diff options
| -rw-r--r-- | src/port/path.c | 52 |
1 files changed, 24 insertions, 28 deletions
diff --git a/src/port/path.c b/src/port/path.c index 6991bc7247b..89878c94b05 100644 --- a/src/port/path.c +++ b/src/port/path.c @@ -159,6 +159,8 @@ make_native_path(char *filename) /* * join_path_components - join two path components, inserting a slash * + * We omit the slash if either given component is empty. + * * ret_path is the output area (must be of size MAXPGPATH) * * ret_path can be the same as head, but not the same as tail. @@ -171,37 +173,22 @@ join_path_components(char *ret_path, strlcpy(ret_path, head, MAXPGPATH); /* - * Remove any leading "." and ".." in the tail component, adjusting head - * as needed. + * Remove any leading "." in the tail component. + * + * Note: we used to try to remove ".." as well, but that's tricky to get + * right; now we just leave it to be done by canonicalize_path() later. */ - for (;;) - { - if (tail[0] == '.' && IS_DIR_SEP(tail[1])) - { - tail += 2; - } - else if (tail[0] == '.' && tail[1] == '\0') - { - tail += 1; - break; - } - else if (tail[0] == '.' && tail[1] == '.' && IS_DIR_SEP(tail[2])) - { - trim_directory(ret_path); - tail += 3; - } - else if (tail[0] == '.' && tail[1] == '.' && tail[2] == '\0') - { - trim_directory(ret_path); - tail += 2; - break; - } - else - break; - } + while (tail[0] == '.' && IS_DIR_SEP(tail[1])) + tail += 2; + if (*tail) + { + /* only separate with slash if head wasn't empty */ snprintf(ret_path + strlen(ret_path), MAXPGPATH - strlen(ret_path), - "/%s", tail); + "%s%s", + (*(skip_drive(head)) != '\0') ? "/" : "", + tail); + } } @@ -693,6 +680,15 @@ get_home_path(char *ret_path) * * Modify the given string in-place to name the parent directory of the * named file. + * + * If the input is just a file name with no directory part, the result is + * an empty string, not ".". This is appropriate when the next step is + * join_path_components(), but might need special handling otherwise. + * + * Caution: this will not produce desirable results if the string ends + * with "..". For most callers this is not a problem since the string + * is already known to name a regular file. If in doubt, apply + * canonicalize_path() first. */ void get_parent_directory(char *path) |