mirror of
git://sourceware.org/git/lvm2.git
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153 lines
3.1 KiB
C
153 lines
3.1 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "lvm-string.h"
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#include <ctype.h>
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int emit_to_buffer(char **buffer, size_t *size, const char *fmt, ...)
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{
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int n;
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va_list ap;
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va_start(ap, fmt);
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n = vsnprintf(*buffer, *size, fmt, ap);
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va_end(ap);
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/*
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* Revert to old glibc behaviour (version <= 2.0.6) where snprintf
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* returned -1 if buffer was too small. From glibc 2.1 it returns number
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* of chars that would have been written had there been room.
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*/
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if (n < 0 || ((unsigned) n + 1 > *size))
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n = -1;
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if (n < 0 || ((size_t)n == *size))
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return 0;
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*buffer += n;
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*size -= n;
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return 1;
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}
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/*
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* A-Za-z0-9._-+/=!:&#
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*/
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int validate_tag(const char *n)
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{
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register char c;
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register int len = 0;
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if (!n || !*n)
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return 0;
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while ((len++, c = *n++))
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if (!isalnum(c) && c != '.' && c != '_' && c != '-' && c != '+' && c != '/'
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&& c != '=' && c != '!' && c != ':' && c != '&' && c != '#')
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return 0;
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return 1;
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}
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/*
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* Device layer names are all of the form <vg>-<lv>-<layer>, any
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* other hyphens that appear in these names are quoted with yet
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* another hyphen. The top layer of any device has no layer
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* name. eg, vg0-lvol0.
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*/
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int validate_name(const char *n)
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{
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register char c;
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register int len = 0;
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if (!n || !*n)
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return 0;
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/* Hyphen used as VG-LV separator - ambiguity if LV starts with it */
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if (*n == '-')
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return 0;
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if (!strcmp(n, ".") || !strcmp(n, ".."))
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return 0;
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while ((len++, c = *n++))
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if (!isalnum(c) && c != '.' && c != '_' && c != '-' && c != '+')
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return 0;
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if (len > NAME_LEN)
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return 0;
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return 1;
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}
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int apply_lvname_restrictions(const char *name)
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{
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const char *reserved_prefixes[] = {
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"snapshot",
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"pvmove",
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NULL
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};
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const char *reserved_strings[] = {
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"_mlog",
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"_mimage",
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"_rimage",
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"_rmeta",
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"_vorigin",
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"_tdata",
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"_tmeta",
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NULL
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};
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unsigned i;
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const char *s;
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for (i = 0; (s = reserved_prefixes[i]); i++) {
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if (!strncmp(name, s, strlen(s))) {
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log_error("Names starting \"%s\" are reserved. "
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"Please choose a different LV name.", s);
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return 0;
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}
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}
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for (i = 0; (s = reserved_strings[i]); i++) {
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if (strstr(name, s)) {
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log_error("Names including \"%s\" are reserved. "
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"Please choose a different LV name.", s);
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return 0;
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}
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}
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return 1;
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}
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int is_reserved_lvname(const char *name)
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{
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int rc, old_suppress;
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old_suppress = log_suppress(2);
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rc = !apply_lvname_restrictions(name);
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log_suppress(old_suppress);
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return rc;
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}
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char *build_dm_uuid(struct dm_pool *mem, const char *lvid,
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const char *layer)
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{
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return dm_build_dm_uuid(mem, UUID_PREFIX, lvid, layer);
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}
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