1 /*
2 * Copyright 2016-2018 Max Kellermann <max.kellermann@gmail.com>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the
14 * distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "Exception.hxx"
31
32 #include <utility>
33
34 template<typename T>
35 static void
AppendNestedMessage(std::string & result,T && e,const char * fallback,const char * separator)36 AppendNestedMessage(std::string &result, T &&e,
37 const char *fallback, const char *separator) noexcept
38 {
39 try {
40 std::rethrow_if_nested(std::forward<T>(e));
41 } catch (const std::exception &nested) {
42 result += separator;
43 result += nested.what();
44 AppendNestedMessage(result, nested, fallback, separator);
45 } catch (const std::nested_exception &ne) {
46 AppendNestedMessage(result, ne, fallback, separator);
47 } catch (const char *s) {
48 result += separator;
49 result += s;
50 } catch (...) {
51 result += separator;
52 result += fallback;
53 }
54 }
55
56 std::string
GetFullMessage(const std::exception & e,const char * fallback,const char * separator)57 GetFullMessage(const std::exception &e,
58 const char *fallback, const char *separator) noexcept
59 {
60 std::string result = e.what();
61 AppendNestedMessage(result, e, fallback, separator);
62 return result;
63 }
64
65 std::string
GetFullMessage(std::exception_ptr ep,const char * fallback,const char * separator)66 GetFullMessage(std::exception_ptr ep,
67 const char *fallback, const char *separator) noexcept
68 {
69 try {
70 std::rethrow_exception(std::move(ep));
71 } catch (const std::exception &e) {
72 return GetFullMessage(e, fallback, separator);
73 } catch (const std::nested_exception &ne) {
74 return GetFullMessage(ne.nested_ptr(), fallback, separator);
75 } catch (const char *s) {
76 return s;
77 } catch (...) {
78 return fallback;
79 }
80 }
81