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636 lines
30 KiB
HTML
636 lines
30 KiB
HTML
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*
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*
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* redistribute it and/or modify it under the terms of the GNU
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* any later version. The code is distributed WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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* may distribute non-source (e.g., minimized or compacted) forms of
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* that code without the copy of the GNU GPL normally required by
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* section 4, provided you include this license notice and a URL
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*
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<script type="text/javascript">
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/*
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@licstart The following is the entire license notice for the
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JavaScript code in this tag.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
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General Public License (GNU GPL) as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version. The code is distributed WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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As additional permission under GNU GPL version 3 section 7, you
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may distribute non-source (e.g., minimized or compacted) forms of
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that code without the copy of the GNU GPL normally required by
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section 4, provided you include this license notice and a URL
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through which recipients can access the Corresponding Source.
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@licend The above is the entire license notice
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for the JavaScript code in this tag.
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*/
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<script type="text/javascript">
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/*
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@licstart The following is the entire license notice for the
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JavaScript code in this tag.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
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General Public License (GNU GPL) as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version. The code is distributed WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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As additional permission under GNU GPL version 3 section 7, you
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may distribute non-source (e.g., minimized or compacted) forms of
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that code without the copy of the GNU GPL normally required by
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section 4, provided you include this license notice and a URL
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through which recipients can access the Corresponding Source.
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@licend The above is the entire license notice
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for the JavaScript code in this tag.
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</head>
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<body>
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<div id="org-div-home-and-up">
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<a accesskey="h" href=""> UP </a>
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<a accesskey="H" href="index.html"> HOME </a>
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</div><div id="content">
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<h1 class="title">Error handling</h1>
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<div id="table-of-contents">
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<h2>Table of Contents</h2>
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<div id="text-table-of-contents">
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<ul>
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<li><a href="#org85748f6">1. Decoding errors</a></li>
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<li><a href="#org8b59d0b">2. Data structure in context</a></li>
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<li><a href="#orgc255e72">3. Updating errors in the context</a></li>
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<li><a href="#org430f9dd">4. Get the error</a></li>
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<li><a href="#org27c2473">5. Failing</a></li>
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</ul>
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</div>
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</div>
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<div id="outline-container-org85748f6" class="outline-2">
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<h2 id="org85748f6"><span class="section-number-2">1</span> Decoding errors</h2>
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<div class="outline-text-2" id="text-1">
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<p>
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To decode the error messages, <code>qmckl_string_of_error</code> converts an
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error code into a string.
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</p>
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<pre class="example">
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128
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</pre>
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<p>
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The text strings are extracted from the previous table.
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</p>
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<div class="org-src-container">
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<pre class="src src-c"><span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #0000ff;">qmckl_string_of_error</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">error</span>) {
