1/*-
2 * Copyright (c) 2014 Pedro Souza <pedrosouza@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32
33#include "lua.h"
34#include "lauxlib.h"
35#include "lstd.h"
36#include "lutils.h"
37#include "bootstrap.h"
38#include <gfx_fb.h>
39#include <pnglite.h>
40
41/*
42 * Like loader.perform, except args are passed already parsed
43 * on the stack.
44 */
45static int
46lua_command(lua_State *L)
47{
48	int	i;
49	int	res = 1;
50	int 	argc = lua_gettop(L);
51	char	**argv;
52
53	argv = malloc(sizeof(char *) * (argc + 1));
54	if (argv == NULL)
55		return 0;
56	for (i = 0; i < argc; i++)
57		argv[i] = (char *)(intptr_t)luaL_checkstring(L, i + 1);
58	argv[argc] = NULL;
59	res = interp_builtin_cmd(argc, argv);
60	free(argv);
61	lua_pushinteger(L, res);
62
63	return 1;
64}
65
66static int
67lua_perform(lua_State *L)
68{
69	int	argc;
70	char	**argv;
71	int	res = 1;
72
73	if (parse(&argc, &argv, luaL_checkstring(L, 1)) == 0) {
74		res = interp_builtin_cmd(argc, argv);
75		free(argv);
76	}
77	lua_pushinteger(L, res);
78
79	return 1;
80}
81
82static int
83lua_command_error(lua_State *L)
84{
85
86	lua_pushstring(L, command_errbuf);
87	return 1;
88}
89
90/*
91 * Accepts a space-delimited loader command and runs it through the standard
92 * loader parsing, as if it were executed at the loader prompt by the user.
93 */
94static int
95lua_interpret(lua_State *L)
96{
97	const char	*interp_string;
98
99	if (lua_gettop(L) != 1) {
100		lua_pushnil(L);
101		return 1;
102	}
103
104	interp_string = luaL_checkstring(L, 1);
105	lua_pushinteger(L, interp_run(interp_string));
106	return 1;
107}
108
109static int
110lua_parse(lua_State *L)
111{
112	int	argc, nargc;
113	char	**argv;
114
115	if (parse(&argc, &argv, luaL_checkstring(L, 1)) == 0) {
116		for (nargc = 0; nargc < argc; ++nargc) {
117			lua_pushstring(L, argv[nargc]);
118		}
119		free(argv);
120		return nargc;
121	}
122
123	lua_pushnil(L);
124	return 1;
125}
126
127static int
128lua_getchar(lua_State *L)
129{
130
131	lua_pushinteger(L, getchar());
132	return 1;
133}
134
135static int
136lua_ischar(lua_State *L)
137{
138
139	lua_pushboolean(L, ischar());
140	return 1;
141}
142
143static int
144lua_gets(lua_State *L)
145{
146	char	buf[129];
147
148	ngets(buf, 128);
149	lua_pushstring(L, buf);
150	return 1;
151}
152
153static int
154lua_time(lua_State *L)
155{
156
157	lua_pushinteger(L, time(NULL));
158	return 1;
159}
160
161static int
162lua_delay(lua_State *L)
163{
164
165	delay((int)luaL_checknumber(L, 1));
166	return 0;
167}
168
169static int
170lua_getenv(lua_State *L)
171{
172	lua_pushstring(L, getenv(luaL_checkstring(L, 1)));
173
174	return 1;
175}
176
177static int
178lua_setenv(lua_State *L)
179{
180	const char *key, *val;
181
182	key = luaL_checkstring(L, 1);
183	val = luaL_checkstring(L, 2);
184	lua_pushinteger(L, setenv(key, val, 1));
185
186	return 1;
187}
188
189static int
190lua_unsetenv(lua_State *L)
191{
192	const char	*ev;
193
194	ev = luaL_checkstring(L, 1);
195	lua_pushinteger(L, unsetenv(ev));
196
197	return 1;
198}
199
200static int
201lua_printc(lua_State *L)
202{
203	ssize_t cur, l;
204	const char *s = luaL_checklstring(L, 1, &l);
