Function escape_replace

src/test/modules/test_escape/test_escape.c:185–209

* Escape via s/'/''/. Non-core drivers invariably wrap libpq or use this * method. It suffices iff the input passes encoding validation, so it's * marked as supports_only_valid. */

 * marked as supports_only_valid.
 */
static bool
escape_replace(PGconn *conn, PQExpBuffer target,
			   const char *unescaped, size_t unescaped_len,
			   PQExpBuffer escape_err)
{
	const char *s = unescaped;

	appendPQExpBufferChar(target, '\'');

	for (int i = 0; i < unescaped_len; i++)
	{
		char		c = *s;

		if (c == '\'')
		{
			appendPQExpBufferStr(target, "''");
		}
		else
			appendPQExpBufferChar(target, c);
		s++;
	}
	appendPQExpBufferChar(target, '\'');

	return true;
}

static bool
escape_append_literal(PGconn *conn, PQExpBuffer target,