mirror of
git://sourceware.org/git/lvm2.git
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158 lines
3.2 KiB
C
158 lines
3.2 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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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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* Count occurences of 'c' in 'str' until we reach a null char.
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*
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* Returns:
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* len - incremented for each char we encounter, whether 'c' or not.
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* count - number of occurrences of 'c'
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*/
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void count_chars(const char *str, size_t *len, int *count,
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const int c)
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{
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const char *ptr;
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for (ptr = str; *ptr; ptr++, (*len)++)
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if (*ptr == c)
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(*count)++;
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}
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/*
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* Count occurences of 'c' in 'str' of length 'size'.
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*
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* Returns:
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* Number of occurrences of 'c'
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*/
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unsigned count_chars_len(const char *str, size_t len, const int c)
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{
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size_t i;
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unsigned count = 0;
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for (i = 0; i < len; i++)
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if (str[i] == c)
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count++;
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return count;
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}
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/*
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* Copies a string, quoting hyphens with hyphens.
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*/
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static void _quote_hyphens(char **out, const char *src)
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{
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while (*src) {
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if (*src == '-')
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*(*out)++ = '-';
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*(*out)++ = *src++;
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}
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}
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/*
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* <vg>-<lv>-<layer> or if !layer just <vg>-<lv>.
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*/
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char *build_dm_name(struct dm_pool *mem, const char *vgname,
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const char *lvname, const char *layer)
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{
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size_t len = 1;
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int hyphens = 1;
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char *r, *out;
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count_chars(vgname, &len, &hyphens, '-');
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count_chars(lvname, &len, &hyphens, '-');
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if (layer && *layer) {
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count_chars(layer, &len, &hyphens, '-');
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hyphens++;
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}
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len += hyphens;
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if (!(r = dm_pool_alloc(mem, len))) {
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log_error("build_dm_name: Allocation failed for %" PRIsize_t
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" for %s %s %s.", len, vgname, lvname, layer);
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return NULL;
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}
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out = r;
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_quote_hyphens(&out, vgname);
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*out++ = '-';
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_quote_hyphens(&out, lvname);
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if (layer && *layer) {
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/* No hyphen if the layer begins with _ e.g. _mlog */
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if (*layer != '_')
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*out++ = '-';
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_quote_hyphens(&out, layer);
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}
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*out = '\0';
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return r;
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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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