205
206	for (cur = 0; cur < l; ++cur)
207		putchar((unsigned char)*(s++));
208
209	return 1;
210}
211
212static int
213lua_openfile(lua_State *L)
214{
215	const char	*mode, *str;
216	int	nargs;
217
218	nargs = lua_gettop(L);
219	if (nargs < 1 || nargs > 2) {
220		lua_pushnil(L);
221		return 1;
222	}
223	str = lua_tostring(L, 1);
224	mode = "r";
225	if (nargs > 1) {
226		mode = lua_tostring(L, 2);
227		if (mode == NULL) {
228			lua_pushnil(L);
229			return 1;
230		}
231	}
232	FILE * f = fopen(str, mode);
233	if (f != NULL) {
234		FILE ** ptr = (FILE**)lua_newuserdata(L, sizeof(FILE**));
235		*ptr = f;
236	} else
237		lua_pushnil(L);
238	return 1;
239}
240
241static int
242lua_closefile(lua_State *L)
243{
244	FILE ** f;
245	if (lua_gettop(L) != 1) {
246		lua_pushboolean(L, 0);
247		return 1;
248	}
249
250	f = (FILE**)lua_touserdata(L, 1);
251	if (f != NULL && *f != NULL) {
252		lua_pushboolean(L, fclose(*f) == 0 ? 1 : 0);
253		*f = NULL;
254	} else
255		lua_pushboolean(L, 0);
256
257	return 1;
258}
259
260static int
261lua_readfile(lua_State *L)
262{
263	FILE	**f;
264	size_t	size, r;
265	char * buf;
266
267	if (lua_gettop(L) < 1 || lua_gettop(L) > 2) {
268		lua_pushnil(L);
269		lua_pushinteger(L, 0);
270		return 2;
271	}
272
273	f = (FILE**)lua_touserdata(L, 1);
274
275	if (f == NULL || *f == NULL) {
276		lua_pushnil(L);
277		lua_pushinteger(L, 0);
278		return 2;
279	}
280
281	if (lua_gettop(L) == 2)
282		size = (size_t)lua_tonumber(L, 2);
283	else
284		size = (*f)->size;
285
286
287	buf = (char*)malloc(size);
288	r = fread(buf, 1, size, *f);
289	lua_pushlstring(L, buf, r);
290	free(buf);
291	lua_pushinteger(L, r);
292
293	return 2;
294}
295
296/*
297 * Implements io.write(file, ...)
298 * Any number of string and number arguments may be passed to it,
299 * and it will return the number of bytes written, or nil, an error string, and
300 * the errno.
301 */
302static int
303lua_writefile(lua_State *L)
304{
305	FILE	**f;
306	const char	*buf;
307	int	i, nargs;
308	size_t	bufsz, w, wrsz;
309
310	buf = NULL;
311	bufsz = 0;
312	w = 0;
313	wrsz = 0;
314	nargs = lua_gettop(L);
315	if (nargs < 2) {
316		errno = EINVAL;
317		return luaL_fileresult(L, 0, NULL);
318	}
319
320	f = (FILE**)lua_touserdata(L, 1);
321
322	if (f == NULL || *f == NULL) {
323		errno = EINVAL;
324		return luaL_fileresult(L, 0, NULL);
325	}
326
327	/* Do a validation pass first */
328	for (i = 0; i < nargs - 1; i++) {
329		/*
330		 * With Lua's API, lua_isstring really checks if the argument
331		 * is a string or a number.  The latter will be implicitly
332		 * converted to a string by our later call to lua_tolstring.
333		 */
334		if (!lua_isstring(L, i + 2)) {
335			errno = EINVAL;
336			return luaL_fileresult(L, 0, NULL);
337		}
338	}
339	for (i = 0; i < nargs - 1; i++) {
340		/* We've already validated; there's no chance of failure */
341		buf = lua_tolstring(L, i + 2, &bufsz);
342		wrsz = fwrite(buf, 1, bufsz, *f);
343		if (wrsz < bufsz)
344			return luaL_fileresult(L, 0, NULL);
345		w += wrsz;
346	}
347	lua_pushinteger(L, w);
348	return 1;
349}
350
351/*
352 * put image using terminal coordinates.
