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lua_glue.c
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/**
* MojoSetup; a portable, flexible installation application.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
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#include "universal.h"
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#include "lua_glue.h"
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#include "platform.h"
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#include "fileio.h"
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
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#include "gui.h"
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#define MOJOSETUP_NAMESPACE "MojoSetup"
static lua_State *luaState = NULL;
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// Allocator interface for internal Lua use.
static void *MojoLua_alloc(void *ud, void *ptr, size_t osize, size_t nsize)
{
if (nsize == 0)
{
free(ptr);
return NULL;
} // if
return xrealloc(ptr, nsize);
} // MojoLua_alloc
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// Read data from a MojoInput when loading Lua code.
static const char *MojoLua_reader(lua_State *L, void *data, size_t *size)
{
MojoInput *in = (MojoInput *) data;
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char *retval = (char *) scratchbuf_128k;
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int64 br = in->read(in, scratchbuf_128k, sizeof (scratchbuf_128k));
if (br <= 0) // eof or error? (lua doesn't care which?!)
{
br = 0;
retval = NULL;
} // if
*size = (size_t) br;
return retval;
} // MojoLua_reader
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// Sets t[sym]=f, where t is on the top of the Lua stack.
// !!! FIXME: why is this a different naming convention?
static inline void set_cfunc(lua_State *L, lua_CFunction f, const char *sym)
{
lua_pushcfunction(L, f);
lua_setfield(L, -2, sym);
} // set_cfunc
// Sets t[sym]=f, where t is on the top of the Lua stack.
// !!! FIXME: why is this a different naming convention?
static inline void set_cptr(lua_State *L, void *ptr, const char *sym)
{
lua_pushlightuserdata(L, ptr);
lua_setfield(L, -2, sym);
} // set_cfunc
// Sets t[sym]=f, where t is on the top of the Lua stack.
// !!! FIXME: why is this a different naming convention?
static inline void set_string(lua_State *L, const char *str, const char *sym)
{
if (str == NULL)
lua_pushnil(L);
else
lua_pushstring(L, str);
lua_setfield(L, -2, sym);
} // set_string
// Sets t[sym]=f, where t is on the top of the Lua stack.
// !!! FIXME: why is this a different naming convention?
static inline void set_number(lua_State *L, lua_Number x, const char *sym)
{
lua_pushnumber(L, x);
lua_setfield(L, -2, sym);
} // set_string
// !!! FIXME: why is this a different naming convention?
static inline void set_string_array(lua_State *L, int argc, const char **argv,
const char *sym)
{
int i;
lua_newtable(L);
for (i = 0; i < argc; i++)
{
lua_pushinteger(L, i+1); // lua is option base 1!
lua_pushstring(L, argv[i]);
lua_settable(L, -3);
} // for
lua_setfield(L, -2, sym);
} // set_string_array
void MojoLua_setString(const char *str, const char *sym)
{
lua_getglobal(luaState, MOJOSETUP_NAMESPACE);
set_string(luaState, str, sym);
lua_pop(luaState, 1);
} // MojoLua_setString
void MojoLua_setStringArray(int argc, const char **argv, const char *sym)
{
lua_getglobal(luaState, MOJOSETUP_NAMESPACE);
set_string_array(luaState, argc, argv, sym);
lua_pop(luaState, 1);
} // MojoLua_setStringArray
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static inline int retvalString(lua_State *L, const char *str)
{
if (str != NULL)
lua_pushstring(L, str);
else
lua_pushnil(L);
return 1;
} // retvalString
static inline int retvalBoolean(lua_State *L, boolean b)
{
lua_pushboolean(L, b);
return 1;
} // retvalBoolean
static inline int retvalNumber(lua_State *L, lua_Number n)
{
lua_pushnumber(L, n);
return 1;
} // retvalNumber
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static inline int retvalLightUserData(lua_State *L, void *data)
{
if (data != NULL)
lua_pushlightuserdata(L, data);
else
lua_pushnil(L);
return 1;
} // retvalLightUserData
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static inline int snprintfcat(char **ptr, size_t *len, const char *fmt, ...)
