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Rev | Author | Line No. | Line |
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1698 | IgorA | 1 | ; strlen function |
2 | ; |
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3 | ; Copyright (c) 2003 Thomas Mathys |
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4 | ; killer@vantage.ch |
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5 | ; |
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6 | ; This program is free software; you can redistribute it and/or modify |
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7 | ; it under the terms of the GNU General Public License as published by |
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8 | ; the Free Software Foundation; either version 2 of the License, or |
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9 | ; (at your option) any later version. |
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10 | ; |
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11 | ; This program is distributed in the hope that it will be useful, |
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12 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | ; GNU General Public License for more details. |
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15 | ; |
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16 | ; You should have received a copy of the GNU General Public License |
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17 | ; along with this program; if not, write to the Free Software |
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18 | ; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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19 | ; |
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20 | ;%ifndef _STRLEN_INC |
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21 | ;%define _STRLEN_INC |
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22 | |||
23 | |||
24 | ;******************************************************************** |
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25 | ; returns the length of an asciiz string |
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26 | ; input : esi = pointer to string |
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27 | ; output : eax = string length |
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28 | ; destroys : nothing |
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29 | ;******************************************************************** |
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30 | strlen: |
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31 | push ecx |
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32 | push edi |
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33 | pushfd |
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34 | cld ; ! |
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35 | mov ecx,-1 |
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36 | mov edi,esi ; find terminating zero |
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37 | xor al,al |
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38 | repne scasb |
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39 | mov eax,edi ; calculate string length |
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40 | sub eax,esi |
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41 | dec eax |
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42 | popfd |
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43 | pop edi |
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44 | pop ecx |
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45 | ret |