25 lines
561 B
ArmAsm
25 lines
561 B
ArmAsm
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! _strncpy() Author: Kees J. Bot
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! 1 Jan 1994
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.sect .text; .sect .rom; .sect .data; .sect .bss
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! char *_strncpy(char *s1, const char *s2, size_t ecx)
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! Copy string s2 to s1.
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!
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.sect .text
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.define __strncpy
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.align 16
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__strncpy:
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mov edi, 12(ebp) ! edi = string s2
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xorb al, al ! Look for a zero byte
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mov edx, ecx ! Save maximum count
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cld
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repne
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scasb ! Look for end of s2
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sub edx, ecx ! Number of bytes in s2 including null
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xchg ecx, edx
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mov esi, 12(ebp) ! esi = string s2
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mov edi, 8(ebp) ! edi = string s1
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rep
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movsb ! Copy bytes
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ret
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