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Document why we only handle trailing "..".

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This commit is contained in:
Bruce Momjian 2005-08-12 02:48:37 +00:00
parent 721e53785d
commit 6effc19d9c
1 changed files with 8 additions and 2 deletions
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10
src/port/path.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/port/path.c,v 1.52 2005/08/11 03:53:25 momjian Exp $
* $PostgreSQL: pgsql/src/port/path.c,v 1.53 2005/08/12 02:48:37 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -284,7 +284,13 @@ canonicalize_path(char *path)
if (len > 2 && strcmp(path + len - 2, "/.") == 0)
trim_directory(path);
/* We can only deal with "/usr/local/..", not "/usr/local/../.." */
/*
* Process only a single trailing "..", and only if ".." does
* not preceed it.
* So, we only deal with "/usr/local/..", not with "/usr/local/../..".
* We don't handle the even more complex cases, like
* "usr/local/../../.." and "usr/local/../bin/../..".
*/
else if (len > 3 && strcmp(path + len - 3, "/..") == 0 &&
(len != 5 || strcmp(path, "../..") != 0) &&
(len < 6 || strcmp(path + len - 6, "/../..") != 0))