Fix bug #13553 with usage of IS_DIRECTORY_SEP on MS-Windows under DBCS.

 src/w32.c (parse_root, get_volume_info, readdir, read_unc_volume)
 (logon_network_drive, stat_worker, symlink, chase_symlinks): Use
 CharNextExA and CharPrevExA to iterate over file names encoded in
 DBCS.

2 files changed, 158 insertions, 22 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index cd71fa73db0..a5108f79f3d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,10 @@
+2013-01-26  Eli Zaretskii  <eliz@gnu.org>
+
+        * w32.c (parse_root, get_volume_info, readdir, read_unc_volume)
+        (logon_network_drive, stat_worker, symlink, chase_symlinks): Use
+        CharNextExA and CharPrevExA to iterate over file names encoded in
+        DBCS.  (Bug#13553)
+
 2013-01-25  Eli Zaretskii  <eliz@gnu.org>
 
         * w32.c (w32_get_long_filename, init_environment, readlink):
diff --git a/src/w32.c b/src/w32.c
index 86b4ea72a22..3e300d1b9a3 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -1503,12 +1503,17 @@ parse_root (char * name, char ** pPath)
   else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
     {
       int slashes = 2;
+      int dbcs_p = max_filename_mbslen () > 1;
+
       name += 2;
       do
         {
           if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
             break;
-          name++;
+          if (dbcs_p)
+            name = CharNextExA (file_name_codepage, name, 0);
+          else
+            name++;
         }
       while ( *name );
       if (IS_DIRECTORY_SEP (name[0]))
@@ -2369,12 +2374,23 @@ get_volume_info (const char * name, const char ** pPath)
     {
       char *str = temp;
       int slashes = 4;
+      int dbcs_p = max_filename_mbslen () > 1;
+
       rootname = temp;
       do
         {
           if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
             break;
-          *str++ = *name++;
+          if (!dbcs_p)
+            *str++ = *name++;
+          else
+            {
+              const char *p = name;
+
+              name = CharNextExA (file_name_codepage, name, 0);
+              memcpy (str, p, name - p);
+              str += name - p;
+            }
         }
       while ( *name );
 
@@ -2610,11 +2626,23 @@ readdir (DIR *dirp)
     {
       char filename[MAXNAMLEN + 3];
       int ln;
+      int dbcs_p = max_filename_mbslen () > 1;
 
       strcpy (filename, dir_pathname);
       ln = strlen (filename) - 1;
-      if (!IS_DIRECTORY_SEP (filename[ln]))
-        strcat (filename, "\\");
+      if (!dbcs_p)
+        {
+          if (!IS_DIRECTORY_SEP (filename[ln]))
+            strcat (filename, "\\");
+        }
+      else
+        {
+          char *end = filename + ln + 1;
+          char *last_char = CharPrevExA (file_name_codepage, filename, end, 0);
+
+          if (!IS_DIRECTORY_SEP (*last_char))
+            strcat (filename, "\\");
+        }
       strcat (filename, "*");
 
       /* Note: No need to resolve symlinks in FILENAME, because
@@ -2719,6 +2747,7 @@ read_unc_volume (HANDLE henum, char *readbuf, int size)
   DWORD bufsize = 512;
   char *buffer;
   char *ptr;
+  int dbcs_p = max_filename_mbslen () > 1;
 
   count = 1;
   buffer = alloca (bufsize);
@@ -2729,7 +2758,13 @@ read_unc_volume (HANDLE henum, char *readbuf, int size)
   /* WNetEnumResource returns \\resource\share...skip forward to "share". */
   ptr = ((LPNETRESOURCE) buffer)->lpRemoteName;
   ptr += 2;
-  while (*ptr && !IS_DIRECTORY_SEP (*ptr)) ptr++;
+  if (!dbcs_p)
+    while (*ptr && !IS_DIRECTORY_SEP (*ptr)) ptr++;
+  else
+    {
+      while (*ptr && !IS_DIRECTORY_SEP (*ptr))
+        ptr = CharNextExA (file_name_codepage, ptr, 0);
+    }
   ptr++;
 
   strncpy (readbuf, ptr, size);
@@ -2766,9 +2801,11 @@ logon_network_drive (const char *path)
 {
   NETRESOURCE resource;
   char share[MAX_PATH];
-  int i, n_slashes;
+  int n_slashes;
   char drive[4];
   UINT drvtype;
+  char *p;
+  int dbcs_p;
 
