mirror of
git://sourceware.org/git/lvm2.git
synced 2024-10-28 11:55:55 +03:00
158 lines
3.2 KiB
C
158 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
|
|
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This file is part of LVM2.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU Lesser General Public License v.2.1.
|
|
*
|
|
* You should have received a copy of the GNU Lesser 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 "lib.h"
|
|
#include "lvm-string.h"
|
|
|
|
#include <ctype.h>
|
|
|
|
int emit_to_buffer(char **buffer, size_t *size, const char *fmt, ...)
|
|
{
|
|
int n;
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
n = vsnprintf(*buffer, *size, fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (n < 0 || ((size_t)n == *size))
|
|
return 0;
|
|
|
|
*buffer += n;
|
|
*size -= n;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Count occurences of 'c' in 'str' until we reach a null char.
|
|
*
|
|
* Returns:
|
|
* len - incremented for each char we encounter, whether 'c' or not.
|
|
* count - number of occurrences of 'c'
|
|
*/
|
|
void count_chars(const char *str, size_t *len, int *count,
|
|
const int c)
|
|
{
|
|
const char *ptr;
|
|
|
|
for (ptr = str; *ptr; ptr++, (*len)++)
|
|
if (*ptr == c)
|
|
(*count)++;
|
|
}
|
|
|
|
/*
|
|
* Count occurences of 'c' in 'str' of length 'size'.
|
|
*
|
|
* Returns:
|
|
* Number of occurrences of 'c'
|
|
*/
|
|
unsigned count_chars_len(const char *str, size_t len, const int c)
|
|
{
|
|
size_t i;
|
|
unsigned count = 0;
|
|
|
|
for (i = 0; i < len; i++)
|
|
if (str[i] == c)
|
|
count++;
|
|
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* Copies a string, quoting hyphens with hyphens.
|
|
*/
|
|
static void _quote_hyphens(char **out, const char *src)
|
|
{
|
|
while (*src) {
|
|
if (*src == '-')
|
|
*(*out)++ = '-';
|
|
|
|
*(*out)++ = *src++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* <vg>-<lv>-<layer> or if !layer just <vg>-<lv>.
|
|
*/
|
|
char *build_dm_name(struct dm_pool *mem, const char *vgname,
|
|
const char *lvname, const char *layer)
|
|
{
|
|
size_t len = 1;
|
|
int hyphens = 1;
|
|
char *r, *out;
|
|
|
|
count_chars(vgname, &len, &hyphens, '-');
|
|
count_chars(lvname, &len, &hyphens, '-');
|
|
|
|
if (layer && *layer) {
|
|
count_chars(layer, &len, &hyphens, '-');
|
|
hyphens++;
|
|
}
|
|
|
|
len += hyphens;
|
|
|
|
if (!(r = dm_pool_alloc(mem, len))) {
|
|
log_error("build_dm_name: Allocation failed for %" PRIsize_t
|
|
" for %s %s %s.", len, vgname, lvname, layer);
|
|
return NULL;
|
|
}
|
|
|
|
out = r;
|
|
_quote_hyphens(&out, vgname);
|
|
*out++ = '-';
|
|
_quote_hyphens(&out, lvname);
|
|
|
|
if (layer && *layer) {
|
|
/* No hyphen if the layer begins with _ e.g. _mlog */
|
|
if (*layer != '_')
|
|
*out++ = '-';
|
|
_quote_hyphens(&out, layer);
|
|
}
|
|
*out = '\0';
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Device layer names are all of the form <vg>-<lv>-<layer>, any
|
|
* other hyphens that appear in these names are quoted with yet
|
|
* another hyphen. The top layer of any device has no layer
|
|
* name. eg, vg0-lvol0.
|
|
*/
|
|
int validate_name(const char *n)
|
|
{
|
|
register char c;
|
|
register int len = 0;
|
|
|
|
if (!n || !*n)
|
|
return 0;
|
|
|
|
/* Hyphen used as VG-LV separator - ambiguity if LV starts with it */
|
|
if (*n == '-')
|
|
return 0;
|
|
|
|
if (!strcmp(n, ".") || !strcmp(n, ".."))
|
|
return 0;
|
|
|
|
while ((len++, c = *n++))
|
|
if (!isalnum(c) && c != '.' && c != '_' && c != '-' && c != '+')
|
|
return 0;
|
|
|
|
if (len > NAME_LEN)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|