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/*
* filediff.cc: Part of GNU CSSC.
*
* Copyright (C) 1998, Free Software Foundation, Inc.
*
* 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, USA.
*
* CSSC was originally Based on MySC, by Ross Ridge, which was
* placed in the Public Domain.
*
*
* Functions for diffing two files.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "cssc.h"
#include "filediff.h"
#ifdef CONFIG_SCCS_IDS
static const char rcs_id[] = "CSSC $Id: filediff.cc,v 1.7 2002/03/19 15:36:12 james_youngman Exp $";
#endif
FileDiff::FileDiff(const char *n1, const char *n2)
: fp_(0), name1(n1), name2(n2)
{
}
FileDiff::~FileDiff()
{
finish(fp_);
}
void
FileDiff::finish(FILE * &fp)
{
ASSERT(fp == fp_);
if (fp_)
pclose(fp_);
fp_ = 0;
fp = 0;
}
FILE*
FileDiff::start()
{
const mystring space(" ");
const mystring quote("'");
mystring cmd(mystring(CONFIG_DIFF_COMMAND) +
space + quote + name1 + quote +
space + quote + name2 + quote);
give_up_privileges();
fp_ = popen(cmd.c_str(), "r");
restore_privileges();
return fp_;
}
/* Local variables: */
/* mode: c++ */
/* End: */
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