moo/stix/mod/stdio.c

/*
 * $Id$
 *
    Copyright (c) 2014-2016 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include <stix.h>
#include <stix-utl.h>

#include <stdio.h>
#include <limits.h>

static int prim_open (stix_t* stix, stix_ooi_t nargs)
{
	stix_oop_word_t rcv;
	stix_oop_char_t name;
	stix_oop_char_t mode;
	FILE* fp;

#if defined(STIX_OOCH_IS_UCH)
	stix_oow_t ucslen, bcslen;
	stix_bch_t namebuf[PATH_MAX];
	stix_bch_t modebuf[32]; /* TODO: dynamic-sized conversion?? */
#endif

	rcv = (stix_oop_word_t)STIX_STACK_GETRCV(stix, nargs);
	name = (stix_oop_char_t)STIX_STACK_GETARG(stix, nargs, 0);
	mode = (stix_oop_char_t)STIX_STACK_GETARG(stix, nargs, 1);

#if defined(STIX_OOCH_IS_UCH)
/* TODO: error check on string conversion */
	ucslen = STIX_OBJ_GET_SIZE(name);
	bcslen = STIX_COUNTOF(namebuf) - 1;
	stix_ucstoutf8 (name->slot, &ucslen, namebuf, &bcslen);
	namebuf[bcslen] = '\0';

	ucslen = STIX_OBJ_GET_SIZE(mode);
	bcslen = STIX_COUNTOF(modebuf) - 1;
	stix_ucstoutf8 (mode->slot, &ucslen, modebuf, &bcslen);
	modebuf[bcslen] = '\0';

STIX_DEBUG2 (stix, "opening %s for %s\n", namebuf, modebuf);
	fp = fopen (namebuf, modebuf);
#else
	fp = fopen (name->slot, mode->slot);
#endif
	if (!fp) 
	{
		return -1;  /* TODO: return success with an object instead... */
	}

	rcv->slot[0] = (stix_oow_t)fp;
	STIX_STACK_SETRETTORCV (stix, nargs);
	return 1;
}

static int prim_close (stix_t* stix, stix_ooi_t nargs)
{
	stix_oop_word_t rcv;

	rcv = (stix_oop_word_t)STIX_STACK_GETRCV(stix, nargs);
	if (rcv->slot[0])
	{
		fclose ((FILE*)rcv->slot[0]);
		rcv->slot[0] = 0;
	}

	STIX_STACK_SETRETTORCV (stix, nargs);
	return 1;
}

static int prim_write (stix_t* stix, stix_ooi_t nargs)
{
	/* return how many bytes have been written.. */

	STIX_STACK_SETRETTORCV (stix, nargs);
	return 1;
}

/* ------------------------------------------------------------------------ */

typedef struct fnctab_t fnctab_t;
struct fnctab_t
{
	const stix_bch_t* name;
	stix_prim_impl_t handler;
};

static fnctab_t fnctab[] =
{
	{ "close",      prim_close     },
	{ "open",       prim_open      },
	{ "write",      prim_write     }
};

/* ------------------------------------------------------------------------ */

static stix_prim_impl_t query (stix_t* stix, stix_prim_mod_t* mod, const stix_ooch_t* name)
{
	int left, right, mid, n;

	left = 0; right = STIX_COUNTOF(fnctab) - 1;

	while (left <= right)
	{
		mid = (left + right) / 2;

		n = stix_compoocbcstr (name, fnctab[mid].name);
		if (n < 0) right = mid - 1; 
		else if (n > 0) left = mid + 1;
		else
		{
			return fnctab[mid].handler;
		}
	}

	stix->errnum = STIX_ENOENT;
	return STIX_NULL;
}

#if 0
/* TOOD: concept of a argument_check fucntion?
 * check if receiver is a certain object?
 * check if receiver is at a certain size?
 * etc...
 */
static int sanity_check (stix_t* stix)
{
}
#endif

static void unload (stix_t* stix, stix_prim_mod_t* mod)
{
	/* TODO: close all open handle?? */
}


int stix_prim_mod_stdio (stix_t* stix, stix_prim_mod_t* mod)
{
	mod->query = query;
	mod->unload = unload; 
	mod->ctx = STIX_NULL;

#if 0

#include 'Stix.st'.
#import 'Console'.

	c = stix_findclass (stix, "Console");
	if (!c) c = stix_makeclass (stix, "Console", "x y"); <- provides an API to create a simple class

	stix_addmethod (stix, c, "open",         prim_open);
	stix_addmethod (stix, c, "close:",       prim_close);
	stix_addmethod (stix, c, "setCursorTo:", prim_setcursor);
	stix_addmethod (stix, c, "clear", prim_clear );
	stix_addmethod (stix, c, "write", prim_write );




/* GRAMMER ENHANCEMENT */
fun abc (a, b, c) <----- this style, register C style method
{
}

fun abc: a with: b c: c <----- smalltalk style 
{
}

abc->def (a, b, c)   <-------    use ->  as an c style method indicator
abc abc: a with: b c: c

#endif

	return 0;
}