Move opts/ into util/opts/

util/opts/control.c

@@ -0,0 +1,26 @@
+#include "control.h"
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+int device_option_normalize_name(const char *in, char *outp)
+{
+  // The output is always shorter, so `outp=in`
+  // colour_correction_matrix => colourcorrectionmatrix
+  // Colour Correction Matrix => colourcorrectionmatrix
+  // ColourCorrectionMatrix => colourcorrectionmatrix
+
+  char *out = outp;
+
+  while (*in) {
+    if (isalnum(*in)) {
+      *out++ = tolower(*in++);
+    } else {
+      in++;
+    }
+  }
+
+  *out++ = 0;
+  return out - outp;
+}