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/*
* common.c
* contains some common functions
*
* Copyright (c) 2026 Nikias Bassen, All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <math.h>
#include <stdio.h>
#include <stdint.h>
#include "common.h"
size_t dtostr(char *buf, size_t bufsize, double realval)
{
int slen = 0;
if (isnan(realval)) {
slen = snprintf(buf, bufsize, "nan");
} else if (isinf(realval)) {
slen = snprintf(buf, bufsize, "%cinfinity", (realval > 0.0) ? '+' : '-');
} else if (realval == 0.0f) {
slen = snprintf(buf, bufsize, "0.0");
} else {
slen = snprintf(buf, bufsize, "%.*g", 17, realval);
if (slen < 0) {
return 0;
}
if (!buf || bufsize == 0) {
return (size_t)slen;
}
size_t len = (size_t)slen;
if (len >= bufsize) {
len = bufsize - 1;
}
size_t i = 0;
for (i = 0; i < len; i++) {
if (buf[i] == ',') {
buf[i] = '.';
break;
} else if (buf[i] == '.') {
break;
}
}
return len;
}
if (slen < 0) {
return 0;
}
return (size_t)slen;
}
/* based on https://stackoverflow.com/a/4143288 */
#define PO10i_LIMIT (INT64_MAX/10)
int num_digits_i(int64_t i)
{
int n;
int64_t po10;
n=1;
if (i < 0) {
i = (i == INT64_MIN) ? INT64_MAX : -i;
n++;
}
po10=10;
while (i>=po10) {
n++;
if (po10 > PO10i_LIMIT) break;
po10*=10;
}
return n;
}
#undef PO10i_LIMIT
/* based on https://stackoverflow.com/a/4143288 */
#define PO10u_LIMIT (UINT64_MAX/10)
int num_digits_u(uint64_t i)
{
int n;
uint64_t po10;
n=1;
po10=10;
while (i>=po10) {
n++;
if (po10 > PO10u_LIMIT) break;
po10*=10;
}
return n;
}
#undef PO10u_LIMIT
int plist_real_to_time64(double realval, Time64_T *timev)
{
if (!timev || !isfinite(realval)) {
return -1;
}
if (realval < (double)TIME64_MIN - (double)MAC_EPOCH ||
realval > (double)TIME64_MAX - (double)MAC_EPOCH) {
return -1;
}
*timev = (Time64_T)realval + MAC_EPOCH;
return 0;
}