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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*!
* \file strtonum.h
*
* \brief Universal interface for safe conversion of strings to numbers.
*
* \author Jan Vcelak <jan.vcelak@nic.cz>
*
* \addtogroup common_lib
* @{
*/
#ifndef _KNOT_COMMON_STRTONUM_
#define _KNOT_COMMON_STRTONUM_
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include "common/errcode.h"
typedef long long int knot_strtoll_result_t;
typedef unsigned long long int knot_strtoull_result_t;
/*!
* \brief Convert string to signed integer.
*
* \param[in] src Input string.
* \param[out] dest Output integral value.
*
* \return Error code.
* \retval KNOT_EOK The conversion was successful.
* \retval KNOT_ERANGE The value is outside target type range.
* \retval KNOT_EMALF The input value is not terminated.
*/
static int knot_strtoll(const char *src, knot_strtoll_result_t *dest)
{
char *end;
knot_strtoll_result_t result = strtoll(src, &end, 10);
if (errno == ERANGE)
return KNOT_ERANGE;
if (src == end || *end != '\0')
return KNOT_EMALF;
*dest = result;
return KNOT_EOK;
}
/*!
* \brief Convert string to unsigned integer.
*
* \see knot_strtoll
*/
static int knot_strtoull(const char *src, knot_strtoull_result_t *dest)
{
char *end;
knot_strtoull_result_t result = strtoull(src, &end, 10);
if (errno == ERANGE)
return KNOT_ERANGE;
if (src == end || *end != '\0')
return KNOT_EMALF;
*dest = result;
return KNOT_EOK;
}
/*!
* \brief Helper macro defining body of individual conversion functions.
*
* \param type Target data type.
* \param function Underlying conversion function.
* \param min Minimal value valid for given data type.
* \param max Maximal value valid for given data type.
* \param src Pointer to source string.
* \param dest Pointer to destination type.
*
* \return Error code.
* \retval KNOT_EOK The conversion was successful.
* \retval KNOT_ERANGE The value is outside target type range.
* \retval KNOT_EMALF The input value is not terminated.
*/
#define KNOT_STR2NUM(type, function, min, max, src, dest) \
{ \
function##_result_t value; \
errno = 0; \
int result = function((src), &value); \
if (result != KNOT_EOK) \
return result; \
\
if (value < (min) || value > (max)) \
return KNOT_ERANGE; \
\
*(dest) = (type)value; \
return KNOT_EOK; \
}
inline static int knot_str2int(const char *src, int *dest)
{
KNOT_STR2NUM(int, knot_strtoll, INT_MIN, INT_MAX, src, dest)
}
inline static int knot_str2uint8t(const char *src, uint8_t *dest)
{
KNOT_STR2NUM(uint8_t, knot_strtoull, 0, UINT8_MAX, src, dest)
}
inline static int knot_str2uint16t(const char *src, uint16_t *dest)
{
KNOT_STR2NUM(uint16_t, knot_strtoull, 0, UINT16_MAX, src, dest)
}
#endif // _KNOT_COMMON_STRTONUM_
/*! @} */
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