add libc building to agbcc.

1 files changed, 40 insertions, 0 deletions

diff --git a/libc/stdio/fileno.c b/libc/stdio/fileno.c
new file mode 100644
index 0000000..d578c3e
--- /dev/null
+++ b/libc/stdio/fileno.c
@@ -0,0 +1,40 @@
+/*
+FUNCTION
+<<fileno>>---return file descriptor associated with stream
+
+INDEX
+	fileno
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	int fileno(FILE *<[fp]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	int fileno(<[fp]>)
+	FILE *<[fp]>;
+
+DESCRIPTION
+You can use <<fileno>> to return the file descriptor identified by <[fp]>.
+
+RETURNS
+<<fileno>> returns a non-negative integer when successful.
+If <[fp]> is not an open stream, <<fileno>> returns -1.
+
+PORTABILITY
+<<fileno>> is not part of ANSI C.
+POSIX requires <<fileno>>.
+
+Supporting OS subroutines required: none.
+*/
+
+#include <stdio.h>
+#include "local.h"
+
+int
+_DEFUN (fileno, (f),
+	FILE * f)
+{
+  CHECK_INIT (f);
+  return __sfileno (f);
+}