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84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/* Copyright (c) Robert Walker, support@tunesmithy.co.uk
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* Free source. Do what you wish with it - treat it as you would
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* example code in a book on c programming.
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*/
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/* Note
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* When you include this header then all your time_t variables will become
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* __int64 variables.
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*
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* Be sure to check that routines that use them work with __int64 variables.
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* By way of example, if you use sprintf, fprintf, sscanf, fscanf etc
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* then you won't be able to use the %d format field for these variables
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* in a 32 bit build - they will overflow and be used for the next format field
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* as well. Instead convert your variables to unsigned ints and use %lu
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*
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* e.g.
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* sprintf(sz,"time_saved %lu secs",(UINT)time(NULL));
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*
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* {
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* time_t time_saved=0;
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* UINT utime_saved=0;
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* sscanf( sz, "%*s%lu", &utime_saved);
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* // read it in as an unsigned long as sscanf can't read to __int64 variables
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* // directly
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* time_saved=utime_saved;
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* }
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*
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* Unsigned ints are fine for dates until beyond the end of this century
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*
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* If your compiler has some other type of native 64 bit type then
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* change the line typedef __int64 t64
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*/
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#include <time.h>
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/*
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* Note. I think the usual time functions aren't thread safe becuase they use
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* a single struct for localtime, gmtime and mktime. Several threads
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* might access that same structure simultaneously.
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*
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* However we can make this implementation thread safe using thread local
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* variables if we so wish - simply define the tm struct that they
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* return to be thread local. But - I'm not sure if the pointer you get
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* back from localtime can be kept for any length of time with thread
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* local variables. Can the address for it change?? Anyone know?
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*
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* You can't use this method with DLLs that might be loaded using LoadLibrary
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* - see
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* http://msdn.microsoft.com/library/en-us/dllproc/base/dynamic_link_library_data.asp
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*/
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// #define USE_THREAD_LOCAL_VARIABLES
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#undef time
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#undef localtime
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#undef mktime
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#undef difftime
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#undef gmtime
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#define time time_64
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#define localtime localtime_64
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#define mktime mktime_64
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#define difftime difftime_64
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#define gmtime gmtime_64
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typedef __int64 t64;
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#define time_t t64
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t64 time_64(t64 *pt);
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struct tm *localtime_64(t64 *pt);
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double difftime_64(t64 time1, t64 time0);
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t64 mktime64( struct tm *today );
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struct tm *gmtime_64(t64 t);
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/* allow multiple inclusion of this file - does no harm, and we want
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* the last one to be effective if included several times
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* as in
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* #include "time64.h"
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* ...
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* #include <time.h>
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* ...
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* #include "time64.h"
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*/
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