From 2cdc815322af6c7c22b9ceb371d9c7b2a4853c0e Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Fri, 29 Jul 2022 19:06:23 +0200
Subject: syscall/write: WRITE_TRUNCATE

---
 src/user/app/init/driver/tmpfs.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

(limited to 'src/user/app/init/driver/tmpfs.c')

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;
 
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