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/* guestfish - the filesystem interactive shell
* Copyright (C) 2009 Red Hat 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <inttypes.h>
#include "fish.h"
static int parse_size (const char *str, off_t *size_rtn);
int
do_alloc (const char *cmd, int argc, char *argv[])
{
off_t size;
int fd;
if (argc != 2) {
fprintf (stderr, "use 'alloc file size' to create an image\n");
return -1;
}
if (parse_size (argv[1], &size) == -1)
return -1;
if (!guestfs_is_config (g)) {
fprintf (stderr, "can't allocate or add disks after launching\n");
return -1;
}
fd = open (argv[0], O_WRONLY|O_CREAT|O_NOCTTY|O_TRUNC, 0666);
if (fd == -1) {
perror (argv[0]);
return -1;
}
if (posix_fallocate (fd, 0, size) == -1) {
perror ("fallocate");
close (fd);
unlink (argv[0]);
return -1;
}
if (close (fd) == -1) {
perror (argv[0]);
unlink (argv[0]);
return -1;
}
if (guestfs_add_drive (g, argv[0]) == -1) {
unlink (argv[0]);
return -1;
}
return 0;
}
static int
parse_size (const char *str, off_t *size_rtn)
{
uint64_t size;
char type;
/* Note that the parsing here is looser than what is specified in the
* help, but we may tighten it up in future so beware.
*/
if (sscanf (str, "%"SCNu64"%c", &size, &type) == 2) {
switch (type) {
case 'k': case 'K': size *= 1024; break;
case 'm': case 'M': size *= 1024 * 1024; break;
case 'g': case 'G': size *= 1024 * 1024 * 1024; break;
case 's': size *= 512; break;
default:
fprintf (stderr, "could not parse size specification '%s'\n", str);
return -1;
}
}
else if (sscanf (str, "%"SCNu64, &size) == 1)
size *= 1024;
else {
fprintf (stderr, "could not parse size specification '%s'\n", str);
return -1;
}
/* XXX 32 bit file offsets, if anyone uses them? GCC should give
* a warning here anyhow.
*/
*size_rtn = size;
return 0;
}
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