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// SPDX-License-Identifier: GPL-3.0-or-later
#include "../libnetdata.h"
#include "rfc3339.h"
size_t rfc3339_datetime_ut(char *buffer, size_t len, usec_t now_ut, size_t fractional_digits, bool utc) {
if (!buffer || len == 0)
return 0;
time_t t = (time_t)(now_ut / USEC_PER_SEC);
struct tm *tmp, tmbuf;
if (utc)
tmp = gmtime_r(&t, &tmbuf);
else
tmp = localtime_r(&t, &tmbuf);
if (!tmp) {
buffer[0] = '\0';
return 0;
}
size_t used_length = strftime(buffer, len, "%Y-%m-%dT%H:%M:%S", tmp);
if (used_length == 0) {
buffer[0] = '\0';
return 0;
}
if (fractional_digits >= 1 && fractional_digits <= 9) {
int fractional_part = (int)(now_ut % USEC_PER_SEC);
if (fractional_part && len - used_length > fractional_digits + 1) {
char format[] = ".%01d";
format[3] = (char)('0' + fractional_digits);
// Adjust fractional part
fractional_part /= (int)pow(10, 6 - fractional_digits);
used_length += snprintf(buffer + used_length, len - used_length,
format, fractional_part);
}
}
if (utc) {
if (used_length + 1 < len) {
buffer[used_length++] = 'Z';
buffer[used_length] = '\0';
}
}
else {
long offset = tmbuf.tm_gmtoff;
int hours = (int)(offset / 3600);
int minutes = abs((int)((offset % 3600) / 60));
if (used_length + 7 < len) { // Space for "+HH:MM\0"
used_length += snprintf(buffer + used_length, len - used_length, "%+03d:%02d", hours, minutes);
}
}
return used_length;
}
usec_t rfc3339_parse_ut(const char *rfc3339, char **endptr) {
struct tm tm = { 0 };
int tz_hours = 0, tz_mins = 0;
char *s;
usec_t timestamp, usec = 0;
// Use strptime to parse up to seconds
s = strptime(rfc3339, "%Y-%m-%dT%H:%M:%S", &tm);
if (!s)
return 0; // Parsing error
// Parse fractional seconds if present
if (*s == '.') {
char *next;
usec = strtoul(s + 1, &next, 10);
int digits_parsed = (int)(next - (s + 1));
if (digits_parsed < 1 || digits_parsed > 9)
return 0; // parsing error
static const usec_t fix_usec[] = {
1000000, // 0 digits (not used)
100000, // 1 digit
10000, // 2 digits
1000, // 3 digits
100, // 4 digits
10, // 5 digits
1, // 6 digits
10, // 7 digits
100, // 8 digits
1000, // 9 digits
};
usec = digits_parsed <= 6 ? usec * fix_usec[digits_parsed] : usec / fix_usec[digits_parsed];
s = next;
}
// Check and parse timezone if present
int tz_offset = 0;
if (*s == '+' || *s == '-') {
// Parse the hours:mins part of the timezone
if (!isdigit((uint8_t)s[1]) || !isdigit((uint8_t)s[2]) || s[3] != ':' ||
!isdigit((uint8_t)s[4]) || !isdigit((uint8_t)s[5]))
return 0; // Parsing error
char tz_sign = *s;
tz_hours = (s[1] - '0') * 10 + (s[2] - '0');
tz_mins = (s[4] - '0') * 10 + (s[5] - '0');
tz_offset = tz_hours * 3600 + tz_mins * 60;
tz_offset *= (tz_sign == '+' ? 1 : -1);
s += 6; // Move past the timezone part
}
else if (*s == 'Z')
s++;
else
return 0; // Invalid RFC 3339 format
// Convert to time_t (assuming local time, then adjusting for timezone later)
time_t epoch_s = mktime(&tm);
if (epoch_s == -1)
return 0; // Error in time conversion
timestamp = (usec_t)epoch_s * USEC_PER_SEC + usec;
timestamp -= tz_offset * USEC_PER_SEC;
if(endptr)
*endptr = s;
return timestamp;
}
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