1 /* File name comparison routine.
3 Copyright (C) 2007 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
27 #include "filenames.h"
28 #include "safe-ctype.h"
32 @deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2})
34 Return zero if the two file names @var{s1} and @var{s2} are equivalent.
35 If not equivalent, the returned value is similar to what @code{strcmp}
36 would return. In other words, it returns a negative value if @var{s1}
37 is less than @var{s2}, or a positive value if @var{s2} is greater than
40 This function does not normalize file names. As a result, this function
41 will treat filenames that are spelled differently as different even in
42 the case when the two filenames point to the same underlying file.
43 However, it does handle the fact that on DOS-like file systems, forward
44 and backward slashes are equal.
51 filename_cmp (const char *s1
, const char *s2
)
53 #if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \
54 && !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
55 return strcmp(s1
, s2
);
62 #if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
67 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
68 /* On DOS-based file systems, the '/' and the '\' are equivalent. */
89 @deftypefn Extension int filename_ncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n})
91 Return zero if the two file names @var{s1} and @var{s2} are equivalent
93 If not equivalent, the returned value is similar to what @code{strncmp}
94 would return. In other words, it returns a negative value if @var{s1}
95 is less than @var{s2}, or a positive value if @var{s2} is greater than
98 This function does not normalize file names. As a result, this function
99 will treat filenames that are spelled differently as different even in
100 the case when the two filenames point to the same underlying file.
101 However, it does handle the fact that on DOS-like file systems, forward
102 and backward slashes are equal.
109 filename_ncmp (const char *s1
, const char *s2
, size_t n
)
111 #if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \
112 && !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
113 return strncmp(s1
, s2
, n
);
122 #if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM)
127 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
128 /* On DOS-based file systems, the '/' and the '\' are equivalent. */
135 if (c1
== '\0' || c1
!= c2
)
147 @deftypefn Extension hashval_t filename_hash (const void *@var{s})
149 Return the hash value for file name @var{s} that will be compared
151 This function is for use with hashtab.c hash tables.
158 filename_hash (const void *s
)
160 /* The cast is for -Wc++-compat. */
161 const unsigned char *str
= (const unsigned char *) s
;
165 while ((c
= *str
++) != 0)
170 r
= r
* 67 + c
- 113;
178 @deftypefn Extension int filename_eq (const void *@var{s1}, const void *@var{s2})
180 Return non-zero if file names @var{s1} and @var{s2} are equivalent.
181 This function is for use with hashtab.c hash tables.
188 filename_eq (const void *s1
, const void *s2
)
190 /* The casts are for -Wc++-compat. */
191 return filename_cmp ((const char *) s1
, (const char *) s2
) == 0;
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