fix: Stop using ato* for string to num conversion

atoi, atof and so on have undefined behavior if anything goes wrong. We
now use strto*, but without error checking. In most places overflows and
the like *should* not happen. String to number conversions are only used
when reading data from other applications or from the config, if another
application gives unparsable strings or too large numbers, then most
likely there is something wrong with that application. If the error
comes from the user config, then the user has to live with values
provided by strto* on error (which are very reasonable)

Fixes #1201

src/components/bar.cpp

@@ -248,23 +248,23 @@ bar::bar(connection& conn, signal_emitter& emitter, const config& config, const
   auto offsetx = m_conf.get(m_conf.section(), "offset-x", ""s);
   auto offsety = m_conf.get(m_conf.section(), "offset-y", ""s);
 
-  m_opts.size.w = atoi(w.c_str());
-  m_opts.size.h = atoi(h.c_str());
-  m_opts.offset.x = atoi(offsetx.c_str());
-  m_opts.offset.y = atoi(offsety.c_str());
+  m_opts.size.w = std::strtol(w.c_str(), nullptr, 10);
+  m_opts.size.h = std::strtol(h.c_str(), nullptr, 10);
+  m_opts.offset.x = std::strtol(offsetx.c_str(), nullptr, 10);
+  m_opts.offset.y = std::strtol(offsety.c_str(), nullptr, 10);
 
   // Evaluate percentages
   double tmp;
-  if ((tmp = atof(w.c_str())) && w.find('%') != string::npos) {
+  if ((tmp = strtof(w.c_str(), nullptr)) && w.find('%') != string::npos) {
     m_opts.size.w = math_util::percentage_to_value<double>(tmp, m_opts.monitor->w);
   }
-  if ((tmp = atof(h.c_str())) && h.find('%') != string::npos) {
+  if ((tmp = strtof(h.c_str(), nullptr)) && h.find('%') != string::npos) {
     m_opts.size.h = math_util::percentage_to_value<double>(tmp, m_opts.monitor->h);
   }
-  if ((tmp = atof(offsetx.c_str())) != 0 && offsetx.find('%') != string::npos) {
+  if ((tmp = strtof(offsetx.c_str(), nullptr)) != 0 && offsetx.find('%') != string::npos) {
     m_opts.offset.x = math_util::percentage_to_value<double>(tmp, m_opts.monitor->w);
   }
-  if ((tmp = atof(offsety.c_str())) != 0 && offsety.find('%') != string::npos) {
+  if ((tmp = strtof(offsety.c_str(), nullptr)) != 0 && offsety.find('%') != string::npos) {
     m_opts.offset.y = math_util::percentage_to_value<double>(tmp, m_opts.monitor->h);
   }
 

src/components/builder.cpp

@@ -123,7 +123,7 @@ void builder::node(string str, bool add_space) {
       s.erase(0, 5);
 
     } else if ((n = s.find("%{T")) == 0 && (m = s.find('}')) != string::npos) {
-      font(atoi(s.substr(n + 3, m - 3).c_str()));
+      font(strtol(s.substr(n + 3, m - 3).c_str(), nullptr, 10));
       s.erase(n, m + 1);
 
     } else if ((n = s.find("%{U-}")) == 0) {

src/components/config.cpp

@@ -226,12 +226,12 @@ char config::convert(string&& value) const {
 
 template <>
 int config::convert(string&& value) const {
-  return std::atoi(value.c_str());
+  return std::strtol(value.c_str(), nullptr, 10);
 }
 
 template <>
 short config::convert(string&& value) const {
-  return static_cast<short>(std::atoi(value.c_str()));
+  return static_cast<short>(std::strtol(value.c_str(), nullptr, 10));
 }
 
 template <>

src/components/parser.cpp

@@ -106,7 +106,7 @@ void parser::codeblock(string&& data, const bar_settings& bar) {
         break;
 
       case 'O':
-        m_sig.emit(offset_pixel{static_cast<int>(std::atoi(value.c_str()))});
+        m_sig.emit(offset_pixel{static_cast<int>(std::strtol(value.c_str(), nullptr, 10))});
         break;
 
