(name, default_directory)
Lisp_Object name, default_directory;
{
- unsigned char *nm;
+ /* These point to SDATA and need to be careful with string-relocation
+ during GC (via DECODE_FILE). */
+ unsigned char *nm, *newdir;
+ /* This should only point to alloca'd data. */
+ unsigned char *target;
- register unsigned char *newdir, *p, *o;
int tlen;
- unsigned char *target;
struct passwd *pw;
#ifdef VMS
unsigned char * colon = 0;
return call3 (handler, Qexpand_file_name, name, default_directory);
}
- o = SDATA (default_directory);
-
- /* Make sure DEFAULT_DIRECTORY is properly expanded.
- It would be better to do this down below where we actually use
- default_directory. Unfortunately, calling Fexpand_file_name recursively
- could invoke GC, and the strings might be relocated. This would
- be annoying because we have pointers into strings lying around
- that would need adjusting, and people would add new pointers to
- the code and forget to adjust them, resulting in intermittent bugs.
- Putting this call here avoids all that crud.
-
- The EQ test avoids infinite recursion. */
- if (! NILP (default_directory) && !EQ (default_directory, name)
- /* Save time in some common cases - as long as default_directory
- is not relative, it can be canonicalized with name below (if it
- is needed at all) without requiring it to be expanded now. */
+ {
+ unsigned char *o = SDATA (default_directory);
+
+ /* Make sure DEFAULT_DIRECTORY is properly expanded.
+ It would be better to do this down below where we actually use
+ default_directory. Unfortunately, calling Fexpand_file_name recursively
+ could invoke GC, and the strings might be relocated. This would
+ be annoying because we have pointers into strings lying around
+ that would need adjusting, and people would add new pointers to
+ the code and forget to adjust them, resulting in intermittent bugs.
+ Putting this call here avoids all that crud.
+
+ The EQ test avoids infinite recursion. */
+ if (! NILP (default_directory) && !EQ (default_directory, name)
+ /* Save time in some common cases - as long as default_directory
+ is not relative, it can be canonicalized with name below (if it
+ is needed at all) without requiring it to be expanded now. */
#ifdef DOS_NT
- /* Detect MSDOS file names with drive specifiers. */
- && ! (IS_DRIVE (o[0]) && IS_DEVICE_SEP (o[1]) && IS_DIRECTORY_SEP (o[2]))
+ /* Detect MSDOS file names with drive specifiers. */
+ && ! (IS_DRIVE (o[0]) && IS_DEVICE_SEP (o[1])
+ && IS_DIRECTORY_SEP (o[2]))
#ifdef WINDOWSNT
- /* Detect Windows file names in UNC format. */
- && ! (IS_DIRECTORY_SEP (o[0]) && IS_DIRECTORY_SEP (o[1]))
+ /* Detect Windows file names in UNC format. */
+ && ! (IS_DIRECTORY_SEP (o[0]) && IS_DIRECTORY_SEP (o[1]))
#endif
#else /* not DOS_NT */
/* Detect Unix absolute file names (/... alone is not absolute on
DOS or Windows). */
- && ! (IS_DIRECTORY_SEP (o[0]))
+ && ! (IS_DIRECTORY_SEP (o[0]))
#endif /* not DOS_NT */
- )
- {
- struct gcpro gcpro1;
-
- GCPRO1 (name);
- default_directory = Fexpand_file_name (default_directory, Qnil);
- UNGCPRO;
- }
+ )
+ {
+ struct gcpro gcpro1;
+ GCPRO1 (name);
+ default_directory = Fexpand_file_name (default_directory, Qnil);
+ UNGCPRO;
+ }
+ }
name = FILE_SYSTEM_CASE (name);
multibyte = STRING_MULTIBYTE (name);
if (multibyte != STRING_MULTIBYTE (default_directory))
"//somedir". */
if (drive && IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1]))
nm++;
-#endif /* WINDOWSNT */
-#endif /* DOS_NT */
-#ifdef WINDOWSNT
/* Discard any previous drive specifier if nm is now in UNC format. */
if (IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1]))
{
drive = 0;
}
-#endif
+#endif /* WINDOWSNT */
+#endif /* DOS_NT */
/* If nm is absolute, look for `/./' or `/../' or `//''sequences; if
none are found, we can probably return right away. We will avoid
non-zero value, that means we've discovered that we can't do
that cool trick. */
int lose = 0;
+ unsigned char *p = nm;
- p = nm;
while (*p)
{
/* Since we know the name is absolute, we can assume that each
tem = build_string (newdir);
if (!STRING_MULTIBYTE (tem))
{
+ /* FIXME: DECODE_FILE may GC, which may move SDATA(name),
+ after which `nm' won't point to the right place any more. */
+ int offset = nm - SDATA (name);
hdir = DECODE_FILE (tem);
newdir = SDATA (hdir);
+ nm = SDATA (name) + offset;
}
#ifdef DOS_NT
collapse_newdir = 0;
}
else /* ~user/filename */
{
+ unsigned char *o, *p;
for (p = nm; *p && (!IS_DIRECTORY_SEP (*p)
#ifdef VMS
&& *p != ':'
#endif /* VMS */
); p++);
- o = (unsigned char *) alloca (p - nm + 1);
+ o = alloca (p - nm + 1);
bcopy ((char *) nm, o, p - nm);
o [p - nm] = 0;
/* Now canonicalize by removing `//', `/.' and `/foo/..' if they
appear. */
- p = target;
- o = target;
+ {
+ unsigned char *p = target;
+ unsigned char *o = target;
- while (*p)
- {
+ while (*p)
+ {
#ifdef VMS
- if (*p != ']' && *p != '>' && *p != '-')
- {
- if (*p == '\\')
- p++;
- *o++ = *p++;
- }
- else if ((p[0] == ']' || p[0] == '>') && p[0] == p[1] + 2)
- /* brackets are offset from each other by 2 */
- {
- p += 2;
- if (*p != '.' && *p != '-' && o[-1] != '.')
- /* convert [foo][bar] to [bar] */
- while (o[-1] != '[' && o[-1] != '<')
- o--;
- else if (*p == '-' && *o != '.')
- *--p = '.';
- }
- else if (p[0] == '-' && o[-1] == '.'
- && (p[1] == '.' || p[1] == ']' || p[1] == '>'))
- /* flush .foo.- ; leave - if stopped by '[' or '<' */
- {
- do
- o--;
- while (o[-1] != '.' && o[-1] != '[' && o[-1] != '<');
- if (p[1] == '.') /* foo.-.bar ==> bar. */
+ if (*p != ']' && *p != '>' && *p != '-')
+ {
+ if (*p == '\\')
+ p++;
+ *o++ = *p++;
+ }
+ else if ((p[0] == ']' || p[0] == '>') && p[0] == p[1] + 2)
+ /* brackets are offset from each other by 2 */
+ {
p += 2;
- else if (o[-1] == '.') /* '.foo.-]' ==> ']' */
- p++, o--;
- /* else [foo.-] ==> [-] */
- }
- else
- {
+ if (*p != '.' && *p != '-' && o[-1] != '.')
+ /* convert [foo][bar] to [bar] */
+ while (o[-1] != '[' && o[-1] != '<')
+ o--;
+ else if (*p == '-' && *o != '.')
+ *--p = '.';
+ }
+ else if (p[0] == '-' && o[-1] == '.'
+ && (p[1] == '.' || p[1] == ']' || p[1] == '>'))
+ /* flush .foo.- ; leave - if stopped by '[' or '<' */
+ {
+ do
+ o--;
+ while (o[-1] != '.' && o[-1] != '[' && o[-1] != '<');
+ if (p[1] == '.') /* foo.-.bar ==> bar. */
+ p += 2;
+ else if (o[-1] == '.') /* '.foo.-]' ==> ']' */
+ p++, o--;
+ /* else [foo.-] ==> [-] */
+ }
+ else
+ {
#ifdef NO_HYPHENS_IN_FILENAMES
- if (*p == '-'
- && o[-1] != '[' && o[-1] != '<' && o[-1] != '.'
- && p[1] != ']' && p[1] != '>' && p[1] != '.')
- *p = '_';
+ if (*p == '-'
+ && o[-1] != '[' && o[-1] != '<' && o[-1] != '.'
+ && p[1] != ']' && p[1] != '>' && p[1] != '.')
