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73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/str/str.h"
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#include "libc/time/struct/tm.h"
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/**
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* @fileoverview High performance ISO-8601 timestamp formatter.
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*/
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char *GetTimestamp(void) {
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int x;
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struct timespec ts;
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_Thread_local static long last;
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_Thread_local static char s[27];
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_Thread_local static struct tm tm;
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clock_gettime(0, &ts);
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if (ts.tv_sec != last) {
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localtime_r(&ts.tv_sec, &tm);
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x = tm.tm_year + 1900;
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s[0] = '0' + x / 1000;
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s[1] = '0' + x / 100 % 10;
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s[2] = '0' + x / 10 % 10;
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s[3] = '0' + x % 10;
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s[4] = '-';
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x = tm.tm_mon + 1;
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s[5] = '0' + x / 10;
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s[6] = '0' + x % 10;
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s[7] = '-';
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x = tm.tm_mday;
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s[8] = '0' + x / 10;
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s[9] = '0' + x % 10;
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s[10] = 'T';
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x = tm.tm_hour;
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s[11] = '0' + x / 10;
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s[12] = '0' + x % 10;
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s[13] = ':';
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x = tm.tm_min;
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s[14] = '0' + x / 10;
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s[15] = '0' + x % 10;
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s[16] = ':';
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x = tm.tm_sec;
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s[17] = '0' + x / 10;
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s[18] = '0' + x % 10;
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s[19] = '.';
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s[26] = 0;
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last = ts.tv_sec;
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}
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x = ts.tv_nsec;
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s[20] = '0' + x / 100000000;
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s[21] = '0' + x / 10000000 % 10;
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s[22] = '0' + x / 1000000 % 10;
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s[23] = '0' + x / 100000 % 10;
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s[24] = '0' + x / 10000 % 10;
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s[25] = '0' + x / 1000 % 10;
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return s;
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}
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int main(int argc, char *argv[]) {
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char buf[128], *p = buf;
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p = stpcpy(p, GetTimestamp());
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p = stpcpy(p, "\n");
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write(1, buf, p - buf);
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}
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