Added SQLite support and updated the Handbook. (0.32.0)

src/vm/sqlite/common.c

@@ -0,0 +1,49 @@
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-11-26
+ */
+
+/**
+ * SQLite handle registry and helpers
+ */
+#ifdef FUN_WITH_SQLITE
+#include <sqlite3.h>
+
+typedef struct SqlHandle {
+    int id;
+    sqlite3 *db;
+    struct SqlHandle *next;
+} SqlHandle;
+
+static SqlHandle *g_sql_handles = NULL;
+static int g_sql_next_id = 1;
+
+static SqlHandle* sql_reg_add(sqlite3 *db) {
+    SqlHandle *h = (SqlHandle*)calloc(1, sizeof(SqlHandle));
+    if (!h) return NULL;
+    h->id = g_sql_next_id++;
+    h->db = db;
+    h->next = g_sql_handles;
+    g_sql_handles = h;
+    return h;
+}
+
+static SqlHandle* sql_reg_get(int id) {
+    for (SqlHandle *p = g_sql_handles; p; p = p->next) if (p->id == id) return p;
+    return NULL;
+}
+
+static void sql_reg_del(int id) {
+    SqlHandle **pp = &g_sql_handles;
+    while (*pp) {
+        if ((*pp)->id == id) { SqlHandle *d = *pp; *pp = d->next; free(d); return; }
+        pp = &(*pp)->next;
+    }
+}
+#endif