1 files changed, 36 insertions, 0 deletions
diff --git a/user/usr/bin/args.c b/user/usr/bin/args.c
new file mode 100644
index 0000000..e10e821
--- /dev/null
+++ b/user/usr/bin/args.c
@@ -0,0 +1,36 @@
+/*
+ * Does some basic checks to make sure arguments are
+ * being passed to userland programs correctly.
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char **argv, char **envp)
+{
+    int i;
+    char buf[100];
+
+    open("/dev/tty0", O_RDONLY, 0);
+    open("/dev/tty0", O_WRONLY, 0);
+
+    snprintf(buf, sizeof(buf), "Arguments: (argc = %d, argv = %p)\n", argc,
+             argv);
+    write(1, buf, strlen(buf));
+    for (i = 0; argv[i]; i++)
+    {
+        snprintf(buf, sizeof(buf), "  %d \"%s\"\n", i, argv[i]);
+        write(1, buf, strlen(buf));
+    }
+    snprintf(buf, sizeof(buf), "Environment: (envp = %p)\n", envp);
+    write(1, buf, strlen(buf));
+    for (i = 0; envp[i]; i++)
+    {
+        snprintf(buf, sizeof(buf), "  %d \"%s\"\n", i, envp[i]);
+        write(1, buf, strlen(buf));
+    }
+
+    return 0;
+}