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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <sys/wait.h>
#include <unistd.h>
#include "System/Platform/MessageBox.h"
#include "System/Platform/errorhandler.h"
namespace Platform {
/**
* @brief X message box function
*
* X clone of the Windows' MessageBox() function, using the commandline
* dialog creation tools zenity, kdialog or xmessage as a workhorse.
*
* If DESKTOP_SESSION is set to "gnome" or "kde", it attempts to use
* zenity (Gnome) or kdialog (KDE).
*
* If DESKTOP_SESSION is not set, or if executing zenity or kdialog failed,
* it attempts to use the generic (but ugly!) xmessage.
*
* As a last resort (if forking failed, none of the above mentioned programs
* could be found, or the used program returned an error) the message is
* written to stderr.
*/
void MsgBox(const char* message, const char* caption, unsigned int flags)
{
char cap[1024];
char msg[1024];
pid_t pid;
int status;
int len;
strncpy(cap, caption, sizeof(cap) - 2);
strncpy(msg, message, sizeof(msg) - 2);
cap[sizeof(cap) - 2] = 0;
msg[sizeof(msg) - 2] = 0;
/*
* xmessage interprets some strings beginning with '-' as command-line
* options. To avoid this, we make sure all strings we pass to it have
* newlines on the end. This is also useful for the fputs() case.
*
* kdialog and zenity always treat the argument after --error or --text
* as a non-option argument.
*/
if ((len = strlen(cap)) == 0 || cap[len - 1] != '\n')
strcat(cap, "\n");
if ((len = strlen(msg)) == 0 || msg[len - 1] != '\n')
strcat(msg, "\n");
// fork a child
switch (pid = fork()) {
case 0: {
// child process
const char* kde = getenv("KDE_FULL_SESSION");
const char* gnome = getenv("GNOME_DESKTOP_SESSION_ID");
const char* type = "--error";
if (gnome) {
if (flags & MBF_EXCL) {
// --warning shows 2 buttons, so it should only be used with a true _warning_
// ie. one which allows you to continue/cancel execution
//type = "--warning";
type = "--error";
}
else if (flags & MBF_CRASH) {
type = "--error";
}
else if (flags & MBF_INFO) {
type = "--info";
}
execlp("zenity", "zenity", "--title", cap, type, "--text", msg, (char*)nullptr);
}
if (kde && strstr(kde, "true")) {
if (flags & MBF_CRASH) {
type = "--error";
}
else if (flags & MBF_EXCL) {
type = "--sorry";
}
else if (flags & MBF_INFO) {
type = "--msgbox";
}
execlp("kdialog", "kdialog", "--title", cap, type, msg, (char*)nullptr);
}
execlp("xmessage", "xmessage", "-title", cap, "-buttons", "OK:0", "-default", "OK", "-center", msg, (char*)nullptr);
// if execution reaches here, it means execlp failed
_exit(EXIT_FAILURE);
} break;
default: {
// parent process
waitpid(pid, &status, 0);
const bool okButton = (!WIFEXITED(status) || (WEXITSTATUS(status) != 0));
if (!okButton)
break;
}
case -1: {
// fork error
if (flags & MBF_INFO) {
fputs("Info: ", stderr);
} else if (flags & MBF_EXCL) {
fputs("Warning: ", stderr);
} else {
fputs("Error: ", stderr);
}
fputs(cap, stderr);
fputs(" ", stderr);
fputs(msg, stderr);
} break;
}
}
} //namespace Platform
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