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8f1dd00c36
We support both type of call - with or without mem pool. So ensure we will not use NULL vgname also when mem is given.
436 lines
8.6 KiB
C
436 lines
8.6 KiB
C
/*
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* Copyright (C) 2006-2012 Red Hat, Inc. All rights reserved.
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*
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* This file is part of the device-mapper userspace tools.
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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 "dmlib.h"
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#include <ctype.h>
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/*
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* consume characters while they match the predicate function.
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*/
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static char *_consume(char *buffer, int (*fn) (int))
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{
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while (*buffer && fn(*buffer))
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buffer++;
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return buffer;
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}
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static int _isword(int c)
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{
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return !isspace(c);
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}
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/*
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* Split buffer into NULL-separated words in argv.
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* Returns number of words.
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*/
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int dm_split_words(char *buffer, unsigned max,
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unsigned ignore_comments __attribute__((unused)),
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char **argv)
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{
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unsigned arg;
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for (arg = 0; arg < max; arg++) {
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buffer = _consume(buffer, isspace);
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if (!*buffer)
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break;
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argv[arg] = buffer;
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buffer = _consume(buffer, _isword);
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if (*buffer) {
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*buffer = '\0';
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buffer++;
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}
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}
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return arg;
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}
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/*
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* Remove hyphen quoting from a component of a name.
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* NULL-terminates the component and returns start of next component.
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*/
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static char *_unquote(char *component)
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{
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char *c = component;
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char *o = c;
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char *r;
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while (*c) {
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if (*(c + 1)) {
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if (*c == '-') {
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if (*(c + 1) == '-')
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c++;
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else
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break;
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}
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}
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*o = *c;
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o++;
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c++;
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}
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r = (*c) ? c + 1 : c;
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*o = '\0';
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return r;
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}
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int dm_split_lvm_name(struct dm_pool *mem, const char *dmname,
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char **vgname, char **lvname, char **layer)
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{
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if (mem)
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*vgname = dm_pool_strdup(mem, dmname);
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if (!*vgname)
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return 0;
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_unquote(*layer = _unquote(*lvname = _unquote(*vgname)));
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return 1;
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}
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/*
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* On error, up to glibc 2.0.6, snprintf returned -1 if buffer was too small;
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* From glibc 2.1 it returns number of chars (excl. trailing null) that would
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* have been written had there been room.
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*
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* dm_snprintf reverts to the old behaviour.
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*/
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int dm_snprintf(char *buf, size_t bufsize, const char *format, ...)
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{
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int n;
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va_list ap;
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va_start(ap, format);
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n = vsnprintf(buf, bufsize, format, ap);
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va_end(ap);
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if (n < 0 || ((unsigned) n + 1 > bufsize))
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return -1;
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return n;
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}
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const char *dm_basename(const char *path)
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{
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const char *p = strrchr(path, '/');
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return p ? p + 1 : path;
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}
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int dm_vasprintf(char **result, const char *format, va_list aq)
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{
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int i, n, size = 16;
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va_list ap;
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char *buf = dm_malloc(size);
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*result = 0;
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if (!buf)
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return -1;
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for (i = 0;; i++) {
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va_copy(ap, aq);
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n = vsnprintf(buf, size, format, ap);
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va_end(ap);
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if (0 <= n && n < size)
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break;
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dm_free(buf);
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/* Up to glibc 2.0.6 returns -1 */
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size = (n < 0) ? size * 2 : n + 1;
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if (!(buf = dm_malloc(size)))
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return -1;
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}
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if (i > 1) {
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/* Reallocating more then once? */
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if (!(*result = dm_strdup(buf))) {
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dm_free(buf);
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return -1;
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}
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dm_free(buf);
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} else
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*result = buf;
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return n + 1;
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}
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int dm_asprintf(char **result, const char *format, ...)
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{
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int r;
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va_list ap;
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va_start(ap, format);
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r = dm_vasprintf(result, format, ap);
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va_end(ap);
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return r;
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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.
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* count - number of occurrences of 'c' and 'c2'.
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*/
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static void _count_chars(const char *str, size_t *len, int *count,
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const int c1, const int c2)
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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 == c1 || *ptr == c2)
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(*count)++;
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}
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/*
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* Count occurrences 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 dm_count_chars(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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* Length of string after escaping double quotes and backslashes.
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*/
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size_t dm_escaped_len(const char *str)
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{
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size_t len = 1;
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int count = 0;
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_count_chars(str, &len, &count, '\"', '\\');
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return count + len;
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}
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/*
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* Copies a string, quoting orig_char with quote_char.
