On 15 March 2010 12:03, Taco Hoekwater <[email protected]> wrote:
>
> Oh, alright then. Patch applied (#3494)
Thanks. One more patch for your consideration for something I needed
recently: getting absolute, canonical file paths. In principle this
can be implemented in pure Lua with the current lfs module, but
getting all the corner cases right (e.g. foo/bar/./../baz) is not so
easy. Perhaps having a convenience function for this is not such a bad
idea (and using proper system APIs will guarantee that the result is
correct).
There is no Unix counterpart in the patch, because I didn't know how
to implement it (with a call to realpath?) and I would have no way to
test it anyway.
Cheers,
Tomek
Index: lfs.c
===================================================================
--- lfs.c (revision 3491)
+++ lfs.c (working copy)
@@ -698,6 +698,10 @@
/* simply do nothing */
return 1;
}
+static int get_real_path (lua_State *L) {
+ /* to be implemented */
+ return 1;
+}
#else
static int link_info (lua_State *L) {
lua_pushboolean(L, 0);
@@ -729,6 +733,26 @@
lua_pushlstring(L, (const char *)buffer, (size_t)length);
return 1;
}
+static int get_real_path (lua_State *L) {
+ long length = 0;
+ TCHAR* buffer = NULL;
+ const char *lpszPath = luaL_checkstring (L, 1);
+ length = GetFullPathName(lpszPath, 0, NULL, NULL);
+ if (length == 0) {
+ lua_pushnil(L);
+ lua_pushfstring(L, "operating system error: %d", (int)GetLastError());
+ return 2;
+ }
+ buffer = (TCHAR *)xmalloc(length * sizeof(TCHAR));
+ length = GetFullPathName(lpszPath, length, buffer, NULL);
+ if (length == 0) {
+ lua_pushnil(L);
+ lua_pushfstring(L, "operating system error: %d", (int)GetLastError());
+ return 2;
+ }
+ lua_pushlstring(L, (const char *)buffer, (size_t)length);
+ return 1;
+}
#endif
@@ -800,6 +824,7 @@
{"symlinkattributes", link_info},
{"readlink", read_link},
{"shortname", get_short_name},
+ {"realpath", get_real_path},
{"setmode", lfs_f_setmode},
{"touch", file_utime},
{"unlock", file_unlock},
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