CydandClaude Fable 5
63312e07f9
- BORLAND/: Borland C++ 4.52 (chosen over 4.5 by byte-match: CODE/RP/CW32.LIB
is identical to 4.52's install lib). BCC32/TLINK32/TLIB/MAKE run natively on
Win11; CODE/BT/OPT.MAK is the shipped BTL4OPT.EXE's exact flag recipe
(extender = Borland PowerPack DPMI32, not Phar Lap TNT).
- restoration/source410/: the literal 1995-form reconstruction of the missing
BT game source (never mixed into CODE/). Round 1-3 state:
* 6 of 10 surviving original TUs COMPILE CLEAN under the period toolchain
(BTMSSN, BTCNSL, BTSCNRL, BTTEAM, BTL4MODE, BTL4ARND) - first builds
since 1996.
* BT_L4/BTL4APP.CPP pilot reconstruction: 12/12 functions, Fail() lands on
its binary-recorded line 400 exactly.
* BT/BTCNSL.HPP: console wire IDs recovered from the binary's ctors
(Killed=9, Damaged=10, ScoreUpdate=13, DeathWithoutHonor=15 [T1];
TeamScore=12 flagged [T4]).
* MUNGA/: 8 engine-header backfills back-dated from the BT412 WinTesla tree
(VDATA numbering decomp-verified; AUDREND's OpenAL-era virtual removed -
the period compiler is the drift detector).
* Tooling: backdate.py (WinTesla->1995 header transform), compile410.sh
(per-TU verification sweep under authentic OPT.MAK flags).
* README: corrected roadmap - MECH.HPP is the capstone grown with the mech
TU reconstructions; BTREG.CPP green = the header-family milestone.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
79 lines
2.0 KiB
Plaintext
79 lines
2.0 KiB
Plaintext
/*------------------------------------------------------------------------
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* filename - tan.cas
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*
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* function(s)
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* tan - trigonometric tangent function
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*-----------------------------------------------------------------------*/
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/*
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* C/C++ Run Time Library - Version 6.5
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*
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* Copyright (c) 1987, 1994 by Borland International
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* All Rights Reserved.
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*
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*/
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#pragma inline
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#include <asmrules.h>
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#include <_math.h>
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#include <math.h>
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#include <errno.h>
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#include <stddef.h>
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static unsigned short NANTRIG [4] = {0,0,0x0420, 0x7FF8};
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/*--------------------------------------------------------------------------*
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Name tan - trigonometric tangent function
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Usage double tan(double x);
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Prototype in math.h
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Description tan returns the tangent of the input value. Angles are
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specified in radians.
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Return value tan returns any value for valid angles.
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For very large arguments (magnitude 2^53 or greater) all
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precision is lost. This occurs "silently" since the ANSI C
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spec does not specify an error return.
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*---------------------------------------------------------------------------*/
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double _FARFUNC tan( double x )
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{
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asm FLD DOUBLE (x)
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asm mov ax, 7FF0h
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asm and ax, W0 (x [6]) /* extract the exponent field */
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asm cmp ax, (53 * 16) + 3FF0h /* biased version of exponent 53 */
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asm jae tan_tooLarge
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#ifdef _Windows
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_f87_Tangent();
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#else
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if (_8087 >= 3)
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{
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asm db OPCODE_FSINCOS
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asm FDIV
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}
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else
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{
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asm _FAST_ (_FTAN_)
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}
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#endif
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tan_end:
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#pragma noretval
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return;
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tan_tooLarge: /* total loss of precision */
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asm FSTP ST(0) /* pop x from stack */
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#pragma warn -ret
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return __matherr (TLOSS, "tan", &x, NULL, *((double *) NANTRIG));
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#pragma warn .ret
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}
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