Stub out FILE*, stdout/stdin/stderr and implement fprintf on these

- Add FILE*
- Add stdout, stdin, stderr stubs
- Add fprintf that redirects to printf for stdout and stderr and fails otherwise

Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Acked-by: Stefan Reinauer <stefan.reinauer@coreboot.org> 


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6358 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/include/stdio.h

@@ -32,6 +32,15 @@
 
 #include <stddef.h>
 
+struct _FILE {
+} _stdout, _stdin, _stderr;
+
+typedef struct _FILE FILE;
+
+FILE *stdout = &_stdout;
+FILE *stdin = &_stdin;
+FILE *stderr = &_stderr;
+
 /**
  * @defgroup printf Print functions
  * @{
@@ -39,6 +48,7 @@
 int snprintf(char *str, size_t size, const char *fmt, ...);
 int sprintf(char *str, const char *fmt, ...);
 int printf(const char *fmt, ...);
+int fprintf(FILE *file, const char *fmt, ...);
 /** @} */
 
 void perror(const char *s);
@@ -47,5 +57,4 @@ void perror(const char *s);
 #define SEEK_CUR 1 /**< The seek offset is against the current position. */
 #define SEEK_END 2 /**< The seek offset is against the end of the file. */
 
-
 #endif

payloads/libpayload/libc/printf.c

@@ -723,6 +723,20 @@ int sprintf(char *str, const char *fmt, ...)
 	return ret;
 }
 
+int fprintf(FILE *file, const char *fmt, ...)
+{
+	int ret;
+	if ((file == stdout) || (file == stderr)) {
+		va_list args;
+		va_start(args, fmt);
+		ret = vprintf(fmt, args);
+		va_end(args);
+
+		return ret;
+	}
+	return -1;
+}
+
 struct vsnprintf_data {
 	size_t size;		/* Total space for string */
 	size_t len;		/* Count of currently used characters */