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/*
* Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
* All rights reserved.
*
* 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 of VegaOS 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.
*/
#include <string.h>
static char *itoa_base10_convert(int64_t value, char *buf);
static char *
itoa_base10_convert(int64_t value, char *buf)
{
size_t i;
uint8_t tmp;
bool is_negative;
i = 0;
is_negative = false;
if (value == 0) {
buf[i++] = '0';
buf[i++] = '\0';
return buf;
}
if (value < 0) {
/* Easier to handle positive numbers */
value *= -1;
is_negative = true;
}
while (value > 0) {
buf[i++] = '0' + (value % 10);
value /= 10;
}
if (is_negative) {
buf[i++] = '-';
}
buf[i--] = '\0';
/* Result is in reverse */
for (int j = 0; j < i; ++j, --i) {
tmp = buf[j];
buf[j] = buf[i];
buf[i] = tmp;
}
return buf;
}
static char *
itoa_convert_base16(uint64_t n, char *buffer)
{
bool pad;
uint8_t nibble;
uint8_t i, j, tmp;
const char *ascii_nums = "0123456789ABCDEF";
i = 0;
pad = false;
if (n == 0) {
/* Zero, no need to parse */
memcpy(buffer, "0x00\0", 5);
return buffer;
}
/* If one digit, pad out 2 later */
if (n < 0x10) {
pad = true;
}
while (n > 0) {
nibble = (uint8_t)n & 0x0F;
nibble = ascii_nums[nibble];
buffer[i++] = nibble;
n >>= 4; /* Fetch next nibble */
}
if (pad) {
buffer[i++] = '0';
}
/* Add "0x" prefix */
buffer[i++] = 'x';
buffer[i++] = '0';
buffer[i--] = '\0';
/* Unreverse the result */
for (j = 0; j < i; ++j, --i) {
tmp = buffer[j];
buffer[j] = buffer[i];
buffer[i] = tmp;
}
return buffer;
}
char *
itoa(int64_t value, char *buf, int base)
{
switch (base) {
case 10:
return itoa_base10_convert(value, buf);
case 16:
return itoa_convert_base16(value, buf);
default:
return NULL;
}
}
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