add libc building to agbcc.

1 files changed, 64 insertions, 0 deletions

diff --git a/libc/reent/openr.c b/libc/reent/openr.c
new file mode 100644
index 0000000..2e3b608
--- /dev/null
+++ b/libc/reent/openr.c
@@ -0,0 +1,64 @@
+/* Reentrant versions of open system call. */
+
+#include <reent.h>
+#include <unistd.h>
+#include <_syslist.h>
+
+/* Some targets provides their own versions of this functions.  Those
+   targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
+
+#ifdef _REENT_ONLY
+#ifndef REENTRANT_SYSCALLS_PROVIDED
+#define REENTRANT_SYSCALLS_PROVIDED
+#endif
+#endif
+
+#ifndef REENTRANT_SYSCALLS_PROVIDED
+
+/* We use the errno variable used by the system dependent layer.  */
+#undef errno
+extern int errno;
+
+/*
+FUNCTION
+	<<_open_r>>---Reentrant version of open
+	
+INDEX
+	_open_r
+
+ANSI_SYNOPSIS
+	#include <reent.h>
+	int _open_r(struct _reent *<[ptr]>,
+		    const char *<[file]>, int <[flags]>, int <[mode]>);
+
+TRAD_SYNOPSIS
+	#include <reent.h>
+	int _open_r(<[ptr]>, <[file]>, <[flags]>, <[mode]>)
+	struct _reent *<[ptr]>;
+	char *<[file]>;
+	int <[flags]>;
+	int <[mode]>;
+
+DESCRIPTION
+	This is a reentrant version of <<open>>.  It
+	takes a pointer to the global data block, which holds
+	<<errno>>.
+*/
+
+int
+_open_r (ptr, file, flags, mode)
+     struct _reent *ptr;
+     _CONST char *file;
+     int flags;
+     int mode;
+{
+  int ret;
+
+  errno = 0;
+  if ((ret = _open (file, flags, mode)) == -1 && errno != 0)
+    ptr->_errno = errno;
+  return ret;
+}
+
+
+#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */