linux-kernel - [PATCH 28/32] selftests/nolibc: use snprintf() for printf tests

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Message-Id: <20250304-nolibc-kselftest-harness-v1-28-adca7cd231e2@linutronix.de>
Date: Tue, 04 Mar 2025 08:10:58 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Shuah Khan <shuah@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>, 
 Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 28/32] selftests/nolibc: use snprintf() for printf tests

With a proper snprintf() implementation in place, the ugly pipe usage is
not necessary anymore.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 30 +++-------------------------
 1 file changed, 3 insertions(+), 27 deletions(-)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 6fa659429cfc38c9d42f36f80ab6c529890d9ad7..1b60eb848c02ef4e90782a83e90987b7efb71031 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -1283,27 +1283,14 @@ int run_stdlib(int min, int max)
 
 static int expect_vfprintf(int llen, int c, const char *expected, const char *fmt, ...)
 {
-	int ret, pipefd[2];
-	ssize_t w, r;
 	char buf[100];
-	FILE *memfile;
 	va_list args;
+	ssize_t w;
+	int ret;
 
-	ret = pipe(pipefd);
-	if (ret == -1) {
-		llen += printf(" pipe() != %s", strerror(errno));
-		result(llen, FAIL);
-		return 1;
-	}
-
-	memfile = fdopen(pipefd[1], "w");
-	if (!memfile) {
-		result(llen, FAIL);
-		return 1;
-	}
 
 	va_start(args, fmt);
-	w = vfprintf(memfile, fmt, args);
+	w = vsnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);
 
 	if (w != c) {
@@ -1312,17 +1299,6 @@ static int expect_vfprintf(int llen, int c, const char *expected, const char *fm
 		return 1;
 	}
 
-	fclose(memfile);
-
-	r = read(pipefd[0], buf, sizeof(buf) - 1);
-
-	if (r != w) {
-		llen += printf(" written(%d) != read(%d)", (int)w, (int)r);
-		result(llen, FAIL);
-		return 1;
-	}
-
-	buf[r] = '\0';
 	llen += printf(" \"%s\" = \"%s\"", expected, buf);
 	ret = strncmp(expected, buf, c);
 

-- 
2.48.1