49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
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/* strncase.c -- compare at most N characters of two strings without
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taking care for the case
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Copyright (C) 1992 Free Software Foundation.
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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
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <string.h>
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#include <ctype.h>
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/* Compare no more than N characters of 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 (s1, s2, n)
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const char *s1;
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const char *s2;
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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 (c1 == '\0' || c1 != c2)
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return c1 - c2;
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} while (--n > 0);
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return c1 - c2;
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}
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