[patch libiberty include]: Add additional helper functions for directory-separator searching

[Kai Tietz <ktietz70 at googlemail dot com>]

Hello,

This patch introduce directory-separator search routines to libiberty.
IMHO filename_cmp.c is suiteable for those functions, but if there are
objections about that I can move it into a separate source-file. It
helps to avoid a commonly used pattern about dir-separator searching
in code, which requires #if-conditions to check if DOS paths are used
and introduces additional internal variables.

the pattern

         const char *filename = strrchr (xloc.file, '/');
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
         const char *filename2 = strrchr (xloc.file, '\\');

         if (!filename || (filename2 && filename2 > filename))
           filename = filename2;

can be written by this patch as
        const char *filename = filename_dirrchr (xloc.file);


ChangeLog include/

2011-03-08  Kai Tietz

	* filenames.h (filename_dirchr): New prototype.
	(filename_dirrchr): Likewise.

ChangeLog libiberty/

2011-03-08  Kai Tietz

	* filename_cmp.c (filename_dirchr): New function.
	(filename_dirrchr): Likewise.
	* functions.texi: Regenerated.


Tested for x86_64-pc-linux-gnu and x86_64-w64-mingw32. Ok for apply?

Regards,
Kai

Attachment: libiberty_dirsep.txt
Description: Text document