DOS/Windows-related changes in the include subdirectory

[Eli Zaretskii <eliz@gnu.org>]

This adds a new file with several macros for platform-independent
handling of file names.

1999-07-08  Eli Zaretskii  <eliz@is.elta.co.il>

	* filenames.h: New file.
	(DOSISH_FILENAMES, MONOCASE_FILENAMES, FILENAME_CMP): New macros.

*** /dev/null	Sat Jul 31 17:57:06 1999
--- include/filename.h	Tue Jul 27 19:15:42 1999
***************
*** 0 ****
--- 1,23 ----
+ /* Macros for taking apart, interpreting and processing file names.
+ 
+    These are here because some non-Posix (a.k.a. DOSish) systems have
+    the drive letter brain-damage at the beginning of an absolute file
+    name, use forward- and back-slash in path names interchangeably, and
+    some of them have case-insensitive file names.  */
+ 
+ #if defined(__MSDOS__) || defined(_WIN32)
+ #define IS_SLASH(c)	((c) == '/' || (c) == '\\')
+ #define IS_ABSOLUTE(f)	(IS_SLASH((f)[0]) || (f)[0] && (f)[1] == ':')
+ #define DOSISH_FILENAMES 1
+ #define MONOCASE_FILENAMES 1
+ #else
+ #define IS_SLASH(c)	((c) == '/')
+ #define IS_ABSOLUTE(f)	(IS_SLASH((f)[0]))
+ #define MONOCASE_FILENAMES 0
+ #endif
+ 
+ #if MONOCASE_FILENAMES
+ #define FILENAME_CMP(s1, s2)  strcasecmp(s1, s2)
+ #else
+ #define FILENAME_CMP(s1, s2)  strcmp(s1, s2)
+ #endif