile1, "stream011.%d", getpid());
-		sprintf(tempfile2, "stream012.%d", getpid());
-	/*--------------------------------------------------------------------*/
-		//block0:
-		if ((stream = fopen(tempfile1, "a+")) == NULL) {
-			tst_brkm(TFAIL, NULL, "fopen(%s) a+ failed: %s",
-				 tempfile1,
-				 strerror(errno));
-		}
-		fwrite("a", 1, 1, stream);
-		if ((stream = freopen(tempfile2, "a+", stream)) == NULL) {
-			tst_brkm(TFAIL | TERRNO, NULL, "freopen(%s) a+ failed",
-				 tempfile2);
-		}
-		fwrite("a", 1, 1, stream);
-		fclose(stream);
+	tst_res(TINFO, "Write %s file streaming into %s file", FILENAME2, FILENAME1);
+	stream = SAFE_FREOPEN(FILENAME2, "a+", stream);
+	SAFE_FWRITE("a", 1, 1, stream);
 
-		/* now check that a single "a" is in each file */
-		if ((stream = fopen(tempfile1, "r")) == NULL) {
-			tst_brkm(TFAIL | TERRNO, NULL, "fopen(%s) r failed",
-				 tempfile1);
-		} else {
-			for (i = 0; i < 10; i++)
-				buf[i] = 0;
-			fread(buf, 1, 1, stream);
-			if ((buf[0] != 'a') || (buf[1] != 0)) {
-				tst_resm(TFAIL, "bad contents in %s",
-					 tempfile1);
-				local_flag = FAILED;
-			}
-			fclose(stream);
-		}
-		if ((stream = fopen(tempfile2, "r")) == NULL) {
-			tst_brkm(TFAIL | TERRNO, NULL, "fopen(%s) r failed",
-				 tempfile2);
-		} else {
-			for (i = 0; i < 10; i++)
-				buf[i] = 0;
-			fread(buf, 1, 1, stream);
-			if ((buf[0] != 'a') || (buf[1] != 0)) {
-				tst_resm(TFAIL, "bad contents in %s",
-					 tempfile2);
-				local_flag = FAILED;
-			}
-			fclose(stream);
-		}
-		if (local_flag == PASSED) {
-			tst_resm(TPASS, "Test passed.");
-		} else {
-			tst_resm(TFAIL, "Test failed.");
-		}
+	SAFE_FCLOSE(stream);
 
-		local_flag = PASSED;
+	read_file(FILENAME1);
+	read_file(FILENAME2);
 
-	/*--------------------------------------------------------------------*/
-		unlink(tempfile1);
-		unlink(tempfile2);
-
-	}			/* end for */
-	tst_rmdir();
-	tst_exit();
+	SAFE_UNLINK(FILENAME1);
+	SAFE_UNLINK(FILENAME2);
 }
+
+static struct tst_test test = {
+	.test_all = run,
+	.needs_tmpdir = 1,
+};

-- 
2.51.0