{
int bw = 0;
va_list ap;
va_start(ap, fmt);
bw = vsnprintf(*ptr, *len, fmt, ap);
va_end(ap);
*ptr += bw;
*len -= bw;
return bw;
} // snprintfcat
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static int luahook_stackwalk(lua_State *L)
{
const char *errstr = lua_tostring(L, 1);
lua_Debug ldbg;
int i = 0;
if (errstr != NULL)
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logDebug("%s\n", errstr);
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logDebug("Lua stack backtrace:");
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// start at 1 to skip this function.
for (i = 1; lua_getstack(L, i, &ldbg); i++)
{
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char *ptr = (char *) scratchbuf_128k;
size_t len = sizeof (scratchbuf_128k);
int bw = snprintfcat(&ptr, &len, "#%d", i-1);
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const int maxspacing = 4;
int spacing = maxspacing - bw;
while (spacing-- > 0)
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snprintfcat(&ptr, &len, " ");
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if (!lua_getinfo(L, "nSl", &ldbg))
{
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snprintfcat(&ptr, &len, "???\n");
logDebug((const char *) scratchbuf_128k);
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continue;
} // if
if (ldbg.namewhat[0])
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snprintfcat(&ptr, &len, "%s ", ldbg.namewhat);
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if ((ldbg.name) && (ldbg.name[0]))
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snprintfcat(&ptr, &len, "function %s ()", ldbg.name);
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else
{
if (strcmp(ldbg.what, "main") == 0)
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snprintfcat(&ptr, &len, "mainline of chunk");
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else if (strcmp(ldbg.what, "tail") == 0)
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snprintfcat(&ptr, &len, "tail call");
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else
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snprintfcat(&ptr, &len, "unidentifiable function");
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} // if
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logDebug((const char *) scratchbuf_128k);
ptr = (char *) scratchbuf_128k;
len = sizeof (scratchbuf_128k);
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for (spacing = 0; spacing < maxspacing; spacing++)
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snprintfcat(&ptr, &len, " ");
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if (strcmp(ldbg.what, "C") == 0)
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snprintfcat(&ptr, &len, "in native code");
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else if (strcmp(ldbg.what, "tail") == 0)
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snprintfcat(&ptr, &len, "in Lua code");
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else if ( (strcmp(ldbg.source, "=?") == 0) && (ldbg.currentline == 0) )
snprintfcat(&ptr, &len, "in Lua code (debug info stripped)");
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else
{
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snprintfcat(&ptr, &len, "in Lua code at %s", ldbg.short_src);
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if (ldbg.currentline != -1)
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snprintfcat(&ptr, &len, ":%d", ldbg.currentline);
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} // else
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logDebug((const char *) scratchbuf_128k);
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} // for
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return retvalString(L, errstr ? errstr : "");
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} // luahook_stackwalk
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// This just lets you punch in one-liners and Lua will run them as individual
// chunks, but you can completely access all Lua state, including calling C
// functions and altering tables. At this time, it's more of a "console"
// than a debugger. You can do "p MojoLua_debugger()" from gdb to launch this
// from a breakpoint in native code, or call MojoSetup.debugger() to launch
// it from Lua code (with stacktrace intact, too: type 'bt' to see it).
static int luahook_debugger(lua_State *L)
{
#if DISABLE_LUA_PARSER
logError("Lua debugger is disabled in this build (no parser).");
#else
int origtop;
lua_pushcfunction(luaState, luahook_stackwalk);
origtop = lua_gettop(L);
printf("Quick and dirty Lua debugger. Type 'exit' to quit.\n");
while (true)
{
char *buf = (char *) scratchbuf_128k;
int len = 0;
printf("> ");
fflush(stdout);
if (fgets(buf, sizeof (scratchbuf_128k), stdin) == NULL)
{
printf("\n\n fgets() on stdin failed: ");
break;
} // if
len = (int) (strlen(buf) - 1);
while ( (len >= 0) && ((buf[len] == '\n') || (buf[len] == '\r')) )
buf[len--] = '\0';
if (strcmp(buf, "q") == 0)
break;
else if (strcmp(buf, "exit") == 0)
break;
else if (strcmp(buf, "bt") == 0)
strcpy(buf, "MojoSetup.stackwalk()");
if ( (luaL_loadstring(L, buf) != 0) ||
(lua_pcall(luaState, 0, LUA_MULTRET, -2) != 0) )
{
printf("%s\n", lua_tostring(L, -1));
lua_pop(L, 1);
} // if
else
{
printf("Returned %d values.\n", lua_gettop(L) - origtop);
while (lua_gettop(L) != origtop)
{
// !!! FIXME: dump details of values to stdout here.
