case '\v': strcpy(buf, "\\v"); break;
case '\f': strcpy(buf, "\\f"); break;
case '\r': strcpy(buf, "\\r"); break;
+ case '\\': strcpy(buf, "\\\\"); break;
case '\'': strcpy(buf, str ? "'" : "\\'"); break;
case '"': strcpy(buf, str ? "\\\"" : "\""); break;
default: