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Rewrote the collapsing of . and .. in RtlGetFullPathName_U for better 

compatibility.
This commit is contained in:
Alexandre Julliard 2004-03-17 01:58:51 +00:00
parent cfc5d57122
commit b8d025eeb9
1 changed files with 75 additions and 43 deletions
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116
dlls/ntdll/path.c
View File

@ -316,6 +316,62 @@ ULONG WINAPI RtlDosSearchPath_U(LPCWSTR paths, LPCWSTR search, LPCWSTR ext,
return len;
}
/******************************************************************
* collapse_path
*
* Helper for RtlGetFullPathName_U.
* Get rid of . and .. components in the path.
*/
static inline void collapse_path( WCHAR *path )
{
WCHAR *p, *next;
p = path;
while (*p)
{
if (*p == '.')
{
switch(p[1])
{
case '\\': /* .\ component */
next = p + 2;
while (*next == '\\') next++;
memmove( p, next, (strlenW(next) + 1) * sizeof(WCHAR) );
continue;
case 0: /* final . */
while (p > path && p[-1] == '\\') p--;
*p = 0;
continue;
case '.':
if (p[2] == '\\') /* ..\ component */
{
next = p + 3;
while (*next == '\\') next++;
while (p > path && p[-1] == '\\') p--;
while (p > path && p[-1] != '\\') p--;
memmove( p, next, (strlenW(next) + 1) * sizeof(WCHAR) );
continue;
}
else if (!p[2]) /* final .. */
{
while (p > path && p[-1] == '\\') p--;
while (p > path && p[-1] != '\\') p--;
while (p > path && p[-1] == '\\') p--;
*p = 0;
continue;
}
break;
}
}
/* skip to the next component */
while (*p && *p != '\\') p++;
while (*p == '\\') p++;
}
}
/******************************************************************
* get_full_path_helper
*
@ -326,7 +382,8 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
{
ULONG reqsize = 0, mark = 0, dep = 0, deplen;
DOS_PATHNAME_TYPE type;
LPWSTR ptr, ins_str = NULL;
LPWSTR p, ins_str = NULL;
LPCWSTR ptr;
const UNICODE_STRING* cd;
WCHAR tmp[4];
@ -337,7 +394,15 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
switch (type = RtlDetermineDosPathNameType_U(name))
{
case UNC_PATH: /* \\foo */
ptr = name + 2;
while (*ptr && !IS_SEPARATOR(*ptr)) ptr++; /* share name */
while (*ptr && IS_SEPARATOR(*ptr)) ptr++;
while (*ptr && !IS_SEPARATOR(*ptr)) ptr++; /* dir name */
mark = (ptr - name);
break;
case DEVICE_PATH: /* \\.\foo */
mark = 4;
break;
case ABSOLUTE_DRIVE_PATH: /* c:\foo */
@ -345,6 +410,7 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
tmp[0] = toupperW(name[0]);
ins_str = tmp;
dep = 1;
mark = 3;
break;
case RELATIVE_DRIVE_PATH: /* c:foo */
@ -389,6 +455,7 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
ERR("Unsupported status code\n");
break;
}
mark = 3;
break;
}
/* fall through */
@ -403,6 +470,7 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
if (!ptr) ptr = cd->Buffer + strlenW(cd->Buffer);
mark = ptr - cd->Buffer;
}
else mark = 3;
break;
case ABSOLUTE_PATH: /* \xxx */
@ -412,6 +480,7 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
tmp[0] = cd->Buffer[0];
tmp[1] = ':';
ins_str = tmp;
mark = 3;
}
else
{
@ -432,6 +501,7 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
tmp[2] = '.';
tmp[3] = '\\';
ins_str = tmp;
mark = 4;
break;
case INVALID_PATH:
@ -455,48 +525,10 @@ static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
RtlFreeHeap(GetProcessHeap(), 0, ins_str);
/* convert every / into a \ */
for (ptr = buffer; *ptr; ptr++) if (*ptr == '/') *ptr = '\\';
for (p = buffer; *p; p++) if (*p == '/') *p = '\\';
/* mark is non NULL for UNC names, so start path collapsing after server & share name
* otherwise, it's a fully qualified DOS name, so start after the drive designation
*/
for (ptr = buffer + (mark ? mark : 2); ptr < buffer + reqsize / sizeof(WCHAR); )
{
LPWSTR prev, p = strchrW(ptr, '\\');
if (!p) break;
p++;
if (p[0] == '.')
{
switch (p[1])
{
case '.':
switch (p[2])
{
case '\\':
prev = p - 2;
while (prev >= buffer + mark && *prev != '\\') prev--;
/* either collapse \foo\.. into \ or \.. into \ */
if (prev < buffer + mark) prev = p - 1;
reqsize -= (p + 2 - prev) * sizeof(WCHAR);
memmove(prev, p + 2, reqsize + sizeof(WCHAR) - (prev - buffer) * sizeof(WCHAR));
p = prev;
break;
case '\0':
reqsize -= 2 * sizeof(WCHAR);
*p = 0;
break;
}
break;
case '\\':
reqsize -= 2 * sizeof(WCHAR);
memmove(p, p + 2, reqsize + sizeof(WCHAR) - (p - buffer) * sizeof(WCHAR));
break;
}
}
ptr = p;
}
collapse_path( buffer + mark );
reqsize = strlenW(buffer) * sizeof(WCHAR);
done:
RtlReleasePebLock();