       case 'l':

src/components/renderer.cpp

@@ -153,7 +153,7 @@ renderer::renderer(
       string pattern{f};
       size_t pos = pattern.rfind(';');
       if (pos != string::npos) {
-        offset = std::atoi(pattern.substr(pos + 1).c_str());
+        offset = std::strtol(pattern.substr(pos + 1).c_str(), nullptr, 10);
         pattern.erase(pos);
       }
       auto font = cairo::make_font(*m_context, string{pattern}, offset, dpi_x, dpi_y);

src/ipc.cpp

@@ -69,7 +69,7 @@ int main(int argc, char** argv) {
       log(E_INVALID_CHANNEL, "No channel available for pid " + args[1]);
     }
 
-    pid = atoi(args[1].c_str());
+    pid = strtol(args[1].c_str(), nullptr, 10);
     args.erase(args.begin());
     args.erase(args.begin());
   }

src/modules/menu.cpp

@@ -76,7 +76,7 @@ namespace modules {
       auto spacing = m_formatter->get(get_format())->spacing;
       for (auto&& item : m_levels[m_level]->items) {
         /*
-         * Depending on whether the menu items are to the left or right of the toggle label, the items need to be 
+         * Depending on whether the menu items are to the left or right of the toggle label, the items need to be
          * drawn before or after the spacings and the separator
          *
          * If the menu expands to the left, the separator should be drawn on the right side because otherwise the menu
@@ -132,7 +132,7 @@ namespace modules {
       if (level.empty()) {
         level = "0";
       }
-      m_level = std::atoi(level.c_str());
+      m_level = std::strtol(level.c_str(), nullptr, 10);
       m_log.info("%s: Opening menu level '%i'", name(), static_cast<int>(m_level));
 
       if (static_cast<size_t>(m_level) >= m_levels.size()) {

src/modules/mpd.cpp

@@ -368,11 +368,11 @@ namespace modules {
         if (s.empty()) {
           return false;
         } else if (s[0] == '+') {
-          percentage = status->get_elapsed_percentage() + std::atoi(s.substr(1).c_str());
+          percentage = status->get_elapsed_percentage() + std::strtol(s.substr(1).c_str(), nullptr, 10);
         } else if (s[0] == '-') {
-          percentage = status->get_elapsed_percentage() - std::atoi(s.substr(1).c_str());
+          percentage = status->get_elapsed_percentage() - std::strtol(s.substr(1).c_str(), nullptr, 10);
         } else {
-          percentage = std::atoi(s.c_str());
+          percentage = std::strtol(s.c_str(), nullptr, 10);
         }
         mpd->seek(status->get_songid(), status->get_seek_position(percentage));
       } else {

src/modules/temperature.cpp

@@ -50,7 +50,7 @@ namespace modules {
   }
 
   bool temperature_module::update() {
-    m_temp = std::atoi(file_util::contents(m_path).c_str()) / 1000.0f + 0.5f;
+    m_temp = std::strtol(file_util::contents(m_path).c_str(), nullptr, 10) / 1000.0f + 0.5f;
     int m_temp_f = floor(((1.8 * m_temp) + 32) + 0.5);
     m_perc = math_util::cap(math_util::percentage(m_temp, 0, m_tempwarn), 0, 100);
 

src/x11/tray_manager.cpp

@@ -144,8 +144,8 @@ void tray_manager::setup(const bar_settings& bar_opts) {
   auto offset_x_def = conf.get(bs, "tray-offset-x", ""s);
   auto offset_y_def = conf.get(bs, "tray-offset-y", ""s);
 
-  auto offset_x = atoi(offset_x_def.c_str());
-  auto offset_y = atoi(offset_y_def.c_str());
+  auto offset_x = strtol(offset_x_def.c_str(), nullptr, 10);
+  auto offset_y = strtol(offset_y_def.c_str(), nullptr, 10);
 
   if (offset_x != 0 && offset_x_def.find('%') != string::npos) {
     if (m_opts.detached) {