feat(\db-tool\): introduce unified db-tool package with postgres harness and tests (T0-T8)

package/parse-uri/main.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <libpq-fe.h>
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+      printf("only 1 argument allow, please provide uri\n");
+      exit(1);
+    }
+    const char *conninfo = argv[1];
+    char *errmsg = NULL;
+
+    PQconninfoOption *options = PQconninfoParse(conninfo, &errmsg);
+    if (!options) {
+        printf("Parse failed: %s\n", errmsg);
+        return 1;
+    }
+
+    for (PQconninfoOption *opt = options; opt->keyword != NULL; opt++) {
+        char upper[128];
+        size_t i = 0;
+        for (; opt->keyword[i] != '\0' && i < sizeof(upper)-1; i++)
+            upper[i] = toupper((unsigned char)opt->keyword[i]);
+        upper[i] = '\0';
+
+        printf("URI_%s=%s\n", upper, opt->val ? opt->val : "");
+    }
+
+    PQconninfoFree(options);
+    return 0;
+}