36 lines
736 B
ArmAsm
36 lines
736 B
ArmAsm
! strrchr() Author: Kees J. Bot
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! 2 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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.align 16
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_strrchr:
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push ebp
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mov ebp, esp
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push edi
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mov edi, 8(ebp) ! edi = string
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mov ecx, -1
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xorb al, al
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cld
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repne
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scasb ! Look for the end of the string
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not ecx ! -1 - ecx = Length of the string + null
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dec edi ! Put edi back on the zero byte
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movb al, 12(ebp) ! The character to look for
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std ! Downwards search
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repne
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scasb
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cld ! Direction bit back to default
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jne failure
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lea eax, 1(edi) ! Found it
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pop edi
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pop ebp
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ret
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failure:xor eax, eax ! Not there
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pop edi
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pop ebp
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ret
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