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<span style="color: #a020f0;">switch</span> (error) {
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<span style="color: #a020f0;">case</span> QMCKL_SUCCESS:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Success"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_1:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 1"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_2:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 2"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_3:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 3"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_4:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 4"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_5:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 5"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_6:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 6"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_7:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 7"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_8:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 8"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_9:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 9"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_10:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 10"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_11:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 11"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_12:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 12"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_13:
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<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 13"</span>;
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<span style="color: #a020f0;">break</span>;
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<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_14:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 14"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_15:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 15"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_16:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 16"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_17:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 17"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_18:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 18"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_19:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 19"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_ARG_20:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid argument 20"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_FAILURE:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Failure"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_ERRNO:
|
|
<span style="color: #a020f0;">return</span> strerror(errno);
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_CONTEXT:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid context"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_ALLOCATION_FAILED:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Allocation failed"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_DEALLOCATION_FAILED:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"De-allocation failed"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_NOT_PROVIDED:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Not provided"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_OUT_OF_BOUNDS:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Index out of bounds"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
<span style="color: #a020f0;">case</span> QMCKL_INVALID_EXIT_CODE:
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Invalid exit code"</span>;
|
|
<span style="color: #a020f0;">break</span>;
|
|
}
|
|
<span style="color: #a020f0;">return</span> <span style="color: #8b2252;">"Unknown error"</span>;
|
|
}
|
|
|
|
<span style="color: #228b22;">void</span> <span style="color: #0000ff;">qmckl_string_of_error_f</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">error</span>, <span style="color: #228b22;">char</span> <span style="color: #a0522d;">result</span>[128]) {
|
|
strncpy(result, qmckl_string_of_error(error), 128-1);
|
|
}
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-f90"><span style="color: #a020f0;">interface</span>
|
|
<span style="color: #a020f0;">subroutine</span> <span style="color: #0000ff;">qmckl_string_of_error</span> (error, string) <span style="color: #a020f0;">bind</span>(C, name=<span style="color: #8b2252;">'qmckl_string_of_error_f'</span>)
|
|
<span style="color: #a020f0;">use</span>, <span style="color: #a020f0;">intrinsic</span> :: <span style="color: #0000ff;">iso_c_binding</span>
|
|
<span style="color: #a020f0;">import</span>
|
|
<span style="color: #228b22;">integer</span> (qmckl_exit_code), <span style="color: #a020f0;">intent</span>(in), <span style="color: #a020f0;">value</span> ::<span style="color: #a0522d;"> error</span>
|
|
<span style="color: #228b22;">character</span>, <span style="color: #a020f0;">intent</span>(out) ::<span style="color: #a0522d;"> string(128)</span>
|
|
<span style="color: #a020f0;">end subroutine</span> <span style="color: #0000ff;">qmckl_string_of_error</span>
|
|
<span style="color: #a020f0;">end interface</span>
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-org8b59d0b" class="outline-2">
|
|
<h2 id="org8b59d0b"><span class="section-number-2">2</span> Data structure in context</h2>
|
|
<div class="outline-text-2" id="text-2">
|
|
<p>
|
|
The strings are declared with a maximum fixed size to avoid
|
|
dynamic memory allocation.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #483d8b;">#define</span> <span style="color: #a0522d;">QMCKL_MAX_FUN_LEN</span> 256
|
|
<span style="color: #483d8b;">#define</span> <span style="color: #a0522d;">QMCKL_MAX_MSG_LEN</span> 1024
|
|
|
|
<span style="color: #a020f0;">typedef</span> <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">qmckl_error_struct</span> {
|
|
|
|
<span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">exit_code</span>;
|
|
<span style="color: #228b22;">char</span> <span style="color: #a0522d;">function</span>[QMCKL_MAX_FUN_LEN];
|
|
<span style="color: #228b22;">char</span> <span style="color: #a0522d;">message</span> [QMCKL_MAX_MSG_LEN];
|
|
|
|
} <span style="color: #228b22;">qmckl_error_struct</span>;
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-orgc255e72" class="outline-2">
|
|
<h2 id="orgc255e72"><span class="section-number-2">3</span> Updating errors in the context</h2>
|
|
