Make Unicode filenames work on Windows

6 files changed, 391 insertions, 305 deletions

diff --git a/erts/emulator/beam/erl_unicode.c b/erts/emulator/beam/erl_unicode.c
index 6d8e9ccd90..4f26f078ce 100644
--- a/erts/emulator/beam/erl_unicode.c
+++ b/erts/emulator/beam/erl_unicode.c
@@ -2104,7 +2104,11 @@ L_Again:   /* Restart with sublist, old listend was pushed on stack */
 }
 
 
-
+/*
+ * This internal bif converts a filename to whatever format is suitable for the file driver
+ * It also adds zero termination so that prim_file neednt bother with the character encoding
+ * of the file driver 
+ */
 BIF_RETTYPE prim_file_internal_name2native_1(BIF_ALIST_1)
 {
     int encoding = erts_get_native_filename_encoding();
@@ -2119,28 +2123,36 @@ BIF_RETTYPE prim_file_internal_name2native_1(BIF_ALIST_1)
 	Uint unipoint;
 	/* Uninterpreted encoding except if windows widechar, in case we convert from 
 	   utf8 to win_wchar */
+	size = binary_size(BIF_ARG_1);
+	bytes = erts_get_aligned_binary_bytes(BIF_ARG_1, &temp_alloc);
 	if (encoding != ERL_FILENAME_WIN_WCHAR) {
-	    BIF_RET(BIF_ARG_1);
+	    /*Add 0 termination only*/
+	    bin_term = new_binary(BIF_P, NULL, size+1);
+	    bin_p = binary_bytes(bin_term);
+	    memcpy(bin_p,bytes,size);
+	    bin_p[size]=0;
+	    erts_free_aligned_binary_bytes(temp_alloc);
+	    BIF_RET(bin_term);
 	} 
 	/* In a wchar world, the emulator flags only affect how
 	   binaries are interpreted when sent from the user. */
 	/* Determine real length and create a new binary */
-	size = binary_size(BIF_ARG_1);
-	bytes = erts_get_aligned_binary_bytes(BIF_ARG_1, &temp_alloc);
 	if (analyze_utf8(bytes,size,&err_pos,&num_chars,NULL) != UTF8_OK || 
 	    erts_get_user_requested_filename_encoding() ==  ERL_FILENAME_LATIN1) {
 	    /* What to do now? Maybe latin1, so just take byte for byte instead */
-	    bin_term = new_binary(BIF_P, 0, size*2);
+	    bin_term = new_binary(BIF_P, 0, (size+1)*2);
 	    bin_p = binary_bytes(bin_term);
 	    while (size--) {
 		*bin_p++ = *bytes++;
 		*bin_p++ = 0;
 	    }
+	    *bin_p++ = 0;
+	    *bin_p++ = 0;
 	    erts_free_aligned_binary_bytes(temp_alloc);
 	    BIF_RET(bin_term);
 	}
 	/* OK, UTF8 ok, number of characters is in num_chars */
-	bin_term = new_binary(BIF_P, 0, num_chars*2);
+	bin_term = new_binary(BIF_P, 0, (num_chars+1)*2);
 	bin_p = binary_bytes(bin_term);
 	while (num_chars--) {
 	    if (((*bytes) & ((byte) 0x80)) == 0) {
@@ -2170,6 +2182,9 @@ BIF_RETTYPE prim_file_internal_name2native_1(BIF_ALIST_1)
 	    *bin_p++ = (byte) (unipoint & 0xFF);
 	    *bin_p++ = (byte) ((unipoint >> 8) & 0xFF);
 	}
+	/* zero termination */
+	*bin_p++ = 0;
+	*bin_p++ = 0;
 	erts_free_aligned_binary_bytes(temp_alloc);
 	BIF_RET(bin_term);
     } /* binary */   
@@ -2178,9 +2193,19 @@ BIF_RETTYPE prim_file_internal_name2native_1(BIF_ALIST_1)
     if ((need = simple_char_need(BIF_ARG_1,encoding)) < 0) {
 	BIF_ERROR(BIF_P,BADARG);
     }
+    if (encoding == ERL_FILENAME_WIN_WCHAR) {
+	need += 2;
+    } else {
+	++need;
+    }
+    
     bin_term = new_binary(BIF_P, 0, need);
     bin_p = binary_bytes(bin_term);
     simple_put_chars(BIF_ARG_1,encoding,bin_p); 
+    bin_p[need-1] = 0;
+    if (encoding == ERL_FILENAME_WIN_WCHAR) {
+	bin_p[need-2] = 0;
+    }
     BIF_RET(bin_term);
 }
 
@@ -2243,6 +2268,7 @@ BIF_RETTYPE prim_file_internal_native2name_1(BIF_ALIST_1)
 	    Uint x = ((Uint) *bytes--) << 8;
 	    x |= ((Uint) *bytes--);
 	    ret = CONS(hp,make_small(x),ret);
+	    hp += 2;
 	    size -= 2;
 	}	    
 	erts_free_aligned_binary_bytes(temp_alloc);
diff --git a/erts/emulator/drivers/common/efile_drv.c b/erts/emulator/drivers/common/efile_drv.c
index 5aa5f60d0f..ac73897cf2 100644
--- a/erts/emulator/drivers/common/efile_drv.c
+++ b/erts/emulator/drivers/common/efile_drv.c
@@ -111,11 +111,11 @@ void erl_exit(int n, char *fmt, ...);
 static ErlDrvSysInfo sys_info;
 
 
-/*#define TRACE 1*/
+/* #define TRACE 1 */
 #ifdef TRACE
-#    define TRACE_C(c) (putchar(c))
-#    define TRACE_S(s) (fputs((s), stdout))
-#    define TRACE_F(args) (printf args)
+#    define TRACE_C(c) do { putchar(c); fflush(stdout); } while (0)
+#    define TRACE_S(s) do { fputs((s), stdout); fflush(stdout); } while (0)
+#    define TRACE_F(args) do { printf args ;fflush(stdout); } while (0)
 #else
 #    define TRACE_C(c) ((void)(0))
 #    define TRACE_S(s) ((void)(0))
@@ -139,24 +139,54 @@ static ErlDrvSysInfo sys_info;
 #define MUTEX_UNLOCK(m)
 #endif
 
-
-
 #if 0
 /* Experimental, for forcing all file operations to use the same thread. */
-static unsigned file_fixed_key = 1;
-#define KEY(desc) (&file_fixed_key)
+   static unsigned file_fixed_key = 1;
+#  define KEY(desc) (&file_fixed_key)
 #else
-#define KEY(desc) (&(desc)->key)
+#  define KEY(desc) (&(desc)->key)
 #endif
 
 
+#ifdef FILENAMES_16BIT
+#  define FILENAME_BYTELEN(Str) filename_len_16bit(Str)
+#  define FILENAME_COPY(To,From) filename_cpy_16bit((To),(From)) 
+#  define FILENAME_CHARSIZE 2
+
+   static int filename_len_16bit(char *str) 
+   {
+       char *p = str;
+       while(*p != '\0' || p[1] != '\0') {
+	   p += 2;
+       }
+       return (p - str);
+   }
+
+   static void filename_cpy_16bit(char *to, char *from) 
+   {
+       while(*from != '\0' || from[1] != '\0') {
+	   *to++ = *from++;
+	   *to++ = *from++;
+       }
+       *to++ = *from++;
+       *to++ = *from++;
+   }
+
+#else
+#  define FILENAME_BYTELEN(Str) strlen(Str)
+#  define FILENAME_COPY(To,From) strcpy(To,From) 
+#  define FILENAME_CHARSIZE 1
+#endif
 
-#if     MAXPATHLEN >= BUFSIZ
-#define    RESBUFSIZE  MAXPATHLEN+1
+#if     (MAXPATHLEN+1)*FILENAME_CHARSIZE+1 > BUFSIZ
+#  define    RESBUFSIZE  ((MAXPATHLEN+1)*FILENAME_CHARSIZE+1)
 #else
-#define    RESBUFSIZE  BUFSIZ
+#  define    RESBUFSIZE  BUFSIZ
 #endif
 