+ *p = '_';
#endif /* NO_HYPHENS_IN_FILENAMES */
- *o++ = *p++;
- }
+ *o++ = *p++;
+ }
#else /* not VMS */
- if (!IS_DIRECTORY_SEP (*p))
- {
- *o++ = *p++;
- }
- else if (p[1] == '.'
- && (IS_DIRECTORY_SEP (p[2])
- || p[2] == 0))
- {
- /* If "/." is the entire filename, keep the "/". Otherwise,
- just delete the whole "/.". */
- if (o == target && p[2] == '\0')
- *o++ = *p;
- p += 2;
- }
- else if (p[1] == '.' && p[2] == '.'
- /* `/../' is the "superroot" on certain file systems.
- Turned off on DOS_NT systems because they have no
- "superroot" and because this causes us to produce
- file names like "d:/../foo" which fail file-related
- functions of the underlying OS. (To reproduce, try a
- long series of "../../" in default_directory, longer
- than the number of levels from the root.) */
+ if (!IS_DIRECTORY_SEP (*p))
+ {
+ *o++ = *p++;
+ }
+ else if (p[1] == '.'
+ && (IS_DIRECTORY_SEP (p[2])
+ || p[2] == 0))
+ {
+ /* If "/." is the entire filename, keep the "/". Otherwise,
+ just delete the whole "/.". */
+ if (o == target && p[2] == '\0')
+ *o++ = *p;
+ p += 2;
+ }
+ else if (p[1] == '.' && p[2] == '.'
+ /* `/../' is the "superroot" on certain file systems.
+ Turned off on DOS_NT systems because they have no
+ "superroot" and because this causes us to produce
+ file names like "d:/../foo" which fail file-related
+ functions of the underlying OS. (To reproduce, try a
+ long series of "../../" in default_directory, longer
+ than the number of levels from the root.) */
#ifndef DOS_NT
- && o != target
+ && o != target
#endif
- && (IS_DIRECTORY_SEP (p[3]) || p[3] == 0))
- {
- while (o != target && (--o) && !IS_DIRECTORY_SEP (*o))
- ;
- /* Keep initial / only if this is the whole name. */
- if (o == target && IS_ANY_SEP (*o) && p[3] == 0)
- ++o;
- p += 3;
- }
- else if (p > target && IS_DIRECTORY_SEP (p[1]))
- /* Collapse multiple `/' in a row. */
- p++;
- else
- {
- *o++ = *p++;
- }
+ && (IS_DIRECTORY_SEP (p[3]) || p[3] == 0))
+ {
+ while (o != target && (--o) && !IS_DIRECTORY_SEP (*o))
+ ;
+ /* Keep initial / only if this is the whole name. */
+ if (o == target && IS_ANY_SEP (*o) && p[3] == 0)
+ ++o;
+ p += 3;
+ }
+ else if (p > target && IS_DIRECTORY_SEP (p[1]))
+ /* Collapse multiple `/' in a row. */
+ p++;
+ else
+ {
+ *o++ = *p++;
+ }
#endif /* not VMS */
- }
+ }
#ifdef DOS_NT
- /* At last, set drive name. */
+ /* At last, set drive name. */
#ifdef WINDOWSNT
- /* Except for network file name. */
- if (!(IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1])))
+ /* Except for network file name. */
+ if (!(IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1])))
#endif /* WINDOWSNT */
- {
- if (!drive) abort ();
- target -= 2;
- target[0] = DRIVE_LETTER (drive);
- target[1] = ':';
- }
- /* Reinsert the escape prefix if required. */
- if (is_escaped)
- {
- target -= 2;
- target[0] = '/';
- target[1] = ':';
- }
- CORRECT_DIR_SEPS (target);
+ {
+ if (!drive) abort ();
+ target -= 2;
+ target[0] = DRIVE_LETTER (drive);
+ target[1] = ':';
+ }
+ /* Reinsert the escape prefix if required. */
+ if (is_escaped)
+ {
+ target -= 2;
+ target[0] = '/';
+ target[1] = ':';
+ }
+ CORRECT_DIR_SEPS (target);
#endif /* DOS_NT */
- result = make_specified_string (target, -1, o - target, multibyte);
+ result = make_specified_string (target, -1, o - target, multibyte);
+ }
/* Again look to see if the file name has special constructs in it
and perhaps call the corresponding file handler. This is needed
projects / emacs.git / commitdiff