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authorJörg Frings-Fürst <debian@jff-webhosting.net>2017-04-29 12:11:35 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2017-04-29 12:11:35 +0200
commitdcef13a23c06398c0c9b3145c08b28d1110bc169 (patch)
treedf8d3227b3d71fdd356b3c1e69c62533d1759f72 /app/wlib/gtklib/osxhelp.c
parent3e11d9c0e6173fce8a482efed8d7f965e8bd6dfa (diff)
parent16e9630b79f0a7a90c6cedb6781175bb8b337dc1 (diff)
Merge tag 'upstream/4.3.0'
Upstream version 4.3.0
Diffstat (limited to 'app/wlib/gtklib/osxhelp.c')
-rw-r--r--app/wlib/gtklib/osxhelp.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/app/wlib/gtklib/osxhelp.c b/app/wlib/gtklib/osxhelp.c
new file mode 100644
index 0000000..829ec94
--- /dev/null
+++ b/app/wlib/gtklib/osxhelp.c
@@ -0,0 +1,133 @@
+/** \file osxhelp.c
+ * use OSX Help system
+ */
+
+/* XTrkCad - Model Railroad CAD
+ * Copyright (C) 2015 Martin Fischer
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include "gtkint.h"
+#include "i18n.h"
+
+#define HELPCOMMANDPIPE "/tmp/helppipe"
+#define EXITCOMMAND "##exit##"
+#define HELPERPROGRAM "helphelper"
+
+static pid_t pidOfChild;
+static int handleOfPipe;
+extern char *wExecutableName;
+
+/**
+ * Create the fully qualified filename for the help helper
+ *
+ * \param parent IN path and filename of parent process
+ * \return filename for the child process
+ */
+
+static
+char *ChildProgramFile(char *parentProgram)
+{
+ char *startOfFilename;
+ char *childProgram;
+
+ childProgram = malloc(strlen(parentProgram)+ sizeof(HELPERPROGRAM) + 1);
+ strcpy(childProgram, parentProgram);
+ startOfFilename = strrchr(childProgram, '/');
+ strcpy(startOfFilename + 1, HELPERPROGRAM);
+
+ return (childProgram);
+}
+
+
+/**
+ * Invoke the help system to display help for <topic>.
+ *
+ * \param topic IN topic string
+ */
+
+void wHelp(const char * topic)
+{
+ pid_t newPid;
+ int len;
+ int status;
+ const char html[] = ".html";
+ char *page;
+
+ // check whether child already exists
+ if (pidOfChild != 0) {
+ if (waitpid(pidOfChild, &status, WNOHANG) > 0) {
+ // child exited -> clean up
+ close(handleOfPipe);
+ unlink(HELPCOMMANDPIPE);
+ handleOfPipe = 0;
+ pidOfChild = 0; // child exited
+ }
+ }
+
+ // (re)start child
+ if (pidOfChild == 0) {
+ mkfifo(HELPCOMMANDPIPE, 0666);
+ newPid = fork(); /* New process starts here */
+
+ if (newPid > 0) {
+ pidOfChild = newPid;
+ } else if (newPid == 0) {
+ char *child = ChildProgramFile(wExecutableName);
+
+ if (execlp(child, child, NULL) < 0) { /* never normally returns */
+ exit(8);
+ }
+
+ free(child);
+ } else { /* -1 signifies fork failure */
+ pidOfChild = 0;
+ return;
+ }
+ }
+
+ if (!handleOfPipe) {
+ handleOfPipe = open(HELPCOMMANDPIPE, O_WRONLY);
+
+ if (handleOfPipe < 0) {
+ kill(pidOfChild, SIGKILL); /* tidy up on next call */
+ }
+
+ }
+
+ page = malloc(strlen(topic) + strlen(html) + 1);
+
+ if (!page) {
+ return;
+ }
+
+ strcpy(page, topic);
+ strcat(page, html);
+ len = strlen(page);
+
+ write(handleOfPipe, &len, sizeof(int));
+ write(handleOfPipe, page, strlen(page)+1);
+
+ free(page);
+}