+
+
+
 #define GET_TIME(i, b) \
     (i).year  = get_int32((b) + 0 * 4); \
     (i).month = get_int32((b) + 1 * 4); \
@@ -288,9 +318,9 @@ struct t_preadv {
 };
 
 #define READDIR_BUFSIZE (8*1024)
-#if READDIR_BUFSIZE < (2*MAXPATHLEN)
-#undef READDIR_BUFSIZE
-#define READDIR_BUFSIZE (2*MAXPATHLEN)
+#if READDIR_BUFSIZE < (FILENAME_CHARSIZE*2*(MAXPATHLEN+1))
+#  undef READDIR_BUFSIZE
+#  define READDIR_BUFSIZE (FILENAME_CHARSIZE*2*(MAXPATHLEN+1))
 #endif
 
 struct t_readdir_buf {
@@ -371,6 +401,7 @@ struct t_data
 };
 
 
+
 #define EF_ALLOC(S)		driver_alloc((S))
 #define EF_REALLOC(P, S)	driver_realloc((P), (S))
 #define EF_SAFE_ALLOC(S)	ef_safe_alloc((S))
@@ -1290,7 +1321,7 @@ static void invoke_writev(void *data) {
 	 p < size && iovcnt < iovlen;
 	 p += iov0[iovcnt++].iov_len)
 	;
-    iov = EF_ALLOC(sizeof(SysIOVec)*iovcnt);
+    iov = EF_SAFE_ALLOC(sizeof(SysIOVec)*iovcnt);
     memcpy(iov,iov0,iovcnt*sizeof(SysIOVec));
     MUTEX_UNLOCK(d->c.writev.q_mtx);
     /* Let go of lock until we deque from original vector */
@@ -1407,7 +1438,7 @@ static void invoke_pwritev(void *data) {
     /* Lock the queue just for a while, we don't want it locked during write */
     MUTEX_LOCK(c->q_mtx);
     iov0 = driver_peekq(c->port, &iovlen);
-    iov = EF_ALLOC(sizeof(SysIOVec)*iovlen);
+    iov = EF_SAFE_ALLOC(sizeof(SysIOVec)*iovlen);
     memcpy(iov,iov0,sizeof(SysIOVec)*iovlen);
     MUTEX_UNLOCK(c->q_mtx);
 
@@ -1501,7 +1532,7 @@ static void invoke_link(void *data)
     char *new_name;
 
     d->again = 0;
-    new_name = name+strlen(name)+1;
+    new_name = name+FILENAME_BYTELEN(name)+FILENAME_CHARSIZE;
     d->result_ok = efile_link(&d->errInfo, name, new_name);
 }
 
@@ -1512,7 +1543,7 @@ static void invoke_symlink(void *data)
     char *new_name;
 
     d->again = 0;
-    new_name = name+strlen(name)+1;
+    new_name = name+FILENAME_BYTELEN(name)+FILENAME_CHARSIZE;
     d->result_ok = efile_symlink(&d->errInfo, name, new_name);
 }
 
@@ -1523,7 +1554,7 @@ static void invoke_rename(void *data)
     char *new_name;
 
     d->again = 0;
-    new_name = name+strlen(name)+1;
+    new_name = name+FILENAME_BYTELEN(name)+FILENAME_CHARSIZE;
     d->result_ok = efile_rename(&d->errInfo, name, new_name);
 }
 
@@ -1571,13 +1602,15 @@ static void invoke_readdir(void *data)
     int s;
     char *p = NULL;
     int buf_sz = 0;
+    size_t tmp_bs;
 
     d->again = 0;
     d->errInfo.posix_errno = 0;
 
     while (1) {
 	char *str;
-	if (buf_sz < (4 /* sz */ + 1 /* cmd */ + MAXPATHLEN + 1 /* '\0' */)) {
+	if (buf_sz < (4 /* sz */ + 1 /* cmd */ + 
+		      FILENAME_CHARSIZE*(MAXPATHLEN + 1))) {
 	    struct t_readdir_buf *b;
 	    if (p) {
 		put_int32(0, p); /* EOB */
@@ -1597,14 +1630,14 @@ static void invoke_readdir(void *data)
 	buf_sz -= 4 + 1;
 	str = p + 4 + 1;
 	ASSERT(buf_sz >= MAXPATHLEN + 1);
-	s = efile_readdir(&d->errInfo, d->b, &d->dir_handle, str, buf_sz);
+	tmp_bs = buf_sz;
+	s = efile_readdir(&d->errInfo, d->b, &d->dir_handle, str, &tmp_bs);
 
 	if (s) {
-	    int str_sz = strlen(str);
-	    int sz = str_sz + 1;
-	    put_int32(sz, p);
-	    p += 4 + sz;
-	    buf_sz -= str_sz;
+	    put_int32(tmp_bs + 1 /* 1 byte for opcode */, p);
+	    p += 4 + tmp_bs + 1;
+	    ASSERT(p == (str + tmp_bs));
+	    buf_sz -= tmp_bs;
 	}
 	else {
 	    put_int32(1, p);
@@ -1971,7 +2004,7 @@ file_async_ready(ErlDrvData e, ErlDrvThreadData data)
 		reply_error(desc, &d->errInfo);
 	    else {
 		resbuf[0] = FILE_RESP_FNAME;
-		length = 1+strlen((char*) resbuf+1);
+		length = 1+FILENAME_BYTELEN((char*) resbuf+1);
 		TRACE_C('R');
 		driver_output2(desc->port, resbuf, 1, resbuf+1, length-1);
 	    }
@@ -2033,13 +2066,18 @@ file_async_ready(ErlDrvData e, ErlDrvThreadData data)
 		int sz = get_int32(p);
 		while (sz) { /* 0 == EOB */
 		    p += 4;
-		    driver_output2(desc->port, p, 1, p+1, sz-1);
+		    if (sz - 1 > 0) {
+			driver_output2(desc->port, p, 1, p+1, sz-1);
+		    } else {
+			driver_output2(desc->port, p, 1, NULL, 0);
+		    }
 		    p += sz;
 		    sz = get_int32(p);
 		}
 		b1 = b1->next;
 		EF_FREE(b2);
 	    }
+	    
 	    d->c.read_dir.first_buf = NULL;
 	    d->c.read_dir.last_buf = NULL;
 	}
@@ -2115,9 +2153,9 @@ file_output(ErlDrvData e, char* buf, int count)
 
     case FILE_MKDIR:
     {
-	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + strlen(name) + 1);
+	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + FILENAME_BYTELEN(name) + FILENAME_CHARSIZE);
 	
-	strcpy(d->b, name);
+	FILENAME_COPY(d->b, name);
 	d->command = command;
 	d->invoke = invoke_mkdir;
 	d->free = free_data;
@@ -2126,9 +2164,9 @@ file_output(ErlDrvData e, char* buf, int count)
     }
     case FILE_RMDIR:
     {
-	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + strlen(name) + 1);
+	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + FILENAME_BYTELEN(name) + FILENAME_CHARSIZE);
 	
-	strcpy(d->b, name);
+	FILENAME_COPY(d->b, name);
 	d->command = command;
 	d->invoke = invoke_rmdir;
 	d->free = free_data;
@@ -2137,9 +2175,9 @@ file_output(ErlDrvData e, char* buf, int count)
     }
     case FILE_DELETE:
     {
-	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + strlen(name) + 1);
+	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + FILENAME_BYTELEN(name) + FILENAME_CHARSIZE);
 	
-	strcpy(d->b, name);
+	FILENAME_COPY(d->b, name);
 	d->command = command;
 	d->invoke = invoke_delete_file;
 	d->free = free_data;
@@ -2149,14 +2187,14 @@ file_output(ErlDrvData e, char* buf, int count)
     case FILE_RENAME:
 	{
 	    char* new_name;
-
-	    new_name = name+strlen(name)+1;
+	    int namelen = FILENAME_BYTELEN(name)+FILENAME_CHARSIZE;
+	    new_name = name+namelen;
 	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1
-			      + strlen(name) + 1
-			      + strlen(new_name) + 1);
+			      + namelen
+			      + FILENAME_BYTELEN(new_name) + FILENAME_CHARSIZE);
 	
