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annotate lib/alib/bin_dec.a @ 2765:0bd16cca86b7

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Updated rules.mak for all the os9 format's to format the entire disk. People were having some issues with the disk images not being formatted to their full capacity and preventing some functions from working.
author drencor-xeen
date Thu, 17 Jan 2013 11:03:26 -0600
parents 7d70b7e1cb21
children aaba193af04f
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1 ************************************************
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2 *
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3 * Binary to decimal conversion
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4
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5 * OTHER MODULES NEEDED: DECTAB$
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6
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7 * ENTRY: X=buffer for ascii string
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8 * D=binary value to convert
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9
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10 * EXIT: all registers (except cc) preserved
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11
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12 * BGP - 04/11/2009 - Fixed issue where BIN_DEC was printing negative
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13 * sign in certain cases. Cleared nega flag to fix issue.
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14
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15 nam Binary to Decimal Conversion
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16 ttl Assembler Library Module
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17
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18
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19 psect BIN_DEC,0,0,0,0,0
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20
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21 vsect
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22 nega rmb 1
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23 endsect
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24
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25 BIN_SDEC:
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26 clr nega,u
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27 tsta
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28 bpl BIN_DEC
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29 sta nega,u
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30 comb
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31 coma
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32 addd #$0001
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33 bra BIN_DEC_COMMON +++ added BGP
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34
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35 BIN_DEC:
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36 clr nega,u +++ added BGP
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37 BIN_DEC_COMMON
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38 pshs a,b,x,y
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39 lda #7 clear out 7 bytes in buffer
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40
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41 bindc1
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42 clr ,x+
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43 deca
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44 bne bindc1
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45 ldx 2,s restore buffer start address
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46 ldd ,s get data
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47 bne bindc2 not 0, do convert
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48 lda #'0
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49 sta ,x
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50 bra bindc8 exit
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51
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52 bindc2
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53 tst nega,u
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54 beq bindc25
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55 pshs a
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56 lda #'-
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57 sta ,x+
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58 puls a
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59 bindc25
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60 leay DECTAB$,pcr point to conversion table
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61 clr ,--s temps, flag 1st dgt not placed
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62
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63 bindc3
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64 clr 1,s current digit=0
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65
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66 bindc4
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67 subd ,y sub table element
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68 bcs bindc5 too far, correct
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69 inc 1,s bump digit
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70 bra bindc4 loop til done
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71
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72 bindc5
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73 addd ,y restore, 1 too many subtracts
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74 pshs a,b save rest of number
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75 lda 3,s get the digit
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76 adda #$30 make it ascii
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77 cmpa #'0 is it zero?
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78 bne bindc6 no, skip
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79 tst 2,s is it 1st digit in string?
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80 beq bindc7 yes, don't do leading 0s
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81
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82 bindc6
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83 inc 2,s indidicate at least 1 digit
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84 sta ,x+ save in buffer
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85
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86 bindc7
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87 leay 2,y next table entry
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88 tst 1,y end of table
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89 puls a,b restore data
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90 bne bindc3 no..loop
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91 leas 2,s
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92
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93 bindc8
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94 puls a,b,x,y,pc restore and return
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95
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96 endsect
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97