Add color options, bump minor version

lib/options.c

@@ -0,0 +1,55 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "options.h"
+
+mazeoptions_t* mazemaker_options_new() {
+    mazeoptions_t* result = malloc(sizeof(mazeoptions_t));
+
+    // set defaults
+    memset(result->wall_color, 0, 3);
+    memset(result->background_color, 0xff, 3);
+
+    return result;
+}
+
+void mazemaker_options_free(mazeoptions_t* options) {
+    free(options);
+}
+
+static int stringToColor(char const* color_desc, rgb_color_t dst) {
+    if (color_desc[0] != '#') return -1; // bad format
+
+    size_t l;
+    for (l = 1; color_desc[l] != '\0'; l++) if (!isxdigit(color_desc[l])) return -1; // bad format
+
+    if ((l != 4) && (l != 7)) return -1; // bad format
+
+    char x2[3] = { 0, 0, 0};
+    if (l == 4) {
+        x2[0] = x2[1] = color_desc[1];
+        sscanf(x2, "%hhx", &dst[0]);
+        x2[0] = x2[1] = color_desc[2];
+        sscanf(x2, "%hhx", &dst[1]);
+        x2[0] = x2[1] = color_desc[3];
+        sscanf(x2, "%hhx", &dst[2]);
+    } else {
+        strncpy(x2, color_desc + 1, 2);
+        sscanf(x2, "%hhx", &dst[0]);
+        strncpy(x2, color_desc + 3, 2);
+        sscanf(x2, "%hhx", &dst[1]);
+        strncpy(x2, color_desc + 5, 2);
+        sscanf(x2, "%hhx", &dst[2]);
+    }
+    return 0;
+}
+
+int mazemaker_options_set_wall_color(mazeoptions_t* options, char const* color_desc) {
+    return stringToColor(color_desc, options->wall_color);
+}
+
+int mazemaker_options_set_background_color(mazeoptions_t* options, char const* color_desc) {
+    return stringToColor(color_desc, options->background_color);
+}
+