1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classListParser.hpp"
  27 #include "runtime/os.hpp"
  28 #include "runtime/java.hpp"
  29 
  30 ClassListParser::ClassListParser(const char* file) {
  31   _classlist_file = file;
  32   _file = fopen(file, "r");
  33   if (_file == NULL) {
  34     char errmsg[JVM_MAXPATHLEN];
  35     os::lasterror(errmsg, JVM_MAXPATHLEN);
  36     vm_exit_during_initialization("Loading classlist failed", errmsg);
  37   }
  38 }
  39 
  40 ClassListParser::~ClassListParser() {
  41   if (_file) {
  42     fclose(_file);
  43   }
  44 }
  45 
  46 bool ClassListParser::parse_one_line() {
  47   for (;;) {
  48     if (fgets(_line, sizeof(_line), _file) == NULL) {
  49       return false;
  50     }
  51     int line_len = (int)strlen(_line);
  52     if (line_len > _max_allowed_line_len) {
  53       tty->print_cr("input line too long (must be no longer than %d chars)", _max_allowed_line_len);
  54       vm_exit_during_initialization("Loading classlist failed");
  55     }
  56     if (*_line == '#') { // comment
  57       continue;
  58     }
  59     break;
  60   }
  61 
  62   // Remove trailing \r\n
  63   _line[strcspn(_line, "\r\n")] = 0;
  64   return true;
  65 }
  66