status: extend to provide all camera options and properties in JSON payload

- control: add `device_option_is_equal`
- libcamera: provide human readable configurable options
- v4l2: include camera control values
- libcamera: store all applied controls
- libcamera: use `device_option_is_equal`

util/opts/control.c

@@ -4,17 +4,23 @@
 #include <stdbool.h>
 #include <stdio.h>
 
+static bool isalnum_dot(char c)
+{
+  return isalnum(c) || c == '.';
+}
+
 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
+  // Colour.Correction.Matrix => colour.correction.matrix
 
   char *out = outp;
 
   while (*in) {
-    if (isalnum(*in)) {
+    if (isalnum_dot(*in)) {
       *out++ = tolower(*in++);
     } else {
       in++;
@@ -22,5 +28,26 @@ int device_option_normalize_name(const char *in, char *outp)
   }
 
   *out++ = 0;
-  return out - outp;
+  return out - outp - 1;
+}
+
+bool device_option_is_equal(const char *a, const char *b)
+{
+  // Similar to device_option_normalize_name
+  // but ignore case sensitiveness
+
+  while (*a || *b) {
+    while (*a && !isalnum_dot(*a))
+      a++;
+    while (*b && !isalnum_dot(*b))
+      b++;
+
+    if (tolower(*a) != tolower(*b))
+      return 0;
+
+    a++;
+    b++;
+  }
+
+  return 1;
 }

util/opts/control.h

@@ -1 +1,4 @@
+#include <stdbool.h>
+
 int device_option_normalize_name(const char *in, char *out);
+bool device_option_is_equal(const char *a, const char *b);