Support a simple search path search for the shell

bin/shell/shell.c

@@ -145,6 +145,47 @@ Cmd_Spawn(int argc, const char *argv[])
     printf("Process result: %d\n", status);
 }
 
+const char *searchpath[] = {
+    "",
+    "/sbin/",
+    "/bin/",
+    "/tests/",
+    NULL
+};
+
+void
+Cmd_Run(int argc, const char *argv[])
+{
+    int i, status;
+    char path[256];
+    struct stat sb;
+
+    if (argc == 0)
+	return;
+
+    i = 0;
+    while (searchpath[i] != NULL) {
+	strcpy(path, searchpath[i]);
+	strcat(path, argv[0]);
+
+	status = OSStat(path, &sb);
+	if (status != 0) {
+	    i++;
+	    continue;
+	}
+
+	status = OSSpawn(path);
+	if (status > 100000) {
+	    printf("Spawn failed!\n");
+	}
+	status = OSWait(status);
+	printf("Process result: %d\n", status);
+	return;
+    }
+
+    printf("Unknown command '%s'\n", argv[0]);
+}
+
 void
 DispatchCommand(char *buf)
 {
@@ -193,8 +234,10 @@ DispatchCommand(char *buf)
 	Cmd_Spawn(argc, (const char **)argv);
     } else if (strcmp(argv[0], "#") == 0) {
 	// Ignore comments
-    } else if (buf[0] != '\0') {
-	printf("Unknown command '%s'\n", buf);
+    } else if (buf[0] == '\0') {
+	// Ignore empty lines
+    } else {
+	Cmd_Run(argc, (const char **)argv);
     }
 }