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* Optionally also quote quote_char.
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*/
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static void _quote_characters(char **out, const char *src,
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const int orig_char, const int quote_char,
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int quote_quote_char)
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{
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while (*src) {
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if (*src == orig_char ||
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(*src == quote_char && quote_quote_char))
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*(*out)++ = quote_char;
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*(*out)++ = *src++;
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}
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}
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static void _unquote_one_character(char *src, const char orig_char,
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const char quote_char)
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{
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char *out;
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char s, n;
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/* Optimise for the common case where no changes are needed. */
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while ((s = *src++)) {
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if (s == quote_char &&
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((n = *src) == orig_char || n == quote_char)) {
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out = src++;
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*(out - 1) = n;
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while ((s = *src++)) {
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if (s == quote_char &&
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((n = *src) == orig_char || n == quote_char)) {
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s = n;
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src++;
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}
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*out = s;
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out++;
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}
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*out = '\0';
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return;
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}
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}
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}
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/*
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* Unquote each character given in orig_char array and unquote quote_char
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* as well. Also save the first occurrence of each character from orig_char
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* that was found unquoted in arr_substr_first_unquoted array. This way we can
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* process several characters in one go.
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*/
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static void _unquote_characters(char *src, const char *orig_chars,
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size_t num_orig_chars,
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const char quote_char,
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char *arr_substr_first_unquoted[])
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{
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char *out = src;
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char c, s, n;
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unsigned i;
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while ((s = *src++)) {
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for (i = 0; i < num_orig_chars; i++) {
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c = orig_chars[i];
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if (s == quote_char &&
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((n = *src) == c || n == quote_char)) {
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s = n;
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src++;
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break;
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}
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if (arr_substr_first_unquoted && (s == c) &&
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!arr_substr_first_unquoted[i])
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arr_substr_first_unquoted[i] = out;
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};
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*out++ = s;
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}
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*out = '\0';
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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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_quote_characters(out, src, '-', '-', 0);
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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 *dm_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, '-', 0);
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_count_chars(lvname, &len, &hyphens, '-', 0);
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if (layer && *layer) {
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_count_chars(layer, &len, &hyphens, '-', 0);
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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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char *dm_build_dm_uuid(struct dm_pool *mem, const char *uuid_prefix, const char *lvid, const char *layer)
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{
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char *dmuuid;
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size_t len;
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if (!layer)
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layer = "";
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len = strlen(uuid_prefix) + strlen(lvid) + strlen(layer) + 2;
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if (!(dmuuid = dm_pool_alloc(mem, len))) {
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log_error("build_dm_name: Allocation failed for %" PRIsize_t
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" %s %s.", len, lvid, layer);
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return NULL;
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}
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sprintf(dmuuid, "%s%s%s%s", uuid_prefix, lvid, (*layer) ? "-" : "", layer);
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return dmuuid;
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}
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/*
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* Copies a string, quoting double quotes with backslashes.
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*/
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char *dm_escape_double_quotes(char *out, const char *src)
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{
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char *buf = out;
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_quote_characters(&buf, src, '\"', '\\', 1);
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*buf = '\0';
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return out;
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}
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/*
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* Undo quoting in situ.
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*/
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void dm_unescape_double_quotes(char *src)
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{
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_unquote_one_character(src, '\"', '\\');
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}
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/*
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* Unescape colons and "at" signs in situ and save the substrings
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* starting at the position of the first unescaped colon and the
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* first unescaped "at" sign. This is normally used to unescape
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* device names used as PVs.
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*/
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void dm_unescape_colons_and_at_signs(char *src,
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char **substr_first_unquoted_colon,
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char **substr_first_unquoted_at_sign)
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{
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const char *orig_chars = ":@";
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char *arr_substr_first_unquoted[] = {NULL, NULL, NULL};
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_unquote_characters(src, orig_chars, 2, '\\', arr_substr_first_unquoted);
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if (substr_first_unquoted_colon)
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*substr_first_unquoted_colon = arr_substr_first_unquoted[0];
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if (substr_first_unquoted_at_sign)
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*substr_first_unquoted_at_sign = arr_substr_first_unquoted[1];
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}
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int dm_strncpy(char *dest, const char *src, size_t n)
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{
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if (memccpy(dest, src, 0, n))
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return 1;
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if (n > 0)
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dest[n - 1] = '\0';
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return 0;
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}
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