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https://github.com/dschmenk/PLASMA.git
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Much better floating point string conversion
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1713c71505
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@ -6,6 +6,7 @@ const FPSTR_FIXED = 1 // Fixed count of fractional digits
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const FPSTR_FLOAT = 0 // Floating count of fractional digits
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const FPSTR_STRIP = 2 // Strip trailing fractional zeros
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const FPSTR_EXP = 4 // Force exponential format
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const FPSTR_FLEX = 8 // Flexible switch to EXP format if over/underflow
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//
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// Parse string into decrecord, return SANE conversion output
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//
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@ -3,6 +3,7 @@
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//
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include "inc/cmdsys.plh"
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include "inc/sane.plh"
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include "inc/fpstr.plh"
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//
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// Structures for DEC2BIN, BIN2DEC
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//
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@ -136,14 +137,15 @@ end
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// Convert extended FP to string using , return string
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//
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export def ext2str(ext, str, intdigits, fracdigits, format)
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byte d, i, sigdigits, numdigits
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word dp, tens
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byte d, numdigits
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word istr, dp, tens
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byte decform[t_decformat]
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byte decrec[t_decrecord]
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numdigits = intdigits + fracdigits
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decform:style = format & $01
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numdigits = intdigits + fracdigits
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decform:style = format & FPSTR_FIXED
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decform:digits = decform:style ?? fracdigits :: numdigits
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decrec:exp = 0
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sane:saveZP()
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sane:restoreZP(sane:op3FP(FFEXT|FOB2D, @decrec, ext, @decform))
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^(str+1) = decrec.sgn ?? '-' :: ' '
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@ -162,94 +164,109 @@ export def ext2str(ext, str, intdigits, fracdigits, format)
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return str
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fin
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dp = decrec.sig + decrec:exp
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if decrec.sig.1 == '0'
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//
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// Zero with significant fractional digits
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//
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while decrec.sig <= fracdigits
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decrec.sig++
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decrec.sig[decrec.sig] = '0'
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loop
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decrec:exp = 0
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dp = 1
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fin
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sigdigits = decrec.sig
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if decrec:exp < 0 and format & $02
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//
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// Strip off trailing fractional zeros
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//
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while sigdigits > dp and decrec.sig[sigdigits] == '0'
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sigdigits--
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decrec:exp++
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loop
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fin
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if -decrec:exp > numdigits or sigdigits + decrec:exp >= (decform:style ?? intdigits :: numdigits) or format & $04
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//
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// Convert to exponential format
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//
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^(str+2) = decrec.sig.1
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^(str+3) = '.'
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i = 3
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fracdigits = fracdigits - 5 // Replace last four fracdigits with exponent notation
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for d = 0 to fracdigits
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i++
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^(str+i) = decrec.sig.2[d]
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next
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if format & FPSTR_EXP
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if format & FPSTR_STRIP
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//
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// Strip off trailing fractional zeros
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//
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while decrec.sig > 1 and decrec.sig[decrec.sig] == '0'
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decrec.sig--
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decrec:exp++
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loop
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fin
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//
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// Copy over all significant digits
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//
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if ^(str+i) == '.'; i--; fin
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i++
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^(str+i) = 'E'
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i++
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^(str+2) = decrec.sig.1
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^(str+3) = '.'
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istr = str + 3
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for d = 2 to decrec.sig
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istr++
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^istr = decrec.sig[d]
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next
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if ^istr == '.'; istr--; fin
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//
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// Print exponent as 4 digits with leading zeros
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//
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istr++
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^istr = 'E'
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istr++
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dp--
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if dp < 0
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^(str+i) = '-'
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^istr = '-'
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dp = -dp
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else
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^(str+i) = '+'
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fin
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//
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// Pretty output the exponent (preceding zero for values less than 10)
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//
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if dp < 100
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tens = 10
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else
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tens = 10000
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while !(dp / tens)
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tens = tens / 10
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loop
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^istr = '+'
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fin
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tens = 1000
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while tens
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i++
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^(str+i) = (dp / tens) + '0'
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istr++
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^istr = (dp / tens) + '0'
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dp = dp % tens
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tens = tens / 10
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loop
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else
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if format & FPSTR_STRIP and decrec:exp < 0
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//
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// Strip off trailing fractional zeros
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//
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while decrec.sig > dp and decrec.sig[decrec.sig] == '0'
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decrec.sig--
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decrec:exp++
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loop
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fin
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if decrec:sig == 1 | '0'<<8
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//
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// Case of zero or underflow
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//
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if decrec:exp == 0
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//
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// Zero
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//
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if format & FPSTR_FIXED
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//
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// Add trailing fractional zeros
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//
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dp = 1 - fracdigits
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fin
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elsif format & FPSTR_FLEX
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//
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// Underflow
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//
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dp = -fracdigits
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fin
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fin
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if format & FPSTR_FLEX and (dp <= -fracdigits or dp >= (format & FPSTR_FIXED ?? intdigits :: numdigits))
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//
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// Print as exponent if over/underflow fixed digits
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//
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if numdigits < 8; numdigits = 8; fin
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return ext2str(ext, str, 1, numdigits - 8, FPSTR_EXP | (format & FPSTR_STRIP))
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fin
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//
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// Convert as floating point
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//
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i = 1
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if dp <= 0
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*(str+2) = '0'|('.'<<8)
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i = 3
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istr = str + 3
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while dp < 0
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dp++
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i++
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^(str+i) = '0'
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istr++
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^istr = '0'
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loop
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else
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istr = str + 1
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fin
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for d = 1 to sigdigits
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i++
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^(str+i) = decrec.sig[d]
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for d = 1 to decrec.sig
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istr++
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^istr = decrec.sig[d]
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if d == dp
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i++
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^(str+i) = '.'
