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55 lines
1.7 KiB
PHP
55 lines
1.7 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 1999-2000 by the Free Pascal development team
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Processor specific implementation of strpas
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{
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r3: result address
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r4: src
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}
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asm
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{ nil? }
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cmplwi r4, 0
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{ load the begin of the string in the data cache }
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dcbt 0,r4
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{ maxlength }
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li r10,255
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mtctr r10
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{ at LStrPasDone, we set the length of the result to 255 - r10 - r4 }
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{ = 255 - 255 - 0 if the soure = nil -> perfect :) }
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beq .LStrPasDone
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{ save address for at the end and use r5 in loop }
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mr r5,r3
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{ no "subi r5,r5,1" because the first byte = length byte }
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subi r4,r4,1
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.LStrPasLoop:
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lbzu r10,1(r4)
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cmplwi cr0,r10,0
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stbu r10,1(r5)
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bdnzf cr0*4+eq, .LStrPasLoop
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{ if we stopped because of a terminating #0, decrease the length by 1 }
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cntlzw r4,r10
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{ get remaining count for length }
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mfctr r10
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{ if r10 was zero (-> stopped because of zero byte), then r4 will be 32 }
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{ (32 leading zero bits) -> shr 5 = 1, otherwise this will be zero }
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srwi r4,r4,5
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.LStrPasDone:
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subfic r10,r10,255
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sub r10,r10,r4
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{ store length }
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stb r10,0(r3)
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end;
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