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/*
* Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
*
* This file is part of the device-mapper userspace tools.
*
* 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 "dmlib.h"
#include "libdevmapper.h"
#include <ctype.h>
/*
* consume characters while they match the predicate function.
*/
static char *_consume(char *buffer, int (*fn) (int))
{
while (*buffer && fn(*buffer))
buffer++;
return buffer;
}
static int _isword(int c)
{
return !isspace(c);
}
/*
* Split buffer into NULL-separated words in argv.
* Returns number of words.
*/
int dm_split_words(char *buffer, unsigned max,
unsigned ignore_comments __attribute__((unused)),
char **argv)
{
unsigned arg;
for (arg = 0; arg < max; arg++) {
buffer = _consume(buffer, isspace);
if (!*buffer)
break;
argv[arg] = buffer;
buffer = _consume(buffer, _isword);
if (*buffer) {
*buffer = '\0';
buffer++;
}
}
return arg;
}
/*
* Remove hyphen quoting from a component of a name.
* NULL-terminates the component and returns start of next component.
*/
static char *_unquote(char *component)
{
char *c = component;
char *o = c;
char *r;
while (*c) {
if (*(c + 1)) {
if (*c == '-') {
if (*(c + 1) == '-')
c++;
else
break;
}
}
*o = *c;
o++;
c++;
}
r = (*c) ? c + 1 : c;
*o = '\0';
return r;
}
int dm_split_lvm_name(struct dm_pool *mem, const char *dmname,
char **vgname, char **lvname, char **layer)
{
if (mem && !(*vgname = dm_pool_strdup(mem, dmname)))
return 0;
_unquote(*layer = _unquote(*lvname = _unquote(*vgname)));
return 1;
}
/*
* On error, up to glibc 2.0.6, snprintf returned -1 if buffer was too small;
* From glibc 2.1 it returns number of chars (excl. trailing null) that would
* have been written had there been room.
*
* dm_snprintf reverts to the old behaviour.
*/
int dm_snprintf(char *buf, size_t bufsize, const char *format, ...)
{
int n;
va_list ap;
va_start(ap, format);
n = vsnprintf(buf, bufsize, format, ap);
va_end(ap);
if (n < 0 || ((unsigned) n + 1 > bufsize))
return -1;
return n;
}
const char *dm_basename(const char *path)
{
const char *p = strrchr(path, '/');
return p ? p + 1 : path;
}
int dm_asprintf(char **result, const char *format, ...)
{
int n, ok = 0, size = 32;
va_list ap;
char *buf = dm_malloc(size);
*result = 0;
if (!buf)
return -1;
while (!ok) {
va_start(ap, format);
n = vsnprintf(buf, size, format, ap);
if (0 <= n && n < size)
ok = 1;
else {
dm_free(buf);
size *= 2;
buf = dm_malloc(size);
if (!buf)
return -1;
};
va_end(ap);
}
*result = dm_strdup(buf);
dm_free(buf);
return n + 1;
}
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