30 lines
848 B
C
30 lines
848 B
C
#include "stddef.h"
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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const char* wday_str[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
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const char* mon_str[12] = { "Jan", "Feb", "Mar", "Ap", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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#define TIME_STR_MAX 27
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char* asctime(const struct tm* tm)
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{
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if (!tm) {
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__errno = EINVAL;
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return NULL;
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}
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if (tm->tm_wday > 6 || tm->tm_wday < 0 || tm->tm_mon < 0 || tm->tm_mon > 11) {
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errno = EINVAL;
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return NULL;
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}
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static char time_str[TIME_STR_MAX];
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snprintf(time_str, TIME_STR_MAX - 1, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
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wday_str[tm->tm_wday],
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mon_str[tm->tm_mon],
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tm->tm_mday, tm->tm_hour,
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tm->tm_min, tm->tm_sec,
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1900 + tm->tm_year);
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return time_str;
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} |