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annotate lib/alib/strncpy.as @ 3054:22ddd48b4ec2

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level1 krn: Fix scheduler bug that only affected 6309 The original 6809 binary was correct, but it was disassembled and interpreted wrongly, so that reassembly went wrong on 6309.
author Tormod Volden <debian.tormod@gmail.com>
date Sun, 25 Jan 2015 22:36:02 +0100
parents 03f26e88b809
children
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1 **********************************
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2
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3 * STRNCPY: copy N bytes of a null terminated string
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4 * User must ensure there is room in buffer!!!
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5 * If N>string length only N bytes will be moved
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6
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7 * OTHER MODULES NEEDED: STRLEN, MEMMOVE
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8
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9 * ENTRY: X=start of string to move
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10 * Y=buffer for copy of string
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12 * EXIT: D = actual number of bytes moved
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13 * all other regs preserved (except cc)
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16 nam Copy partial String
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17 ttl Assembler Library Module
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aaba193af04f Updated code to use lwasm/lwlink
Boisy Pitre <boisy.pitre@nuance.com>
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20 section .text
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22 STRNCPY:
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23 pshs d bytes wanted to move
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24 lbsr STRLEN find length of string
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25 addd #1 move NULL also
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26 cmpd ,s get smaller of passed/actual size
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27 bls skip use actual leng
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28 ldd ,s use passed leng²²
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29 skip
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30 lbsr MEMMOVE move it
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31 leas 2,s
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32 rts
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34 endsect
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aaba193af04f Updated code to use lwasm/lwlink
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