add libc building to agbcc.

1 files changed, 63 insertions, 0 deletions

diff --git a/libc/reent/readr.c b/libc/reent/readr.c
new file mode 100644
index 0000000..e3deca9
--- /dev/null
+++ b/libc/reent/readr.c
@@ -0,0 +1,63 @@
+/* Reentrant versions of read 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
+	<<_read_r>>---Reentrant version of read
+	
+INDEX
+	_read_r
+
+ANSI_SYNOPSIS
+	#include <reent.h>
+	long _read_r(struct _reent *<[ptr]>,
+		     int <[fd]>, void *<[buf]>, size_t <[cnt]>);
+
+TRAD_SYNOPSIS
+	#include <reent.h>
+	long _read_r(<[ptr]>, <[fd]>, <[buf]>, <[cnt]>)
+	struct _reent *<[ptr]>;
+	int <[fd]>;
+	char *<[buf]>;
+	size_t <[cnt]>;
+
+DESCRIPTION
+	This is a reentrant version of <<read>>.  It
+	takes a pointer to the global data block, which holds
+	<<errno>>.
+*/
+
+long
+_read_r (ptr, fd, buf, cnt)
+     struct _reent *ptr;
+     int fd;
+     _PTR buf;
+     size_t cnt;
+{
+  long ret;
+
+  errno = 0;
+  if ((ret = _read (fd, buf, cnt)) == -1 && errno != 0)
+    ptr->_errno = errno;
+  return ret;
+}
+
+#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */