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/*
* Copyright (C) 2007, 2008 Nokia Corporation
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* This file contains various common stuff.
*
* Authors: Artem Bityutskiy
* Adrian Hunter
*/
#define PROGRAM_NAME "mtd-utils"
#include <sys/time.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include "common.h"
/**
* get_multiplier - convert size specifier to an integer multiplier.
* @str: the size specifier string
*
* This function parses the @str size specifier, which may be one of
* 'KiB', 'MiB', or 'GiB' into an integer multiplier. Returns positive
* size multiplier in case of success and %-1 in case of failure.
*/
static int get_multiplier(const char *str)
{
if (!str)
return 1;
/* Remove spaces before the specifier */
while (*str == ' ' || *str == '\t')
str += 1;
if (!strcmp(str, "KiB"))
return 1024;
if (!strcmp(str, "MiB"))
return 1024 * 1024;
if (!strcmp(str, "GiB"))
return 1024 * 1024 * 1024;
return -1;
}
/**
* util_get_bytes - convert a string containing amount of bytes into an
* integer
* @str: string to convert
*
* This function parses @str which may have one of 'KiB', 'MiB', or 'GiB'
* size specifiers. Returns positive amount of bytes in case of success and %-1
* in case of failure.
*/
long long util_get_bytes(const char *str)
{
char *endp;
long long bytes = strtoull(str, &endp, 0);
if (endp == str || bytes < 0) {
fprintf(stderr, "incorrect amount of bytes: \"%s\"\n", str);
return -1;
}
if (*endp != '\0') {
int mult = get_multiplier(endp);
if (mult == -1) {
fprintf(stderr, "bad size specifier: \"%s\" - "
"should be 'KiB', 'MiB' or 'GiB'\n", endp);
return -1;
}
bytes *= mult;
}
return bytes;
}
/**
* util_print_bytes - print bytes.
* @bytes: variable to print
* @bracket: whether brackets have to be put or not
*
* This is a helper function which prints amount of bytes in a human-readable
* form, i.e., it prints the exact amount of bytes following by the approximate
* amount of Kilobytes, Megabytes, or Gigabytes, depending on how big @bytes
* is.
*/
void util_print_bytes(long long bytes, int bracket)
{
const char *p;
if (bracket)
p = " (";
else
p = ", ";
printf("%lld bytes", bytes);
if (bytes > 1024 * 1024 * 1024)
printf("%s%.1f GiB", p, (double)bytes / (1024 * 1024 * 1024));
else if (bytes > 1024 * 1024)
printf("%s%.1f MiB", p, (double)bytes / (1024 * 1024));
else if (bytes > 1024 && bytes != 0)
printf("%s%.1f KiB", p, (double)bytes / 1024);
else
return;
if (bracket)
printf(")");
}
/**
* util_srand - randomly seed the standard pseudo-random generator.
*
* This helper function seeds the standard libc pseudo-random generator with a
* more or less random value to make sure the 'rand()' call does not return the
* same sequence every time UBI utilities run. Returns zero in case of success
* and a %-1 in case of error.
*/
int util_srand(void)
{
struct timeval tv;
struct timezone tz;
unsigned int seed;
/*
* Just assume that a combination of the PID + current time is a
* reasonably random number.
*/
if (gettimeofday(&tv, &tz))
return -1;
seed = (unsigned int)tv.tv_sec;
seed += (unsigned int)tv.tv_usec;
seed *= getpid();
seed %= RAND_MAX;
srand(seed);
return 0;
}
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