353 */
354static int
355lua_term_putimage(lua_State *L)
356{
357	const char *name;
358	png_t png;
359	uint32_t x1, y1, x2, y2, f;
360	int nargs, ret = 0, error;
361
362	nargs = lua_gettop(L);
363	if (nargs != 6) {
364		lua_pushboolean(L, 0);
365		return 1;
366	}
367
368	name = luaL_checkstring(L, 1);
369	x1 = luaL_checknumber(L, 2);
370	y1 = luaL_checknumber(L, 3);
371	x2 = luaL_checknumber(L, 4);
372	y2 = luaL_checknumber(L, 5);
373	f = luaL_checknumber(L, 6);
374
375	x1 = gfx_state.tg_origin.tp_col + x1 * gfx_state.tg_font.vf_width;
376	y1 = gfx_state.tg_origin.tp_row + y1 * gfx_state.tg_font.vf_height;
377	if (x2 != 0) {
378		x2 = gfx_state.tg_origin.tp_col +
379		    x2 * gfx_state.tg_font.vf_width;
380	}
381	if (y2 != 0) {
382		y2 = gfx_state.tg_origin.tp_row +
383		    y2 * gfx_state.tg_font.vf_height;
384	}
385
386	if ((error = png_open(&png, name)) != PNG_NO_ERROR) {
387		if (f & FL_PUTIMAGE_DEBUG)
388			printf("%s\n", png_error_string(error));
389	} else {
390		if (gfx_fb_putimage(&png, x1, y1, x2, y2, f) == 0)
391			ret = 1;
392		(void) png_close(&png);
393	}
394	lua_pushboolean(L, ret);
395	return 1;
396}
397
398static int
399lua_fb_putimage(lua_State *L)
400{
401	const char *name;
402	png_t png;
403	uint32_t x1, y1, x2, y2, f;
404	int nargs, ret = 0, error;
405
406	nargs = lua_gettop(L);
407	if (nargs != 6) {
408		lua_pushboolean(L, 0);
409		return 1;
410	}
411
412	name = luaL_checkstring(L, 1);
413	x1 = luaL_checknumber(L, 2);
414	y1 = luaL_checknumber(L, 3);
415	x2 = luaL_checknumber(L, 4);
416	y2 = luaL_checknumber(L, 5);
417	f = luaL_checknumber(L, 6);
418
419	if ((error = png_open(&png, name)) != PNG_NO_ERROR) {
420		if (f & FL_PUTIMAGE_DEBUG)
421			printf("%s\n", png_error_string(error));
422	} else {
423		if (gfx_fb_putimage(&png, x1, y1, x2, y2, f) == 0)
424			ret = 1;
425		(void) png_close(&png);
426	}
427	lua_pushboolean(L, ret);
428	return 1;
429}
430
431static int
432lua_fb_setpixel(lua_State *L)
433{
434	uint32_t x, y;
435	int nargs;
436
437	nargs = lua_gettop(L);
438	if (nargs != 2) {
439		lua_pushnil(L);
440		return 1;
441	}
442
443	x = luaL_checknumber(L, 1);
444	y = luaL_checknumber(L, 2);
445        gfx_fb_setpixel(x, y);
446	return 0;
447}
448
449static int
450lua_fb_line(lua_State *L)
451{
452	uint32_t x0, y0, x1, y1, wd;
453	int nargs;
454
455	nargs = lua_gettop(L);
456	if (nargs != 5) {
457		lua_pushnil(L);
458		return 1;
459	}
460
461	x0 = luaL_checknumber(L, 1);
462	y0 = luaL_checknumber(L, 2);
463	x1 = luaL_checknumber(L, 3);
464	y1 = luaL_checknumber(L, 4);
465	wd = luaL_checknumber(L, 5);
466        gfx_fb_line(x0, y0, x1, y1, wd);
467	return 0;
468}
469
470static int
471lua_fb_bezier(lua_State *L)
472{
473	uint32_t x0, y0, x1, y1, x2, y2, width;
474	int nargs;
