Mercurial > dovecot > core-2.2
view src/lib/utc-mktime.c @ 12782:447bce266022
Updated copyright notices to include year 2011.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Fri, 04 Mar 2011 20:54:29 +0200 |
parents | 615eef3139c2 |
children | ba770cba5598 |
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/* Copyright (c) 2007-2011 Dovecot authors, see the included COPYING file */ #include "lib.h" #include "utc-mktime.h" static int tm_cmp(const struct tm *tm1, const struct tm *tm2) { int diff; if ((diff = tm1->tm_year - tm2->tm_year) != 0) return diff; if ((diff = tm1->tm_mon - tm2->tm_mon) != 0) return diff; if ((diff = tm1->tm_mday - tm2->tm_mday) != 0) return diff; if ((diff = tm1->tm_hour - tm2->tm_hour) != 0) return diff; if ((diff = tm1->tm_min - tm2->tm_min) != 0) return diff; return tm1->tm_sec - tm2->tm_sec; } time_t utc_mktime(const struct tm *tm) { const struct tm *try_tm; time_t t; int bits, dir; /* we'll do a binary search across the entire valid time_t range. when gmtime()'s output matches the tm parameter, we've found the correct time_t value. this also means that if tm contains invalid values, -1 is returned. */ #ifdef TIME_T_SIGNED t = 0; #else t = 1 << (TIME_T_MAX_BITS - 1); #endif for (bits = TIME_T_MAX_BITS - 2;; bits--) { try_tm = gmtime(&t); dir = tm_cmp(tm, try_tm); if (dir == 0) return t; if (bits < 0) break; if (dir < 0) t -= (time_t)1 << bits; else t += (time_t)1 << bits; } return (time_t)-1; }