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/*
* Copyright (c) 2013-2014 Balabit
* Copyright (c) 2013 Gergely Nagy <algernon@balabit.hu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "parse-number.h"
#include <string.h>
#include <errno.h>
#include <stdlib.h>
static gboolean
_valid_unit(const gchar unit_char)
{
return (unit_char == 'B' || unit_char == 'b');
}
static gboolean
_valid_exponent(const gchar exponent_char)
{
gchar e = exponent_char;
return e == 'k' || e == 'K' ||
e == 'm' || e == 'M' ||
e == 'g' || e == 'G';
}
static gboolean
_parse_suffix(const gchar *suffix, gchar *exponent_char, gchar *base_char, gchar *unit_char)
{
gint suffix_len;
suffix_len = strlen(suffix);
if (suffix_len > 3)
return FALSE;
if (suffix_len == 0)
return TRUE;
if (suffix_len == 3)
{
*exponent_char = suffix[0];
*base_char = suffix[1];
*unit_char = suffix[2];
}
else if (suffix_len == 2)
{
*exponent_char = suffix[0];
if (_valid_unit(suffix[1]))
*unit_char = suffix[1];
else
*base_char = suffix[1];
}
else if (suffix_len == 1)
{
if (_valid_exponent(suffix[0]))
*exponent_char = suffix[0];
else if (_valid_unit(suffix[0]))
*unit_char = suffix[0];
else
return FALSE;
}
return TRUE;
}
static gboolean
_determine_multiplier(gchar base_char, gint *multiplier)
{
if (base_char == 0)
*multiplier = 1000;
else if (base_char == 'I' || base_char == 'i')
*multiplier = 1024;
else
return FALSE;
return TRUE;
}
static gboolean
_validate_unit(gchar unit_char)
{
if (unit_char && !_valid_unit(unit_char))
return FALSE;
return TRUE;
}
static gboolean
_process_exponent(gchar exponent_char, gint64 *d, gint multiplier)
{
switch (exponent_char)
{
case 'G':
case 'g':
(*d) *= multiplier;
case 'm':
case 'M':
(*d) *= multiplier;
case 'K':
case 'k':
(*d) *= multiplier;
case 0:
return TRUE;
default:
return FALSE;
}
}
static gboolean
_process_suffix(const gchar *suffix, gint64 *d)
{
gchar exponent_char = 0, base_char = 0, unit_char = 0;
gint multiplier = 0;
if (!_parse_suffix(suffix, &exponent_char, &base_char, &unit_char))
return FALSE;
if (!_determine_multiplier(base_char, &multiplier))
return FALSE;
if (!_validate_unit(unit_char))
return FALSE;
if (!_process_exponent(exponent_char, d, multiplier))
return FALSE;
return TRUE;
}
static gboolean
_parse_number(const gchar *s, gchar **endptr, gint64 *d)
{
gint64 val;
errno = 0;
val = strtoll(s, endptr, 10);
if (errno == ERANGE || errno == EINVAL)
return FALSE;
if (*endptr == s)
return FALSE;
*d = val;
return TRUE;
}
gboolean
parse_number(const gchar *s, gint64 *d)
{
gchar *endptr;
if (!_parse_number(s, &endptr, d))
return FALSE;
if (*endptr)
return FALSE;
return TRUE;
}
gboolean
parse_number_with_suffix(const gchar *s, gint64 *d)
{
gchar *endptr;
if (!_parse_number(s, &endptr, d))
return FALSE;
return _process_suffix(endptr, d);
}
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