1 files changed, 69 insertions, 0 deletions
diff --git a/src/aardig.c b/src/aardig.c
new file mode 100644
index 0000000..a56f52d
--- /dev/null
+++ b/src/aardig.c
@@ -0,0 +1,69 @@
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include "util/versie.h"
+#include "util/error.h"
+#include "util/debug.h"
+#include "util/map.h"
+
+static void usage(FILE *f) {
+  fprintf(f,
+      "Gebruik: aardig [-n AARDIGHEID] COMMANDO...\n"
+      "\n"
+      "Voer COMMANDO uit met een bepaalde niveau van aardigheid.\n"
+      "\n"
+      "  -n AARDIGHEID   Niveau van aardigheid (standaard 10)\n"
+      "  -h              Toon deze hulptekst\n"
+      "  -V              Toon versienummer\n");
+}
+
+// Returns pointer to argument array containing the command arguments
+static char** parse_options(int argc, char **argv, int *niceness) {
+  int opt;
+  while ((opt = getopt(argc, argv, "n:hV")) != -1) {
+    switch (opt) {
+      case 'n':
+        *niceness = atoi(optarg);
+        break;
+
+      case 'h':
+        usage(stdout);
+        exit(0);
+
+      case 'V':
+        drukkedoos_print_versie(stdout, "aardig");
+        exit(0);
+
+      case '?':
+        usage(stderr);
+        exit(1);
+    }
+  }
+
+  return argv + optind;
+}
+
+int entry_aardig(int argc, char **argv) {
+  int niceness = 10;
+  char **args = parse_options(argc, argv, &niceness);
+
+  if (*args == NULL) {
+      fprintf(stderr, "aardig: geen commando opgegeven\n");
+      return 1;
+  }
+
+  if (nice(niceness) == -1 && errno) {
+    fprintf(stderr, "aardig: kon niet aardig worden.\n");
+    return 1;
+  }
+
+  execvp(args[0], args);
+
+  return 0;
+}