1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* 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;
}
|
