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1 /* Copyright (C) 1992 Free Software Foundation, Inc. |
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2 This file is part of the GNU C Library. |
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3 |
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4 The GNU C Library is free software; you can redistribute it and/or |
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5 modify it under the terms of the GNU General Public License as |
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6 published by the Free Software Foundation; either version 2 of the |
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7 License, or (at your option) any later version. |
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8 |
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9 The GNU C Library is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public |
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15 License along with the GNU C Library; see the file COPYING. If |
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16 not, write to the Free Software Foundation, Inc., 51 Franklin Street, |
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17 Fifth Floor, Boston, MA 02110-1301, USA. */ |
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18 |
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19 #ifdef HAVE_CONFIG_H |
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20 #include <config.h> |
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21 #endif |
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22 |
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23 #ifndef HAVE_STRNCASECMP |
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24 |
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25 #include <ctype.h> |
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26 #include <string.h> |
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27 |
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28 /* Compare no more than N characters of S1 and S2, |
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29 ignoring case, returning less than, equal to or |
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30 greater than zero if S1 is lexicographically less |
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31 than, equal to or greater than S2. */ |
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32 int |
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33 strncasecmp (const char *s1, const char *s2, size_t n) |
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34 { |
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35 register const unsigned char *p1 = (const unsigned char *) s1; |
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36 register const unsigned char *p2 = (const unsigned char *) s2; |
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37 unsigned char c1, c2; |
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38 |
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39 if (p1 == p2 || n == 0) |
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40 return 0; |
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41 |
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42 do |
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43 { |
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44 c1 = tolower (*p1++); |
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45 c2 = tolower (*p2++); |
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46 if (c1 == '\0' || c1 != c2) |
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47 return c1 - c2; |
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48 } while (--n > 0); |
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49 |
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50 return c1 - c2; |
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51 } |
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52 |
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53 #endif |
