29 lines
561 B
C
29 lines
561 B
C
#include "time_impl.h"
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#include <errno.h>
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time_t mktime(struct tm *tm)
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{
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struct tm new;
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long opp;
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long long t = __tm_to_secs(tm);
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__secs_to_zone(t, 1, &new.tm_isdst, &new.__tm_gmtoff, &opp, &new.__tm_zone);
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if (tm->tm_isdst>=0 && new.tm_isdst!=tm->tm_isdst)
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t -= opp - new.__tm_gmtoff;
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t -= new.__tm_gmtoff;
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if ((time_t)t != t) goto error;
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__secs_to_zone(t, 0, &new.tm_isdst, &new.__tm_gmtoff, &opp, &new.__tm_zone);
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if (__secs_to_tm(t + new.__tm_gmtoff, &new) < 0) goto error;
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*tm = new;
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return t;
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error:
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errno = EOVERFLOW;
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return -1;
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}
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