add command line option to change the pid path

This adds a -P or --pid-path option to the command line which
allows the user to change the path and the name of the pid file created
when espeakup is running as a daemon.

I would like to thank Chris Brannon for the original idea for this.

cli.c

@@ -24,12 +24,16 @@
 
 #include "espeakup.h"
 
+/* pid path */
+extern char *pidPath;
+
 /* default voice */
 extern char *defaultVoice;
 
 /* command line options */
-const char *shortOptions = "dhV:v";
+const char *shortOptions = "P:V:dhv";
 const struct option longOptions[] = {
+	{"pid-path", required_argument, NULL, 'P'},
 	{"default-voice", required_argument, NULL, 'V'},
 	{"debug", no_argument, NULL, 'd'},
 	{"help", no_argument, NULL, 'h'},
@@ -61,10 +65,16 @@ static void show_version(void)
 void process_cli(int argc, char **argv)
 {
 	int opt;
+	char *cp;
 
 	do {
 		opt = getopt_long(argc, argv, shortOptions, longOptions, NULL);
 		switch (opt) {
+		case 'p':
+			cp = strdup(optarg);
+			if (cp != NULL)
+				pidPath = cp;
+			break;
 		case 'V':
 			defaultVoice = strdup(optarg);
 			break;

espeakup.8

@@ -9,6 +9,9 @@ espeakup \(em connect Speakup to the ESpeak TTS engine
 .SH SYNOPSIS
 .B espeakup
 [
+.B \-\^\-pid-path=path
+]
+[
 .B \-\^\-default-voice=voicename
 ]
 [
@@ -22,6 +25,9 @@ espeakup \(em connect Speakup to the ESpeak TTS engine
 ]
 .SH OPTIONS
 .TP
+.B \-P path, \-\^\-pid-path=path
+Set the full path for the pid file espeakup uses when in daemon mode.
+.TP
 .B \-V voicename, \-\^\-default-voice=voicename
 Set the espeak voice to be used by default.
 .TP

espeakup.c

@@ -27,7 +27,7 @@
 #include "espeakup.h"
 
 /* path to our pid file */
-const char *pidPath = "/var/run/espeakup.pid";
+char *pidPath = "/var/run/espeakup.pid";
 
 int debug = 0;
 struct queue_t *synth_queue = NULL;