-	    strcpy(d->b, name);
-	    strcpy(d->b + strlen(name) + 1, new_name);
+	    FILENAME_COPY(d->b, name);
+	    FILENAME_COPY(d->b + namelen, new_name);
 	    d->flags = desc->flags;
 	    d->fd = fd;
 	    d->command = command;
@@ -2167,9 +2205,9 @@ file_output(ErlDrvData e, char* buf, int count)
 	}
     case FILE_CHDIR:
     {
-	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + strlen(name) + 1);
+	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + FILENAME_BYTELEN(name) + FILENAME_CHARSIZE);
 	
-	strcpy(d->b, name);
+	FILENAME_COPY(d->b, name);
 	d->command = command;
 	d->invoke = invoke_chdir;
 	d->free = free_data;
@@ -2192,9 +2230,10 @@ file_output(ErlDrvData e, char* buf, int count)
 #ifdef USE_THREADS
 	if (sys_info.async_threads > 0)
 	{
-	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + strlen(name) + 1);
+	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + FILENAME_BYTELEN(name) + 
+			      FILENAME_CHARSIZE);
 	
-	    strcpy(d->b, name);
+	    FILENAME_COPY(d->b, name);
 	    d->dir_handle = NULL;
 	    d->command = command;
 	    d->invoke = invoke_readdir;
@@ -2207,17 +2246,19 @@ file_output(ErlDrvData e, char* buf, int count)
 	else   
 #endif
 	{
+	    size_t resbufsize;
 	    char resbuf[RESBUFSIZE+1];
 	    EFILE_DIR_HANDLE dir_handle; /* Handle to open directory. */
 
 	    errInfo.posix_errno = 0;
 	    dir_handle = NULL;
 	    resbuf[0] = FILE_RESP_FNAME;
+	    resbufsize = RESBUFSIZE;
 
 	    while (efile_readdir(&errInfo, name, &dir_handle,
-				 resbuf+1, RESBUFSIZE)) {
-		int length = strlen(resbuf+1);
-		driver_output2(desc->port, resbuf, 1, resbuf+1, length);
+				 resbuf+1, &resbufsize)) {
+		driver_output2(desc->port, resbuf, 1, resbuf+1, resbufsize);
+		resbufsize = RESBUFSIZE;
 	    }
 	    if (errInfo.posix_errno != 0) {
 		reply_error(desc, &errInfo);
@@ -2229,11 +2270,12 @@ file_output(ErlDrvData e, char* buf, int count)
 	}
     case FILE_OPEN:
 	{
-	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + strlen(buf+4) + 1);
+	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + FILENAME_BYTELEN(buf+4) + 
+			      FILENAME_CHARSIZE);
 	
 	    d->flags = get_int32((uchar*)buf);
 	    name = buf+4;
-	    strcpy(d->b, name);
+	    FILENAME_COPY(d->b, name);
 	    d->command = command;
 	    d->invoke = invoke_open;
 	    d->free = free_data;
@@ -2242,44 +2284,45 @@ file_output(ErlDrvData e, char* buf, int count)
 	}
 
     case FILE_FDATASYNC:
-    {
+	{
 	    d = EF_SAFE_ALLOC(sizeof(struct t_data));
-
+	    
 	    d->fd = fd;
 	    d->command = command;
 	    d->invoke = invoke_fdatasync;
 	    d->free = free_data;
 	    d->level = 2;
 	    goto done;
-    }
+	}
 
     case FILE_FSYNC:
-    {
-	d = EF_SAFE_ALLOC(sizeof(struct t_data));
-	
-	d->fd = fd;
-	d->command = command;
-	d->invoke = invoke_fsync;
-	d->free = free_data;
-	d->level = 2;
-	goto done;
-    }
+	{
+	    d = EF_SAFE_ALLOC(sizeof(struct t_data));
+	    
+	    d->fd = fd;
+	    d->command = command;
+	    d->invoke = invoke_fsync;
+	    d->free = free_data;
+	    d->level = 2;
+	    goto done;
+	}
 
 
     case FILE_FSTAT: 
     case FILE_LSTAT:
-    {
-	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + strlen(name) + 1);
+	{
+	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + FILENAME_BYTELEN(name) + 
+			      FILENAME_CHARSIZE);
+	    
+	    FILENAME_COPY(d->b, name);
+	    d->fd = fd;
+	    d->command = command;
+	    d->invoke = invoke_flstat;
+	    d->free = free_data;
+	    d->level = 2;
+	    goto done;
+	}
 	
-	strcpy(d->b, name);
-	d->fd = fd;
-	d->command = command;
-	d->invoke = invoke_flstat;
-	d->free = free_data;
-	d->level = 2;
-	goto done;
-    }
-
     case FILE_TRUNCATE:
         {
 	    d = EF_SAFE_ALLOC(sizeof(struct t_data));
@@ -2296,7 +2339,7 @@ file_output(ErlDrvData e, char* buf, int count)
     case FILE_WRITE_INFO:
 	{
 	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1
-			      + strlen(buf+21*4) + 1);
+			      + FILENAME_BYTELEN(buf+21*4) + FILENAME_CHARSIZE);
 	    
 	    d->info.mode = get_int32(buf + 0 * 4);
 	    d->info.uid = get_int32(buf + 1 * 4);
@@ -2304,7 +2347,7 @@ file_output(ErlDrvData e, char* buf, int count)
 	    GET_TIME(d->info.accessTime, buf + 3 * 4);
 	    GET_TIME(d->info.modifyTime, buf + 9 * 4);
 	    GET_TIME(d->info.cTime, buf + 15 * 4);
-	    strcpy(d->b, buf+21*4);
+	    FILENAME_COPY(d->b, buf+21*4);
 	    d->command = command;
 	    d->invoke = invoke_write_info;
 	    d->free = free_data;
@@ -2316,7 +2359,7 @@ file_output(ErlDrvData e, char* buf, int count)
 	{
 	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + RESBUFSIZE + 1);
 	
-	    strcpy(d->b, name);
+	    FILENAME_COPY(d->b, name);
 	    d->command = command;
 	    d->invoke = invoke_readlink;
 	    d->free = free_data;
@@ -2325,28 +2368,29 @@ file_output(ErlDrvData e, char* buf, int count)
 	}
 
     case FILE_ALTNAME:
-    {
-	d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + RESBUFSIZE + 1);
-	strcpy(d->b, name);
-	d->command = command;
-	d->invoke = invoke_altname;
-	d->free = free_data;
-	d->level = 2;
-	goto done;
-    }
+	{
+	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1 + RESBUFSIZE + 1);
+	    FILENAME_COPY(d->b, name);
+	    d->command = command;
+	    d->invoke = invoke_altname;
+	    d->free = free_data;
+	    d->level = 2;
+	    goto done;
+	}
 
 
     case FILE_LINK:
 	{
 	    char* new_name;
+	    int namelen = FILENAME_BYTELEN(name) + FILENAME_CHARSIZE;
 
-	    new_name = name+strlen(name)+1;
+	    new_name = name+namelen;
 	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1
-			      + strlen(name) + 1
-			      + strlen(new_name) + 1);
+			      + namelen
+			      + FILENAME_BYTELEN(new_name) + FILENAME_CHARSIZE);
 	
-	    strcpy(d->b, name);
-	    strcpy(d->b + strlen(name) + 1, new_name);
+	    FILENAME_COPY(d->b, name);
+	    FILENAME_COPY(d->b + namelen, new_name);
 	    d->flags = desc->flags;
 	    d->fd = fd;
 	    d->command = command;
@@ -2359,14 +2403,15 @@ file_output(ErlDrvData e, char* buf, int count)
     case FILE_SYMLINK:
 	{
 	    char* new_name;
+	    int namelen = FILENAME_BYTELEN(name) + FILENAME_CHARSIZE;
 
-	    new_name = name+strlen(name)+1;
+	    new_name = name+namelen;
 	    d = EF_SAFE_ALLOC(sizeof(struct t_data) - 1
-			      + strlen(name) + 1
-			      + strlen(new_name) + 1);
+			      + namelen
+			      + FILENAME_BYTELEN(new_name) + FILENAME_CHARSIZE);
 	
