use spprintf instead (no need to estrdup afterwards).

ext/pdo_dblib/dblib_stmt.c

@@ -205,15 +205,14 @@ static int pdo_dblib_stmt_describe(pdo_stmt_t *stmt, int colno TSRMLS_DC)
 	struct pdo_column_data *col = &stmt->columns[colno];
 
 	char *fname = (char*)dbcolname(H->link, colno+1);
-	char computed_buf[16];
+
 	if (fname && *fname) {
 		col->name = estrdup(fname);
+		col->namelen = strlen(col->name);
 	} else {
-		snprintf(computed_buf,16,"computed%d", colno);
-		col->name = estrdup(computed_buf);
+		col->namelen = spprintf(&col->name, NULL, "computed%d", colno);
 	}
 	col->maxlen = dbcollen(H->link, colno+1);
-	col->namelen = strlen(col->name);
 	col->param_type = PDO_PARAM_STR;
 
 	return 1;