Mercurial > dovecot > core-2.2
view src/lib/utc-mktime.c @ 21390:2e2563132d5f
Updated copyright notices to include the year 2017.
author | Stephan Bosch <stephan.bosch@dovecot.fi> |
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date | Wed, 11 Jan 2017 02:51:13 +0100 |
parents | c27f1eac85b7 |
children | c4584d7dc07e |
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/* Copyright (c) 2007-2017 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; } #ifdef HAVE_TIMEGM time_t utc_mktime(const struct tm *tm) { struct tm mod_tm = *tm; time_t t; t = timegm(&mod_tm); if (tm_cmp(tm, &mod_tm) != 0) return (time_t)-1; return t; } #else 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 = (time_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; } #endif