-	    strcpy(d->b, name);
-	    strcpy(d->b + strlen(name) + 1, new_name);
+	    FILENAME_COPY(d->b, name);
+	    FILENAME_COPY(d->b + namelen, new_name);
 	    d->flags = desc->flags;
 	    d->fd = fd;
 	    d->command = command;
@@ -3006,6 +3051,7 @@ file_outputv(ErlDrvData e, ErlIOVec *ev) {
 
     case FILE_READ_FILE: {
 	struct t_data *d;
+	char *filename;
 	if (ev->size < 1+1) {
 	    /* Buffer contains empty name */
 	    reply_posix_error(desc, ENOENT);
@@ -3016,7 +3062,8 @@ file_outputv(ErlDrvData e, ErlIOVec *ev) {
 	    reply_posix_error(desc, EINVAL);
 	    goto done;
 	}
-	d = EF_ALLOC(sizeof(struct t_data) + ev->size);
+	filename = EV_CHAR_P(ev, p, q);
+	d = EF_ALLOC(sizeof(struct t_data) -1 + FILENAME_BYTELEN(filename) + FILENAME_CHARSIZE);
 	if (! d) {
 	    reply_posix_error(desc, ENOMEM);
 	    goto done;
@@ -3024,8 +3071,7 @@ file_outputv(ErlDrvData e, ErlIOVec *ev) {
 	d->command = command;
 	d->reply = !0;
 	/* Copy name */
-	memcpy(d->c.read_file.name, EV_CHAR_P(ev, p, q), ev->size-1);
-	d->c.read_file.name[ev->size-1] = '\0';
+	FILENAME_COPY(d->c.read_file.name, filename);
 	d->c.read_file.binp = NULL;
 	d->invoke = invoke_read_file;
 	d->free = free_read_file;
diff --git a/erts/emulator/drivers/common/erl_efile.h b/erts/emulator/drivers/common/erl_efile.h
index ac95c1f949..3097ded3f1 100644
--- a/erts/emulator/drivers/common/erl_efile.h
+++ b/erts/emulator/drivers/common/erl_efile.h
@@ -59,6 +59,14 @@
 #define FA_WRITE 	1
 #define FA_READ		2
 
+/* Some OS'es (i.e. Windows) has filenames in wide charaqcters. That requires special handling */
+/* Note that we do *not* honor alignment in the communication to the OS specific driver, */
+/* which is not a problem on x86, but might be on other platforms. The OS specific efile */
+/* implementation is expected to align if needed */
+#ifdef __WIN32__
+#define FILENAMES_16BIT 1
+#endif
+
 /*
  * An handle to an open directory.  To be cast to the correct type
  * in the system-dependent directory functions.
@@ -123,7 +131,7 @@ int efile_getdcwd(Efile_error* errInfo, int drive,
 		  char* buffer, size_t size);
 int efile_readdir(Efile_error* errInfo, char* name, 
 		  EFILE_DIR_HANDLE* dir_handle,
-		  char* buffer, size_t size);
+		  char* buffer, size_t *size);
 int efile_openfile(Efile_error* errInfo, char* name, int flags,
 		   int* pfd, Sint64* pSize);
 void efile_closefile(int fd);
diff --git a/erts/emulator/drivers/unix/unix_efile.c b/erts/emulator/drivers/unix/unix_efile.c
index b19f632f52..6297ccb8bc 100644
--- a/erts/emulator/drivers/unix/unix_efile.c
+++ b/erts/emulator/drivers/unix/unix_efile.c
@@ -587,7 +587,8 @@ efile_readdir(Efile_error* errInfo,	/* Where to return error codes. */
 						   open directory.*/
 	      char* buffer,		/* Pointer to buffer for 
 					   one filename. */
-	      size_t size)		/* Size of buffer. */
+	      size_t *size)		/* in-out Size of buffer, length
+					   of name. */
 {
     DIR *dp;			/* Pointer to directory structure. */
     struct dirent* dirp;	/* Pointer to directory entry. */
@@ -620,6 +621,7 @@ efile_readdir(Efile_error* errInfo,	/* Where to return error codes. */
 	    continue;
 	buffer[0] = '\0';
 	strncat(buffer, dirp->d_name, size-1);
+	*size = strlen(dirp->d_name);
 	return 1;
     }
 }
diff --git a/erts/emulator/drivers/win32/win_efile.c b/erts/emulator/drivers/win32/win_efile.c
index 6de08e2fa6..9fb4a66750 100755
--- a/erts/emulator/drivers/win32/win_efile.c
+++ b/erts/emulator/drivers/win32/win_efile.c
@@ -23,20 +23,20 @@
 #include <windows.h>
 #include "sys.h"
 #include <ctype.h>
-
+#include <wchar.h>
 #include "erl_efile.h"
 
 /*
  * Microsoft-specific function to map a WIN32 error code to a Posix errno.
  */
 
-#define ISSLASH(a)  ((a) == '\\' || (a) == '/')
+#define ISSLASH(a)  ((a) == L'\\' || (a) == L'/')
 
 #define ISDIR(st) (((st).st_mode&S_IFMT) == S_IFDIR)
 #define ISREG(st) (((st).st_mode&S_IFMT) == S_IFREG)
 
 #define IS_DOT_OR_DOTDOT(s) \
-    (s[0] == '.' && (s[1] == '\0' || (s[1] == '.' && s[2] == '\0')))
+    ((s)[0] == L'.' && ((s)[1] == L'\0' || ((s)[1] == L'.' && (s)[2] == L'\0')))
 
 #ifndef INVALID_FILE_ATTRIBUTES
 #define INVALID_FILE_ATTRIBUTES ((DWORD) 0xFFFFFFFF)
@@ -44,9 +44,9 @@
 
 static int check_error(int result, Efile_error* errInfo);
 static int set_error(Efile_error* errInfo);
-static int IsRootUNCName(const char* path);
-static int extract_root(char* name);
-static unsigned short dos_to_posix_mode(int attr, const char *name);
+static int is_root_unc_name(const WCHAR *path);
+static int extract_root(WCHAR *name);
+static unsigned short dos_to_posix_mode(int attr, const WCHAR *name);
 
 static int errno_map(DWORD last_error) {
 
@@ -196,27 +196,26 @@ win_writev(Efile_error* errInfo,
 
 
 int
-efile_mkdir(errInfo, name)
-Efile_error* errInfo;		/* Where to return error codes. */
-char* name;			/* Name of directory to create. */
+efile_mkdir(Efile_error* errInfo,	/* Where to return error codes. */
+	    char* name)			/* Name of directory to create. */
 {
-    return check_error(mkdir(name), errInfo);
+    return check_error(_wmkdir((WCHAR *) name), errInfo);
 }
 
 int
-efile_rmdir(errInfo, name)
-Efile_error* errInfo;		/* Where to return error codes. */
-char* name;			/* Name of directory to delete. */
+efile_rmdir(Efile_error* errInfo,	/* Where to return error codes. */
+	    char* name)			/* Name of directory to delete. */
 {
     OSVERSIONINFO os;
     DWORD attr;
+    WCHAR *wname = (WCHAR *) name;
 
-    if (RemoveDirectory(name) != FALSE) {
+    if (RemoveDirectoryW(wname) != FALSE) {
 	return 1;
     }
     errno = errno_map(GetLastError());
     if (errno == EACCES) {
-	attr = GetFileAttributes(name);
+	attr = GetFileAttributesW(wname);
 	if (attr != (DWORD) -1) {
 	    if ((attr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
 		/* 
@@ -238,21 +237,21 @@ char* name;			/* Name of directory to delete. */
 	    GetVersionEx(&os);
 	    if (os.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
 		HANDLE handle;
-		WIN32_FIND_DATA data;
-		char buffer[2*MAX_PATH];
+		WIN32_FIND_DATAW data;
+		WCHAR buffer[2*MAX_PATH];
 		int len;
 
