87 lines
3.0 KiB
C
87 lines
3.0 KiB
C
/****************************************************************************
|
|
* libs/libc/stdlib/lib_itoa.c
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
* SPDX-FileCopyrightText: 2010-2011 Gregory Nutt
|
|
* SPDX-FileCopyrightText: 2013 Brooks Automation, Inc. All rights reserved.
|
|
* SPDX-FileContributor: Ryan Sundberg <ryan.sundberg@brooks.com>
|
|
* SPDX-FileContributor: 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 <stdlib.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
FAR char *itoa(int val, FAR char *str, int base)
|
|
{
|
|
static FAR const char *digits = "0123456789abcdefghijklmnopqrstuvwxyz";
|
|
int intval = abs(val);
|
|
int digit;
|
|
int pos;
|
|
int len;
|
|
FAR char *buf = str;
|
|
char swap;
|
|
|
|
if (base >= 2 && base <= 36)
|
|
{
|
|
do
|
|
{
|
|
digit = intval % base;
|
|
intval = intval / base;
|
|
*buf++ = digits[digit];
|
|
}
|
|
while (intval > 0);
|
|
|
|
if (val < 0)
|
|
{
|
|
*buf++ = '-';
|
|
}
|
|
|
|
for (pos = 0, len = buf - str; pos < len / 2; pos++)
|
|
{
|
|
swap = str[len - pos - 1];
|
|
str[len - pos - 1] = str[pos];
|
|
str[pos] = swap;
|
|
}
|
|
}
|
|
|
|
*buf = '\0';
|
|
|
|
return str;
|
|
}
|