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Rev | Author | Line No. | Line |
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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 |