lua_pop(L, 1);
} // while
printf("\n");
} // else
} // while
lua_pop(L, 1);
printf("exiting debugger...\n");
#endif
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return 0;
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} // luahook_debugger
void MojoLua_debugger(void)
{
luahook_debugger(luaState);
} // MojoLua_debugger
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boolean MojoLua_callProcedure(const char *funcname)
{
boolean called = false;
lua_State *L = luaState;
int popcount = 0;
if (L != NULL)
{
lua_getglobal(L, MOJOSETUP_NAMESPACE); popcount++;
if (lua_istable(L, -1)) // namespace is sane?
{
lua_getfield(L, -1, funcname); popcount++;
if (lua_isfunction(L, -1))
{
lua_call(L, 0, 0);
called = true;
} // if
} // if
lua_pop(L, popcount);
} // if
return called;
} // MojoLua_callProcedure
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boolean MojoLua_runFile(const char *name)
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{
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MojoArchive *ar = GBaseArchive; // in case we want to generalize later.
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const MojoArchiveEntry *entinfo;
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boolean retval = false;
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char clua[128]; // compiled filename.
char ulua[128]; // uncompiled filename.
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int rc = 0;
MojoInput *io = NULL;
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if (snprintf(clua, sizeof(clua), "scripts/%s.luac", name) >= sizeof (clua))
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return false;
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if (snprintf(ulua, sizeof(ulua), "scripts/%s.lua", name) >= sizeof (ulua))
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return false;
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if (ar->enumerate(ar))
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{
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while ((io == NULL) && ((entinfo = ar->enumNext(ar)) != NULL))
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{
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boolean match = false;
if (entinfo->type != MOJOARCHIVE_ENTRY_FILE)
continue;
match = (strcmp(entinfo->filename, clua) == 0);
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#if !DISABLE_LUA_PARSER
if (!match)
match = (strcmp(entinfo->filename, ulua) == 0);
#endif
if (match)
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io = ar->openCurrentEntry(ar);
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} // while
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} // if
if (io != NULL)
{
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char *realfname = (char *) xmalloc(strlen(entinfo->filename) + 2);
sprintf(realfname, "@%s", entinfo->filename);
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lua_pushcfunction(luaState, luahook_stackwalk);
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rc = lua_load(luaState, MojoLua_reader, io, realfname);
free(realfname);
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io->close(io);
if (rc != 0)
lua_error(luaState);
else
{
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// Call new chunk on top of the stack (lua_pcall will pop it off).
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if (lua_pcall(luaState, 0, 0, -2) != 0) // retvals are dumped.
lua_error(luaState); // error on stack has debug info.
else
retval = true; // if this didn't panic, we succeeded.
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} // if
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lua_pop(luaState, 1); // dump stackwalker.
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} // if
return retval;
} // MojoLua_runFile
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void MojoLua_collectGarbage(void)
{
lua_State *L = luaState;
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uint32 ticks = 0;
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int pre = 0;
int post = 0;
pre = (lua_gc(L, LUA_GCCOUNT, 0) * 1024) + lua_gc(L, LUA_GCCOUNTB, 0);
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logDebug("Collecting garbage (currently using %d bytes).", pre);
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ticks = MojoPlatform_ticks();
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lua_gc (L, LUA_GCCOLLECT, 0);
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profile("Garbage collection", ticks);
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post = (lua_gc(L, LUA_GCCOUNT, 0) * 1024) + lua_gc(L, LUA_GCCOUNTB, 0);
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logDebug("Now using %d bytes (%d bytes savings).\n", post, pre - post);
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} // MojoLua_collectGarbage
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// You can trigger the garbage collector with more control in the standard
// Lua runtime, but this notes profiling and statistics via logDebug().
static int luahook_collectgarbage(lua_State *L)
{
MojoLua_collectGarbage();
return 0;
} // luahook_collectgarbage
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// Since localization is kept in Lua tables, I stuck this in the Lua glue.
const char *translate(const char *str)
{
const char *retval = str;
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if (luaState != NULL) // No translations before Lua is initialized.
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{
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if (lua_checkstack(luaState, 3))
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{
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int popcount = 0;
lua_getglobal(luaState, MOJOSETUP_NAMESPACE); popcount++;
if (lua_istable(luaState, -1)) // namespace is sane?
