[PATCH 1/2] sandbox: add function os_printf()

[Heinrich Schuchardt]

Before setting up the devices U-Boot's printf() function cannot be used
for console output. Provide function os_printf() to print to stderr.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 arch/sandbox/cpu/os.c | 13 +++++++++++++
 include/os.h          |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index d83c862182..ec1836f8f6 100644
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -11,6 +11,7 @@
 #include <getopt.h>
 #include <setjmp.h>
 #include <signal.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -51,6 +52,18 @@ ssize_t os_write(int fd, const void *buf, size_t count)
 	return write(fd, buf, count);
 }
 
+int os_printf(const char *fmt, ...)
+{
+	va_list args;
+	int i;
+
+	va_start(args, fmt);
+	i = vfprintf(stdout, fmt, args);
+	va_end(args);
+
+	return i;
+}
+
 off_t os_lseek(int fd, off_t offset, int whence)
 {
 	if (whence == OS_SEEK_SET)
diff --git a/include/os.h b/include/os.h
index 10e198cf50..148178787b 100644
--- a/include/os.h
+++ b/include/os.h
@@ -16,6 +16,13 @@
 struct rtc_time;
 struct sandbox_state;
 
+/**
+ * os_printf() - print directly to OS console
+ *
+ * @format: format string
+ */
+int os_printf(const char *format, ...);
+
 /**
  * Access to the OS read() system call
  *
-- 
2.34.1