/* Copyright (C) 2009 Luke Shumaker
   
   This file is part of rvs.
   
   rvs 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, or (at your
   option) any later version.
   
   rvs 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 rvs; see the file COPYING.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef FILE_rvs.h_SEEN
#define FILE_rvs.h_SEEN

#include <stdio.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>

void *xmalloc (size_t size)
{
	void *value = malloc (size);
	if (value == NULL)
		error(EXIT_FAILURE,0,"virtual memory exhausted");
	return value;
}

void *xrealloc (void *ptr, size_t size)
{
	void *value = realloc (ptr, size);
	if (value == NULL)
		error(EXIT_FAILURE,0,"virtual memory exhausted");
	return value;
}

void xfree (void *ptr)
{
	free (ptr);
}

int xchdir (const char *filename)
{
	int ret=chdir(filename);
	if (ret != 0) {
		error(EXIT_FAILURE,errno,"%s/",filename);
	}
	return ret;
}

FILE *xfopen (const char *filename, const char *opentype)
{
	FILE *file = fopen(filename,opentype);
	/* fopen gives NULL on failure */
	if ( file == NULL ) {
		error(EXIT_FAILURE,errno,"%s",filename);
	}
	
	return file;
}

DIR *xopendir (const char *dirname)
{
	DIR *dir = opendir (dirname);
	if (dir == NULL) {
		error(EXIT_FAILURE,errno,"%s/",dirname);
	}
	
	return dir;
}

void stradds(size_t *size, char **dest, char *str)
{
	if (*size > ( strlen(*dest) + strlen(str) )) {
		strcat(*dest, str);
	} else {
		*size = strlen(*dest) + strlen(str) + 1;
		
		*dest = (char *) xrealloc (*dest, *size);
		strcat(*dest, str);
	}
}

#endif