102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*-
|
|
* Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org>
|
|
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <inttypes.h>
|
|
#include <libutil.h>
|
|
#include <stdint.h>
|
|
|
|
/*
|
|
* Convert an expression of the following forms to a uint64_t.
|
|
* 1) A positive decimal number.
|
|
* 2) A positive decimal number followed by a 'b' or 'B' (mult by 1).
|
|
* 3) A positive decimal number followed by a 'k' or 'K' (mult by 1 << 10).
|
|
* 4) A positive decimal number followed by a 'm' or 'M' (mult by 1 << 20).
|
|
* 5) A positive decimal number followed by a 'g' or 'G' (mult by 1 << 30).
|
|
* 6) A positive decimal number followed by a 't' or 'T' (mult by 1 << 40).
|
|
* 7) A positive decimal number followed by a 'p' or 'P' (mult by 1 << 50).
|
|
* 8) A positive decimal number followed by a 'e' or 'E' (mult by 1 << 60).
|
|
*/
|
|
int
|
|
expand_number(const char *buf, uint64_t *num)
|
|
{
|
|
uint64_t number;
|
|
unsigned shift;
|
|
char *endptr;
|
|
|
|
number = strtoumax(buf, &endptr, 0);
|
|
|
|
if (endptr == buf) {
|
|
/* No valid digits. */
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
switch (tolower((unsigned char)*endptr)) {
|
|
case 'e':
|
|
shift = 60;
|
|
break;
|
|
case 'p':
|
|
shift = 50;
|
|
break;
|
|
case 't':
|
|
shift = 40;
|
|
break;
|
|
case 'g':
|
|
shift = 30;
|
|
break;
|
|
case 'm':
|
|
shift = 20;
|
|
break;
|
|
case 'k':
|
|
shift = 10;
|
|
break;
|
|
case 'b':
|
|
case '\0': /* No unit. */
|
|
*num = number;
|
|
return (0);
|
|
default:
|
|
/* Unrecognized unit. */
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
if ((number << shift) >> shift != number) {
|
|
/* Overflow */
|
|
errno = ERANGE;
|
|
return (-1);
|
|
}
|
|
|
|
*num = number << shift;
|
|
return (0);
|
|
}
|