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{
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lua_getfield(luaState, -1, "translations"); popcount++;
if (lua_istable(luaState, -1)) // translation table is sane?
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{
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const char *tr = NULL;
lua_getfield(luaState, -1, str); popcount++;
tr = lua_tostring(luaState, -1);
if (tr != NULL) // translated for this locale?
{
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char *dst = (char *) scratchbuf_128k;
xstrncpy(dst, tr, sizeof(scratchbuf_128k));
retval = dst;
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} // if
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} // if
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} // if
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lua_pop(luaState, popcount); // remove our stack salsa.
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} // if
} // if
return retval;
} // translate
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// Use this instead of Lua's error() function if you don't have a
// programatic error, so you don't get stack callback stuff:
// MojoSetup.fatal("You need the base game to install this expansion pack.")
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// This will also handle cleanup of half-written installations.
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// Doesn't actually return.
static int luahook_fatal(lua_State *L)
{
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const char *errstr = lua_tostring(L, 1);
if (errstr == NULL)
errstr = _("Unknown error");
return fatal(errstr); // doesn't actually return.
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} // luahook_fatal
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// Lua interface to MojoLua_runFile(). This is needed instead of Lua's
// require(), since it can access scripts inside an archive.
static int luahook_runfile(lua_State *L)
{
const char *fname = luaL_checkstring(L, 1);
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return retvalBoolean(L, MojoLua_runFile(fname));
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} // luahook_runfile
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// Lua interface to translate().
static int luahook_translate(lua_State *L)
{
const char *str = luaL_checkstring(L, 1);
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return retvalString(L, translate(str));
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} // luahook_translate
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static int luahook_ticks(lua_State *L)
{
lua_pushnumber(L, MojoPlatform_ticks());
return 1;
} // luahook_ticks
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static int luahook_msgbox(lua_State *L)
{
if (GGui != NULL)
{
const char *title = luaL_checkstring(L, 1);
const char *text = luaL_checkstring(L, 2);
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GGui->msgbox(title, text);
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} // if
return 0;
} // luahook_msgbox
static int luahook_promptyn(lua_State *L)
{
boolean rc = false;
if (GGui != NULL)
{
const char *title = luaL_checkstring(L, 1);
const char *text = luaL_checkstring(L, 2);
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rc = GGui->promptyn(title, text);
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} // if
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return retvalBoolean(L, rc);
} // luahook_promptyn
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static int luahook_promptynan(lua_State *L)
{
MojoGuiYNAN rc = MOJOGUI_NO;
if (GGui != NULL)
{
const char *title = luaL_checkstring(L, 1);
const char *text = luaL_checkstring(L, 2);
rc = GGui->promptynan(title, text);
} // if
// Never localize these strings!
switch (rc)
{
case MOJOGUI_YES: return retvalString(L, "yes");
case MOJOGUI_NO: return retvalString(L, "no");
case MOJOGUI_ALWAYS: return retvalString(L, "always");
case MOJOGUI_NEVER: return retvalString(L, "never");
} // switch
assert(false && "BUG: unhandled case in switch statement");
return 0; // shouldn't hit this.
} // luahook_promptynan
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static int luahook_logwarning(lua_State *L)
{
logWarning(luaL_checkstring(L, 1));
return 0;
} // luahook_logwarning
static int luahook_logerror(lua_State *L)
{
logError(luaL_checkstring(L, 1));
return 0;
} // luahook_logerror
static int luahook_loginfo(lua_State *L)
{
logInfo(luaL_checkstring(L, 1));
return 0;
} // luahook_loginfo
static int luahook_logdebug(lua_State *L)
{
logDebug(luaL_checkstring(L, 1));
return 0;
} // luahook_logdebug
static int luahook_cmdline(lua_State *L)
{
const char *arg = luaL_checkstring(L, 1);
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return retvalBoolean(L, cmdline(arg));
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} // luahook_cmdline
static int luahook_cmdlinestr(lua_State *L)
{
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const int argc = lua_gettop(L);
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const char *arg = luaL_checkstring(L, 1);
const char *envr = (argc < 2) ? NULL : lua_tostring(L, 2);
const char *deflt = (argc < 3) ? NULL : lua_tostring(L, 3);
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return retvalString(L, cmdlinestr(arg, envr, deflt));
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} // luahook_cmdlinestr
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static int luahook_truncatenum(lua_State *L)
{
const lua_Number dbl = lua_tonumber(L, 1);
return retvalNumber(L, (lua_Number) ((int64) dbl));
} // luahook_truncatenum
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static int luahook_wildcardmatch(lua_State *L)
{
const char *str = luaL_checkstring(L, 1);
const char *pattern = luaL_checkstring(L, 2);
return retvalBoolean(L, wildcardMatch(str, pattern));
} // luahook_wildcardmatch
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static int luahook_findmedia(lua_State *L)
{
// Let user specify overrides of directories to act as drives.
