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https://codeberg.org/grunfink/snac2.git
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110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
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#ifndef _XS_TIME_H
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#define _XS_TIME_H
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#include <time.h>
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xs_str *xs_str_time(time_t t, const char *fmt, int local);
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#define xs_str_localtime(t, fmt) xs_str_time(t, fmt, 1)
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#define xs_str_utctime(t, fmt) xs_str_time(t, fmt, 0)
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time_t xs_parse_iso_date(const char *iso_date, int local);
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time_t xs_parse_time(const char *str, const char *fmt, int local);
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#define xs_parse_localtime(str, fmt) xs_parse_time(str, fmt, 1)
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#define xs_parse_utctime(str, fmt) xs_parse_time(str, fmt, 0)
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xs_str *xs_str_time_diff(time_t time_diff);
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#ifdef XS_IMPLEMENTATION
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xs_str *xs_str_time(time_t t, const char *fmt, int local)
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/* returns a string with a formated time */
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{
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struct tm tm;
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char tmp[64];
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if (t == 0)
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t = time(NULL);
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if (local)
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localtime_r(&t, &tm);
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else
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gmtime_r(&t, &tm);
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strftime(tmp, sizeof(tmp), fmt, &tm);
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return xs_str_new(tmp);
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}
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xs_str *xs_str_time_diff(time_t time_diff)
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/* returns time_diff in seconds to 'human' units (d:hh:mm:ss) */
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{
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int secs = time_diff % 60;
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int mins = (time_diff /= 60) % 60;
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int hours = (time_diff /= 60) % 24;
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int days = (time_diff /= 24);
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return xs_fmt("%d:%02d:%02d:%02d", days, hours, mins, secs);
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}
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char *strptime(const char *s, const char *format, struct tm *tm);
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time_t xs_parse_time(const char *str, const char *fmt, int local)
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{
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time_t t = 0;
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#ifndef WITHOUT_STRPTIME
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struct tm tm = {0};
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strptime(str, fmt, &tm);
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/* try to guess the Daylight Saving Time */
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if (local)
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tm.tm_isdst = -1;
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t = local ? mktime(&tm) : timegm(&tm);
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#endif /* WITHOUT_STRPTIME */
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return t;
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}
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time_t xs_parse_iso_date(const char *iso_date, int local)
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/* parses a YYYY-MM-DDTHH:MM:SS date string */
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{
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time_t t = 0;
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#ifndef WITHOUT_STRPTIME
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t = xs_parse_time(iso_date, "%Y-%m-%dT%H:%M:%S", local);
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#else /* WITHOUT_STRPTIME */
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struct tm tm = {0};
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if (sscanf(iso_date, "%d-%d-%dT%d:%d:%d",
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&tm.tm_year, &tm.tm_mon, &tm.tm_mday,
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&tm.tm_hour, &tm.tm_min, &tm.tm_sec) == 6) {
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tm.tm_year -= 1900;
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tm.tm_mon -= 1;
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if (local)
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tm.tm_isdst = -1;
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t = local ? mktime(&tm) : timegm(&tm);
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}
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#endif /* WITHOUT_STRPTIME */
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return t;
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}
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#endif /* XS_IMPLEMENTATION */
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#endif /* _XS_TIME_H */
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