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69 lines
2.7 KiB
C
69 lines
2.7 KiB
C
23 years ago
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#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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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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};
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/* extract seconds */
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extern void taia_tai(const struct taia *source,struct tai *dest);
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/* get current time */
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extern void taia_now(struct taia *);
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/* return double-precision approximation; always nonnegative */
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extern double taia_approx(const struct taia *);
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/* return double-precision approximation of the fraction part;
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* always nonnegative */
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extern double taia_frac(const struct taia *);
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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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extern void taia_add(struct taia *dest,const struct taia *source1,const struct taia *source2);
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/* add secs seconds to source modulo 2^64 and put the result in dest. */
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extern void taia_addsec(struct taia *dest,const struct taia *source,int 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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extern void taia_sub(struct taia *,const struct taia *,const struct taia *);
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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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extern void taia_half(struct taia *dest,const struct taia *source);
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/* return 1 if a is less than b, 0 otherwise */
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extern int taia_less(const struct taia *a,const struct taia *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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extern void taia_pack(char *buf,const struct taia *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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extern void taia_unpack(const char *buf,struct taia *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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extern unsigned int taia_fmtfrac(char *s,const struct taia *t);
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/* initialize t to secs seconds. */
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extern void taia_uint(struct taia *t,unsigned int secs);
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#endif
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