475
476	nargs = lua_gettop(L);
477	if (nargs != 7) {
478		lua_pushnil(L);
479		return 1;
480	}
481
482	x0 = luaL_checknumber(L, 1);
483	y0 = luaL_checknumber(L, 2);
484	x1 = luaL_checknumber(L, 3);
485	y1 = luaL_checknumber(L, 4);
486	x2 = luaL_checknumber(L, 5);
487	y2 = luaL_checknumber(L, 6);
488	width = luaL_checknumber(L, 7);
489        gfx_fb_bezier(x0, y0, x1, y1, x2, y2, width);
490	return 0;
491}
492
493static int
494lua_fb_drawrect(lua_State *L)
495{
496	uint32_t x0, y0, x1, y1, fill;
497	int nargs;
498
499	nargs = lua_gettop(L);
500	if (nargs != 5) {
501		lua_pushnil(L);
502		return 1;
503	}
504
505	x0 = luaL_checknumber(L, 1);
506	y0 = luaL_checknumber(L, 2);
507	x1 = luaL_checknumber(L, 3);
508	y1 = luaL_checknumber(L, 4);
509	fill = luaL_checknumber(L, 5);
510        gfx_fb_drawrect(x0, y0, x1, y1, fill);
511	return 0;
512}
513
514static int
515lua_term_drawrect(lua_State *L)
516{
517	uint32_t x0, y0, x1, y1;
518	int nargs;
519
520	nargs = lua_gettop(L);
521	if (nargs != 4) {
522		lua_pushnil(L);
523		return 1;
524	}
525
526	x0 = luaL_checknumber(L, 1);
527	y0 = luaL_checknumber(L, 2);
528	x1 = luaL_checknumber(L, 3);
529	y1 = luaL_checknumber(L, 4);
530        gfx_term_drawrect(x0, y0, x1, y1);
531	return 0;
532}
533
534#define REG_SIMPLE(n)	{ #n, lua_ ## n }
535static const struct luaL_Reg loaderlib[] = {
536	REG_SIMPLE(delay),
537	REG_SIMPLE(command_error),
538	REG_SIMPLE(command),
539	REG_SIMPLE(interpret),
540	REG_SIMPLE(parse),
541	REG_SIMPLE(getenv),
542	REG_SIMPLE(perform),
543	/* Also registered as the global 'printc' */
544	REG_SIMPLE(printc),
545	REG_SIMPLE(setenv),
546	REG_SIMPLE(time),
547	REG_SIMPLE(unsetenv),
548	REG_SIMPLE(fb_bezier),
549	REG_SIMPLE(fb_drawrect),
550	REG_SIMPLE(fb_line),
551	REG_SIMPLE(fb_putimage),
552	REG_SIMPLE(fb_setpixel),
553	REG_SIMPLE(term_drawrect),
554	REG_SIMPLE(term_putimage),
555	{ NULL, NULL },
556};
557
558static const struct luaL_Reg iolib[] = {
559	{ "close", lua_closefile },
560	REG_SIMPLE(getchar),
561	REG_SIMPLE(gets),
562	REG_SIMPLE(ischar),
563	{ "open", lua_openfile },
564	{ "read", lua_readfile },
565	{ "write", lua_writefile },
566	{ NULL, NULL },
567};
568#undef REG_SIMPLE
569
570int
571luaopen_loader(lua_State *L)
572{
573	luaL_newlib(L, loaderlib);
574	/* Add loader.machine and loader.machine_arch properties */
575	lua_pushstring(L, MACHINE);
576	lua_setfield(L, -2, "machine");
577	lua_pushstring(L, MACHINE_ARCH);
578	lua_setfield(L, -2, "machine_arch");
579	lua_pushstring(L, LUA_PATH);
580	lua_setfield(L, -2, "lua_path");
581	/* Set global printc to loader.printc */
582	lua_register(L, "printc", lua_printc);
583	return 1;
584}
585
586int
587luaopen_io(lua_State *L)
588{
589	luaL_newlib(L, iolib);
590	return 1;
591}
592