Annotation of embedaddon/ntp/libntp/tsftomsu.c, revision 1.1
1.1 ! misho 1: /*
! 2: * tsftomsu - convert from a time stamp fraction to milliseconds
! 3: */
! 4: #include "ntp_fp.h"
! 5: #include "ntp_stdlib.h"
! 6:
! 7: int
! 8: tsftomsu(
! 9: u_long tsf,
! 10: int round
! 11: )
! 12: {
! 13: register long val_ui, val_uf;
! 14: register long tmp_ui, tmp_uf;
! 15: register int i;
! 16:
! 17: /*
! 18: * Essentially, multiply by 10 three times in l_fp form.
! 19: * The integral part is the milliseconds.
! 20: */
! 21: val_ui = 0;
! 22: val_uf = tsf;
! 23: for (i = 3; i > 0; i--) {
! 24: M_LSHIFT(val_ui, val_uf);
! 25: tmp_ui = val_ui;
! 26: tmp_uf = val_uf;
! 27: M_LSHIFT(val_ui, val_uf);
! 28: M_LSHIFT(val_ui, val_uf);
! 29: M_ADD(val_ui, val_uf, tmp_ui, tmp_uf);
! 30: }
! 31:
! 32: /*
! 33: * Round the value if need be, then return it.
! 34: */
! 35: if (round && (val_uf & 0x80000000))
! 36: val_ui++;
! 37: return (int)val_ui;
! 38: }
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