Convert directory reading to generic stream

src/user/app/ls/ls.c

@@ -6,21 +6,28 @@
 #define PRINT_D(s) write(1, s, string_length(s));
 
 exit_code_t ls(const char *path) {
-  uint64_t i = 0;
-  while (1) {
-    char out[100];
-    uint64_t s = readdir(path, i, 100, out);
-    if (!s) {
-      return EXIT_CODE_OK;
-    }
-    if (s == (uint64_t)-1) {
-      PRINT_S("ls: path does not exist\n");
+  uint64_t fd = open(path);
+
+  if (fd == (uint64_t)-1) {
+    PRINT_S("ls: path does not exist\n");
+    return EXIT_CODE_GENERAL_FAILURE;
+  }
+
+  char buffer[100];
+  uint64_t bytes;
+  while ((bytes = read(fd, 100, buffer))) {
+    if (bytes == (uint64_t)-1) {
+      PRINT_S("ls: could not read directory\n");
+      close(fd);
       return EXIT_CODE_GENERAL_FAILURE;
     }
-    PRINT_D(out);
+    write(1, buffer, bytes - 1);
     PRINT_S("\n");
-    i++;
   }
+
+  close(fd);
+
+  return 0;
 }
 
 exit_code_t main(uint64_t argc, const char **argv) {