// This is good if for some reason MojoSetup can't find them, or they
// want to pretend a copy on the filesystem is really a CD, etc.
// Put your anti-piracy crap in your OWN program. :)
//
// You can specify with command lines or environment variables, command
// lines taking precedence:
// MOJOSETUP_MEDIA0=/my/patch ./installer --media1=/over/there
//
// --media and MOJOSETUP_MEDIA are checked first, then --media0 and
// MOJOSETUP_MEDIA0, etc until you find the media or run out of
// overrides.
//
// After the overrides, we ask the platform layer to find the media.
const char *unique = luaL_checkstring(L, 1);
const char *override = cmdlinestr("media", "MOJOSETUP_MEDIA", NULL);
char *physical = NULL;
char cmdbuf[64];
char envrbuf[64];
int i = 0;
do
{
if ( (override) && (MojoPlatform_exists(override, unique)) )
return retvalString(L, override);
snprintf(cmdbuf, sizeof (cmdbuf), "media%d", i);
snprintf(envrbuf, sizeof (envrbuf), "MOJOSETUP_MEDIA%d", i);
} while ((override = cmdlinestr(cmdbuf, envrbuf, NULL)) != NULL);
// No override. Try platform layer for real media...
physical = MojoPlatform_findMedia(unique);
retvalString(L, physical); // may push nil.
free(physical);
return 1;
} // luahook_findmedia
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static boolean writeCallback(uint32 ticks, int64 justwrote, int64 bw,
int64 total, void *data)
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{
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boolean retval = false;
lua_State *L = (lua_State *) data;
// Lua callback is on top of stack...
if (lua_isnil(L, -1))
retval = true;
else
{
lua_pushvalue(L, -1);
lua_pushnumber(L, (lua_Number) ticks);
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lua_pushnumber(L, (lua_Number) justwrote);
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lua_pushnumber(L, (lua_Number) bw);
lua_pushnumber(L, (lua_Number) total);
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lua_call(L, 4, 1);
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retval = lua_toboolean(L, -1);
lua_pop(L, 1);
} // if
return retval;
} // writeCallback
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// !!! FIXME: push this into Lua, make things fatal.
static int luahook_writefile(lua_State *L)
{
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MojoArchive *archive = (MojoArchive *) lua_touserdata(L, 1);
const char *path = luaL_checkstring(L, 2);
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boolean retval = false;
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MojoInput *in = archive->openCurrentEntry(archive);
if (in != NULL)
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{
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retval = MojoInput_toPhysicalFile(in, path, archive->prevEnum.perms,
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writeCallback, L);
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} // if
return retvalBoolean(L, retval);
} // luahook_writefile
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static int luahook_download(lua_State *L)
{
boolean retval = false;
const char *url = luaL_checkstring(L, 1);
const char *dst = luaL_checkstring(L, 2);
MojoInput *in = MojoInput_fromURL(url);
// !!! FIXME: Unix-specific permissions thing here.