-		len = strlen(name);
-		strcpy(buffer, name);
-		if (buffer[0] && buffer[len-1] != '\\' && buffer[len-1] != '/') {
-		    strcat(buffer, "\\");
+		len = wcslen(wname);
+		wcscpy(buffer, wname);
+		if (buffer[0] && buffer[len-1] != L'\\' && buffer[len-1] != L'/') {
+		    wcscat(buffer, L"\\");
 		}
-		strcat(buffer, "*.*");
-		handle = FindFirstFile(buffer, &data);
+		wcscat(buffer, L"*.*");
+		handle = FindFirstFileW(buffer, &data);
 		if (handle != INVALID_HANDLE_VALUE) {
 		    while (1) {
-			if ((strcmp(data.cFileName, ".") != 0)
-				&& (strcmp(data.cFileName, "..") != 0)) {
+			if ((wcscmp(data.cFileName, L".") != 0)
+				&& (wcscmp(data.cFileName, L"..") != 0)) {
 			    /*
 			     * Found something in this directory.
 			     */
@@ -260,7 +259,7 @@ char* name;			/* Name of directory to delete. */
 			    errno = EEXIST;
 			    break;
 			}
-			if (FindNextFile(handle, &data) == FALSE) {
+			if (FindNextFileW(handle, &data) == FALSE) {
 			    break;
 			}
 		    }
@@ -284,19 +283,19 @@ char* name;			/* Name of directory to delete. */
 }
 
 int
-efile_delete_file(errInfo, name)
-Efile_error* errInfo;		/* Where to return error codes. */
-char* name;			/* Name of file to delete. */
+efile_delete_file(Efile_error* errInfo,		/* Where to return error codes. */
+		  char* name)			/* Name of file to delete. */
 {
     DWORD attr;
+    WCHAR *wname = (WCHAR *) name;
 
-    if (DeleteFile(name) != FALSE) {
+    if (DeleteFileW(wname) != FALSE) {
 	return 1;
     }
 
     errno = errno_map(GetLastError());
     if (errno == EACCES) {
-        attr = GetFileAttributes(name);
+        attr = GetFileAttributesW(wname);
 	if (attr != (DWORD) -1) {
 	    if (attr & FILE_ATTRIBUTE_DIRECTORY) {
 		/*
@@ -308,7 +307,7 @@ char* name;			/* Name of file to delete. */
 	    }
 	}
     } else if (errno == ENOENT) {
-        attr = GetFileAttributes(name);
+        attr = GetFileAttributesW(wname);
 	if (attr != (DWORD) -1) {
 	    if (attr & FILE_ATTRIBUTE_DIRECTORY) {
 	    	/*
@@ -362,20 +361,21 @@ char* name;			/* Name of file to delete. */
  */
 
 int
-efile_rename(errInfo, src, dst)
-Efile_error* errInfo;		/* Where to return error codes. */
-char* src;			/* Original name. */
-char* dst;			/* New name. */
+efile_rename(Efile_error* errInfo,	/* Where to return error codes. */
+	     char* src,			/* Original name. */
+	     char* dst)			/* New name. */
 {
     DWORD srcAttr, dstAttr;
+    WCHAR *wsrc = (WCHAR *) src;
+    WCHAR *wdst = (WCHAR *) dst;
     
-    if (MoveFile(src, dst) != FALSE) {
+    if (MoveFileW(wsrc, wdst) != FALSE) {
 	return 1;
     }
 
     errno = errno_map(GetLastError());
-    srcAttr = GetFileAttributes(src);
-    dstAttr = GetFileAttributes(dst);
+    srcAttr = GetFileAttributesW(wsrc);
+    dstAttr = GetFileAttributesW(wdst);
     if (srcAttr == (DWORD) -1) {
 	srcAttr = 0;
     }
@@ -390,22 +390,22 @@ char* dst;			/* New name. */
     if (errno == EACCES) {
 	decode:
 	if (srcAttr & FILE_ATTRIBUTE_DIRECTORY) {
-	    char srcPath[MAX_PATH], dstPath[MAX_PATH];
-	    char *srcRest, *dstRest;
+	    WCHAR srcPath[MAX_PATH], dstPath[MAX_PATH];
+	    WCHAR *srcRest, *dstRest;
 	    int size;
 
-	    size = GetFullPathName(src, sizeof(srcPath), srcPath, &srcRest);
-	    if ((size == 0) || (size > sizeof(srcPath))) {
+	    size = GetFullPathNameW(wsrc, MAX_PATH, srcPath, &srcRest);
+	    if ((size == 0) || (size > MAX_PATH)) {
 		return check_error(-1, errInfo);
 	    }
-	    size = GetFullPathName(dst, sizeof(dstPath), dstPath, &dstRest);
-	    if ((size == 0) || (size > sizeof(dstPath))) {
+	    size = GetFullPathNameW(wdst, MAX_PATH, dstPath, &dstRest);
+	    if ((size == 0) || (size > MAX_PATH)) {
 		return check_error(-1, errInfo);
 	    }
 	    if (srcRest == NULL) {
-		srcRest = srcPath + strlen(srcPath);
+		srcRest = srcPath + wcslen(srcPath);
 	    }
-	    if (strnicmp(srcPath, dstPath, srcRest - srcPath) == 0) {
+	    if (_wcsnicmp(srcPath, dstPath, srcRest - srcPath) == 0) {
 		/*
 		 * Trying to move a directory into itself.
 		 */
@@ -420,14 +420,14 @@ char* dst;			/* New name. */
 	    }
 
 	    (void) extract_root(dstPath);
-	    if (dstPath[0] == '\0') {
+	    if (dstPath[0] == L'\0') {
 		/*
 		 * The filename was invalid.  (Don't know why,
 		 * but play it safe.)
 		 */
 		errno = EINVAL;
 	    }
-	    if (stricmp(srcPath, dstPath) != 0) {
+	    if (_wcsicmp(srcPath, dstPath) != 0) {
 		/*
 		 * If src is a directory and dst filesystem != src
 		 * filesystem, errno should be EXDEV.  It is very
@@ -463,14 +463,14 @@ char* dst;			/* New name. */
 		 * fails, it's because it wasn't empty.
 		 */
 
-		if (RemoveDirectory(dst)) {
+		if (RemoveDirectoryW(wdst)) {
 		    /*
 		     * Now that that empty directory is gone, we can try
 		     * renaming again.  If that fails, we'll put this empty
 		     * directory back, for completeness.
 		     */
 
-		    if (MoveFile(src, dst) != FALSE) {
+		    if (MoveFileW(wsrc, wdst) != FALSE) {
 			return 1;
 		    }
 
@@ -480,8 +480,8 @@ char* dst;			/* New name. */
 		     */
 
 		    errno = errno_map(GetLastError());
-		    CreateDirectory(dst, NULL);
-		    SetFileAttributes(dst, dstAttr);
+		    CreateDirectoryW(wdst, NULL);
+		    SetFileAttributesW(wdst, dstAttr);
 		    if (errno == EACCES) {
 			/*
 			 * Decode the EACCES to a more meaningful error.
@@ -506,17 +506,17 @@ char* dst;			/* New name. */
 		 *    put temp file back to old name.
 		 */
 
-		char tempName[MAX_PATH];
+		WCHAR tempName[MAX_PATH];
 		int result, size;
-		char *rest;
+		WCHAR *rest;
 		
-		size = GetFullPathName(dst, sizeof(tempName), tempName, &rest);
-		if ((size == 0) || (size > sizeof(tempName)) || (rest == NULL)) {
+		size = GetFullPathNameW(wdst, MAX_PATH, tempName, &rest);
+		if ((size == 0) || (size > MAX_PATH) || (rest == NULL)) {
 		    return check_error(-1, errInfo);
 		}
-		*rest = '\0';
+		*rest = L'\0';
 		result = -1;
-		if (GetTempFileName(tempName, "erlr", 0, tempName) != 0) {
+		if (GetTempFileNameW(tempName, L"erlr", 0, tempName) != 0) {
 		    /*
 		     * Strictly speaking, need the following DeleteFile and
 		     * MoveFile to be joined as an atomic operation so no
@@ -524,15 +524,15 @@ char* dst;			/* New name. */
 		     * same temp file.
 		     */
 		     
-		    DeleteFile(tempName);
-		    if (MoveFile(dst, tempName) != FALSE) {
-			if (MoveFile(src, dst) != FALSE) {
-			    SetFileAttributes(tempName, FILE_ATTRIBUTE_NORMAL);
-			    DeleteFile(tempName);
+		    DeleteFileW(tempName);
+		    if (MoveFileW(wdst, tempName) != FALSE) {
+			if (MoveFileW(wsrc, wdst) != FALSE) {
+			    SetFileAttributesW(tempName, FILE_ATTRIBUTE_NORMAL);
+			    DeleteFileW(tempName);
 			    return 1;
 			} else {
-			    DeleteFile(dst);
-			    MoveFile(tempName, dst);
+			    DeleteFileW(wdst);
+			    MoveFileW(tempName, wdst);
 			}
 		    } 
 
