3 files changed, 15 insertions, 11 deletions
diff --git a/src/user/app/init/driver/ansiterm.c b/src/user/app/init/driver/ansiterm.c
index 5daab41..0c720eb 100644
--- a/src/user/app/init/driver/ansiterm.c
+++ b/src/user/app/init/driver/ansiterm.c
@@ -84,10 +84,14 @@ void ansiterm_drv(void) {
 				break;
 
 			case VFSOP_WRITE:
-				for (size_t i = 0; i < res.len; i++)
-					in_char(buf[i]);
-				/* if (pendingFlush) */ flush();
-				_syscall_fs_respond(NULL, res.len, 0);
+				if (res.flags) {
+					_syscall_fs_respond(NULL, -1, 0);
+				} else {
+					for (size_t i = 0; i < res.len; i++)
+						in_char(buf[i]);
+					/* if (pendingFlush) */ flush();
+					_syscall_fs_respond(NULL, res.len, 0);
+				}
 				break;
 
 			default:
diff --git a/src/user/app/init/driver/tmpfs.c b/src/user/app/init/driver/tmpfs.c
index e4c079c..7bda37f 100644
--- a/src/user/app/init/driver/tmpfs.c
+++ b/src/user/app/init/driver/tmpfs.c
@@ -99,11 +99,7 @@ void tmpfs_drv(void) {
 					_syscall_fs_respond(NULL, -1, 0);
 					break;
 				}
-				if (res.len == 0) {
-					_syscall_fs_respond(NULL, 0, 0);
-					break;
-				}
-				if (!ptr->buf) {
+				if (res.len > 0 && !ptr->buf) {
 					ptr->buf = malloc(256);
 					if (!ptr->buf) {
 						_syscall_fs_respond(NULL, -1, 0);
@@ -121,8 +117,9 @@ void tmpfs_drv(void) {
 				}
 
 				memcpy(ptr->buf + res.offset, buf, res.len);
-				if (ptr->size < res.offset + res.len)
+				if ((res.flags & WRITE_TRUNCATE) || ptr->size < res.offset + res.len) {
 					ptr->size = res.offset + res.len;
+				}
 				_syscall_fs_respond(NULL, res.len, 0);
 				break;
 
diff --git a/src/user/lib/file.c b/src/user/lib/file.c
index b7e70e6..bd8cb76 100644
--- a/src/user/lib/file.c
+++ b/src/user/lib/file.c
@@ -17,13 +17,16 @@ FILE *fopen(const char *path, const char *mode) {
 	int flags = 0;
 	if (mode[0] == 'w' || mode[0] == 'a')
 		flags |= OPEN_CREATE;
-	// TODO truncate on w
 
 	h = _syscall_open(path, strlen(path), flags);
 	if (h < 0) {
 		errno = -h;
 		return NULL;
 	}
+
+	if (mode[0] == 'w')
+		_syscall_write(h, NULL, 0, 0, WRITE_TRUNCATE);
+
 	f = fdopen(h, mode);
 	if (!f) close(h);
 	return f;