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sdl2_frt/premake/util/sdl_depends.lua
Philipp Wiesemann 0e45984fa0 Fixed crash if initialization of EGL failed but was tried again later.
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().
2015-06-21 17:33:46 +02:00

75 lines
2.9 KiB
Lua
Executable File

-- Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
--
-- This software is provided 'as-is', without any express or implied
-- warranty. In no event will the authors be held liable for any damages
-- arising from the use of this software.
--
-- Permission is granted to anyone to use this software for any purpose,
-- including commercial applications, and to alter it and redistribute it
-- freely.
--
-- Meta-build system using premake created and maintained by
-- Benjamin Henning <b.henning@digipen.edu>
-- This is kept just for windows because the other platforms use different means
-- for determining dependence or compatibility.
--[[
sdl_depends.lua
This file simply contains a function for determining whether a dependency
exists on the Windows platform, given a possible environmental variable,
delimited search paths, and a main and/or sub-directory paths for more
elaborate pattern matching.
]]
-- find_dependency_dir_windows(env, main_search_path, main_dir_path)
-- Attempt to resolve a dependency (true or false) folder based on either an
-- environmental variable, start search path, or both. If both are present,
-- the environmental variable will be preferred. If neither are present, this
-- function returns false.
--
-- Arguments:
-- env The name of the environmental variable to treat as a path
-- main_search_paths Paths to look for the main directory in
-- main_dir_path The a path that must be contained between main_search_path and sub_dir_path
-- sub_dir_path The path of the directories that should exist at the searched path
function find_dependency_dir_windows(env, main_search_paths, main_dir_path, sub_dir_path)
if not os.is("windows") then -- if not windows, then fail
return false
end
if env == nil and (main_search_paths == nil or #main_search_paths == 0) then
return false
end
local env_path = nil
local main_path = nil
if env ~= nil then env_path = os.getenv(env) end
local search_table = { n = 0 }
if main_search_paths ~= nil then
for k,main_search_path in ipairs(explode(main_search_paths, ";")) do
local directories = os.matchdirs(main_search_path .. "/**" .. main_dir_path .. "*")
for k,v in pairs(directories) do
table.insert(search_table, v)
end
end
end
if env_path ~= nil then table.insert(search_table, env_path) end
local search_path = table.concat(search_table, ";")
local result_path = os.dirpathsearch(sub_dir_path, search_path, ";")
if result_path == nil then
return false
end
local found_dir = os.isdir(result_path)
local abs_path = path.getabsolute(result_path)
if found_dir and env_path ~= nil then
abs_path = abs_path:gsub("\\", "/")
env_path = env_path:gsub("\\", "/")
local pos = abs_path:indexOf(env_path)
if pos ~= nil then
abs_path = abs_path:sub(1, pos - 1) .. "$(" .. env .. ")/" .. abs_path:sub(pos + #env_path)
end
end
-- we want the path in terms of '/'
return found_dir, abs_path
end