3 files changed, 8 insertions, 3 deletions
diff --git a/src/kernel/user/vfs.c b/src/kernel/user/vfs.c
index fa226f8..0cb7f3f 100644
--- a/src/kernel/user/vfs.c
+++ b/src/kernel/user/vfs.c
@@ -497,6 +497,8 @@ void unref_file(fs_handle_t *file) {
 }
 
 size_t file_read(fs_handle_t *f, size_t offset, size_t len, char* buf) {
+	if (len == 0) return 0;
+
 	if (!(f->mode & FM_READ)) return 0;
 
 	if (f->node->ops->read == 0) return 0;
@@ -505,6 +507,8 @@ size_t file_read(fs_handle_t *f, size_t offset, size_t len, char* buf) {
 }
 
 size_t file_write(fs_handle_t *f, size_t offset, size_t len, const char* buf) {
+	if (len == 0) return 0;
+
 	if (!(f->mode & FM_WRITE)) return 0;
 
 	if (f->node->ops->write == 0) return 0;
diff --git a/src/lib/include/stdio.h b/src/lib/include/stdio.h
index 4b300da..b51bee4 100644
--- a/src/lib/include/stdio.h
+++ b/src/lib/include/stdio.h
@@ -4,6 +4,8 @@
 #include <stdarg.h>
 #include <stdint.h>
 
+extern fd_t stdio;
+
 void putchar(int c);
 void puts(char* s);
 void printf(char* arg, ...);
diff --git a/src/sysbin/shell/main.c b/src/sysbin/shell/main.c
index 2eb2c6c..b093430 100644
--- a/src/sysbin/shell/main.c
+++ b/src/sysbin/shell/main.c
@@ -33,8 +33,7 @@ void cat(char* file) {
 		while (true) {
 			size_t r = read(f, p, 128, buf);
 			p += r;
-			buf[r] = 0;
-			puts(buf);
+			write(stdio, 0, r, buf);
 			if (r < 128) break;
 		}
 		close(f);
@@ -46,7 +45,7 @@ void cat(char* file) {
 int main(int argc, char **argv) {
 	dbg_printf("[shell] Starting\n");
 
-	fctl(1, FC_SET_BLOCKING, 0);
+	fctl(stdio, FC_SET_BLOCKING, 0);
 
 	puts("Kogata shell.\n");