2024-12-07 21:56:55 -06:00

175 lines
3.0 KiB
C

#include <stdint.h>
#include <stdbool.h>
#include "minmax.h"
#include "unparse.h"
int digits_base10(uint32_t n)
{
if (n >= 1000000000ul) return 10;
if (n >= 100000000ul) return 9;
if (n >= 10000000ul) return 8;
if (n >= 1000000ul) return 7;
if (n >= 100000ul) return 6;
if (n >= 10000ul) return 5;
if (n >= 1000ul) return 4;
if (n >= 100ul) return 3;
if (n >= 10ul) return 2;
return 1;
}
int unparse_base10(char * s, int32_t n, int len, char fill)
{
bool negative = false;
int digits = 0;
if (n < 0) {
digits += 1;
n = -n;
negative = true;
}
digits += digits_base10(n);
len = max(digits, len);
int ret = len;
while (len > digits) {
*s++ = fill;
--len;
}
if (negative) {
*s++ = '-';
len--;
}
while (len > 0) {
const uint32_t digit = n % 10;
n = n / 10;
s[--len] = digit + 48;
}
return ret;
}
int digits_base10_64(uint64_t n)
{
if (n >= 10000000000000000000ull) return 20;
if (n >= 1000000000000000000ull) return 19;
if (n >= 100000000000000000ull) return 18;
if (n >= 10000000000000000ull) return 17;
if (n >= 1000000000000000ull) return 16;
if (n >= 100000000000000ull) return 15;
if (n >= 10000000000000ull) return 14;
if (n >= 1000000000000ull) return 13;
if (n >= 100000000000ull) return 12;
if (n >= 10000000000ull) return 11;
if (n >= 1000000000ull) return 10;
if (n >= 100000000ull) return 9;
if (n >= 10000000ull) return 8;
if (n >= 1000000ull) return 7;
if (n >= 100000ull) return 6;
if (n >= 10000ull) return 5;
if (n >= 1000ull) return 4;
if (n >= 100ull) return 3;
if (n >= 10ull) return 2;
return 1;
}
int unparse_base10_64(char * s, int64_t n, int len, char fill)
{
bool negative = false;
int digits = 0;
if (n < 0) {
digits += 1;
n = -n;
negative = true;
}
digits += digits_base10_64(n);
len = max(digits, len);
int ret = len;
while (len > digits) {
*s++ = fill;
--len;
}
if (negative) {
*s++ = '-';
len--;
}
while (len > 0) {
const uint32_t digit = n % 10;
n = n / 10;
s[--len] = digit + 48;
}
return ret;
}
static int digits_base16(uint32_t n)
{
if (n <= 0xf) return 1;
if (n <= 0xff) return 2;
if (n <= 0xfff) return 3;
if (n <= 0xffff) return 4;
if (n <= 0xfffff) return 5;
if (n <= 0xffffff) return 6;
if (n <= 0xfffffff) return 7;
return 8;
}
int unparse_base16(char * s, uint32_t n, int len, char fill)
{
int digits = digits_base16(n);
len = max(digits, len);
int ret = len;
while (len > digits) {
*s++ = fill;
--len;
}
while (len > 0) {
uint32_t nib = n & 0xf;
n = n >> 4;
if (nib > 9) {
nib += (97 - 10);
} else {
nib += (48 - 0);
}
s[--len] = nib;
}
return ret;
}
#ifdef UNPARSE_TEST
#include <stdio.h>
int main()
{
char s[1024];
{
int n = 124;
int offset = unparse_base10(s, n, 6, ' ');
s[offset] = 0;
printf("`%s`\n", s);
}
{
int n = 0x5678;
int offset = unparse_base16(s, n, 7, '0');
s[offset] = 0;
printf("`%s`\n", s);
}
}
#endif