changed the pkg name, added help option and corrected exit codes

1 files changed, 42 insertions, 0 deletions

diff --git a/shift-not-pressed.c b/shift-not-pressed.c
new file mode 100644
index 000000000000..3493140a188f
--- /dev/null
+++ b/shift-not-pressed.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <getopt.h>
+#include <string.h>
+#include <strings.h>
+
+int main(int argc, char **argv)
+{
+  char shift_state;
+  const char* usage =
+    "Usage: shift-not-pressed [--help]\n\n"
+    "exit codes:\n"
+    "  0 (succes) shift was not pressed\n"
+    "  1 (succes) shift was pressed\n"
+    "  2 (fail)   could not get shift state\n";
+
+  static struct option lopts[] = {
+    {"help", no_argument, NULL, 'h'}
+   };
+  int c;
+  while (1) {
+    int opti;
+    c = getopt_long(argc, argv, "h", lopts, &opti);
+    if (c == -1) {
+      break;
+    }
+    switch (c) {
+      case 'h': fprintf(stdout, "%s", usage);
+                exit(0);
+                break;
+      default: break;
+    }
+  }
+
+  shift_state = 6;
+  if (ioctl(0, TIOCLINUX, &shift_state) < 0) {
+    perror("ioctl TIOCLINUX 6 (get shift state)");
+    exit(2);
+  }
+  exit(shift_state);
+}