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robfinch |
; ============================================================================
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; __
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; \\__/ o\ (C) 2022 Robert Finch, Waterloo
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; \ __ / All rights reserved.
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; \/_// robfinch@opencores.org
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; ||
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;
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;
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; BSD 3-Clause License
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions are met:
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;
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; 1. Redistributions of source code must retain the above copyright notice, this
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; list of conditions and the following disclaimer.
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;
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; 2. Redistributions in binary form must reproduce the above copyright notice,
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; this list of conditions and the following disclaimer in the documentation
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; and/or other materials provided with the distribution.
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;
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; 3. Neither the name of the copyright holder nor the names of its
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; contributors may be used to endorse or promote products derived from
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; this software without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;
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; ============================================================================
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;
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; Get a floating point number
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;
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_GetFloatGetChar:
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move.b (a0),d1
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add.l d0,a0
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rts
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_GetFloatIgnBlanks:
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.0001
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bsr _GetFloatGetChar
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cmpi.b #' ',d1
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beq .0001
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_GetFloatBackupChar:
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sub.l d0,a0
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rts
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;-------------------------------------------------------------------------------
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; Get fractional part of a number, 25 digits max, into a float register.
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;
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; Register Usage:
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; d1 = digit from input screen
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; d4 = digit count
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; d6 = digit scaling factor
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; fp1 = digit as float number
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; Returns:
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; fp0 = fraction
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;-------------------------------------------------------------------------------
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_GetFraction:
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link a2,#-28
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move.l _canary,24(sp)
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movem.l d1/d4/d6,(sp)
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fmove.x fp1,12(sp)
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clr.l d6 ; d6 = scale factor
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fmove.w #0,fp0 ; fract = 0.0
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moveq #24,d4
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.0002
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bsr _GetFloatGetChar
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cmpi.b #'0',d1
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blo .0001
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cmpi.b #'9',d1 ; make sure between 0 and 9
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bhi .0001
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subi.b #'0',d1
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fscale.w #1,fp0 ; fract * 10.0
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addq #1,d6 ; record scaling
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fmove.b d1,fp1 ; fp1 = digit
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fadd fp1,fp0 ; fract += digit
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addq.w #1,d5 ; increment number of digits in number
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dbra d4,.0002
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.0001
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bsr _GetFloatBackupChar
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neg d6
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fscale.l d6,fp0 ; fract /= scale
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movem.l (sp),d1/d4/d6
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fmove.x 12(sp),fp1
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cchk 24(sp)
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unlk a2
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rts
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;-------------------------------------------------------------------------------
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; Get exponent part of a number, 4 digits max, into a float register.
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;
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; Register Usage:
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; d1 = digit from input screen
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; d2 = exponent
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; d3 = temp, number times 2
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; d4 = digit counter
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; Parameters:
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; fp0 = float number
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; Returns:
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; fp0 = float number with exponent factored in
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;-------------------------------------------------------------------------------
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_GetExponent:
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link a2,#-32
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move.l _canary,28(sp)
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movem.l d1/d2/d3/d4,(sp)
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fmove.x fp2,16(sp)
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clr.l d2 ; d2 = number = 0
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fmove.w #0,fp2 ; fp2 = exp = 0.0
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moveq #1,d3 ; d3 = exscale = 1
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bsr _GetFloatGetChar
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cmpi.b #'-',d1
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bne .0001
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neg.l d3 ; exscale = -1
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.0006
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bsr _GetFloatIgnBlanks
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bra .0002
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.0001
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cmpi.b #'+',d1
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beq .0006
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bsr _GetFloatBackupChar
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.0002
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moveq #3,d4 ; d4 = max 4 digits
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.0004
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bsr _GetFloatGetChar ; d1 = digit char
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cmpi.b #'0',d1
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blo .0003
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cmpi.b #'9',d1 ; ensure between 0 and 9
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bhi .0003
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subi.b #'0',d1
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add.l d2,d2 ; number *2
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move.l d2,d3
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lsl.l #2,d2 ; number *8
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add.l d3,d2 ; number *10
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ext.w d1
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ext.l d1
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add.l d1,d2 ; number + digit
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addq.w #1,d5 ; increment number of digits in number
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dbra d4,.0004
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.0003
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bsr _GetFloatBackupChar ; backup a character
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mulu d3,d2 ; *1 or *-1
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ext.l d2
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fscale.l d2,fp2 ; exp * exmul
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fmul fp2,fp0 ; rval *= exp
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movem.l (sp),d1/d2/d3/d4
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fmove.x 16(sp),fp2
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cchk 28(sp)
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unlk a2
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rts
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;-------------------------------------------------------------------------------
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; Get an integer number, positive or negative, 25 digits max, into a float
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; register.
