1 files changed, 84 insertions, 0 deletions
diff --git a/src/omg.c b/src/omg.c
new file mode 100644
index 0000000..b289c2c
--- /dev/null
+++ b/src/omg.c
@@ -0,0 +1,84 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "util/versie.h"
+
+static void usage(FILE *f) {
+  fprintf(f,
+      "Gebruik: omg [-hV] [NAAM=WAARDE]... [COMMANDO]...\n"
+      "\n"
+      "TODO \n"
+      "\n"
+      "  -h          Toon deze hulptekst\n"
+      "  -V          Toon versienummer\n");
+}
+
+// Returns pointer to argument array containing the variables to set and the
+// command to execute and its arguments
+static char** parse_options(int argc, char **argv) {
+  int opt;
+  while ((opt = getopt(argc, argv, "hV")) != -1) {
+    switch (opt) {
+      case 'h':
+        usage(stdout);
+        exit(0);
+
+      case 'V':
+        drukkedoos_print_versie(stdout);
+        exit(0);
+
+      case '?':
+        fprintf(stderr, "omg: Ongeldige optie: -%c\n", optopt);
+        usage(stderr);
+        exit(1);
+    }
+  }
+
+  return argv + optind;
+}
+
+
+int entry_omg(int argc, char **argv) {
+  char **args = parse_options(argc, argv);
+
+  while (*args != NULL) {
+    if (strchr(*args, '=') == NULL) {
+      break;
+    }
+
+    char *name = strtok(*args, "=");
+    char *value = strtok(NULL, "=");
+
+    if (value == NULL) {
+      fprintf(stderr, "omg: geen waarde gegeven voor sleutel '%s'\n", name);
+      return 1;
+    }
+
+    errno = 0;
+    if (setenv(name, value, true) == -1) {
+      fprintf(stderr, "omg: kon omgeving niet aanpassen: %s\n", strerror(errno));
+    }
+
+    args++;
+  }
+
+  if (*args == NULL) {
+    while (*environ != NULL) {
+      printf("%s\n", *environ);
+      environ++;
+    }
+
+    return 0;
+  }
+
+  errno = 0;
+  execvp(args[0], args);
+  fprintf(stderr, "omg: kon proces niet starten: %s\n", strerror(errno));
+
+  return 1;
+}