add more stubs.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@674 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/libc/newlib/syscalls.c

 #include <reent.h>
 #include <sys/errno.h>
+#include <rtthread.h>
 
-int _fork_r (struct _reent *r)
+int
+_fork_r (struct _reent *r)
 {
 	/* return "not supported" */
 	r->_errno = ENOTSUP;
 	return -1;
 }
 
-_ssize_t
-_read_r (struct _reent *r, int fd, void *buf, size_t nbytes)
+/*
+ * I/O routine stub
+ */
+int
+_isatty_r(struct _reent *r, int fd)
 {
 	_ssize_t rc;
 
 	rc = -1;
-
 	/* return "not supported" */
 	r->_errno = ENOTSUP;
+
+	return rc;
+}
+
+int
+_open_r(struct _reent *r, const char *file, int flags, int mode)
+{
+	int rc;
+
+	rc = open(file, flags, mode);
 	return rc;
 }
 
 _ssize_t
-_write_r (struct _reent *r, int fd, const void *buf, size_t nbytes)
+_read_r (struct _reent *r, int fd, void *buf, size_t nbytes)
 {
 	_ssize_t rc;
 
-	rc = -1;
-
-	/* return "not supported" */
-	r->_errno = ENOTSUP;
+	rc = read(fd, buf, nbytes);
 	return rc;
 }
 
-int
-_close_r (struct _reent *r, int fd)
+_ssize_t
+_write_r (struct _reent *r, int fd, const void *buf, size_t nbytes)
 {
 	_ssize_t rc;
 
-	rc = -1;
-
-	/* return "not supported" */
-	r->_errno = ENOTSUP;
+	rc = write(fd, buf, nbytes);
 	return rc;
 }
 
+int
+_close_r (struct _reent *r, int fd)
+{
+	return close(fd);
+}
+
 _off_t
 _lseek_r (struct _reent *r, int fd,  _off_t offset, int whence)
 {
-	_ssize_t rc;
+	_off_t rc;
 
-	rc = -1;
+	rc = lseek(fd, offset, whence);
+	return rc;
+}
 
+int _fstat_r (struct _reent *r, int fd, struct stat *pstat)
+{
 	/* return "not supported" */
 	r->_errno = ENOTSUP;
-	return rc;
+	return -1;
+}
+
+/*
+ * memory routine stub
+ */
+void *
+_malloc_r (struct _reent *ptr, size_t size)
+{
+	return (void*)rt_malloc (size);
+}
+
+void *
+_realloc_r (struct _reent *ptr, void *old, size_t newlen)
+{
+	return (void*)rt_realloc (old, newlen);
+}
+
+void *_calloc_r (struct _reent *ptr, size_t size, size_t len)
+{
+  return (void*)rt_calloc (size, len);
+}
+
+void 
+_free_r (struct _reent *ptr, void *addr)
+{
+	rt_free (addr);
 }