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;
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; Register Usage:
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; d1 = digit from input screen
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; d2 = digit down counter
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; d3 = sign of number '+' or '-'
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; fp1 = digit
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; Modifies:
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; a0,fp0
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; Returns:
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; a0 = updated buffer pointer
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; fp0 = integer number
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;-------------------------------------------------------------------------------
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_GetInteger:
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link a2,#-28
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move.l _canary,24(sp)
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movem.l d1/d2/d3,(sp)
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fmove.x fp1,12(sp)
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fmove.w #0,fp0
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moveq #24,d2 ; d2 = digit count (25 max)
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bsr _GetFloatIgnBlanks
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bsr _GetFloatGetChar ; get the sign of the number
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cmpi.b #'+',d1
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beq .0002
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.0003
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cmpi.b #'-',d1
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bne .0004
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move.b #'-',d7
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.0002
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bsr _GetFloatGetChar
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.0004
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cmpi.b #'0',d1 ; only characters 0 to 9 valid
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blo .0001
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cmpi.b #'9',d1
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bhi .0001
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subi.b #'0',d1
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fscale.w #1,fp0 ; number *10
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fmove.b d1,fp1 ; fp1 = digit
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fadd fp1,fp0
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addq.w #1,d5
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dbra d2,.0002
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.0001
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bsr _GetFloatBackupChar
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movem.l (sp),d1/d2/d3
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fmove.x 12(sp),fp1
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cchk 24(sp)
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unlk a2
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rts
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;-------------------------------------------------------------------------------
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; Get a floating point number off the input screen.
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;
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; Parameters:
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; a0 = pointer to buffer containing string
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; d0 = stride of buffer (increment / decrement amount)
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; Register Usage:
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; d1 = character from input screen
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; d5.lo = number of digits in number, d5.hi = number of characters fetched
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; Returns:
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; fp0 = number
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; a0 = updated buffer pointer
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; d0 = length of number >0 if a number
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;-------------------------------------------------------------------------------
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_GetFloat:
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link a2,#-32
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move.l _canary,28(sp)
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movem.l d1/d5/d7/a1,(sp)
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fmove.x fp2,16(sp)
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clr.l d5
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move.b #'+',d7 ; assume a positive number
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move.l a0,a1 ; a1 = copy of pointer to buffer
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bsr _GetInteger ; rval = integer
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fmove.x fp0,fp2
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bsr _GetFloatGetChar
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cmpi.b #'.',d1
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beq .0004
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.0005
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bsr _GetFloatBackupChar
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bra .0002
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.0004
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bsr _GetFraction
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fadd fp2,fp0 ; rval += fraction
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bsr _GetFloatGetChar
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cmpi.b #'e',d1 ; accept either 'e' or 'E' indicating exponent
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beq .0001
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cmpi.b #'E',d1
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bne .0005
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.0001
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bsr _GetExponent ; factor exponent into fp0
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.0002
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cmpi.b #'-',d7 ; adjust number for sign
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bne .0003
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fneg fp0
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.0003
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suba.l a0,a1 ; compute number of characters fetched
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move.w a1,d0 ; move it to d0.hi
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swap d0
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move.w d5,d0 ; return digit/character count in d0 (non zero for a number)
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movem.l (sp),d1/d5/d7/a1
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fmove.x 16(sp),fp2
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cchk 28(sp)
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unlk a2
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rts
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