1 files changed, 16 insertions, 20 deletions

diff --git a/user/chat.c b/user/chat.c
index 1657c73..7a1d5c8 100644
--- a/user/chat.c
+++ b/user/chat.c
@@ -1,32 +1,28 @@
-#include "user.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
 
-void _start(const char* arg, unsigned long arglen)
+int main(int argc, char** argv)
 {
-    if (arglen == 0)
+    if (argc < 2)
     {
-        put("usage: run chat <path>\n");
-        sys_exit(1);
+        printf("usage: run chat <path>\n");
+        return 1;
     }
 
-    char path[128];
-    unsigned long i = 0;
-    for (; i < arglen && i < sizeof(path) - 1; i++)
-        path[i] = arg[i];
-    path[i] = 0;
-
-    long fd = sys_open(path, 0);
+    const char* path = argv[1];
+    int fd = open(path, O_RDONLY);
     if (fd < 0)
     {
-        put("chat: ");
-        put(path);
-        put(": cannot open\n");
-        sys_exit(1);
+        printf("chat: %s: cannot open\n", path);
+        return 1;
     }
 
     char buffer[256];
     long bytes_read;
-    while ((bytes_read = sys_read(fd, buffer, sizeof(buffer))) > 0)
-        (void)sys_write(1, buffer, (unsigned long)bytes_read);
-    (void)sys_close(fd);
-    sys_exit(0);
+    while ((bytes_read = read(fd, buffer, sizeof(buffer))) > 0)
+        write(1, buffer, (unsigned long)bytes_read);
+
+    close(fd);
+    return 0;
 }