@@ -558,11 +558,10 @@ char* dst;			/* New name. */
 }
 
 int
-efile_chdir(errInfo, name)
-Efile_error* errInfo;		/* Where to return error codes. */
-char* name;			/* Name of directory to make current. */
+efile_chdir(Efile_error* errInfo,	/* Where to return error codes. */
+	    char* name)			/* Name of directory to make current. */
 {
-    int success = check_error(chdir(name), errInfo);
+    int success = check_error(_wchdir((WCHAR *) name), errInfo);
     if (!success && errInfo->posix_errno == EINVAL)
 	/* POSIXification of errno */
 	errInfo->posix_errno = ENOENT;
@@ -570,59 +569,65 @@ char* name;			/* Name of directory to make current. */
 }
 
 int
-efile_getdcwd(errInfo, drive, buffer, size)
-Efile_error* errInfo;		/* Where to return error codes. */
-int drive;			/* 0 - current, 1 - A, 2 - B etc. */
-char* buffer;			/* Where to return the current directory. */
-size_t size;			/* Size of buffer. */
+efile_getdcwd(Efile_error* errInfo,		/* Where to return error codes. */
+	      int drive,			/* 0 - current, 1 - A, 2 - B etc. */
+	      char* buffer,			/* Where to return the current directory. */
+	      size_t size)			/* Size of buffer. */
 {
-    if (_getdcwd(drive, buffer, size) == NULL)
+    WCHAR *wbuffer = (WCHAR *) buffer;
+    size_t wbuffer_size = size / 2; 
+    if (_wgetdcwd(drive, wbuffer, wbuffer_size) == NULL)
 	return check_error(-1, errInfo);
-    for ( ; *buffer; buffer++) 
-	if (*buffer == '\\')
-	    *buffer = '/';
+    for ( ; *wbuffer; wbuffer++) 
+	if (*wbuffer == L'\\')
+	    *wbuffer = L'/';
     return 1;
 }
 
 int
-efile_readdir(errInfo, name, dir_handle, buffer, size)
-Efile_error* errInfo;		/* Where to return error codes. */
-char* name;			/* Name of directory to open. */
-EFILE_DIR_HANDLE* dir_handle;	/* Directory handle of open directory. */
-char* buffer;			/* Pointer to buffer for one filename. */
-size_t size;			/* Size of buffer. */
+efile_readdir(Efile_error* errInfo, /* Where to return error codes. */
+	      char* name,           /* Name of directory to list */
+	      EFILE_DIR_HANDLE* dir_handle, /* Handle of opened directory or NULL */
+	      char* buffer,                 /* Buffer to put one filename in */ 
+	      size_t *size)                 /* in-out size of buffer/size of filename excluding zero
+					       termination in bytes*/
 {
     HANDLE dir;			/* Handle to directory. */
-    char wildcard[MAX_PATH];	/* Wildcard to search for. */
-    WIN32_FIND_DATA findData;	/* Data found by FindFirstFile() or FindNext(). */
+    WCHAR wildcard[MAX_PATH];	/* Wildcard to search for. */
+    WIN32_FIND_DATAW findData;	/* Data found by FindFirstFile() or FindNext(). */
+    /* Alignment is not honored, this works on x86 because of alignment fixup by processor.
+       Not perfect, but faster than alinging by hand (really) */
+    WCHAR *wname = (WCHAR *) name;
+    WCHAR *wbuffer = (WCHAR *) buffer;
 
     /*
      * First time we must setup everything.
      */
 
     if (*dir_handle == NULL) {
-	int length = strlen(name);
-	char* s;
+	int length = wcslen(wname);
+	WCHAR* s;
 
 	if (length+3 >= MAX_PATH) {
 	    errno = ENAMETOOLONG;
 	    return check_error(-1, errInfo);
 	}
 
-	strcpy(wildcard, name);
+	wcscpy(wildcard, wname);
 	s = wildcard+length-1;
-	if (*s != '/' && *s != '\\')
-	    *++s = '\\';
-	*++s = '*';
-	*++s = '\0';
-	DEBUGF(("Reading %s\n", wildcard));
-	dir = FindFirstFile(wildcard, &findData);
+	if (*s != L'/' && *s != L'\\')
+	    *++s = L'\\';
+	*++s = L'*';
+	*++s = L'\0';
+	DEBUGF(("Reading %ws\n", wildcard));
+	dir = FindFirstFileW(wildcard, &findData);
 	if (dir == INVALID_HANDLE_VALUE)
 	    return set_error(errInfo);
 	*dir_handle = (EFILE_DIR_HANDLE) dir;
 
 	if (!IS_DOT_OR_DOTDOT(findData.cFileName)) {
-	    strcpy(buffer, findData.cFileName);
+	    wcscpy(wbuffer, findData.cFileName);
+	    *size = wcslen(wbuffer)*2;
 	    return 1;
 	}
     }
@@ -635,10 +640,11 @@ size_t size;			/* Size of buffer. */
     dir = (HANDLE) *dir_handle;
 
     for (;;) {
-	if (FindNextFile(dir, &findData)) {
+	if (FindNextFileW(dir, &findData)) {
 	    if (IS_DOT_OR_DOTDOT(findData.cFileName))
 		continue;
-	    strcpy(buffer, findData.cFileName);
+	    wcscpy(wbuffer, findData.cFileName);
+	    *size = wcslen(wbuffer)*2;
 	    return 1;
 	}
 
@@ -655,17 +661,17 @@ size_t size;			/* Size of buffer. */
 }
 
 int
-efile_openfile(errInfo, name, flags, pfd, pSize)
-Efile_error* errInfo;		/* Where to return error codes. */
-char* name;			/* Name of directory to open. */
-int flags;			/* Flags to use for opening. */
-int* pfd;			/* Where to store the file descriptor. */
-Sint64* pSize;			/* Where to store the size of the file. */
+efile_openfile(Efile_error* errInfo,		/* Where to return error codes. */
+	       char* name,			/* Name of directory to open. */
+	       int flags,			/* Flags to use for opening. */
+	       int* pfd,			/* Where to store the file descriptor. */
+	       Sint64* pSize)			/* Where to store the size of the file. */
 {
     BY_HANDLE_FILE_INFORMATION fileInfo; /* File information from a handle. */
     HANDLE fd;			/* Handle to open file. */
     DWORD access;		/* Access mode: GENERIC_READ, GENERIC_WRITE. */
     DWORD crFlags;
+    WCHAR *wname = (WCHAR *) name;
 
     switch (flags & (EFILE_MODE_READ|EFILE_MODE_WRITE)) {
     case EFILE_MODE_READ:
@@ -692,7 +698,7 @@ Sint64* pSize;			/* Where to store the size of the file. */
     if (flags & EFILE_MODE_EXCL) {
 	crFlags = CREATE_NEW;
     }
-    fd = CreateFile(name, access,
+    fd = CreateFileW(wname, access,
 		    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 		    NULL, crFlags, FILE_ATTRIBUTE_NORMAL, NULL);
 
@@ -711,7 +717,7 @@ Sint64* pSize;			/* Where to store the size of the file. */
 	 * to EISDIR.
 	 */
 	if (errInfo->posix_errno && 
-	    (attr = GetFileAttributes(name)) != INVALID_FILE_ATTRIBUTES && 
+	    (attr = GetFileAttributesW(wname)) != INVALID_FILE_ATTRIBUTES && 
 	    (attr & FILE_ATTRIBUTE_DIRECTORY)) {
 	    errInfo->posix_errno = EISDIR;
 	}
@@ -735,9 +741,10 @@ Sint64* pSize;			/* Where to store the size of the file. */
 
 int 
 efile_may_openfile(Efile_error* errInfo, char *name) {
+    WCHAR *wname = (WCHAR *) name;
     DWORD attr;
 
