144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/* File name comparison routine.
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Copyright (C) 2007 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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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "filenames.h"
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#include "safe-ctype.h"
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/*
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@deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2})
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Return zero if the two file names @var{s1} and @var{s2} are equivalent.
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If not equivalent, the returned value is similar to what @code{strcmp}
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would return. In other words, it returns a negative value if @var{s1}
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is less than @var{s2}, or a positive value if @var{s2} is greater than
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@var{s2}.
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This function does not normalize file names. As a result, this function
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will treat filenames that are spelled differently as different even in
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the case when the two filenames point to the same underlying file.
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However, it does handle the fact that on DOS-like file systems, forward
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and backward slashes are equal.
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@end deftypefn
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*/
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int
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filename_cmp (const char *s1, const char *s2)
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{
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#if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \
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&& !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
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return strcmp(s1, s2);
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#else
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for (;;)
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{
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int c1 = *s1;
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int c2 = *s2;
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#if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
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c1 = TOLOWER (c1);
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c2 = TOLOWER (c2);
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#endif
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#if defined (HAVE_DOS_BASED_FILE_SYSTEM)
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/* On DOS-based file systems, the '/' and the '\' are equivalent. */
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if (c1 == '/')
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c1 = '\\';
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if (c2 == '/')
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c2 = '\\';
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#endif
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if (c1 != c2)
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return (c1 - c2);
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if (c1 == '\0')
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return 0;
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s1++;
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s2++;
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}
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#endif
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}
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/*
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@deftypefn Extension int filename_ncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n})
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Return zero if the two file names @var{s1} and @var{s2} are equivalent
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in range @var{n}.
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If not equivalent, the returned value is similar to what @code{strncmp}
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would return. In other words, it returns a negative value if @var{s1}
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is less than @var{s2}, or a positive value if @var{s2} is greater than
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@var{s2}.
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This function does not normalize file names. As a result, this function
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will treat filenames that are spelled differently as different even in
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the case when the two filenames point to the same underlying file.
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However, it does handle the fact that on DOS-like file systems, forward
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and backward slashes are equal.
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@end deftypefn
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*/
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int
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filename_ncmp (const char *s1, const char *s2, size_t n)
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{
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#if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \
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&& !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
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return strncmp(s1, s2, n);
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#else
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if (!n)
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return 0;
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for (; n > 0; --n)
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{
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int c1 = *s1;
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int c2 = *s2;
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#if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
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c1 = TOLOWER (c1);
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c2 = TOLOWER (c2);
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#endif
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#if defined (HAVE_DOS_BASED_FILE_SYSTEM)
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/* On DOS-based file systems, the '/' and the '\' are equivalent. */
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if (c1 == '/')
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c1 = '\\';
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if (c2 == '/')
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c2 = '\\';
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#endif
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if (c1 == '\0' || c1 != c2)
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return (c1 - c2);
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s1++;
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s2++;
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}
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return 0;
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#endif
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}
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