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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1627 | serge | 1 | /* _strncat() Author: Kees J. Bot */ |
| 2 | /* 1 Jan 1994 */ |
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| 3 | |||
| 4 | /* char *_strncat(char *s1, const char *s2, size_t edx) */ |
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| 5 | /* Append string s2 to s1. */ |
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| 6 | /* */ |
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| 7 | #include "asm.h" |
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| 8 | |||
| 9 | ENTRY(_strncat) |
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| 10 | push %ebp |
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| 11 | movl %esp, %ebp |
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| 12 | push %esi |
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| 13 | push %edi |
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| 14 | movl 8(%ebp), %edi /* String s1 */ |
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| 15 | movl $-1, %ecx |
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| 16 | xorb %al, %al /* Null byte */ |
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| 17 | cld |
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| 18 | |||
| 19 | repne scasb /* Look for the zero byte in s1 */ |
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| 20 | decl %edi /* Back one up (and clear 'Z' flag) */ |
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| 21 | push %edi /* Save end of s1 */ |
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| 22 | movl 12(%ebp), %edi /* edi = string s2 */ |
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| 23 | movl %edx, %ecx /* Maximum count */ |
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| 24 | |||
| 25 | repne scasb /* Look for the end of s2 */ |
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| 26 | jne no0 |
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| 27 | incl %ecx /* Exclude null byte */ |
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| 28 | no0: |
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| 29 | subl %ecx, %edx /* Number of bytes in s2 */ |
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| 30 | movl %edx, %ecx |
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| 31 | movl 12(%ebp), %esi /* esi = string s2 */ |
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| 32 | pop %edi /* edi = end of string s1 */ |
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| 33 | |||
| 34 | rep movsb /* Copy bytes */ |
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| 35 | stosb /* Add a terminating null */ |
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| 36 | movl 8(%ebp), %eax /* Return s1 */ |
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| 37 | pop %edi |
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| 38 | pop %esi |
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| 39 | pop %ebp |
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| 40 | ret |