diff --git a/doc/us/manual.html b/doc/us/manual.html
index 86c3406..4dc15bb 100644
--- a/doc/us/manual.html
+++ b/doc/us/manual.html
@@ -242,6 +242,8 @@ LuaFileSystem offers the following functions:
lfs.symlinkattributes (filepath [, aname])
Identical to lfs.attributes except that
it obtains information about the link itself (not the file it refers to).
+ It also adds a target field, containing
+ the file name that the symlink points to.
On Windows this function does not yet support links, and is identical to
lfs.attributes.
diff --git a/src/lfs.c b/src/lfs.c
index 446373c..49a8534 100644
--- a/src/lfs.c
+++ b/src/lfs.c
@@ -849,11 +849,73 @@ static int file_info (lua_State *L) {
}
+/*
+** Push the symlink target to the top of the stack.
+** Assumes the file name is at position 1 of the stack.
+** Returns 1 if successful (with the target on top of the stack),
+** 0 on failure (with stack unchanged, and errno set).
+*/
+static int push_link_target(lua_State *L) {
+#ifdef _WIN32
+ errno = ENOSYS;
+ return 0;
+#else
+ const char *file = luaL_checkstring(L, 1);
+ char *target;
+ int size, tsize;
+ if (lua_type(L, -1) == LUA_TTABLE) {
+ /* when symlinkattributes collects the whole table,
+ get the size from it */
+ int size_type = lua_getfield(L, -1, "size");
+ if (size_type != LUA_TNUMBER) {
+ lua_pop(L, 1);
+ errno = EINVAL;
+ return 0;
+ }
+ size = lua_tointeger(L, -1);
+ lua_pop(L, 1);
+ } else {
+ /* when we are just getting 'target', we need to run
+ lstat ourselves to get the size */
+ STAT_STRUCT info;
+ if (LSTAT_FUNC(file, &info)) {
+ return 0;
+ }
+ size = info.st_size;
+ }
+ target = (char*) malloc(size + 1);
+ if (!target) {
+ return 0;
+ }
+ tsize = readlink(file, target, size);
+ if (tsize != size) {
+ free(target);
+ return 0;
+ }
+ target[tsize] = '\0';
+ lua_pushlstring(L, target, tsize);
+ free(target);
+ return 1;
+#endif
+}
+
/*
** Get symbolic link information using lstat.
*/
static int link_info (lua_State *L) {
- return _file_info_ (L, LSTAT_FUNC);
+ int ret;
+ if (lua_isstring (L, 2) && (strcmp(lua_tostring(L, 2), "target") == 0)) {
+ int ok = push_link_target(L);
+ return ok ? 1 : pusherror(L, "could not obtain link target");
+ }
+ ret = _file_info_ (L, LSTAT_FUNC);
+ if (ret == 1 && lua_type(L, -1) == LUA_TTABLE) {
+ int ok = push_link_target(L);
+ if (ok) {
+ lua_setfield(L, -2, "target");
+ }
+ }
+ return ret;
}
diff --git a/tests/test.lua b/tests/test.lua
index 2842bc0..2331eec 100644
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -91,6 +91,8 @@ io.flush()
if lfs.link (tmpfile, "_a_link_for_test_", true) then
assert (lfs.attributes"_a_link_for_test_".mode == "file")
assert (lfs.symlinkattributes"_a_link_for_test_".mode == "link")
+ assert (lfs.symlinkattributes"_a_link_for_test_".target == tmpfile)
+ assert (lfs.symlinkattributes("_a_link_for_test_", "target") == tmpfile)
assert (lfs.link (tmpfile, "_a_hard_link_for_test_"))
assert (lfs.attributes (tmpfile, "nlink") == 2)
assert (os.remove"_a_link_for_test_")