/* unix-lib.c - make the newlisp shared newlisp library

    Copyright (C) 2016 Lutz Mueller

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "newlisp.h"
#include "protos.h"

extern int bigEndian;
extern char preLoad[];
extern CELL * sysEvalString(char * str, SYMBOL * context, CELL * proc, int mode);
extern void setupAllSignals(void);
extern int evalSilent;
extern int opsys;
extern SYMBOL * mainArgsSymbol;
extern char linkOffset[];
extern FILE * IOchannel;
extern int newlispLibConsoleFlag;

int libInitialized = 0;

#ifdef MAC_OSX
#ifdef EMSCRIPTEN
#define LIBNAME "newlisp-js-lib.js"
#else
#define LIBNAME "newlisp.dylib"
#endif
#else
#define LIBNAME "newlisp.so"
#endif

void initializeMain(void)
{
#ifndef EMSCRIPTEN
char name[MAX_LINE];
char * initFile;
#endif

opsys += 64;

#ifdef SUPPORT_UTF8
opsys += 128;
#endif

#ifdef NEWLISP64
opsys += 256;
#endif

#ifdef FFI
opsys += 1024;
initFFI();
#endif

#ifdef EMSCRIPTEN
opsys += 2048;
#endif

bigEndian = (*((char *)&bigEndian) == 0);


initLocale();
initStacks();
initialize();
mainArgsSymbol->contents = (UINT)makeCell(CELL_EXPRESSION, (UINT)stuffString(LIBNAME));
/* setupAllSignals(); taken out for LIBRARY in 10.5.7 */
sysEvalString(preLoad, mainContext, nilCell, EVAL_STRING);


IOchannel = stdin;
#ifndef EMSCRIPTEN
initDefaultInAddr(); 

initFile = getenv("NEWLISPLIB_INIT");
if(initFile)
    {
    strncpy(name, initFile, MAX_LINE);
    name[MAX_LINE - 1] = 0;
    loadFile(name, 0, 0, mainContext);
    }
#endif

libInitialized = 1;
reset();
}

extern STREAM errorStream;
STREAM libStrStream = {NULL, NULL, 0, 0, 0};

/* ---- imported and called from a client using newlisp.so ---- */

char * newlispEvalStr(char * cmd)
{
if(!libInitialized) initializeMain();

if(setjmp(errorJump)) 
    {
    /* setupAllSignals(); taken out for LIBRARY in 10.5.7 */

    reset();
    initStacks();

    if(errorReg) 
        {
        executeSymbol(errorEvent, NULL, NULL);
        return(libStrStream.buffer);
        }
    else
        return(errorStream.buffer);
    }

openStrStream(&libStrStream, MAX_STRING, 1);
executeCommandLine(cmd, (UINT)&libStrStream, NULL);

if(evalSilent) evalSilent = 0;

return(libStrStream.buffer);
}

/* don't let stdout be included in return string */
int newlispLibConsole(int flag)
{
newlispLibConsoleFlag = flag;
return(flag);
}

#ifdef EMSCRIPTEN
/* for callbacks 'eval-string-js' is used see p_evalStringJS in newlisp.c */
#else
/* callbacks from newlisp library into caller 

currently only tested with newLISP as caller:

(import "newlisp.dylib" "newlispEvalStr")
(import "newlisp.dylib" "newlispCallback")
(define (callme p1 p2 p3) (println "p1 => " p1 " p2 => " p2 " p3 => " p3) "hello world")
(newlispCallback "callme" (callback 0 'callme) "cdecl")
(get-string (newlispEvalStr {(get-string (callme 123 456 789))})) ; for string return
;(get-string (newlispEvalStr {(callme 123 456 789)})) ; for number return

*/

long newlispCallback(char * funcName, long funcAddr, char * callType)
{
CELL * pCell;
SYMBOL * symbol;

if(!libInitialized) initializeMain();

if(callType != NULL && strcmp(callType, "stdcall") ==  0)
    pCell = getCell(CELL_IMPORT_DLL);
else
    pCell = getCell(CELL_IMPORT_CDECL);

symbol = translateCreateSymbol(funcName, pCell->type, currentContext, TRUE);

if(isProtected(symbol->flags))
    {
    errorProcExt2(ERR_SYMBOL_PROTECTED, stuffSymbol(symbol));
    return(-1);
    }

deleteList((CELL *)symbol->contents);
symbol->contents = (UINT)pCell;
pCell->contents = (UINT)funcAddr;

pCell->aux = (UINT)symbol->name;

return(funcAddr);
}
#endif
/* eof */