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#define LENGTH_LIMIT |
/* strncasecmp.c -- case insensitive string comparator |
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#include "strcasecmp.c" |
Copyright (C) 1998, 1999, 2005 Free Software Foundation, Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2, or (at your option) |
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any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software Foundation, |
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
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#ifdef HAVE_CONFIG_H |
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# include <config.h> |
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#endif |
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/* Specification. */ |
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#include "strcase.h" |
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#include <ctype.h> |
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#include <limits.h> |
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#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch)) |
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/* Compare no more than N bytes of strings S1 and S2, |
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ignoring case, returning less than, equal to or |
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greater than zero if S1 is lexicographically less |
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than, equal to or greater than S2. */ |
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int |
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strncasecmp (const char *s1, const char *s2, size_t n) |
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{ |
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register const unsigned char *p1 = (const unsigned char *) s1; |
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register const unsigned char *p2 = (const unsigned char *) s2; |
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unsigned char c1, c2; |
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if (p1 == p2 || n == 0) |
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return 0; |
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do |
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{ |
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c1 = TOLOWER (*p1); |
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c2 = TOLOWER (*p2); |
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if (--n == 0 || c1 == '\0') |
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break; |
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++p1; |
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++p2; |
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} |
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while (c1 == c2); |
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if (UCHAR_MAX <= INT_MAX) |
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return c1 - c2; |
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else |
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/* On machines where 'char' and 'int' are types of the same size, the |
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difference of two 'unsigned char' values - including the sign bit - |
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doesn't fit in an 'int'. */ |
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return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0); |
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} |