add libc building to agbcc.

1 files changed, 66 insertions, 0 deletions

diff --git a/libc/reent/sbrkr.c b/libc/reent/sbrkr.c
new file mode 100644
index 0000000..7f6930e
--- /dev/null
+++ b/libc/reent/sbrkr.c
@@ -0,0 +1,66 @@
+/* Reentrant versions of sbrk system call.  This implementation just
+   calls the stat system call.  */
+
+#include <reent.h>
+#include <unistd.h>
+#include <_syslist.h>
+
+/* Some targets provides their own versions of these functions.  Those
+   targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
+
+#ifdef _REENT_ONLY
+#ifndef REENTRANT_SYSCALLS_PROVIDED
+#define REENTRANT_SYSCALLS_PROVIDED
+#endif
+#endif
+
+/* If MALLOC_PROVIDED is defined, we don't need this function.  */
+
+#if defined (REENTRANT_SYSCALLS_PROVIDED) || defined (MALLOC_PROVIDED)
+
+int _dummy_sbrk_syscalls = 1;
+
+#else
+
+/* We use the errno variable used by the system dependent layer.  */
+#undef errno
+int errno;
+
+/*
+FUNCTION
+	<<_sbrk_r>>---Reentrant version of sbrk
+	
+INDEX
+	_sbrk_r
+
+ANSI_SYNOPSIS
+	#include <reent.h>
+	void *_sbrk_r(struct _reent *<[ptr]>, size_t <[incr]>);
+
+TRAD_SYNOPSIS
+	#include <reent.h>
+	void *_sbrk_r(<[ptr]>, <[incr]>)
+	struct _reent *<[ptr]>;
+	size_t <[incr]>;
+
+DESCRIPTION
+	This is a reentrant version of <<sbrk>>.  It
+	takes a pointer to the global data block, which holds
+	<<errno>>.
+*/
+
+void *
+_sbrk_r (ptr, incr)
+     struct _reent *ptr;
+     size_t incr;
+{
+  char *ret;
+  void *_sbrk(size_t);
+
+  errno = 0;
+  if ((ret = (char *)(_sbrk (incr))) == (void *) -1 && errno != 0)
+    ptr->_errno = errno;
+  return ret;
+}
+
+#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */