fixed #1

syscalls/syscalls.c

@@ -0,0 +1,48 @@
+/*
+ * syscalls.c
+ *
+ *  Created on: Dec 14, 2014
+ *      Author: Mario Huettel <mario.huettel@gmx.net>
+ */
+
+#include <uart/uart.h>
+
+char* _sbrk(int incr) {
+            extern char heap_low;    // Defined by the linker
+            extern char heap_top;
+            static char *heap_end;
+            char *prev_heap_end;
+
+            if (heap_end == 0) {
+              heap_end = &heap_low;
+            }
+            prev_heap_end = heap_end;
+            if (heap_end + incr > &heap_top) {
+              return 0;
+            }
+
+            heap_end += incr;
+            return (char*) prev_heap_end;
+          }
+int _isatty(int fd) {
+	return 1;
+}
+int _close(int fd) {
+	return 0;
+}
+int _open(int fd) {
+	return 0;
+}
+int _fstat(void) {
+	return 0;
+}
+int _lseek(void) {
+	return 0;
+}
+int _read(void) {
+	return 0;
+}
+int _write(int fd, const void *buf, int count) {
+	sendString((char*)buf, count);
+	return count;
+}