87 lines
2.0 KiB
C++
87 lines
2.0 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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#include "Exception.hxx"
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#include "CharUtil.hxx"
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#include "StringStrip.hxx"
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#include <utility>
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/**
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* Append the given C string to a std::string, with some
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* sanitizations: strip whitespace at the beginning and the end and
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* combine multiple whitespace to a single space.
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*
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* This shall compress strangely formatted multi-line messages (which
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* may come from third-party libraries) to a single line.
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*/
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static void
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AppendSanitize(std::string &dest, const char *src) noexcept
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{
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src = StripLeft(src);
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bool space = false;
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while (char ch = *src++) {
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if (IsWhitespaceFast(ch)) {
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space = true;
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continue;
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}
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if (space) {
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space = false;
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dest.push_back(' ');
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}
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dest.push_back(ch);
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}
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}
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template<typename T>
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static void
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AppendNestedMessage(std::string &result, T &&e,
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const char *fallback, const char *separator) noexcept
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{
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try {
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std::rethrow_if_nested(std::forward<T>(e));
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} catch (const std::exception &nested) {
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result += separator;
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AppendSanitize(result, nested.what());
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AppendNestedMessage(result, nested, fallback, separator);
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} catch (const std::nested_exception &ne) {
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AppendNestedMessage(result, ne, fallback, separator);
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} catch (const char *s) {
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result += separator;
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AppendSanitize(result, s);
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} catch (...) {
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result += separator;
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result += fallback;
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}
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}
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std::string
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GetFullMessage(const std::exception &e,
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const char *fallback, const char *separator) noexcept
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{
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std::string result;
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AppendSanitize(result, e.what());
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AppendNestedMessage(result, e, fallback, separator);
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return result;
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}
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std::string
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GetFullMessage(std::exception_ptr ep,
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const char *fallback, const char *separator) noexcept
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{
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try {
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std::rethrow_exception(std::move(ep));
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} catch (const std::exception &e) {
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return GetFullMessage(e, fallback, separator);
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} catch (const std::nested_exception &ne) {
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return GetFullMessage(ne.nested_ptr(), fallback, separator);
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} catch (const char *s) {
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return s;
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} catch (...) {
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return fallback;
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}
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}
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