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annotate lib/alib/strncmp.as @ 3158:927ba5ebc06e

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mc09 l2: move MMU bit-field defines to defs file.
author Neal Crook <foofoobedoo@gmail.com>
date Thu, 06 Apr 2017 21:43:58 +0100
parents 03f26e88b809
children
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1 *************************************
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2
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3 * STRNCMP: compare 2 null terminated strings
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4 * maximum number of bytes to compare in D
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5 *
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6 * OTHER MODULES NEEDED: COMPARE
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7
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8 * ENTRY: X=start of 1st string
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9 * Y=start of 2nd string
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10 * D=number of bytes to compare
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11 * CASEMTCH:(a global variable in COMPARE)
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12 * 0=match for case
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13 * -1=ignore case differences
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14
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15 * EXIT: CC zero set if equal (beq)
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16 * carry + zero clear if 1>2 (bhi)
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17 * carry set if 1<2 (blo)
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18
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19 nam Compare 2 Strings
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20 ttl Assembler Library Module
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21
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22
2782
aaba193af04f Updated code to use lwasm/lwlink
Boisy Pitre <boisy.pitre@nuance.com>
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23 section .text
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25
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26 STRNCMP:
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27 pshs d,x,y,u
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28
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29 tfr y,u U=string2
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30 tfr d,y use Y for counter
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31 leay 1,y comp for initial dec.
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32
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33 loop
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34 leay -1,y count down
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35 beq exit no miss-matches
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36 lda ,x+ get 2 to compare
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37 ldb ,u+
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38 lbsr COMPARE go compare chars.
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39 beq loop chars match, do more
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40
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41 * exit with flags set. Do a beq, bhi or blo to correct
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42 * routines....
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43
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44 exit
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45 puls d,x,y,u,pc
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46
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47 endsect