83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
#ifndef lint
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static char rcsid[] = "@(#$Id: copyfile.cpp,v 1.4 2007-12-13 06:58:22 dockes Exp $ (C) 2005 J.F.Dockes";
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#endif
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <cstring>
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#include <string>
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using std::string;
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#include "debuglog.h"
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#define CPBSIZ 8192
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#define COPYFILE_NOERRUNLINK 1
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bool copyfile(const char *src, const char *dst, string &reason, int flags = 0)
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{
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int sfd = -1;
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int dfd = -1;
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bool ret = false;
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char buf[CPBSIZ];
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reason.erase();
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LOGDEB(("copyfile: %s to %s\n", src, dst));
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if ((sfd = open(src, O_RDONLY)) < 0) {
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reason += string("open ") + src + ": " + strerror(errno);
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goto out;
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}
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if ((dfd = open(dst, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
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reason += string("open/creat ") + dst + ": " + strerror(errno);
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// If we fail because of an open/truncate error, we do not want to unlink
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// the file, we might succeed...
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flags |= COPYFILE_NOERRUNLINK;
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goto out;
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}
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for (;;) {
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int didread;
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didread = read(sfd, buf, CPBSIZ);
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if (didread < 0) {
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reason += string("read src ") + src + ": " + strerror(errno);
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goto out;
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}
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if (didread == 0)
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break;
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if (write(dfd, buf, didread) != didread) {
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reason += string("write dst ") + src + ": " + strerror(errno);
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goto out;
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}
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}
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ret = true;
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out:
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if (ret == false && !(flags©FILE_NOERRUNLINK))
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unlink(dst);
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if (sfd >= 0)
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close(sfd);
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if (dfd >= 0)
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close(dfd);
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return ret;
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}
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