From: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Date: Fri, 11 Apr 2025 09:00:47 +0000 (+0200)
Subject: tools/nolibc: add dprintf() and vdprintf()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5197b7b87cbfeed61b69ff54532bb58a0d55cb0b;p=users%2Fdwmw2%2Flinux.git

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@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
---

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index b32b8b7940152..262d0da4da906 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)
 {