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/*
* Copyright (C) 2017-2018 Pali Rohár <pali.rohar@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <ctype.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include "libudffs.h"
const char *appname;
size_t gen_uuid_from_vol_set_ident(char uuid[17], const dstring *vol_set_ident, size_t size)
{
size_t i;
size_t len;
size_t nonhexpos;
unsigned char buf[127*4+1];
memset(buf, 0, sizeof(buf));
if (size > 0 && vol_set_ident[size-1] > 0 && vol_set_ident[size-1] < size)
len = decode_utf8((dchars *)vol_set_ident, (char *)buf, vol_set_ident[size-1], sizeof(buf));
else
len = 0;
if (len < 8)
{
uuid[0] = 0;
return (size_t)-1;
}
nonhexpos = 16;
for (i = 0; i < 16; ++i)
{
if (!isxdigit(buf[i]))
{
nonhexpos = i;
break;
}
}
if (nonhexpos < 8)
{
snprintf(uuid, 17, "%02x%02x%02x%02x%02x%02x%02x%02x",
buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6], buf[7]);
}
else if (nonhexpos < 16)
{
for (i = 0; i < 8; ++i)
uuid[i] = tolower(buf[i]);
snprintf(uuid + 8, 9, "%02x%02x%02x%02x",
buf[8], buf[9], buf[10], buf[11]);
}
else
{
for (i = 0; i < 16; ++i)
uuid[i] = tolower(buf[i]);
uuid[16] = 0;
}
if (nonhexpos < 16)
return nonhexpos;
return 16;
}
uint32_t strtou32(const char *str, int base, int *failed)
{
char *endptr = NULL;
long long int ret;
/* strtou* does not signal underflow, so use signed variant */
errno = 0;
ret = strtoll(str, &endptr, base);
/* strto* skips leading whitespaces, so detect them via isspace */
*failed = (!*str || isspace(*str) || *endptr || errno || ret < 0 || ret > UINT32_MAX) ? 1 : 0;
return ret;
}
uint16_t strtou16(const char *str, int base, int *failed)
{
uint32_t ret;
ret = strtou32(str, base, failed);
*failed = (*failed || ret > UINT16_MAX) ? 1 : 0;
return ret;
}
static inline unsigned int intlog2(unsigned int word)
{
unsigned int result = 0;
while (word >>= 1)
result++;
return result;
}
uint32_t randu32(void)
{
int fd;
uint32_t value;
unsigned int bits;
unsigned int rand_bits;
static int srand_done = 0;
fd = open("/dev/urandom", O_RDONLY);
if (fd >= 0)
{
if (read(fd, &value, sizeof(value)) == sizeof(value))
{
close(fd);
return value;
}
close(fd);
}
if (!srand_done)
{
srand(time(NULL) * getpid());
srand_done = 1;
}
value = 0;
rand_bits = intlog2((unsigned int)RAND_MAX+1);
for (bits = 0; bits < 32; bits += rand_bits)
{
value <<= rand_bits;
value |= rand();
}
return value;
}
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