-    if ((attr = GetFileAttributes(name)) == INVALID_FILE_ATTRIBUTES) {
+    if ((attr = GetFileAttributesW(wname)) == INVALID_FILE_ATTRIBUTES) {
 	return check_error(-1, errInfo);
     }
 
@@ -746,18 +753,6 @@ efile_may_openfile(Efile_error* errInfo, char *name) {
 	return check_error(-1, errInfo);
     }
     return 1;
-#if 0
-    struct stat statbuf;
-    
-    if (stat(name, &statbuf)) {
-	return check_error(-1, errInfo);
-    }
-    if (ISDIR(statbuf)) {
-	errno = EISDIR;
-	return check_error(-1, errInfo);
-    }
-    return 1;
-#endif
 }
 
 void
@@ -792,16 +787,17 @@ efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo,
 	       char* orig_name, int info_for_link)
 {
     HANDLE findhandle;		/* Handle returned by FindFirstFile(). */
-    WIN32_FIND_DATA findbuf;	/* Data return by FindFirstFile(). */
-    char name[_MAX_PATH];
+    WIN32_FIND_DATAW findbuf;	/* Data return by FindFirstFile(). */
+    WCHAR name[_MAX_PATH];
     int name_len;
-    char* path;
-    char pathbuf[_MAX_PATH];
+    WCHAR *path;
+    WCHAR pathbuf[_MAX_PATH];
     int drive;			/* Drive for filename (1 = A:, 2 = B: etc). */
+    WCHAR *worig_name = (WCHAR *) orig_name; 
 
     /* Don't allow wildcards to be interpreted by system */
 
-    if (strpbrk(orig_name, "?*")) {
+    if (wcspbrk(worig_name, L"?*")) {
     enoent:
 	errInfo->posix_errno = ENOENT;
 	errInfo->os_errno = ERROR_FILE_NOT_FOUND;
@@ -813,25 +809,25 @@ efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo,
      * slash, because it causes FindFirstFile() to fail on Win95.
      */
 
-    if ((name_len = strlen(orig_name)) >= _MAX_PATH) {
+    if ((name_len = wcslen(worig_name)) >= _MAX_PATH) {
 	goto enoent;
     } else {
-	strcpy(name, orig_name);
+	wcscpy(name, worig_name);
 	if (name_len > 2 && ISSLASH(name[name_len-1]) &&
-	    name[name_len-2] != ':') {
-	    name[name_len-1] = '\0';
+	    name[name_len-2] != L':') {
+	    name[name_len-1] = L'\0';
 	}
     }
     
     /* Try to get disk from name.  If none, get current disk.  */
 
-    if (name[1] != ':') {
+    if (name[1] != L':') {
         drive = 0;
-        if (GetCurrentDirectory(sizeof(pathbuf), pathbuf) &&
-	    pathbuf[1] == ':') {
-	    drive = tolower(pathbuf[0]) - 'a' + 1;
+        if (GetCurrentDirectoryW(_MAX_PATH, pathbuf) &&
+	    pathbuf[1] == L':') {
+	    drive = towlower(pathbuf[0]) - L'a' + 1;
 	}
-    } else if (*name && name[2] == '\0') {
+    } else if (*name && name[2] == L'\0') {
 	/*
 	 * X: and nothing more is an error.
 	 */
@@ -839,15 +835,15 @@ efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo,
 	errInfo->os_errno = ERROR_FILE_NOT_FOUND;
 	return 0;
     } else
-        drive = tolower(*name) - 'a' + 1;
+        drive = towlower(*name) - L'a' + 1;
 
-    findhandle = FindFirstFile(name, &findbuf);
+    findhandle = FindFirstFileW(name, &findbuf);
     if (findhandle == INVALID_HANDLE_VALUE) {
-        if (!(strpbrk(name, "./\\") &&
-	      (path = _fullpath(pathbuf, name, _MAX_PATH)) &&
+        if (!(wcspbrk(name, L"./\\") &&
+	      (path = _wfullpath(pathbuf, name, _MAX_PATH)) &&
 	      /* root dir. ('C:\') or UNC root dir. ('\\server\share\') */
-	      ((strlen(path) == 3) || IsRootUNCName(path)) &&
-	      (GetDriveType(path) > 1)   ) ) {
+	      ((wcslen(path) == 3) || is_root_unc_name(path)) &&
+	      (GetDriveTypeW(path) > 1)   ) ) {
 	    errInfo->posix_errno = ENOENT;
 	    errInfo->os_errno = ERROR_FILE_NOT_FOUND;
 	    return 0;
@@ -860,7 +856,7 @@ efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo,
         findbuf.dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY;
         findbuf.nFileSizeHigh = 0;
         findbuf.nFileSizeLow = 0;
-        findbuf.cFileName[0] = '\0';
+        findbuf.cFileName[0] = L'\0';
 
 	pInfo->links = 1;
 	pInfo->modifyTime.year = 1980;
@@ -960,10 +956,9 @@ if (!FileTimeToLocalFileTime(&findbuf.src, &LocalFTime) || \
 }
 
 int
-efile_write_info(errInfo, pInfo, name)
-Efile_error* errInfo;
-Efile_info* pInfo;
-char* name;
+efile_write_info(Efile_error* errInfo,
+		 Efile_info* pInfo,
+		 char* name)
 {
     SYSTEMTIME timebuf;
     FILETIME LocalFileTime;
@@ -977,12 +972,13 @@ char* name;
     DWORD attr;
     DWORD tempAttr;
     BOOL modifyTime = FALSE;
+    WCHAR *wname = (WCHAR *) name;
 
     /*
      * Get the attributes for the file.
      */
 
-    tempAttr = attr = GetFileAttributes((LPTSTR)name);
+    tempAttr = attr = GetFileAttributesW(wname);
     if (attr == 0xffffffff) {
 	return set_error(errInfo);
     }
@@ -1036,12 +1032,12 @@ char* name;
 
 	if (tempAttr & FILE_ATTRIBUTE_READONLY) {
 	    tempAttr &= ~FILE_ATTRIBUTE_READONLY;
-	    if (!SetFileAttributes((LPTSTR) name, tempAttr)) {
+	    if (!SetFileAttributesW(wname, tempAttr)) {
 		return set_error(errInfo);
 	    }
 	}
 
-	fd = CreateFile(name, GENERIC_READ|GENERIC_WRITE,
+	fd = CreateFileW(wname, GENERIC_READ|GENERIC_WRITE,
 			FILE_SHARE_READ | FILE_SHARE_WRITE,
 			NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
 	if (fd != INVALID_HANDLE_VALUE) {
@@ -1059,7 +1055,7 @@ char* name;
      */
 
     if (tempAttr != attr) {
-	if (!SetFileAttributes((LPTSTR) name, attr)) {
+	if (!SetFileAttributesW(wname, attr)) {
 	    return set_error(errInfo);
 	}
     }
@@ -1235,7 +1231,7 @@ int flags;
 
 
 /*
- * IsRootUNCName - returns TRUE if the argument is a UNC name specifying
+ * is_root_unc_name - returns TRUE if the argument is a UNC name specifying
  *      a root share.  That is, if it is of the form \\server\share\.
  *      This routine will also return true if the argument is of the
  *      form \\server\share (no trailing slash) but Win32 currently
@@ -1245,16 +1241,16 @@ int flags;
  */
 
 static int
-IsRootUNCName(const char* path)
+is_root_unc_name(const WCHAR *path)
 {
     /*
      * If a root UNC name, path will start with 2 (but not 3) slashes
      */
 
-    if ((strlen(path) >= 5) /* minimum string is "//x/y" */
+    if ((wcslen(path) >= 5) /* minimum string is "//x/y" */
 	&& ISSLASH(path[0]) && ISSLASH(path[1]))
     {
-        const char * p = path + 2 ;
+        const WCHAR *p = path + 2;
 
         /*
          * find the slash between the server name and share name
@@ -1297,19 +1293,19 @@ IsRootUNCName(const char* path)
  */
 
 static int
-extract_root(char* name)
+extract_root(WCHAR* name)
 {
-    int len = strlen(name);
+    int len = wcslen(name);
 