<div class="outline-text-2" id="text-3">
|
|
<p>
|
|
The error is updated in the context using <code>qmckl_set_error</code>.
|
|
When the error is set in the context, it is mandatory to specify
|
|
from which function the error is triggered, and a message
|
|
explaining the error. The exit code can't be <code>QMCKL_SUCCESS</code>.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_exit_code</span>
|
|
<span style="color: #0000ff;">qmckl_set_error</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>,
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">exit_code</span>,
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">function_name</span>,
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">message</span>)
|
|
{
|
|
/* <span style="color: #b22222;">Passing a function name and a message is mandatory. </span>*/
|
|
assert (function_name != <span style="color: #008b8b;">NULL</span>);
|
|
assert (message != <span style="color: #008b8b;">NULL</span>);
|
|
|
|
/* <span style="color: #b22222;">Exit codes are assumed valid. </span>*/
|
|
assert (exit_code >= 0);
|
|
assert (exit_code != QMCKL_SUCCESS);
|
|
assert (exit_code < QMCKL_INVALID_EXIT_CODE);
|
|
|
|
/* <span style="color: #b22222;">The context is assumed to exist. </span>*/
|
|
assert (qmckl_context_check(context) != QMCKL_NULL_CONTEXT);
|
|
|
|
qmckl_lock(context);
|
|
{
|
|
<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> = (<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) context;
|
|
assert (ctx != <span style="color: #008b8b;">NULL</span>); /* <span style="color: #b22222;">Impossible because the context is valid. </span>*/
|
|
|
|
ctx->error.exit_code = exit_code;
|
|
strncpy(ctx->error.function, function_name, QMCKL_MAX_FUN_LEN-1);
|
|
strncpy(ctx->error.message, message, QMCKL_MAX_MSG_LEN-1);
|
|
}
|
|
qmckl_unlock(context);
|
|
|
|
<span style="color: #a020f0;">return</span> QMCKL_SUCCESS;
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-org430f9dd" class="outline-2">
|
|
<h2 id="org430f9dd"><span class="section-number-2">4</span> Get the error</h2>
|
|
<div class="outline-text-2" id="text-4">
|
|
<p>
|
|
Upon error, the error type and message can be obtained from the
|
|
context using <code>qmckl_get_error</code>. The message and function name
|
|
is returned in the variables provided. Therefore, passing a
|
|
function name and message is mandatory.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_exit_code</span>
|
|
<span style="color: #0000ff;">qmckl_get_error</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>,
|
|
<span style="color: #228b22;">qmckl_exit_code</span> *<span style="color: #a0522d;">exit_code</span>,
|
|
<span style="color: #228b22;">char</span>* <span style="color: #a0522d;">function_name</span>,
|
|
<span style="color: #228b22;">char</span>* <span style="color: #a0522d;">message</span>)
|
|
{
|
|
/* <span style="color: #b22222;">Passing a function name and a message is mandatory. </span>*/
|
|
assert (function_name != <span style="color: #008b8b;">NULL</span>);
|
|
assert (message != <span style="color: #008b8b;">NULL</span>);
|
|
|
|
/* <span style="color: #b22222;">The context is assumed to exist. </span>*/
|
|
assert (qmckl_context_check(context) != QMCKL_NULL_CONTEXT);
|
|
|
|
qmckl_lock(context);
|
|
{
|
|
<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> = (<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) context;
|
|
assert (ctx != <span style="color: #008b8b;">NULL</span>); /* <span style="color: #b22222;">Impossible because the context is valid. </span>*/
|
|
|
|
strncpy(function_name, ctx->error.function, QMCKL_MAX_FUN_LEN-1);
|
|
strncpy(message , ctx->error.message , QMCKL_MAX_MSG_LEN-1);
|
|
(*exit_code) = ctx->error.exit_code;
|
|
}
|
|
qmckl_unlock(context);
|
|
|
|
<span style="color: #a020f0;">return</span> QMCKL_SUCCESS;
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-org27c2473" class="outline-2">
|
|
<h2 id="org27c2473"><span class="section-number-2">5</span> Failing</h2>
|
|
<div class="outline-text-2" id="text-5">
|
|
<p>
|
|
To make a function fail, the <code>qmckl_failwith</code> function should be
|
|
called, such that information about the failure is stored in
|
|
the context. The desired exit code is given as an argument, as
|
|
well as the name of the function and an error message. If the
|
|
message is <code>NULL</code>, then the default message obtained by
|
|
<code>qmckl_string_of_error</code> is used. The return code of the function is
|
|
the desired return code.
|
|
Upon failure, a <code>QMCKL_NULL_CONTEXT</code> is returned.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #0000ff;">qmckl_failwith</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>,
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">exit_code</span>,
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">function</span>,
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">message</span>) {
|
|
|
|
assert (exit_code > 0);
|
|
assert (exit_code < QMCKL_INVALID_EXIT_CODE);
|
|
assert (function != <span style="color: #008b8b;">NULL</span>);
|
|
assert (strlen(function) < QMCKL_MAX_FUN_LEN);
|
|
<span style="color: #a020f0;">if</span> (message != <span style="color: #008b8b;">NULL</span>) {
|
|
assert (strlen(message) < QMCKL_MAX_MSG_LEN);
|
|
}
|
|
|
|
<span style="color: #a020f0;">if</span> (qmckl_context_check(context) == QMCKL_NULL_CONTEXT)
|
|
<span style="color: #a020f0;">return</span> QMCKL_INVALID_CONTEXT;
|
|
|
|
<span style="color: #a020f0;">if</span> (message == <span style="color: #008b8b;">NULL</span>) {
|
|
<span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">rc</span> =
|
|
qmckl_set_error(context, exit_code, function, qmckl_string_of_error(exit_code));
|
|
assert (rc == QMCKL_SUCCESS);
|
|
} <span style="color: #a020f0;">else</span> {
|
|
<span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">rc</span> =
|
|
qmckl_set_error(context, exit_code, function, message);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
}
|
|
|
|
<span style="color: #a020f0;">return</span> exit_code;
|
|
}
|
|
|
|
</pre>
|
|
</div>
|
|
|
|
<p>
|
|
For example, this function can be used as
|
|
</p>
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #a020f0;">if</span> (x < 0) {
|
|
<span style="color: #a020f0;">return</span> qmckl_failwith(context,
|
|
QMCKL_INVALID_ARG_2,
|
|
<span style="color: #8b2252;">"qmckl_function"</span>,
|
|
<span style="color: #8b2252;">"Expected x >= 0"</span>);
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="postamble" class="status">
|
|
<p class="author">Author: TREX CoE</p>
|
|
<p class="date">Created: 2021-10-11 Mon 22:16</p>
|
|
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
|
|
</div>
|
|
</body>
|
|
</html>
|