altos: Restructure altos build to prepare for multi-arch support

[fw/altos] / src / core / ao_stdio.c

diff --git a/src/core/ao_stdio.c b/src/core/ao_stdio.c
new file mode 100644 (file)
index 0000000..c0138a3
--- /dev/null
+++ b/src/core/ao_stdio.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright © 2009 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "ao.h"
+
+/*
+ * Basic I/O functions to support SDCC stdio package
+ */
+
+#define AO_NUM_STDIOS  (HAS_USB + PACKET_HAS_SLAVE + USE_SERIAL_STDIN)
+
+__xdata struct ao_stdio ao_stdios[AO_NUM_STDIOS];
+__pdata int8_t ao_cur_stdio;
+__pdata int8_t ao_num_stdios;
+
+void
+putchar(char c)
+{
+       if (c == '\n')
+               (*ao_stdios[ao_cur_stdio].putchar)('\r');
+       (*ao_stdios[ao_cur_stdio].putchar)(c);
+}
+
+void
+flush(void)
+{
+       if (ao_stdios[ao_cur_stdio].flush)
+               ao_stdios[ao_cur_stdio].flush();
+}
+
+__xdata uint8_t ao_stdin_ready;
+
+char
+getchar(void) __reentrant __critical
+{
+       char c;
+       int8_t stdio = ao_cur_stdio;
+
+       for (;;) {
+               c = ao_stdios[stdio].pollchar();
+               if (c != AO_READ_AGAIN)
+                       break;
+               if (++stdio == ao_num_stdios)
+                       stdio = 0;
+               if (stdio == ao_cur_stdio)
+                       ao_sleep(&ao_stdin_ready);
+       }
+       ao_cur_stdio = stdio;
+       return c;
+}
+
+uint8_t
+ao_echo(void)
+{
+       return ao_stdios[ao_cur_stdio].echo;
+}
+
+int8_t
+ao_add_stdio(char (*pollchar)(void),
+            void (*putchar)(char),
+            void (*flush)(void)) __reentrant
+{
+       if (ao_num_stdios == AO_NUM_STDIOS)
+               ao_panic(AO_PANIC_STDIO);
+       ao_stdios[ao_num_stdios].pollchar = pollchar;
+       ao_stdios[ao_num_stdios].putchar = putchar;
+       ao_stdios[ao_num_stdios].flush = flush;
+       ao_stdios[ao_num_stdios].echo = 1;
+       return ao_num_stdios++;
+}