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// -*-c++-*-
/* $Id: str2file.C,v 1.8 1999/11/26 07:53:18 dm Exp $ */
/*
*
* Copyright (C) 1998 David Mazieres (dm@uun.org)
*
* 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, 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 "amisc.h"
bool
str2file (str file, str s, int perm, bool excl)
{
if (!file.len () || file.len () < strlen (file)) {
errno = EINVAL;
return false;
}
if (file[file.len () - 1] == '/') {
errno = EISDIR;
return false;
}
str tmpfile = file << "~";
unlink (tmpfile);
int fd = open (tmpfile, O_CREAT|O_EXCL|O_WRONLY, perm);
if (fd < 0)
return false;
if (write (fd, s.cstr (), s.len ()) != int (s.len ()) || fsync (fd) < 0) {
close (fd);
unlink (tmpfile);
return false;
}
if (s.len () && s[s.len () - 1] != '\n')
write (fd, "\n", 1);
if (close (fd) < 0 || (excl && link (tmpfile, file) < 0)
|| (!excl && rename (tmpfile, file) < 0)) {
unlink (tmpfile);
return false;
}
if (excl)
unlink (tmpfile);
return true;
}
str
file2str (str file)
{
int fd = open (file, O_RDONLY, 0);
if (fd < 0)
return NULL;
struct stat sb;
if (fstat (fd, &sb) < 0) {
close (fd);
return NULL;
}
if (!S_ISREG (sb.st_mode)) {
warn << file << ": not a regular file\n";
close (fd);
errno = EINVAL;
return NULL;
}
mstr m (sb.st_size);
errno = EAGAIN;
ssize_t n = read (fd, m, sb.st_size);
int saved_errno = errno;
close (fd);
errno = saved_errno;
if (n < 0)
return NULL;
m.setlen (n);
return m;
}
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