/*
 *  $Id: xcprint.c,v 1.1 2002/10/15 08:39:01 clip Exp $
 * 
 *  xcprint.c - functions to print help, version, errors, etc
 *  Copyright (C) 2001 Kim Saunders
 *
 *  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 <stdarg.h>
#include <string.h>
#include "xcdef.h"
#include "xclib.h"
#include "xcprint.h"

/* print the help screen. argument is argv[0] from main() */
void prhelp (char *name)
{
	fprintf(
		stderr,
		"Usage: %s [OPTION] [FILE]...\n"\
		"Access an X server selection for reading or writing.\n"\
		"\n"\
		"  -i, -in          in mode\n"\
		"  -o, -out         out mode\n"\
		"  -l, -loops       number of selection requests to "\
		"wait for before exiting\n"\
		"  -d, -display     X display to connect to (eg "\
		"localhost:0\")\n"\
		"  -h, -help        usage information\n"\
		"      -selection   selection to access (\"primary\", "\
		"\"secondary\" or \"clipboard\")\n"\
		"      -version     version information\n"\
		"      -silent      errors only, run in background (default)\n"\
		"      -quiet       run in foreground, show what's happening\n"\
		"      -verbose     running commentary\n"\
		"\n"\
		"Report bugs to <kims@debian.org>\n",
		name
	);
	exit(EXIT_SUCCESS);
}


/* A function to print the software version info */
void prversion (void)
{
	fprintf(stderr, "%s version %1.2f\n", XC_NAME, XC_VERS);
	fprintf(stderr, "Copyright (C) 2001 Kim Saunders\n");
	fprintf(stderr, "Distributed under the terms of the GNU GPL\n");
	exit(EXIT_SUCCESS);
}

/* failure message for malloc() problems */
void errmalloc (void)
{
	fprintf(stderr, "Error: Could not allocate memory.\n");
	exit(EXIT_FAILURE);
}

/* failure to connect to X11 display */
void errxdisplay (char *display)
{
	/* if the display wasn't specified, read it from the enviroment
	 * just like XOpenDisplay would
	 */
	if (display == NULL)
		display = getenv("DISPLAY");
	
	fprintf(stderr, "Error: Can't open display: %s\n", display);
	exit(EXIT_FAILURE);
}

/* a wrapper for perror that joins multiple prefixes together. Arguments
 * are an integer, and any number of strings. The integer needs to be set to
 * the number of strings that follow.
 */
void errperror(int prf_tot, ...)
{
	va_list ap;		/* argument pointer */
	char *msg_all;		/* all messages so far */
	char *msg_cur;		/* current message string */
	int prf_cur;		/* current prefix number */
	
	/* start off with an empty string */
	msg_all = xcstrdup("");

	/* start looping through the viariable arguments */
	va_start(ap, prf_tot);

	/* loop through each of the arguments */
	for (prf_cur = 0; prf_cur < prf_tot; prf_cur++)
	{
		/* get the current argument */
		msg_cur = va_arg(ap, char *);
		
		/* realloc msg_all so it's big enough for itself, the current
		 * argument, and a null terminator
		 */
		msg_all = (char *)xcrealloc(
			msg_all,
			strlen(msg_all) + strlen(msg_cur) + sizeof(char)
		);

		/* append the current message the the total message */
		strcat(msg_all, msg_cur);
	}
	va_end(ap);

	perror(msg_all);

	/* free the complete string */
	free(msg_all);
}