   if (IS_DIRECTORY_SEP (path[0]) && IS_DIRECTORY_SEP (path[1]))
     drvtype = DRIVE_REMOTE;
@@ -2790,13 +2827,18 @@ logon_network_drive (const char *path)
   n_slashes = 2;
   strncpy (share, path, MAX_PATH);
   /* Truncate to just server and share name.  */
-  for (i = 2; i < MAX_PATH; i++)
+  dbcs_p = max_filename_mbslen () > 1;
+  for (p = share + 2; *p && p < share + MAX_PATH; )
     {
-      if (IS_DIRECTORY_SEP (share[i]) && ++n_slashes > 3)
+      if (IS_DIRECTORY_SEP (*p) && ++n_slashes > 3)
         {
-          share[i] = '\0';
+          *p = '\0';
           break;
         }
+      if (dbcs_p)
+        p = CharNextExA (file_name_codepage, p, 0);
+      else
+        p++;
     }
 
   resource.dwType = RESOURCETYPE_DISK;
@@ -3557,6 +3599,7 @@ stat_worker (const char * path, struct stat * buf, int follow_symlinks)
   DWORD access_rights = 0;
   DWORD fattrs = 0, serialnum = 0, fs_high = 0, fs_low = 0, nlinks = 1;
   FILETIME ctime, atime, wtime;
+  int dbcs_p;
 
   if (path == NULL || buf == NULL)
     {
@@ -3751,6 +3794,7 @@ stat_worker (const char * path, struct stat * buf, int follow_symlinks)
          did not ask for extra precision, resolving symlinks will fly
          in the face of that request, since the user then wants the
          lightweight version of the code.  */
+      dbcs_p = max_filename_mbslen () > 1;
       rootdir = (path >= save_name + len - 1
                  && (IS_DIRECTORY_SEP (*path) || *path == 0));
 
@@ -3778,8 +3822,19 @@ stat_worker (const char * path, struct stat * buf, int follow_symlinks)
         }
       else if (rootdir)
         {
-          if (!IS_DIRECTORY_SEP (name[len-1]))
-            strcat (name, "\\");
+          if (!dbcs_p)
+            {
+              if (!IS_DIRECTORY_SEP (name[len-1]))
+                strcat (name, "\\");
+            }
+          else
+            {
+              char *end = name + len;
+              char *n = CharPrevExA (file_name_codepage, name, end, 0);
+
+              if (!IS_DIRECTORY_SEP (*n))
+                strcat (name, "\\");
+            }
           if (GetDriveType (name) < 2)
             {
               errno = ENOENT;
@@ -3791,15 +3846,37 @@ stat_worker (const char * path, struct stat * buf, int follow_symlinks)
         }
       else
         {
-          if (IS_DIRECTORY_SEP (name[len-1]))
-            name[len - 1] = 0;
+          if (!dbcs_p)
+            {
+              if (IS_DIRECTORY_SEP (name[len-1]))
+                name[len - 1] = 0;
+            }
+          else
+            {
+              char *end = name + len;
+              char *n = CharPrevExA (file_name_codepage, name, end, 0);
+
+              if (IS_DIRECTORY_SEP (*n))
+                *n = 0;
+            }
 
           /* (This is hacky, but helps when doing file completions on
              network drives.)  Optimize by using information available from
              active readdir if possible.  */
           len = strlen (dir_pathname);
-          if (IS_DIRECTORY_SEP (dir_pathname[len-1]))
-            len--;
+          if (!dbcs_p)
+            {
+              if (IS_DIRECTORY_SEP (dir_pathname[len-1]))
+                len--;
+            }
+          else
+            {
+              char *end = dir_pathname + len;
+              char *n = CharPrevExA (file_name_codepage, dir_pathname, end, 0);
+
+              if (IS_DIRECTORY_SEP (*n))
+                len--;
+            }
           if (dir_find_handle != INVALID_HANDLE_VALUE
               && !(is_a_symlink && follow_symlinks)
               && strnicmp (save_name, dir_pathname, len) == 0
@@ -4060,6 +4137,7 @@ symlink (char const *filename, char const *linkname)
   char linkfn[MAX_PATH], *tgtfn;
   DWORD flags = 0;
   int dir_access, filename_ends_in_slash;
+  int dbcs_p;
 