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istr++
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^istr = '.'
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fin
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next
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if ^(str+i) == '.'; i--; fin
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if ^istr == '.'; istr--; fin
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fin
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^str = i
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^str = istr - str
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return str
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end
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@ -37,7 +37,7 @@ byte inputStr[32] = ""
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// Display format state
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//
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byte displayFix = 6
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byte displayInt = displayWidth - 7 // - displayFix - 1
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byte displayInt = displayWidth - 8
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//
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// Store/load memory
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//
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@ -81,8 +81,6 @@ byte[t_keypad] = '0', 3, 16, "[0]"
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word = @digitKey
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byte[t_keypad] = '.', 7, 16, "[.]"
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word = @pointKey
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byte[t_keypad] = 'E', 3, 16, "[0]"
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word = @digitKey
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byte[t_keypad] = 'X', 11, 16, "[X]"
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word = @dropKey
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byte[t_keypad] = '+', 15, 16, "[+]"
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@ -109,7 +107,7 @@ byte[t_keypad] = '^', 30, 14, "[X(^)Y]"
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word = @elemsKey
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byte[t_keypad] = 'L', 30, 16, "[(L)G2]"
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word = @elemsKey
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byte[t_keypad] = 'E', 30, 18, "[(P)^X]"
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byte[t_keypad] = 'E', 30, 18, "[(E)^X]"
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word = @elemsKey
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byte[t_keypad] = 'N', 30, 20, "[L(N)X]"
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word = @elemsKey
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@ -154,7 +152,7 @@ def showStack#0
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byte strFP[displayWidth+1]
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for s = 0 to 3
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fpu:storStr(@strFP, displayInt, displayFix, FPSTR_FIXED, s)
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fpu:storStr(@strFP, displayInt, displayFix, FPSTR_FIXED|FPSTR_FLEX, s)
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conio:gotoxy(4, 5 - s)
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repc(displayWidth - strFP - 1, ' ')
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puts(@strFP)
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@ -165,7 +163,7 @@ def showMem#0
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byte strFP[displayWidth+1]
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for m = 0 to 9
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ext2str(@memory[m*t_fpureg], @strFP, displayInt, displayFix, FPSTR_FIXED)
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ext2str(@memory[m*t_fpureg], @strFP, displayInt, displayFix, FPSTR_FIXED|FPSTR_FLEX)
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conio:gotoxy(23, 2 + m)
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repc(displayWidth - strFP - 1, ' ')
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puts(@strFP)
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@ -254,7 +252,7 @@ def delKey(pkey)#0
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showInput
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end
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def dropKey(pkey)#0
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fpu:pullStr(@inputStr, displayInt, displayFix, FPSTR_STRIP|FPSTR_FLOAT)
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fpu:pullStr(@inputStr, displayInt, displayFix, FPSTR_STRIP|FPSTR_FLOAT|FPSTR_FLEX)
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if inputStr.1 == ' '
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inputStr--
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memcpy(@inputStr.1, @inputStr.2, inputStr)
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@ -263,7 +261,7 @@ def dropKey(pkey)#0
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showStack
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end
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def copyKey(pkey)#0
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fpu:storStr(@inputStr, displayInt, displayFix, FPSTR_STRIP|FPSTR_FLOAT, X_REG)
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fpu:storStr(@inputStr, displayInt, displayFix, FPSTR_STRIP|FPSTR_FLOAT|FPSTR_FLEX, X_REG)
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if inputStr.1 == ' '
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inputStr--
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memcpy(@inputStr.1, @inputStr.2, inputStr)
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@ -452,7 +450,7 @@ initInput
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showStack
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showMem
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showInput
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showStatus("Version 0.6")
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showStatus("Version 0.7")
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inputKey
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conio:gotoxy(0, 22)
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done
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