minix/lib/nbsd_libc/gen/dehumanize_number.c

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/* $NetBSD: dehumanize_number.c,v 1.3 2008/04/28 20:22:59 martin Exp $ */
/*
* Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Julio M. Merino Vidal, developed as part of Google's Summer of Code
* 2005 program.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: dehumanize_number.c,v 1.3 2008/04/28 20:22:59 martin Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <inttypes.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
/*
* Converts the number given in 'str', which may be given in a humanized
* form (as described in humanize_number(3), but with some limitations),
* to an int64_t without units.
* In case of success, 0 is returned and *size holds the value.
* Otherwise, -1 is returned and *size is untouched.
*
* TODO: Internationalization, SI units.
*/
int
dehumanize_number(const char *str, int64_t *size)
{
char *ep, unit;
const char *delimit;
long multiplier;
long long tmp, tmp2;
size_t len;
len = strlen(str);
if (len == 0) {
errno = EINVAL;
return -1;
}
multiplier = 1;
unit = str[len - 1];
if (isalpha((unsigned char)unit)) {
switch (tolower((unsigned char)unit)) {
case 'b':
multiplier = 1;
break;
case 'k':
multiplier = 1024;
break;
case 'm':
multiplier = 1024 * 1024;
break;
case 'g':
multiplier = 1024 * 1024 * 1024;
break;
default:
errno = EINVAL;
return -1; /* Invalid suffix. */
}
delimit = &str[len - 1];
} else
delimit = NULL;
errno = 0;
tmp = strtoll(str, &ep, 10);
if (str[0] == '\0' || (ep != delimit && *ep != '\0'))
return -1; /* Not a number. */
else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
return -1; /* Out of range. */
tmp2 = tmp * multiplier;
tmp2 = tmp2 / multiplier;
if (tmp != tmp2) {
errno = ERANGE;
return -1; /* Out of range. */
}
*size = tmp * multiplier;
return 0;
}