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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <errno.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30 
  31 #include "jdk_strerror.h"
  32 
  33 int
  34 jdk_strerror(int err, char *buf, size_t len)
  35 {
  36     int ret = 0;
  37     
  38     if (err == 0 || len < 1) return 0;
  39 
  40 #if defined(__linux__) && (defined(_GNU_SOURCE) || \
  41         (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE < 200112L \
  42             && defined(_XOPEN_SOURCE) && _XOPEN_SOURCE < 600))
  43 
  44     const char *msg;
  45     char tmpbuf[1024];
  46     msg = strerror_r (errno, tmpbuf, (size_t) 1024);
  47 
  48     size_t n = strlen(msg);
  49     if (n >= len) {
  50         n = len - 1;
  51         ret = ERANGE;
  52     }
  53 
  54     strncpy(buf, msg, n);
  55     buf[n] = '\0';
  56 
  57     if (strncmp(msg, "Unknown error", 13) == 0)
  58         ret = EINVAL;
  59 
  60 #elif _WIN32
  61     ret = strerror_s(buf, len, err);
  62 #else
  63     ret = strerror_r (err, buf, len);
  64 #endif
  65 
  66     return ret;
  67 }