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Rev | Author | Line No. | Line |
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1408 | serge | 1 | # _strncat() Author: Kees J. Bot |
2 | # 1 Jan 1994 |
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3 | # char *_strncat(char *s1, const char *s2, size_t edx) |
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4 | # Append string s2 to s1. |
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5 | # |
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6 | |||
7 | .intel_syntax |
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8 | |||
9 | .global __strncat |
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10 | |||
11 | .text |
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12 | .align 16 |
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13 | __strncat: |
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14 | push ebp |
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15 | mov ebp, esp |
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16 | push esi |
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17 | push edi |
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18 | mov edi, [ebp+8] # String s1 |
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19 | mov ecx, -1 |
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20 | xorb al, al # Null byte |
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21 | cld |
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22 | repne |
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23 | scasb # Look for the zero byte in s1 |
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24 | dec edi # Back one up (and clear 'Z' flag) |
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25 | push edi # Save end of s1 |
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26 | mov edi, [12+ebp] # edi = string s2 |
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27 | mov ecx, edx # Maximum count |
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28 | repne |
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29 | scasb # Look for the end of s2 |
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30 | jne no0 |
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31 | inc ecx # Exclude null byte |
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32 | no0: sub edx, ecx # Number of bytes in s2 |
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33 | mov ecx, edx |
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34 | mov esi, [12+ebp] # esi = string s2 |
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35 | pop edi # edi = end of string s1 |
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36 | rep |
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37 | movsb # Copy bytes |
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38 | stosb # Add a terminating null |
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39 | mov eax, [8+ebp] # Return s1 |
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40 | pop edi |
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41 | pop esi |
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42 | pop ebp |
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43 | ret |