linux-kernel - [PATCH 23/32] tools/nolibc: add dprintf() and vdprintf()

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Message-Id: <20250304-nolibc-kselftest-harness-v1-23-adca7cd231e2@linutronix.de>
Date: Tue, 04 Mar 2025 08:10:53 +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 23/32] tools/nolibc: add dprintf() and vdprintf()

dprintf() and vdprintf() are printf() variants printing directly into a
filedescriptor. As FILE in nolibc is based directly on filedescriptors,
the implementation is trivial.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/include/nolibc/stdio.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index b32b8b794015276ab6242c2be18f860c095f90a3..262d0da4da9062e0c83b55661b2509f36548cf88 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -351,6 +351,30 @@ int printf(const char *fmt, ...)
 	return ret;
 }
 
+static __attribute__((unused, format(printf, 2, 0)))
+int vdprintf(int fd, const char *fmt, va_list args)
+{
+	FILE *stream;
+
+	stream = fdopen(fd, NULL);
+	if (!stream)
+		return -1;
+	/* Technically 'stream' is leaked, but as it's only a wrapper around 'fd' that is fine */
+	return vfprintf(stream, fmt, args);
+}
+
+static __attribute__((unused, format(printf, 2, 3)))
+int dprintf(int fd, const char *fmt, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, fmt);
+	ret = vdprintf(fd, fmt, args);
+	va_end(args);
+	return ret;
+}
+
 static __attribute__((unused))
 int vsscanf(const char *str, const char *format, va_list args)
 {

-- 
2.48.1