   /* Diagnostics follows Posix as much as possible.  */
   if (filename == NULL || linkname == NULL)
@@ -4085,6 +4163,8 @@ symlink (char const *filename, char const *linkname)
       return -1;
     }
 
+  dbcs_p = max_filename_mbslen () > 1;
+
   /* Note: since empty FILENAME was already rejected, we can safely
      refer to FILENAME[1].  */
   if (!(IS_DIRECTORY_SEP (filename[0]) || IS_DEVICE_SEP (filename[1])))
@@ -4099,8 +4179,21 @@ symlink (char const *filename, char const *linkname)
       char tem[MAX_PATH];
       char *p = linkfn + strlen (linkfn);
 
-      while (p > linkfn && !IS_ANY_SEP (p[-1]))
-        p--;
+      if (!dbcs_p)
+        {
+          while (p > linkfn && !IS_ANY_SEP (p[-1]))
+            p--;
+        }
+      else
+        {
+          char *p1 = CharPrevExA (file_name_codepage, linkfn, p, 0);
+
+          while (p > linkfn && !IS_ANY_SEP (*p1))
+            {
+              p = p1;
+              p1 = CharPrevExA (file_name_codepage, linkfn, p1, 0);
+            }
+        }
       if (p > linkfn)
         strncpy (tem, linkfn, p - linkfn);
       tem[p - linkfn] = '\0';
@@ -4115,7 +4208,15 @@ symlink (char const *filename, char const *linkname)
      exist, but ends in a slash, we create a symlink to directory.  If
      FILENAME exists and is a directory, we always create a symlink to
      directory.  */
-  filename_ends_in_slash = IS_DIRECTORY_SEP (filename[strlen (filename) - 1]);
+  if (!dbcs_p)
+    filename_ends_in_slash = IS_DIRECTORY_SEP (filename[strlen (filename) - 1]);
+  else
+    {
+      const char *end = filename + strlen (filename);
+      const char *n = CharPrevExA (file_name_codepage, filename, end, 0);
+
+      filename_ends_in_slash = IS_DIRECTORY_SEP (*n);
+    }
   if (dir_access == 0 || filename_ends_in_slash)
     flags = SYMBOLIC_LINK_FLAG_DIRECTORY;
 
@@ -4440,6 +4541,7 @@ chase_symlinks (const char *file)
   char link[MAX_PATH];
   ssize_t res, link_len;
   int loop_count = 0;
+  int dbcs_p;
 
   if (is_windows_9x () == TRUE || !is_symlink (file))
     return (char *)file;
@@ -4447,13 +4549,27 @@ chase_symlinks (const char *file)
   if ((link_len = GetFullPathName (file, MAX_PATH, link, NULL)) == 0)
     return (char *)file;
 
+  dbcs_p = max_filename_mbslen () > 1;
   target[0] = '\0';
   do {
 
     /* Remove trailing slashes, as we want to resolve the last
        non-trivial part of the link name.  */
-    while (link_len > 3 && IS_DIRECTORY_SEP (link[link_len-1]))
-      link[link_len--] = '\0';
+    if (!dbcs_p)
+      {
+        while (link_len > 3 && IS_DIRECTORY_SEP (link[link_len-1]))
+          link[link_len--] = '\0';
+      }
+    else if (link_len > 3)
+      {
+        char *n = CharPrevExA (file_name_codepage, link, link + link_len, 0);
+
+        while (n >= link + 2 && IS_DIRECTORY_SEP (*n))
+          {
+            n[1] = '\0';
+            n = CharPrevExA (file_name_codepage, link, n, 0);
+          }
+      }
 
     res = readlink (link, target, MAX_PATH);
     if (res > 0)
@@ -4466,8 +4582,21 @@ chase_symlinks (const char *file)
                the symlink, then copy the result back to target.  */
             char *p = link + link_len;
 
-            while (p > link && !IS_ANY_SEP (p[-1]))
-              p--;
+            if (!dbcs_p)
+              {
+                while (p > link && !IS_ANY_SEP (p[-1]))
+                  p--;
+              }
+            else
+              {
+                char *p1 = CharPrevExA (file_name_codepage, link, p, 0);
+
+                while (p > link && !IS_ANY_SEP (*p1))
+                  {
+                    p = p1;
+                    p1 = CharPrevExA (file_name_codepage, link, p1, 0);
+                  }
+              }
             strcpy (p, target);
             strcpy (target, link);
           }