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68 lines
2.5 KiB
68 lines
2.5 KiB
#ifndef TAIA_H |
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#define TAIA_H |
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/* Times with 1 attosecond precision */ |
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#include "tai.h" |
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/* A struct taia value is a number between 0 inclusive and 2^64 |
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* exclusive. The number is a multiple of 10^-18. The format of struct |
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* taia is designed to speed up common operations; applications should |
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* not look inside struct taia. */ |
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typedef struct taia { |
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struct tai sec; |
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unsigned long nano; /* 0...999999999 */ |
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unsigned long atto; /* 0...999999999 */ |
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} tai6464; |
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/* extract seconds */ |
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void taia_tai(const tai6464 *source,tai64 *dest); |
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/* get current time */ |
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void taia_now(struct taia *); |
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/* return double-precision approximation; always nonnegative */ |
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double taia_approx(const tai6464 *); |
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/* return double-precision approximation of the fraction part; |
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* always nonnegative */ |
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double taia_frac(const tai6464 *); |
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/* add source1 to source2 modulo 2^64 and put the result in dest. |
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* The inputs and output may overlap */ |
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void taia_add(tai6464 *dest,const tai6464 *source1,const tai6464 *source2); |
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/* add secs seconds to source modulo 2^64 and put the result in dest. */ |
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void taia_addsec(tai6464 *dest,const tai6464 *source,long secs); |
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/* subtract source2 from source1 modulo 2^64 and put the result in dest. |
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* The inputs and output may overlap */ |
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void taia_sub(tai6464 *,const tai6464 *,const tai6464 *); |
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/* divide source by 2, rouding down to a multiple of 10^-18, and put the |
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* result into dest. The input and output may overlap */ |
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void taia_half(tai6464 *dest,const tai6464 *source); |
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/* return 1 if a is less than b, 0 otherwise */ |
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int taia_less(const tai6464 *a,const tai6464 *b); |
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#define TAIA_PACK 16 |
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/* char buf[TAIA_PACK] can be used to store a TAI64NA label in external |
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* representation, which can then be used to transmit the binary |
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* representation over a network or store it on disk in a byte order |
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* independent fashion */ |
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/* convert a TAI64NA label from internal format in src to external |
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* TAI64NA format in buf. */ |
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void taia_pack(char *buf,const tai6464 *src); |
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/* convert a TAI64NA label from external TAI64NA format in buf to |
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* internal format in dest. */ |
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void taia_unpack(const char *buf,tai6464 *dest); |
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#define TAIA_FMTFRAC 19 |
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/* print the 18-digit fraction part of t in decimal, without a decimal |
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* point but with leading zeros, into the character buffer s, without a |
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* terminating \0. It returns 18, the number of characters written. s |
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* may be zero; then taia_fmtfrac returns 18 without printing anything. |
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* */ |
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unsigned int taia_fmtfrac(char *s,const tai6464 *t); |
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/* initialize t to secs seconds. */ |
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void taia_uint(tai6464 *t,unsigned int secs); |
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#endif
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