22 lines
537 B
ArmAsm
22 lines
537 B
ArmAsm
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! _strncpy() 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 *_strncpy(char *s1, const char *s2, size_t cx)
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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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__strncpy:
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mov di, 6(bp) ! di = string s2
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xorb al, al ! Look for a zero byte
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mov dx, cx ! Save maximum count
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cld
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repne scasb ! Look for end of s2
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sub dx, cx ! Number of bytes in s2 including null
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xchg cx, dx
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mov si, 6(bp) ! si = string s2
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mov di, 4(bp) ! di = string s1
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rep movsb ! Copy bytes
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ret
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