From f17df9538b1c3f58f12b738083b747ac332b8d71 Mon Sep 17 00:00:00 2001
From: Aargh Rai <aargh.rai+git@gmail.com>
Date: Sat, 4 Jul 2026 22:34:17 +0530
Subject: the setoption now changes state

i can now finally start working on how the non existant engine will
interact with uci
---
 src/uci/response.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 56 insertions(+), 7 deletions(-)

(limited to 'src/uci/response.c')

diff --git a/src/uci/response.c b/src/uci/response.c
index 1f32f55..9b3118b 100644
--- a/src/uci/response.c
+++ b/src/uci/response.c
@@ -1,13 +1,47 @@
 #include <string.h>
 #include <assert.h>
+#include <stdlib.h>
 #include "response.h"
 
+void apply_option(uci_state *state, char *name, char *buffer) {
+  int settings_count = sizeof(state->option_settings)/sizeof(option_setting_t);
+  for (int i = 0; i < settings_count; i++) {
+    option_setting_t setting = state->option_settings[i];
+
+    if (strcmp(setting.option_name, name)) continue;
+    if (OPTION_SPIN == setting.type) {
+      option_spin_setting_t data = setting.data.spin;
+      int num = atoi(buffer);
+      if (num < data.min) return;
+      if (num > data.max) return;
+      *setting.value.spin = num;
+    } else if (OPTION_COMBO == setting.type) {
+      option_combo_setting_t data = setting.data.combo;
+      for (int j = 0; j < data.count; j++) {
+        if (strcmp(data.combination[i], buffer)) continue;
+        *setting.value.combo = j;
+      }
+    } else if (OPTION_CHECK == setting.type) {
+      *setting.value.check = strcmp(buffer, "true") == 0;
+    } else if (OPTION_STRING == setting.type) {
+      free(setting.value.string->data);
+      setting.value.string->length = strlen(buffer);
+      setting.value.string->data = malloc(setting.value.string->length);
+      memcpy(setting.value.string->data, buffer, setting.value.string->length);
+    } else if (OPTION_BUTTON == setting.type) {
+      *setting.value.button = true;
+    } else { assert(0); }
+    return;
+  }
+  printf("invalid option\n");
+}
+
 // examples from uci_min.txt
-// "option name Nullmove type check default true\n"
-// "option name Selectivity type spin default 2 min 0 max 4\n"
-// "option name Style type combo default Normal var Solid var Normal var Risky\n"
-// "option name NalimovPath type string default c:\\n"
-// "option name Clear Hash type button\n"
+// option name Nullmove type check default true\n
+// option name Selectivity type spin default 2 min 0 max 4\n
+// option name Style type combo default Normal var Solid var Normal var Risky\n
+// option name NalimovPath type string default c:\\n
+// option name Clear Hash type button\n
 void print_setting(option_setting_t setting) {
   printf("option name %s type ", setting.option_name);
   // accidently did the yoda style if statement, i am keeping it
@@ -44,7 +78,6 @@ enum {
   STATE_HALT,
 };
 int current_state = STATE_INITIAL;
-int debug = false;
 
 void todo() {
   assert(0);
@@ -84,8 +117,24 @@ void handle_initial(uci_state *state, ucicmd cmd) {
 void handle_idle(uci_state *state, ucicmd cmd) {
   if (cmd.empty) return;
   if (strcmp(cmd.root, "debug") == 0) {
-    debug = strcmp(ucicmd_get_arg(cmd, 0), "on") == 0;
+    state->debug = strcmp(ucicmd_get_arg(cmd, 0), "on") == 0;
   } else if (strcmp(cmd.root, "setoption") == 0) {
+    char buffer[2048] = {0};
+    char name[64] = {0};
+    char *cursor = name;
+    for (int i = 1; i < cmd.args_count; i++) {
+      assert((long)cursor - (long)buffer < 2048);
+      char *arg = ucicmd_get_arg(cmd, i);
+      if (strcmp(arg, "value") == 0) {
+        *(--cursor) = 0;
+        cursor = buffer;
+        continue;
+      }
+      cursor = stpncpy(cursor, arg, MAX_TOKEN_SIZE);
+      *(cursor++) = ' ';
+    }
+    *(--cursor) = 0;
+    apply_option(state, name, buffer);
   } else if (strcmp(cmd.root, "ucinewgame") == 0) {
   } else if (strcmp(cmd.root, "position") == 0) {
   } else if (strcmp(cmd.root, "stop") == 0) {
-- 
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