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/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 2011, 2013, 2017-2018 Free Software Foundation, Inc.
GDBM 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 3, or (at your option)
any later version.
GDBM 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 GDBM. If not, see <http://www.gnu.org/licenses/>. */
#include "autoconf.h"
#include "gdbmdefs.h"
/* Read exactly SIZE bytes of data into BUFFER. Return value is 0 on
success, and -1 on error. In the latter case, gdbm_errno is set to
GDBM_FILE_EOF, if not enough data is available, and to
GDBM_FILE_READ_ERROR, if a read error occurs. */
int
_gdbm_full_read (GDBM_FILE dbf, void *buffer, size_t size)
{
char *ptr = buffer;
while (size)
{
ssize_t rdbytes = gdbm_file_read (dbf, ptr, size);
if (rdbytes == -1)
{
if (errno == EINTR)
continue;
if (gdbm_last_errno (dbf) == GDBM_NO_ERROR)
GDBM_SET_ERRNO (dbf, GDBM_FILE_READ_ERROR, FALSE);
return -1;
}
if (rdbytes == 0)
{
GDBM_SET_ERRNO (dbf, GDBM_FILE_EOF, FALSE);
return -1;
}
ptr += rdbytes;
size -= rdbytes;
}
return 0;
}
/* Write exactly SIZE bytes of data from BUFFER tp DBF. Return 0 on
success, and -1 (setting gdbm_errno to GDBM_FILE_READ_ERROR) on error. */
int
_gdbm_full_write (GDBM_FILE dbf, void *buffer, size_t size)
{
char *ptr = buffer;
while (size)
{
ssize_t wrbytes = gdbm_file_write (dbf, ptr, size);
if (wrbytes == -1)
{
if (errno == EINTR)
continue;
if (gdbm_last_errno (dbf) == GDBM_NO_ERROR)
GDBM_SET_ERRNO (dbf, GDBM_FILE_WRITE_ERROR, TRUE);
return -1;
}
if (wrbytes == 0)
{
errno = ENOSPC;
GDBM_SET_ERRNO (dbf, GDBM_FILE_WRITE_ERROR, TRUE);
return -1;
}
ptr += wrbytes;
size -= wrbytes;
}
return 0;
}
/* Grow the disk file of DBF to SIZE bytes in length. Fill the
newly allocated space with zeros. */
int
_gdbm_file_extend (GDBM_FILE dbf, off_t size)
{
size_t page_size = sysconf (_SC_PAGESIZE);
char *buf;
off_t file_end;
file_end = lseek (dbf->desc, 0, SEEK_END);
if (!file_end)
{
GDBM_SET_ERRNO (dbf, GDBM_FILE_SEEK_ERROR, FALSE);
return -1;
}
size -= file_end;
if (size > 0)
{
if (size < page_size)
page_size = size;
buf = calloc (1, page_size);
if (!buf)
{
GDBM_SET_ERRNO (dbf, GDBM_MALLOC_ERROR, FALSE);
return -1;
}
while (size)
{
ssize_t n = write (dbf->desc, buf,
size < page_size ? size : page_size);
if (n <= 0)
{
GDBM_SET_ERRNO (dbf, GDBM_FILE_WRITE_ERROR, TRUE);
break;
}
size -= n;
}
free (buf);
if (size)
return -1;
}
return 0;
}
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