8 files changed, 43 insertions, 0 deletions
diff --git a/os/src/close.c b/os/src/close.c
new file mode 100644
index 0000000..46ee8c5
--- /dev/null
+++ b/os/src/close.c
@@ -0,0 +1,4 @@
+#include <reent.h>
+
+int _close_r(struct _reent * reent, int fd) {
+}
diff --git a/os/src/fclose.c b/os/src/fclose.c
new file mode 100644
index 0000000..fe81f62
--- /dev/null
+++ b/os/src/fclose.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+#include <reent.h>
+
+int fclose(FILE * fp) {
+    return _fclose_r(_impure_ptr, fp);
+}
diff --git a/os/src/free.c b/os/src/free.c
new file mode 100644
index 0000000..f2d1fe5
--- /dev/null
+++ b/os/src/free.c
@@ -0,0 +1,5 @@
+#include <reent.h>
+
+void free(void * ptr) {
+    _free_r(_impure_ptr, ptr);
+}
diff --git a/os/src/lseek.c b/os/src/lseek.c
new file mode 100644
index 0000000..1b86dbb
--- /dev/null
+++ b/os/src/lseek.c
@@ -0,0 +1,4 @@
+#include <reent.h>
+
+_off_t _lseek_r(struct _reent * reent, int fd, _off_t seek, int wheel) {
+}
diff --git a/os/src/malloc.c b/os/src/malloc.c
new file mode 100644
index 0000000..7d5f965
--- /dev/null
+++ b/os/src/malloc.c
@@ -0,0 +1,5 @@
+#include <reent.h>
+
+void * malloc(size_t size) {
+    return _malloc_r(_impure_ptr, size);
+}
diff --git a/os/src/read.c b/os/src/read.c
new file mode 100644
index 0000000..08351a7
--- /dev/null
+++ b/os/src/read.c
@@ -0,0 +1,5 @@
+#include <reent.h>
+
+_ssize_t _read_r(struct _reent * reent, int fd, void * ptr, size_t size) {
+    return 0;
+}
diff --git a/os/src/sprintf.c b/os/src/sprintf.c
new file mode 100644
index 0000000..76ea9a2
--- /dev/null
+++ b/os/src/sprintf.c
@@ -0,0 +1,10 @@
+#include <reent.h>
+#include <stdarg.h>
+
+int sprintf(char * str, const char * fmt, ...) {
+    int r;
+    va_list ap;
+    va_start(ap, fmt);
+    r = _vsprintf_r(_impure_ptr, str, fmt, ap);
+    va_end(ap);
+}
diff --git a/os/src/write.c b/os/src/write.c
new file mode 100644
index 0000000..a1bf474
--- /dev/null
+++ b/os/src/write.c
@@ -0,0 +1,4 @@
+#include <reent.h>
+
+_ssize_t _write_r(struct _reent * reent, int fd, const void * buf, size_t size) {
+}