lua logic failing

[awsdert]

I can extract directories with the below code just fine but arguments like "src/libbasic/*.c" aren't resulting in anything (yes there are c files in that directory), any ideas?

local function _wildcard(arg)
	if type(arg) ~= "string" then return {} end
	print('# _wildcard("' .. arg .. '")')
	local pfx, sfx, c, sep, j
	local dir, sep, d = '.', '/', 0
	local list = {}
	local dirs = false
	for i = 1, #arg, 1 do
		c = arg:sub(i,i)
		if c == '*' then break end
		j = i
		if c == '/' or c == '\\' then
			sep = c
			d = i
		end
	end
	if not c then return list end
	if j then
		pfx = arg:sub(1,j)
		if d > 0 then dir = arg:sub(1,d-1) end
	end
	if not j then sfx = arg:sub(2) else sfx = arg:sub(j+2) end
	if sfx then
		c = sfx:sub(#sfx)
		if c == '/' or c == '\\' then
			dirs = true
			if #sfx > 1 then
				sfx = sfx:sub(1,#sfx-1)
			else
				sfx = nil
			end
		end
	end
	for name in lfs.dir(dir) do
		local path = dir .. sep .. name
		local mode = lfs.attributes(path,"mode")
		local same_mode = true
		if dirs == true then
			same_mode = (mode == "directory")
		else
			same_mode = (mode ~= "directory")
		end
		if name ~= '.' and name ~= '..' and same_mode then

			local same_pfx, same_sfx = true, true
			if not pfx then path = name
			else
				local seg = path:sub(1,j)
				same_pfx = (seg == pfx)
			end
			if sfx then
				local val = sfx
				local seg = path:sub(#path - #sfx)
				same_sfx = (seg == sfx)
			end
			if same_pfx == true and same_sfx == true then
				table.insert(list, path)
			end
		end
	end
	return list
end

[awsdert]

Never mind, finally spotted what I did wrong, I didn't realise I needed to minus 1 from the length of sfx, code now looks like this (I also noticed some left over code from experiments so fixed that too):

local function _wildcard(arg)
	if type(arg) ~= "string" then return {} end
	local pfx, sfx, c, sep, j
	local dir, sep, d = '.', '/', 0
	local list = {}
	local dirs = false
	for i = 1, #arg, 1 do
		c = arg:sub(i,i)
		if c == '*' then break end
		j = i
		if c == '/' or c == cfg.dir_sep then
			sep = c
			d = i
		end
	end
	if not c then return list end
	if j then
		pfx = (arg:sub(1,j) or '')
		sfx = (arg:sub(j+2) or '')
		if d > 0 then dir = arg:sub(1,d-1) end
	else
		pfx = ''
		sfx = (arg:sub(2) or '')
	end
	if sfx ~= '' then
		c = sfx:sub(#sfx)
		if c == '/' or c == cfg.dir_sep then
			dirs = true
			sfx = (sfx:sub(1,#sfx-1) or '')
		end
	end
	for name in lfs.dir(dir) do
		local path = dir .. sep .. name
		local mode = lfs.attributes(path,"mode")
		local same_pfx, same_sfx, same_mode
		same_mode = (dirs == (mode == "directory"))
		if name ~= '.' and name ~= '..' and same_mode == true then
			if pfx == '' then
				path = name
				same_pfx = true
			else
				local seg = (path:sub(1,#pfx) or '')
				same_pfx = (seg == pfx)
			end
			if sfx == '' then
				same_sfx = true
			else
				local seg = (path:sub(#path - (#sfx-1)) or '')
				same_sfx = (seg == sfx)
			end
			if same_pfx == true and same_sfx == true then
				table.insert(list, path)
			end
		end
	end
	return list
end