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/*
* timexsup.h - 'struct timex' support functions
*
* Written by Juergen Perlinger (perlinger@ntp.org) for the NTP project.
* The contents of 'html/copyright.html' apply.
*/
#ifndef TIMEXSUP_H
#define TIMEXSUP_H
/* convert a 'long' time value (in usec or nsec) into seconds, expressed
* as a 'double'. If 'STA_NANO' is not defined, this will always convert
* from usec. ('STA_NANO' is Linux specific at the time of this
* writing.)
*
* If 'STA_NANO' is defined, it will be checked in 'status' to decide
* which time base (usec or nsec) applies for this conversion.
*/
extern double dbl_from_var_long(long lval, int status);
/* convert a 'long' time value in usec into seconds, expressed as
* 'double'. This function is there for pure symmetry right now -- it
* just casts and scales without any additional bells and whistles.
*/
extern double dbl_from_usec_long(long lval);
/* If MOD_NANO is defined, set the MOD_NANO bit in '*modes' and
* calculate the time stamp in nsec; otherwise, calculate the result in
* usec.
*
* Applies proper bounds checks and saturation on LONG_MAX/LONG_MIN to
* avoid undefined behaviour.
*/
extern long var_long_from_dbl(double dval, unsigned int *modes);
/* convert a 'double' time value (in seconds) into usec with proper
* bounds check and range clamp.
*/
extern long usec_long_from_dbl(double dval);
#endif
/* -*- that's all folks -*- */
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