Re: `rename-file' with leading spaces in filename

[martin rudalics]

> Did you actually try that?  w32.c:sys_rename jumps through the hoops
> to work around the Windows 9X bugs related to aliases.  Perhaps it
> fails in this case, but it would be nice if you could step with a
> debugger through sys_rename and tell where the logic there fails.

I completely fail to understand the logic of this, hence you probably
have to tell me more precisely what to do (I didn't anticipate that this
special part of sys_rename would apply to Windows9_8_ at all).

Suppose my directory "c:/x" contains

FOOBAR~1                11  04.01.06   8:48 foo bar
FOOBAR~                 11  04.01.06   8:47 foo bar~
FOOBAR                  10  04.01.06   8:43 foobar

and I try to save some changes in a buffer visiting "foobar".

With `backup-by-copying' non-nil - my standard setting - saving doesn't
pass through sys_rename.  With `backup-by-copying' nil saving behaves in
a rather unpredictable way, I never bothered to find out why.  Anyway,
from a trace with sys_rename residing at line 2137 of w32.c I got the
following excerpts:


... line 2155:
oldname = 0x22f8af0 "c:/x/foobar"

... line 2178:
o = 0x12ead2d "foobar"
p = 0xd2d675 "foobar"
i = 0
result = 33620403
temp = "c:\\x\\foobar\0\230×Ò\0׺ìÿ°ÖÒ\0\224ÖÒ\0\001\0\0\0\006\0\0\0\004\0\0\200\0\0\0\0\0\0\0\0Ø\032\a\001\0\0\0\0ÿ\v\003Àÿÿÿÿ\037\0\001", '\0' <repeats 25 times>, "\177\003ÿÿ \001ÿÿÿÿÿÿ", '\0' <repeats 14 times>, "ÿÿ", '\0' <repeats 46 
times>, "\200Æ\b@", '\0' <repeats 12 times>, "@\237jïØÎ7@<'address@hidden"\002³\001\001\002Ð\001\001\002\220\001\001\002\0\0\0\0\230×Ò\0Ø\032\a\001\177\001\0\0F"...
oldname = 0x12ead28 "c:\\x\\foobar"

... line 2179:
o = 0x12ead2d "foobar"
p = 0xd2d675 "_.foobar.0"
i = 0
result = 33620403
temp = "c:\\x\\_.foobar.0\0׺ìÿ°ÖÒ\0\224ÖÒ\0\001\0\0\0\006\0\0\0\004\0\0\200\0\0\0\0\0\0\0\0Ø\032\a\001\0\0\0\0ÿ\v\003Àÿÿÿÿ\037\0\001", '\0' <repeats 25 times>, "\177\003ÿÿ \001ÿÿÿÿÿÿ", '\0' <repeats 14 times>, "ÿÿ", '\0' <repeats 46 
times>, "\200Æ\b@", '\0' <repeats 12 times>, "@\237jïØÎ7@<'address@hidden"\002³\001\001\002Ð\001\001\002\220\001\001\002\0\0\0\0\230×Ò\0Ø\032\a\001\177\001\0\0F"...
oldname = 0x12ead28 "c:\\x\\foobar"

... line 2199:
result = 33620403
temp = "c:\\x\\_.foobar.0\0׺ìÿ°ÖÒ\0\224ÖÒ\0\001\0\0\0\006\0\0\0\004\0\0\200\0\0\0\0\0\0\0\0Ø\032\a\001\0\0\0\0ÿ\v\003Àÿÿÿÿ\037\0\001", '\0' <repeats 25 times>, "\177\003ÿÿ \001ÿÿÿÿÿÿ", '\0' <repeats 14 times>, "ÿÿ", '\0' <repeats 46 
times>, "\200Æ\b@", '\0' <repeats 12 times>, "@\237jïØÎ7@<'address@hidden"\002³\001\001\002Ð\001\001\002\220\001\001\002\0\0\0\0\230×Ò\0Ø\032\a\001\177\001\0\0F"...
oldname = 0x12ead28 "c:\\x\\foobar"


Regardless of how `backup-by-copying' is set, "foo bar~" doesn't exist
any more after this:

FOOBAR~1                11  04.01.06   8:48 foo bar
FOOBAR~                 10  04.01.06   8:43 foobar~
FOOBAR                  10  04.01.06   8:56 foobar