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authorBent Bisballe Nyeng <deva@aasimon.org>2025-02-01 16:24:07 +0100
committerBent Bisballe Nyeng <deva@aasimon.org>2025-02-01 16:24:07 +0100
commit69d66ac41ab66a5a5da007ccfacc1d5a9d45d819 (patch)
treea6f06af7cbe3acca9dea8bfb38d17705cd158d58 /src/pointerlist.cc
parent1334ca42c672320cd7113cbcbc253cd93bf158b8 (diff)
Add PointerList and EnvMap classes for working with, and propagating, argc/argv and env strings
Diffstat (limited to 'src/pointerlist.cc')
-rw-r--r--src/pointerlist.cc123
1 files changed, 123 insertions, 0 deletions
diff --git a/src/pointerlist.cc b/src/pointerlist.cc
new file mode 100644
index 0000000..c0242f7
--- /dev/null
+++ b/src/pointerlist.cc
@@ -0,0 +1,123 @@
+// -*- c++ -*-
+// Distributed under the BSD 2-Clause License.
+// See accompanying file LICENSE for details.
+#include "pointerlist.h"
+
+#include <cstring>
+
+PointerList::PointerList(int argc, const char* const argv[])
+{
+ for(int i = 0; i < argc; ++i)
+ {
+ push_back(argv[i]);
+ }
+}
+
+std::pair<int, const char* const*> PointerList::get()
+{
+ argptrs.clear();
+ for(const auto& arg : *this)
+ {
+ argptrs.push_back(arg.data());
+ }
+ argptrs.push_back(nullptr);
+
+ return {argptrs.size() - 1, // size not counting the nullptr at the end
+ argptrs.data()};
+}
+
+EnvMap::EnvMap(const char* const env[])
+{
+ if(env == nullptr)
+ {
+ return;
+ }
+
+ auto ptr = env;
+ while(*ptr)
+ {
+ insert(std::string_view(*ptr));
+ ++ptr;
+ }
+}
+
+EnvMap::EnvMap(const char* env)
+{
+ if(env == nullptr)
+ {
+ return;
+ }
+
+ auto ptr = env;
+ while(*ptr)
+ {
+ insert(ptr);
+ ptr += strlen(ptr) + 1;
+ }
+}
+
+std::string EnvMap::operator[](const std::string& key) const
+{
+ try
+ {
+ return data.at(key);
+ }
+ catch(...)
+ {
+ return {};
+ }
+}
+
+void EnvMap::clear()
+{
+ data.clear();
+}
+
+void EnvMap::insert(std::string_view key_value)
+{
+ auto equals_sign = key_value.find('=');
+ if(equals_sign == std::string::npos)
+ {
+ insert({key_value, ""});
+ return;
+ }
+ std::string key{key_value.substr(0, equals_sign)};
+ std::string value{key_value.substr(equals_sign + 1)}; // skip '='
+ insert({key, value});
+}
+
+void EnvMap::insert(const std::pair<std::string_view, std::string_view>& item)
+{
+ data[std::string(item.first)] = item.second;
+}
+
+bool EnvMap::contains(std::string_view key) const
+{
+ return data.contains(std::string{key});
+}
+
+std::size_t EnvMap::size() const
+{
+ return data.size();
+}
+
+std::string EnvMap::stringify() const
+{
+ std::string str;
+ for(const auto& [key, value] : data)
+ {
+ str += key + "=" + value + '\0';
+ }
+ str += '\0';
+ return str;
+}
+
+std::pair<int, const char* const*> EnvMap::get()
+{
+ pointerlist.clear();
+ for(const auto& [key, value] : data)
+ {
+ pointerlist.push_back(key + "=" + value + '\0');
+ }
+ return pointerlist.get();
+}