-    if (isalpha(name[0]) && name[1] == ':' && ISSLASH(name[2])) {
-	int c = name[3];
-	name[3] = '\0';
-	return c == '\0';
+    if (iswalpha(name[0]) && name[1] == L':' && ISSLASH(name[2])) {
+	WCHAR c = name[3];
+	name[3] = L'\0';
+	return c == L'\0';
     } else if (len < 5 || !ISSLASH(name[0]) || !ISSLASH(name[1])) {
 	goto error;
     } else {			/* Try to find the end of the UNC name. */
-	char* p;
-	int c;
+	WCHAR* p;
+	WCHAR c;
 
         /*
          * Find the slash between the server name and share name.
@@ -1318,7 +1314,7 @@ extract_root(char* name)
 	for (p = name + 2; *p; p++)
             if (ISSLASH(*p))
                 break;
-	if (*p == '\0')
+	if (*p == L'\0')
 	    goto error;
 
 	/*
@@ -1329,24 +1325,24 @@ extract_root(char* name)
             if (ISSLASH(*p))
                 break;
 	c = *p;
-	*p = '\0';
-	return c == '\0' || p[1] == '\0';
+	*p = L'\0';
+	return c == L'\0' || p[1] == L'\0';
     }
 
  error:
-    *name = '\0';
+    *name = L'\0';
     return 1;
 }
 
 static unsigned short
-dos_to_posix_mode(int attr, const char *name)
+dos_to_posix_mode(int attr, const WCHAR *name)
 {
     register unsigned short uxmode;
     unsigned dosmode;
-    register const char *p;
+    register const WCHAR *p;
 
     dosmode = attr & 0xff;
-    if ((p = name)[1] == ':')
+    if ((p = name)[1] == L':')
 	p += 2;
 
     /* check to see if this is a directory - note we must make a special
@@ -1355,7 +1351,7 @@ dos_to_posix_mode(int attr, const char *name)
 
     uxmode = (unsigned short)
 	(((ISSLASH(*p) && !p[1]) || (dosmode & FILE_ATTRIBUTE_DIRECTORY) ||
-	       *p == '\0') ? _S_IFDIR|_S_IEXEC : _S_IFREG);
+	       *p == L'\0') ? _S_IFDIR|_S_IEXEC : _S_IFREG);
 
     /* If attribute byte does not have read-only bit, it is read-write */
 
@@ -1364,11 +1360,11 @@ dos_to_posix_mode(int attr, const char *name)
 
     /* see if file appears to be executable - check extension of name */
 
-    if (p = strrchr(name, '.')) {
-        if (!stricmp(p, ".exe") ||
-	    !stricmp(p, ".cmd") ||
-	    !stricmp(p, ".bat") ||
-	    !stricmp(p, ".com"))
+    if (p = wcsrchr(name, L'.')) {
+        if (!_wcsicmp(p, L".exe") ||
+	    !_wcsicmp(p, L".cmd") ||
+	    !_wcsicmp(p, L".bat") ||
+	    !_wcsicmp(p, L".com"))
             uxmode |= _S_IEXEC;
     }
 
@@ -1433,17 +1429,20 @@ efile_readlink(Efile_error* errInfo, char* name, char* buffer, size_t size)
 int
 efile_altname(Efile_error* errInfo, char* orig_name, char* buffer, size_t size)
 {
-    WIN32_FIND_DATA wfd;
+    WIN32_FIND_DATAW wfd;
     HANDLE fh;
-    char name[_MAX_PATH];
+    WCHAR name[_MAX_PATH+1];
     int name_len;
-    char* path;
-    char pathbuf[_MAX_PATH];
+    WCHAR* path;
+    WCHAR pathbuf[_MAX_PATH+1]; /* Unclear weather GetCurrentDirectory will access one char after
+				   _MAX_PATH */
+    WCHAR *worig_name = (WCHAR *) orig_name;
+    WCHAR *wbuffer = (WCHAR *) buffer;
     int drive;			/* Drive for filename (1 = A:, 2 = B: etc). */
 
     /* Don't allow wildcards to be interpreted by system */
 
-    if (strpbrk(orig_name, "?*")) {
+    if (wcspbrk(worig_name, L"?*")) {
     enoent:
 	errInfo->posix_errno = ENOENT;
 	errInfo->os_errno = ERROR_FILE_NOT_FOUND;
@@ -1455,57 +1454,61 @@ efile_altname(Efile_error* errInfo, char* orig_name, char* buffer, size_t size)
      * slash, because it causes FindFirstFile() to fail on Win95.
      */
 
-    if ((name_len = strlen(orig_name)) >= _MAX_PATH) {
+    if ((name_len = wcslen(worig_name)) >= _MAX_PATH) {
 	goto enoent;
     } else {
-	strcpy(name, orig_name);
+	wcscpy(name, worig_name);
 	if (name_len > 2 && ISSLASH(name[name_len-1]) &&
-	    name[name_len-2] != ':') {
-	    name[name_len-1] = '\0';
+	    name[name_len-2] != L':') {
+	    name[name_len-1] = L'\0';
 	}
     }
     
     /* Try to get disk from name.  If none, get current disk.  */
 
-    if (name[1] != ':') {
+    if (name[1] != L':') {
         drive = 0;
-        if (GetCurrentDirectory(sizeof(pathbuf), pathbuf) &&
-	    pathbuf[1] == ':') {
-	    drive = tolower(pathbuf[0]) - 'a' + 1;
+        if (GetCurrentDirectoryW(_MAX_PATH, pathbuf) &&
+	    pathbuf[1] == L':') {
+	    drive = towlower(pathbuf[0]) - L'a' + 1;
 	}
-    } else if (*name && name[2] == '\0') {
+    } else if (*name && name[2] == L'\0') {
 	/*
 	 * X: and nothing more is an error.
 	 */
 	goto enoent;
     } else {
-        drive = tolower(*name) - 'a' + 1;
+        drive = towlower(*name) - L'a' + 1;
     }
-    fh = FindFirstFile(name,&wfd);
+    fh = FindFirstFileW(name,&wfd);
     if (fh == INVALID_HANDLE_VALUE) {
-        if (!(strpbrk(name, "./\\") &&
-	      (path = _fullpath(pathbuf, name, _MAX_PATH)) &&
+        if (!(wcspbrk(name, L"./\\") &&
+	      (path = _wfullpath(pathbuf, name, _MAX_PATH)) &&
 	      /* root dir. ('C:\') or UNC root dir. ('\\server\share\') */
-	      ((strlen(path) == 3) || IsRootUNCName(path)) &&
-	      (GetDriveType(path) > 1)   ) ) {
+	      ((wcslen(path) == 3) || is_root_unc_name(path)) &&
+	      (GetDriveTypeW(path) > 1)   ) ) {
 	    errno = errno_map(GetLastError());
 	    return check_error(-1, errInfo);
 	}
         /*
          * Root directories (such as C:\ or \\server\share\ are fabricated.
          */
-	strcpy(buffer,name);
+	wcscpy(wbuffer,name);
 	return 1;
     }
 	
-    strcpy(buffer,wfd.cAlternateFileName);
-    if (!*buffer) {
-	strcpy(buffer,wfd.cFileName);
+    wcscpy(wbuffer,wfd.cAlternateFileName);
+    if (!*wbuffer) {
+	wcscpy(wbuffer,wfd.cFileName);
     }
 
     return 1;
 }
 
+/*
+ * XXX: link and symlink Implemented in pu (?), will need conversion
+ */
+
 int
 efile_link(Efile_error* errInfo, char* old, char* new)
 {
diff --git a/erts/emulator/sys/common/erl_sys_common_misc.c b/erts/emulator/sys/common/erl_sys_common_misc.c
index 581c14b6c6..7338ffc963 100644
--- a/erts/emulator/sys/common/erl_sys_common_misc.c
+++ b/erts/emulator/sys/common/erl_sys_common_misc.c
@@ -60,6 +60,7 @@ int erts_get_user_requested_filename_encoding(void)
 void erts_init_sys_common_misc(void)
 {
 #if defined(__WIN32__)
+    /* win_efile will totally fail if this is not set. */
     filename_encoding = ERL_FILENAME_WIN_WCHAR;
 #else
     if (user_filename_encoding != ERL_FILENAME_UNKNOWN) {