56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
#include <stdexcept>
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#include <sstream>
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#include "util.h"
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static std::string trim(const std::string &s)
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{
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auto isspace = [] (char c) -> bool { return c == ' ' || c == '\t' || c == '\r' || c == '\n'; };
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size_t front = 0;
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while (isspace(s[front]))
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++front;
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size_t back = s.size() - 1;
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while (back > front && isspace(s[back]))
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--back;
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return s.substr(front, back - front + 1);
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}
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std::string read_setting(const std::string &name, std::istream &is)
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{
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char linebuf[512];
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while (is.good()) {
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is.getline(linebuf, sizeof(linebuf));
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for (char *p = linebuf; *p; p++) {
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if(*p != '#')
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continue;
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*p = '\0'; // Cut off at the first #
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break;
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}
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std::string line(linebuf);
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auto pos = line.find('=');
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if (pos == std::string::npos)
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continue;
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auto key = trim(line.substr(0, pos));
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if (key != name)
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continue;
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return trim(line.substr(pos+1));
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}
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std::ostringstream oss;
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oss << "Setting '" << name << "' not found";
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throw std::runtime_error(oss.str());
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}
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std::string read_setting_default(const std::string &name, std::istream &is,
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const std::string &def)
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{
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try {
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return read_setting(name, is);
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} catch(const std::runtime_error &e) {
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return def;
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}
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}
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