1 files changed, 27 insertions, 0 deletions
diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index df5717d59182..c470d334ef3f 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -13,6 +13,7 @@
 #include "std.h"
 #include "arch.h"
 #include "errno.h"
+#include "fcntl.h"
 #include "types.h"
 #include "sys.h"
 #include "stdarg.h"
@@ -55,6 +56,32 @@ FILE *fdopen(int fd, const char *mode __attribute__((unused)))
 	return (FILE*)(intptr_t)~fd;
 }
 
+static __attribute__((unused))
+FILE *fopen(const char *pathname, const char *mode)
+{
+	int flags, fd;
+
+	switch (*mode) {
+	case 'r':
+		flags = O_RDONLY;
+		break;
+	case 'w':
+		flags = O_WRONLY | O_CREAT | O_TRUNC;
+		break;
+	case 'a':
+		flags = O_WRONLY | O_CREAT | O_APPEND;
+		break;
+	default:
+		SET_ERRNO(EINVAL); return NULL;
+	}
+
+	if (mode[1] == '+')
+		flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
+
+	fd = open(pathname, flags, 0666);
+	return fdopen(fd, mode);
+}
+
 /* provides the fd of stream. */
 static __attribute__((unused))
 int fileno(FILE *stream)