if (in != NULL)
retval = MojoInput_toPhysicalFile(in, dst, 0644, writeCallback, L);
return retvalBoolean(L, retval);
} // luahook_download
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static int luahook_archive_fromdir(lua_State *L)
{
const char *path = luaL_checkstring(L, 1);
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return retvalLightUserData(L, MojoArchive_newFromDirectory(path));
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} // luahook_archive_fromdir
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static int luahook_archive_fromfile(lua_State *L)
{
const char *path = luaL_checkstring(L, 1);
MojoInput *io = MojoInput_newFromFile(path);
MojoArchive *archive = NULL;
if (io != NULL)
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archive = MojoArchive_newFromInput(io, path);
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return retvalLightUserData(L, archive);
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} // luahook_archive_fromfile
static int luahook_archive_fromentry(lua_State *L)
{
MojoArchive *ar = (MojoArchive *) lua_touserdata(L, 1);
MojoInput *io = ar->openCurrentEntry(ar);
MojoArchive *archive = NULL;
if (io != NULL)
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archive = MojoArchive_newFromInput(io, ar->prevEnum.filename);
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return retvalLightUserData(L, archive);
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} // luahook_archive_fromentry
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static int luahook_archive_enumerate(lua_State *L)
{
MojoArchive *archive = (MojoArchive *) lua_touserdata(L, 1);
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return retvalBoolean(L, archive->enumerate(archive));
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} // luahook_archive_enumerate
static int luahook_archive_enumnext(lua_State *L)
{
MojoArchive *archive = (MojoArchive *) lua_touserdata(L, 1);
const MojoArchiveEntry *entinfo = archive->enumNext(archive);
if (entinfo == NULL)
lua_pushnil(L);
else
{
const char *typestr = NULL;
if (entinfo->type == MOJOARCHIVE_ENTRY_FILE)
typestr = "file";
else if (entinfo->type == MOJOARCHIVE_ENTRY_DIR)
typestr = "dir";
else if (entinfo->type == MOJOARCHIVE_ENTRY_SYMLINK)
typestr = "symlink";
else
typestr = "unknown";
lua_newtable(L);
set_string(L, entinfo->filename, "filename");
set_string(L, entinfo->linkdest, "linkdest");
set_number(L, entinfo->filesize, "filesize");
set_string(L, typestr, "type");
} // else
return 1;
} // luahook_archive_enumnext
static int luahook_archive_close(lua_State *L)
{
MojoArchive *archive = (MojoArchive *) lua_touserdata(L, 1);
archive->close(archive);
return 0;
} // luahook_archive_close
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static int luahook_platform_unlink(lua_State *L)
{
const char *path = luaL_checkstring(L, 1);
return retvalBoolean(L, MojoPlatform_unlink(path));
} // luahook_platform_unlink
static int luahook_platform_exists(lua_State *L)
{
const char *dir = luaL_checkstring(L, 1);
const char *fname = lua_tostring(L, 2); // can be nil.
return retvalBoolean(L, MojoPlatform_exists(dir, fname));
} // luahook_platform_exists
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static int luahook_platform_writable(lua_State *L)
{
const char *fname = luaL_checkstring(L, 1);
return retvalBoolean(L, MojoPlatform_writable(fname));
} // luahook_platform_writable
static int luahook_platform_isdir(lua_State *L)
{
const char *dir = luaL_checkstring(L, 1);
return retvalBoolean(L, MojoPlatform_isdir(dir));
} // luahook_platform_writable
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static int luahook_platform_symlink(lua_State *L)
{
const char *src = luaL_checkstring(L, 1);
const char *dst = luaL_checkstring(L, 2);
return retvalBoolean(L, MojoPlatform_symlink(src, dst));
} // luahook_platform_symlink
static int luahook_platform_mkdir(lua_State *L)
{
const char *dir = luaL_checkstring(L, 1);
return retvalBoolean(L, MojoPlatform_mkdir(dir));
} // luahook_platform_mkdir
static int luahook_movefile(lua_State *L)
{
boolean retval = false;
const char *src = luaL_checkstring(L, 1);
const char *dst = luaL_checkstring(L, 2);
retval = MojoPlatform_rename(src, dst);
if (!retval)
{
MojoInput *in = MojoInput_newFromFile(src);
if (in != NULL)
{
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uint16 perms = 0;
MojoPlatform_perms(src, &perms);
retval = MojoInput_toPhysicalFile(in, dst, perms, NULL, NULL);
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if (retval)
{
retval = MojoPlatform_unlink(src);
if (!retval)
MojoPlatform_unlink(dst); // oh well.
