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// Read an INI file into easy-to-access name/value pairs.
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (C) 2009-2025, Ben Hoyt
// inih and INIReader are released under the New BSD license (see LICENSE.txt).
// Go to the project home page for more info:
//
// https://github.com/benhoyt/inih
#include <algorithm>
#include <cctype>
#include <cstdlib>
#include "../ini.h"
#include "INIReader.h"
using std::string;
INIReader::INIReader(const string& filename)
{
_error = ini_parse(filename.c_str(), ValueHandler, this);
}
INIReader::INIReader(const char *buffer, size_t buffer_size)
{
_error = ini_parse_string_length(buffer, buffer_size, ValueHandler, this);
}
int INIReader::ParseError() const
{
return _error;
}
string INIReader::ParseErrorMessage() const
{
// If _error is positive it means it is the line number on which a parse
// error occurred. This could be an overlong line, that ValueHandler
// indicated a user defined error, an unterminated section name, or a name
// without a value.
if (_error > 0) {
return "parse error on line " + std::to_string(_error) + "; missing ']' or '='?";
}
// If _error is negative it is a system type error, and 0 means success.
switch (_error) {
case -2:
return "unable to allocate memory";
case -1:
return "unable to open file";
case 0:
return "";
}
// This should never be reached. It probably means a new error code was
// added to the C API without updating this method.
return "unknown error " + std::to_string(_error);
}
string INIReader::Get(const string& section, const string& name, const string& default_value) const
{
string key = MakeKey(section, name);
// Use _values.find() here instead of _values.at() to support pre C++11 compilers
return _values.count(key) ? _values.find(key)->second : default_value;
}
string INIReader::GetString(const string& section, const string& name, const string& default_value) const
{
const string str = Get(section, name, "");
return str.empty() ? default_value : str;
}
long INIReader::GetInteger(const string& section, const string& name, long default_value) const
{
string valstr = Get(section, name, "");
const char* value = valstr.c_str();
char* end;
// This parses "1234" (decimal) and also "0x4D2" (hex)
long n = strtol(value, &end, 0);
return end > value ? n : default_value;
}
INI_API int64_t INIReader::GetInteger64(const string& section, const string& name, int64_t default_value) const
{
string valstr = Get(section, name, "");
const char* value = valstr.c_str();
char* end;
// This parses "1234" (decimal) and also "0x4D2" (hex)
int64_t n = strtoll(value, &end, 0);
return end > value ? n : default_value;
}
unsigned long INIReader::GetUnsigned(const string& section, const string& name, unsigned long default_value) const
{
string valstr = Get(section, name, "");
const char* value = valstr.c_str();
char* end;
// This parses "1234" (decimal) and also "0x4D2" (hex)
unsigned long n = strtoul(value, &end, 0);
return end > value ? n : default_value;
}
INI_API uint64_t INIReader::GetUnsigned64(const string& section, const string& name, uint64_t default_value) const
{
string valstr = Get(section, name, "");
const char* value = valstr.c_str();
char* end;
// This parses "1234" (decimal) and also "0x4D2" (hex)
uint64_t n = strtoull(value, &end, 0);
return end > value ? n : default_value;
}
double INIReader::GetReal(const string& section, const string& name, double default_value) const
{
string valstr = Get(section, name, "");
const char* value = valstr.c_str();
char* end;
double n = strtod(value, &end);
return end > value ? n : default_value;
}
bool INIReader::GetBoolean(const string& section, const string& name, bool default_value) const
{
string valstr = Get(section, name, "");
// Convert to lower case to make string comparisons case-insensitive
std::transform(valstr.begin(), valstr.end(), valstr.begin(),
[](const unsigned char& ch) { return static_cast<unsigned char>(::tolower(ch)); });
if (valstr == "true" || valstr == "yes" || valstr == "on" || valstr == "1")
return true;
else if (valstr == "false" || valstr == "no" || valstr == "off" || valstr == "0")
return false;
else
return default_value;
}
std::vector<string> INIReader::Sections() const
{
std::set<string> sectionSet;
for (std::map<string, string>::const_iterator it = _values.begin(); it != _values.end(); ++it) {
size_t pos = it->first.find('=');
if (pos != string::npos) {
sectionSet.insert(it->first.substr(0, pos));
}
}
return std::vector<string>(sectionSet.begin(), sectionSet.end());
}
std::vector<string> INIReader::Keys(const string& section) const
{
std::vector<string> keys;
string keyPrefix = MakeKey(section, "");
for (std::map<string, string>::const_iterator it = _values.begin(); it != _values.end(); ++it) {
if (it->first.compare(0, keyPrefix.length(), keyPrefix) == 0) {
keys.push_back(it->first.substr(keyPrefix.length()));
}
}
return keys;
}
bool INIReader::HasSection(const string& section) const
{
const string key = MakeKey(section, "");
std::map<string, string>::const_iterator pos = _values.lower_bound(key);
if (pos == _values.end())
return false;
// Does the key at the lower_bound pos start with "section"?
return pos->first.compare(0, key.length(), key) == 0;
}
bool INIReader::HasValue(const string& section, const string& name) const
{
string key = MakeKey(section, name);
return _values.count(key);
}
string INIReader::MakeKey(const string& section, const string& name)
{
string key = section + "=" + name;
// Convert to lower case to make section/name lookups case-insensitive
std::transform(key.begin(), key.end(), key.begin(),
[](const unsigned char& ch) { return static_cast<unsigned char>(::tolower(ch)); });
return key;
}
int INIReader::ValueHandler(void* user, const char* section, const char* name,
const char* value)
{
if (!name) // Happens when INI_CALL_HANDLER_ON_NEW_SECTION enabled
return 1;
INIReader* reader = static_cast<INIReader*>(user);
string key = MakeKey(section, name);
if (reader->_values[key].size() > 0)
reader->_values[key] += "\n";
reader->_values[key] += value ? value : "";
return 1;
}
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