main: add parameter parsing

Only has a help message for now.

diff --git a/main.cc b/main.cc
index 75efafed43870f8be079fc8fcb1cb49bd8412706..f58f3040d98f0afd3240381445b6de93cbf723b6 100644 (file)
--- a/main.cc
+++ b/main.cc
@@ -2,6 +2,8 @@
  *  @brief Entry point for the model checker.
  */
 
+#include <unistd.h>
+
 #include "libthreads.h"
 #include "common.h"
 #include "threads.h"
@@ -12,7 +14,32 @@
 #include "model.h"
 #include "snapshot-interface.h"
 
+static void print_usage() {
+       printf(
+"Usage: <program name> [OPTIONS]\n"
+"\n"
+"Options:\n"
+"-h                    Display this help message and exit\n"
+);
+       exit(EXIT_SUCCESS);
+}
+
 static void parse_options(struct model_params *params, int argc, char **argv) {
+       const char *shortopts = "h";
+       int opt;
+       bool error = false;
+       while (!error && (opt = getopt(argc, argv, shortopts)) != -1) {
+               switch (opt) {
+               case 'h':
+                       print_usage();
+                       break;
+               default: /* '?' */
+                       error = true;
+                       break;
+               }
+       }
+       if (error)
+               print_usage();
 }
 
 int main_argc;