1 files changed, 125 insertions, 0 deletions
diff --git a/src/uci/command.c b/src/uci/command.c
new file mode 100644
index 0000000..d82c50c
--- /dev/null
+++ b/src/uci/command.c
@@ -0,0 +1,125 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include "command.h"
+
+ucicmd ucicmd_init() {
+  ucicmd output = {0};
+
+  output.empty = true;
+  output.args_capacity = 32;
+  output.args = calloc(sizeof(char) * MAX_TOKEN_SIZE, output.args_capacity);
+
+  return output;
+}
+
+bool is_valid_cmd(const char *token) {
+  return
+    (strcmp(token, "uci") == 0) ||
+    (strcmp(token, "debug") == 0) ||
+    (strcmp(token, "isready") == 0) ||
+    (strcmp(token, "setoption") == 0) ||
+    (strcmp(token, "register") == 0) ||
+    (strcmp(token, "ucinewgame") == 0) ||
+    (strcmp(token, "position") == 0) ||
+    (strcmp(token, "go") == 0) ||
+    (strcmp(token, "stop") == 0) ||
+    (strcmp(token, "ponderhit") == 0) ||
+    (strcmp(token, "quit") == 0) ||
+
+    (strcmp(token, "id") == 0) ||
+    (strcmp(token, "uciok") == 0) ||
+    (strcmp(token, "readyok") == 0) ||
+    (strcmp(token, "bestmove") == 0) ||
+    (strcmp(token, "copyprotection") == 0) ||
+    (strcmp(token, "registration") == 0) ||
+    (strcmp(token, "info") == 0) ||
+    (strcmp(token, "option") == 0);
+}
+
+void ucicmd_add(ucicmd* cmd, const char* token) {
+  if (!cmd->empty) {
+    ucicmd_append_arg(cmd, token);
+    return;
+  }
+  if (is_valid_cmd(token) == 0) return;
+  ucicmd_set_root(cmd, token);
+}
+
+void ucicmd_set_root(ucicmd* cmd, const char* token) {
+  cmd->empty = false;
+  int i = 0;
+  for (; token[i] != 0; i++) {
+    assert(i < MAX_TOKEN_SIZE);
+    cmd->root[i] = token[i];
+  }
+  if (i < MAX_TOKEN_SIZE) cmd->root[i] = 0;
+}
+
+void ucicmd_append_arg(ucicmd* cmd, const char* token) {
+  if (cmd->args_count + 1 > cmd->args_capacity) {
+    cmd->args_capacity += 32;
+    // does realloc set all zeros, like calloc???
+    // NO: https://stackoverflow.com/questions/61237721/does-a-realloc-after-a-calloc-zero-out-bytes
+    cmd->args = realloc(
+      cmd->args,
+      sizeof(char) * MAX_TOKEN_SIZE * cmd->args_capacity
+    );
+    memset(
+      ucicmd_get_arg(*cmd, cmd->args_capacity - 32),
+      0,
+      32 * MAX_TOKEN_SIZE
+    );
+  }
+
+  int shift = cmd->args_count++ * sizeof(char) * MAX_TOKEN_SIZE;
+  int i = 0;
+  for (; token[i] != 0; i++) {
+    assert(i < MAX_TOKEN_SIZE);
+    cmd->args[shift + i] = token[i];
+  }
+  if (i < MAX_TOKEN_SIZE) cmd->args[shift + i] = 0;
+}
+
+char* ucicmd_get_arg(ucicmd cmd, int i) {
+  return cmd.args + i * MAX_TOKEN_SIZE;
+}
+
+void ucicmd_deinit(ucicmd cmd) {
+  free(cmd.args);
+}
+
+
+#ifdef TEST_MOD
+#include <stdbool.h>
+#include <string.h>
+
+bool test_ucicmd() {
+  ucicmd cmd = ucicmd_init();
+  ucicmd_set_root(&cmd, "root");
+  ucicmd_append_arg(&cmd, "arg1");
+  ucicmd_append_arg(&cmd, "arg2");
+  ucicmd_append_arg(&cmd, "arg3");
+
+  if (strncmp(cmd.root, "root", MAX_TOKEN_SIZE) != 0) return false;
+  if (strncmp(ucicmd_get_arg(cmd, 0), "arg1", MAX_TOKEN_SIZE) != 0)
+    return false;
+  if (strncmp(ucicmd_get_arg(cmd, 1), "arg2", MAX_TOKEN_SIZE) != 0)
+    return false;
+  if (strncmp(ucicmd_get_arg(cmd, 2), "arg3", MAX_TOKEN_SIZE) != 0)
+    return false;
+  return true;
+}
+
+bool test_invalid_cmd_ucicmd() {
+  ucicmd cmd = ucicmd_init();
+  ucicmd_add(&cmd, "john");
+  ucicmd_add(&cmd, "debug");
+  ucicmd_add(&cmd, "on");
+
+  if (strncmp(cmd.root, "debug", MAX_TOKEN_SIZE) != 0) return false;
+  if (strncmp(ucicmd_get_arg(cmd, 0), "on", MAX_TOKEN_SIZE) != 0)
+    return false;
+  return true;
+}
+#endif