34 lines
706 B
ArmAsm
Executable file
34 lines
706 B
ArmAsm
Executable file
! strrchr() Author: Kees J. Bot
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! 27 Jan 1994
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.sect .text; .sect .rom; .sect .data; .sect .bss
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! char *strrchr(const char *s, int c)
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! Look for the last occurrence a character in a string.
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!
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.sect .text
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.define _strrchr
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_strrchr:
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push bp
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mov bp, sp
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push di
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mov di, 4(bp) ! di = string
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mov cx, #-1
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xorb al, al
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cld
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repne scasb ! Look for the end of the string
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not cx ! -1 - cx = Length of the string + null
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dec di ! Put di back on the zero byte
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movb al, 6(bp) ! The character to look for
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std ! Downwards search
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repne scasb
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cld ! Direction bit back to default
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jne failure
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lea ax, 1(di) ! Found it
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pop di
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pop bp
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ret
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failure:xor ax, ax ! Not there
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pop di
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pop bp
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ret
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