kern/arg: new module

1 files changed, 57 insertions, 0 deletions

diff --git a/kern/arg.h b/kern/arg.h
new file mode 100644
index 00000000..937f596b
--- /dev/null
+++ b/kern/arg.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Kernel command line argument parsing.
+ *
+ * Arguments are separated by spaces (there is no escape character).
+ * They can be of the form "name" when used as boolean values (present
+ * or not), or "name=value".
+ */
+
+#ifndef _KERN_ARG_H
+#define _KERN_ARG_H
+
+#include <stdbool.h>
+
+#define ARG_CMDLINE_MAX_SIZE 256
+
+/*
+ * Initialize the arg module.
+ */
+void arg_setup(const char *cmdline);
+
+/*
+ * Display command line information.
+ */
+void arg_info(void);
+
+/*
+ * Return true if an argument with the given name is present in the
+ * command line.
+ */
+bool arg_present(const char *name);
+
+/*
+ * Return the value of the argument with the given name in the command
+ * line.
+ *
+ * If the argument form is "name", the empty string is returned. If the
+ * argument isn't present, NULL is returned.
+ */
+const char * arg_value(const char *name);
+
+#endif /* _KERN_ARG_H */