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/*
* Copyright (c) 2025, Ian Moffett.
* Provided under the BSD-3 clause.
*/
#include <sdk/types.h>
#include <sdk/string.h>
static char *itoa_base10_convert(QUAD value, char *buf);
static char *
itoa_base10_convert(QUAD value, char *buf)
{
UQUAD i;
UBYTE 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(UQUAD n, char *buffer)
{
BOOL pad;
UBYTE nibble;
UBYTE 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 = (UBYTE)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(QUAD 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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