} // if
} // if
} // if
return retvalBoolean(L, retval);
} // luahook_movefile
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static int luahook_gui_start(lua_State *L)
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{
const char *title = luaL_checkstring(L, 1);
const char *splash = lua_tostring(L, 2);
849
return retvalBoolean(L, GGui->start(title, splash));
850
} // luahook_gui_start
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static const uint8 *loadFile(const char *fname, size_t *len)
854
{
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uint8 *retval = NULL;
MojoInput *io = MojoInput_newFromArchivePath(GBaseArchive, fname);
if (io != NULL)
{
int64 len64 = io->length(io);
*len = (size_t) len64;
if (*len == len64)
{
retval = (uint8 *) xmalloc(*len + 1);
if (io->read(io, retval, *len) == *len)
retval[*len] = '\0';
else
{
free(retval);
retval = NULL;
} // else
} // if
io->close(io);
} // if
return retval;
} // loadFile
static inline boolean canGoBack(int thisstage)
{
return (thisstage > 1);
} // canGoBack
static inline boolean canGoForward(int thisstage, int maxstage)
{
return (thisstage < maxstage);
} // canGoForward
static int luahook_gui_readme(lua_State *L)
{
size_t len = 0;
const char *name = luaL_checkstring(L, 1);
const char *fname = luaL_checkstring(L, 2);
const int thisstage = luaL_checkinteger(L, 3);
const int maxstage = luaL_checkinteger(L, 4);
const uint8 *data = loadFile(fname, &len);
const boolean can_go_back = canGoBack(thisstage);
const boolean can_go_fwd = canGoForward(thisstage, maxstage);
if (data == NULL)
fatal(_("failed to load file '%s'"), fname);
903
lua_pushnumber(L, GGui->readme(name, data, len, can_go_back, can_go_fwd));
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911
free((void *) data);
return 1;
} // luahook_gui_readme
static int luahook_gui_stop(lua_State *L)
{
GGui->stop();
912
return 0;
913
} // luahook_gui_stop
914
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916
917
// !!! FIXME: would like to push all this tree walking into Lua, and just
// !!! FIXME: build the final C tree without any validating here.
918
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920
typedef MojoGuiSetupOptions GuiOptions; // a little less chatty.
// forward declare this for recursive magic...
921
static GuiOptions *build_gui_options(lua_State *L, GuiOptions *parent);
922
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926
927
// An option table (from Setup.Option{} or Setup.OptionGroup{}) must be at
// the top of the Lua stack.
static GuiOptions *build_one_gui_option(lua_State *L, GuiOptions *opts,
boolean is_option_group)
{
928
GuiOptions *newopt = NULL;
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boolean required = false;
boolean skipopt = false;
lua_getfield(L, -1, "required");
if (lua_toboolean(L, -1))
{
lua_pushboolean(L, true);
lua_setfield(L, -3, "value");
required = skipopt = true; // don't pass to GUI.
} // if
lua_pop(L, 1); // remove "required" from stack.
// "disabled=true" trumps "required=true"
lua_getfield(L, -1, "disabled");
if (lua_toboolean(L, -1))
{
if (required)
{
lua_getfield(L, -2, "description");
logWarning("Option '%s' is both required and disabled!",
lua_tostring(L, -1));
lua_pop(L, 1);
} // if
lua_pushboolean(L, false);
lua_setfield(L, -3, "value");
skipopt = true; // don't pass to GUI.
} // if
lua_pop(L, 1); // remove "disabled" from stack.
958
if (skipopt) // Skip this option, but look for children in required opts.
959
{
960
961
if (required)
newopt = build_gui_options(L, opts);
962
963
} // if
964
else // add this option.
965
{
966
newopt = (GuiOptions *) xmalloc(sizeof (GuiOptions));
967
newopt->is_group_parent = is_option_group;
968
newopt->value = true;
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978
lua_getfield(L, -1, "description");
newopt->description = xstrdup(lua_tostring(L, -1));
lua_pop(L, 1);
if (!is_option_group)
{
lua_getfield(L, -1, "value");
newopt->value = (lua_toboolean(L, -1) ? true : false);
lua_pop(L, 1);
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980
lua_getfield(L, -1, "bytes");
newopt->size = (int64) lua_tonumber(L, -1);
981
lua_pop(L, 1);
982
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985
986
987
988
989
990
991
992
993
newopt->opaque = ((int) lua_objlen(L, 4)) + 1;
lua_pushinteger(L, newopt->opaque);
lua_pushvalue(L, -2);
lua_settable(L, 4); // position #4 is our local lookup table.
} // if
newopt->child = build_gui_options(L, newopt); // look for children...
if ((is_option_group) && (!newopt->child)) // skip empty groups.
{
free((void *) newopt->description);
free(newopt);
newopt = NULL;
994
} // if
995
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999
1000
} // else
if (newopt != NULL)
{
newopt->next_sibling = opts;
opts = newopt; // prepend to list (we'll reverse it later...)