Fix 2017893: long file names not working on DOS. Crawl now takes a

shot at abbreviating them, and only fails if it can't find that file 
either.
Handles all files included by default in /settings and /docs except
changes.stone_soup which is not strictly necessary for the version
information.
Tested artificially by manually mutilating the file names; not 
actually tested on DOS.


git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/branches/stone_soup-0.4@6578 c06c8d41-db1a-0410-9941-cceddc491573

1 files changed, 24 insertions, 0 deletions

diff --git a/crawl-ref/source/files.cc b/crawl-ref/source/files.cc
index 4e9a019817..2dbce76869 100644
--- a/crawl-ref/source/files.cc
+++ b/crawl-ref/source/files.cc
@@ -213,6 +213,30 @@ static inline bool _is_good_filename(const std::string &s)
     return (s != "." && s != "..");
 }
 
+#if defined(DOS)
+// Abbreviates a given file name to DOS style "xxxxxx~1.txt".
+// Does not take into account files with differing suffixes or files
+// with a prepended path with more than one separator.
+// (It does handle all files included with the distribution except
+//  changes.stone_soup.)
+bool get_dos_compatible_file_name(std::string *fname)
+{
+    std::string::size_type pos1 = fname->find("\\");
+    if (pos1 == std::string::npos)
+        pos1 = 0;
+
+    const std::string::size_type pos2 = fname->find(".txt");
+    // Name already fits DOS requirements, nothing to be done.
+    if (fname->substr(pos1, pos2).length() <= 8)
+        return (false);
+
+    *fname = fname->substr(0,pos1) + fname->substr(pos1, pos1 + 6) + "~1.txt";
+
+    return (true);
+}
+#endif
+
+
 // Returns the names of all files in the given directory. Note that the
 // filenames returned are relative to the directory.
 std::vector<std::string> get_dir_files(const std::string &dirname)