nuttx/libs/libc/stdlib/lib_strtoll.c

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/****************************************************************************
* libs/libc/stdlib/lib_strtoll.c
*
* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdbool.h>
#include <stdlib.h>
#include <errno.h>
#include "libc.h"
#ifdef CONFIG_HAVE_LONG_LONG
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: strtoll
*
* Description:
* The strtoll() function converts the initial part of the string in
* nptr to a long long integer value according to the given base, which
* must be between 2 and 36 inclusive, or be the special value 0.
*
* Returned Value:
* - The converted value, if the base and number are valid
* - 0 if an error occurs, and set errno to:
* * EINVAL if base < 2 or base > 36
* - LLONG_MIN or LLONG_MAX, of correct sign, if an overflow occurs,
* and set errno to:
* * ERANGE if the number cannot be represented using long long
*
****************************************************************************/
2014-04-13 22:32:20 +02:00
2015-11-18 20:22:43 +01:00
long long strtoll(FAR const char *nptr, FAR char **endptr, int base)
{
unsigned long long accum = 0;
bool negate = false;
if (nptr)
{
/* Skip leading spaces */
lib_skipspace(&nptr);
/* Check for leading + or - */
if (*nptr == '-')
{
negate = true;
nptr++;
}
else if (*nptr == '+')
{
nptr++;
}
/* Get the unsigned value */
accum = strtoull(nptr, endptr, base);
/* Correct the sign of the result and check for overflow */
if (negate)
{
const unsigned long long limit = ((unsigned long long)-(LLONG_MIN + 1)) + 1;
if (accum > limit)
{
set_errno(ERANGE);
return LLONG_MIN;
}
return (accum == limit) ? LLONG_MIN : -(long long)accum;
}
if (accum > LLONG_MAX)
{
set_errno(ERANGE);
return LLONG_MAX;
}
}
return (long long)accum;
}
#endif