+
−/* Case-insensitive string comparison function.
+
−   Copyright (C) 1998-1999, 2005-2007, 2009-2011 Free Software Foundation, Inc.
+
−
+
−   This program is free software; you can redistribute it and/or modify
+
−   it under the terms of the GNU General Public License as published by
+
−   the Free Software Foundation; either version 2, or (at your option)
+
−   any later version.
+
−
+
−   This program is distributed in the hope that it will be useful,
+
−   but WITHOUT ANY WARRANTY; without even the implied warranty of
+
−   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+
−   GNU General Public License for more details.
+
−
+
−   You should have received a copy of the GNU General Public License
+
−   along with this program; if not, write to the Free Software Foundation,
+
−   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
−
+
−#include <config.h>
+
−
+
−/* Specification.  */
+
−#include <string.h>
+
−
+
−#include <ctype.h>
+
−#include <limits.h>
+
−
+
−#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
+
−
+
−/* Compare strings S1 and S2, ignoring case, returning less than, equal to or
+
−   greater than zero if S1 is lexicographically less than, equal to or greater
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−   than S2.
+
−   Note: This function does not work with multibyte strings!  */
+
−
+
−int
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−strcasecmp (const char *s1, const char *s2)
+
−{
+
−  const unsigned char *p1 = (const unsigned char *) s1;
+
−  const unsigned char *p2 = (const unsigned char *) s2;
+
−  unsigned char c1, c2;
+
−
+
−  if (p1 == p2)
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−    return 0;
+
−
+
−  do
+
−    {
+
−      c1 = TOLOWER (*p1);
+
−      c2 = TOLOWER (*p2);
+
−
+
−      if (c1 == '\0')
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−        break;
+
−
+
−      ++p1;
+
−      ++p2;
+
−    }
+
−  while (c1 == c2);
+
−
+
−  if (UCHAR_MAX <= INT_MAX)
+
−    return c1 - c2;
+
−  else
+
−    /* 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'.  */
+
−    return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
+
−}