add newlib stub building script.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@702 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/libc/newlib/SConscript

+Import('env')
+Import('RTT_ROOT')
+
+# The set of source files associated with this SConscript file.
+src_local = Glob('*.c')
+
+env.Append(CPPPATH = RTT_ROOT + '/components/libc/newlib')
+
+obj = env.Object(src_local)
+Return('obj')

components/libc/newlib/syscalls.c

@@ -2,31 +2,96 @@
 #include <sys/errno.h>
 #include <rtthread.h>
 
+/* Reentrant versions of system calls.  */
+
+int
+_close_r(struct _reent *ptr, int fd)
+{
+	return close(fd);
+}
+
 int
-_fork_r (struct _reent *r)
+_execve_r(struct _reent *ptr, const char * name, char *const *argv, char *const *env)
 {
 	/* return "not supported" */
-	r->_errno = ENOTSUP;
+	ptr->_errno = ENOTSUP;
 	return -1;
 }
 
-/*
- * I/O routine stub
- */
 int
-_isatty_r(struct _reent *r, int fd)
+_fcntl_r(struct _reent *ptr, int fd, int cmd, int arg)
 {
-	_ssize_t rc;
+	/* return "not supported" */
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
 
-	rc = -1;
+int
+_fork_r(struct _reent *ptr)
+{
 	/* return "not supported" */
-	r->_errno = ENOTSUP;
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
+
+int
+_fstat_r(struct _reent *ptr, int fd, struct stat *pstat)
+{
+	/* return "not supported" */
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
+
+int
+_getpid_r(struct _reent *ptr)
+{
+	return 0;
+}
+
+int
+_isatty_r(struct _reent *ptr, int fd)
+{
+	/* return "not supported" */
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
+
+int
+_kill_r(struct _reent *ptr, int pid, int sig)
+{
+	/* return "not supported" */
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
+
+int
+_link_r(struct _reent *ptr, const char *old, const char *new)
+{
+	/* return "not supported" */
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
+
+_off_t
+_lseek_r(struct _reent *ptr, int fd, _off_t pos, int whence)
+{
+	_off_t rc;
+
+	rc = lseek(fd, pos, whence);
+	return rc;
+}
+
+int
+_mkdir_r(struct _reent *ptr, const char *name, int mode)
+{
+	int rc;
 
+	rc = mkdir(name, mode);
 	return rc;
 }
 
 int
-_open_r(struct _reent *r, const char *file, int flags, int mode)
+_open_r(struct _reent *ptr, const char *file, int flags, int mode)
 {
 	int rc;
 
@@ -35,7 +100,7 @@ _open_r(struct _reent *r, const char *file, int flags, int mode)
 }
 
 _ssize_t 
-_read_r (struct _reent *r, int fd, void *buf, size_t nbytes)
+_read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 {
 	_ssize_t rc;
 
@@ -43,40 +108,74 @@ _read_r (struct _reent *r, int fd, void *buf, size_t nbytes)
 	return rc;
 }
 
-_ssize_t
-_write_r (struct _reent *r, int fd, const void *buf, size_t nbytes)
+int
+_rename_r(struct _reent *ptr, const char *old, const char *new)
 {
-	_ssize_t rc;
+	int rc;
 
-	rc = write(fd, buf, nbytes);
+	rc = rename(old, new);
 	return rc;
 }
 
+void *
+_sbrk_r(struct _reent *ptr, ptrdiff_t incr)
+{
+	/* no use this routine to get memory */
+	return RT_NULL;
+}
+
 int
-_close_r (struct _reent *r, int fd)
+_stat_r(struct _reent *ptr, const char *file, struct stat *pstat)
 {
-	return close(fd);
+	int rc;
+
+	rc = stat(file, pstat);
+	return rc;
 }
 
-_off_t
-_lseek_r (struct _reent *r, int fd,  _off_t offset, int whence)
+_CLOCK_T_
+_times_r(struct _reent *ptr, struct tms *ptms)
 {
-	_off_t rc;
+	/* return "not supported" */
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
+
+int
+_unlink_r(struct _reent *ptr, const char *file)
+{
+	int rc;
+
+	rc = unlink(file);
+	return rc;
+}
+
+int
+_wait_r(struct _reent *ptr, int *status)
+{
+	/* return "not supported" */
+	ptr->_errno = ENOTSUP;
+	return -1;
+}
 
-	rc = lseek(fd, offset, whence);
+_ssize_t
+_write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
+{
+	_ssize_t rc;
+
+	rc = write(fd, buf, nbytes);
 	return rc;
 }
 
-int _fstat_r (struct _reent *r, int fd, struct stat *pstat)
+int
+_gettimeofday_r(struct _reent *ptr, struct timeval *__tp, void *__tzp)
 {
 	/* return "not supported" */
-	r->_errno = ENOTSUP;
+	ptr->_errno = ENOTSUP;
 	return -1;
 }
 
-/*
- * memory routine stub
- */
+/* Memory routine */
 void *
 _malloc_r (struct _reent *ptr, size_t size)
 {