Parse commandline strings, move away from old env vars

libu/cmdline_parser.h

@@ -0,0 +1,36 @@
+#ifndef _LIBU_CMDLINE_PARSER_H
+#define _LIBU_CMDLINE_PARSER_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#define CMDLINE_OPT_NAME_MAX  32
+#define CMDLINE_OPT_VALUE_MAX 512
+
+#define CMDLINE_OPT_VALUE_STRING 0
+#define CMDLINE_OPT_VALUE_BOOL   1
+#define CMDLINE_OPT_VALUE_INT    2
+
+struct cmdline_opt {
+  const char* name;
+  const char* altname;
+  int type;
+  bool required;
+  void* valueptr;
+  bool end;
+  bool set;
+};
+
+#define CMDLINE_OPT(name1, altname1, type1, required1, valueptr1)                                  \
+  ((struct cmdline_opt){.name = (name1),                                                           \
+                        .altname = (altname1),                                                     \
+                        .type = (type1),                                                           \
+                        .required = (required1),                                                   \
+                        .valueptr = (valueptr1)})
+
+#define CMDLINE_END() ((struct cmdline_opt){.end = true})
+
+int cmdline_parse(const char* cmdline, struct cmdline_opt* opt_array);
+
+#endif // _LIBU_CMDLINE_PARSER_H