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/**
* @file X_MessageBox.cpp
* @brief X_MessageBox function
* @author Tobi Vollebregt
*
* Defines the X_MessageBox() function.
*
* Copyright (C) 2006. Licensed under the terms of the
* GNU GPL, v2 or later
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include "Platform/errorhandler.h"
/**
* @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 X_MessageBox(const char *msg, const char *caption, unsigned int flags)
{
char caption2[100];
char msg2[1000];
pid_t pid;
int status, len;
strncpy(caption2, caption, sizeof(caption2) - 2);
strncpy(msg2, msg, sizeof(msg2) - 2);
caption2[sizeof(caption2) - 2] = 0;
msg2[sizeof(msg2) - 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.
*/
len = strlen(caption2);
if (len == 0 || caption2[len - 1] != '\n')
strcat(caption2, "\n");
len = strlen(msg2);
if (len == 0 || msg2[len - 1] != '\n')
strcat(msg2, "\n");
/* fork a child */
pid = fork();
switch (pid) {
case 0: /* child process */
{
const char* session = getenv("DESKTOP_SESSION");
const char* type = "--error";
if (session && !strcasecmp(session, "gnome")) {
// --warning shows 2 buttons, so it should only be used with a true _warning_
// ie. one which allows you to continue/cancel execution
// if (flags & MBF_EXCL) type = "--warning";
if (flags & MBF_INFO) type = "--info";
execlp("zenity", "zenity", "--title", caption2, type, "--text", msg2, (char*)NULL);
}
if (session && (strstr(session, "kde") || strstr(session, "KDE"))) {
if (flags & MBF_EXCL) type = "--sorry";
if (flags & MBF_INFO) type = "--msgbox";
execlp("kdialog", "kdialog", "--title", caption2, type, msg2, (char*)NULL);
}
execlp("xmessage", "xmessage", "-title", caption2, "-buttons", "OK:0", "-default", "OK", "-center", msg2, (char*)NULL);
/* if execution reaches here, it means execlp failed */
_exit(EXIT_FAILURE);
break;
}
default: /* parent process */
{
waitpid(pid, &status, 0);
if ((!WIFEXITED(status)) || (WEXITSTATUS(status) != 0)) /* ok button */
{
case -1: /* fork error */
/* I kept this basically the same as the original
console-only error reporting. */
if (flags & MBF_INFO)
fputs("Info: ", stderr);
else if (flags & MBF_EXCL)
fputs("Warning: ", stderr);
else
fputs("Error: ", stderr);
fputs(caption2, stderr);
fputs(" ", stderr);
fputs(msg2, stderr);
}
break;
}
}
}
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