mirror of
git://sourceware.org/git/lvm2.git
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162 lines
2.9 KiB
C
162 lines
2.9 KiB
C
/*
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* Copyright (C) 2006 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 General Public License v.2.
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*
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* You should have received a copy of the GNU 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 "libdevmapper.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, unsigned ignore_comments,
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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 (!(*vgname = dm_pool_strdup(mem, dmname)))
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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 || (n > bufsize - 1))
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return -1;
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return n;
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}
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char *dm_basename(const char *path)
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{
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char *p = strrchr(path, '/');
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return p ? p + 1 : (char *) path;
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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 n, ok = 0, size = 32;
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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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while (!ok) {
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va_start(ap, format);
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n = vsnprintf(buf, size, format, ap);
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if (0 <= n && n < size)
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ok = 1;
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else {
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dm_free(buf);
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size *= 2;
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buf = dm_malloc(size);
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if (!buf)
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return -1;
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};
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va_end(ap);
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}
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*result = dm_strdup(buf);
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dm_free(buf);
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return n + 1;
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}
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