129d0ac31e
Again, gcc-4.2.1 of OpenBSD-5.6 pointed out the use of strcat(). I took the chance to explain the reasons for the code a little bit.
144 lines
4.1 KiB
C++
144 lines
4.1 KiB
C++
// App.cc
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// Copyright (c) 2002 - 2006 Henrik Kinnunen (fluxgen at fluxbox dot org)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#include "App.hh"
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#include "FbString.hh"
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#include "Font.hh"
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#include "Image.hh"
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#include "EventManager.hh"
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#include <cstring>
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#include <cstdlib>
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#include <set>
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#include <iostream>
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namespace FbTk {
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App *App::s_app = 0;
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App *App::instance() {
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if (s_app == 0)
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throw std::string("You must create an instance of FbTk::App first!");
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return s_app;
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}
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App::App(const char *displayname):m_done(false), m_display(0) {
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if (s_app != 0)
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throw std::string("Can't create more than one instance of FbTk::App");
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s_app = this;
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// this allows the use of std::string.c_str(), which returns
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// a blank string, rather than a null string, so we make them equivalent
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if (displayname != 0 && displayname[0] == '\0')
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displayname = 0;
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m_display = XOpenDisplay(displayname);
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if (!m_display) {
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if (displayname) {
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throw std::string("Couldn't connect to XServer") + displayname;
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} else {
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throw std::string("Couldn't connect to XServer passing null display");
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}
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}
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FbStringUtil::init();
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}
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App::~App() {
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if (m_display != 0) {
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Font::shutdown();
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XCloseDisplay(m_display);
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m_display = 0;
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}
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s_app = 0;
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}
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void App::sync(bool discard) {
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XSync(display(), discard);
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}
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void App::eventLoop() {
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XEvent ev;
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while (!m_done) {
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XNextEvent(display(), &ev);
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EventManager::instance()->handleEvent(ev);
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}
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}
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void App::end() {
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m_done = true; //end loop in App::eventLoop
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}
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bool App::setenv(const char* key, const char* value) {
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if (!key || !*key)
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return false;
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static std::set<char*> stored;
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const size_t key_size = strlen(key);
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const size_t value_size = value ? strlen(value) : 0;
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const size_t newenv_size = key_size + value_size + 2;
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char* newenv = new char[newenv_size];
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if (!newenv) {
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return false;
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}
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// someone might have used putenv("key=value") (or setenv()) before.
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// if getenv("key") succeeds, the returning value points to the address
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// of "value" (right after the "="). this means, that that address
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// minus "key=" points to the beginning of what was set. if fluxbox
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// set that variable we have the pointer in "stored" and can dealloc it.
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//
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// we use putenv() to have control over the dealloction (valgrind and
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// other complaint about it)
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char* oldenv = getenv(key);
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if (oldenv) {
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oldenv = oldenv - (key_size + 1);
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}
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if (stored.find(oldenv) == stored.end()) {
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oldenv = NULL;
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}
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// create the new environment
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strncpy(newenv, key, key_size);
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newenv[key_size] = '=';
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if (value_size > 0) {
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strncpy(newenv+key_size+1, value, value_size);
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}
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newenv[newenv_size-1] = 0;
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if (putenv(newenv) == 0) {
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if (oldenv) {
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stored.erase(oldenv);
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delete[] oldenv;
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}
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stored.insert(newenv);
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}
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return true;
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}
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} // end namespace FbTk
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