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[9] | 1 | ! _strncat() Author: Kees J. Bot
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| 2 | ! 27 Jan 1994
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| 3 | .sect .text; .sect .rom; .sect .data; .sect .bss
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| 4 |
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| 5 | ! char *_strncat(char *s1, const char *s2, size_t dx)
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| 6 | ! Append string s2 to s1.
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| 7 | !
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| 8 | .sect .text
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| 9 | .define __strncat
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| 10 | __strncat:
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| 11 | push bp
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| 12 | mov bp, sp
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| 13 | push si
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| 14 | push di
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| 15 | mov di, 4(bp) ! String s1
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| 16 | mov cx, #-1
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| 17 | xorb al, al ! Null byte
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| 18 | cld
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| 19 | repne scasb ! Look for the zero byte in s1
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| 20 | dec di ! Back one up (and clear 'Z' flag)
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| 21 | push di ! Save end of s1
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| 22 | mov di, 6(bp) ! di = string s2
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| 23 | mov cx, dx ! Maximum count
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| 24 | repne scasb ! Look for the end of s2
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| 25 | jne no0
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| 26 | inc cx ! Exclude null byte
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| 27 | no0: sub dx, cx ! Number of bytes in s2
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| 28 | mov cx, dx
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| 29 | mov si, 6(bp) ! si = string s2
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| 30 | pop di ! di = end of string s1
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| 31 | rep movsb ! Copy bytes
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| 32 | stosb ! Add a terminating null
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| 33 | mov ax, 4(bp) ! Return s1
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| 34 | pop di
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| 35 | pop si
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| 36 | pop bp
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| 37 | ret
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