parchment/parchment.c at trunk · vtrlx/parchment · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/* parchment.c (startup and support code for Parchment)
Copyright © 2024–2025 Victoria Lacroix

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 <https://www.gnu.org/licenses/>. */

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>

#ifdef DEVEL
#define APP_ID "ca.vtrlx.Parchment.Devel"
#else
#define APP_ID "ca.vtrlx.Parchment"
#endif

#define QUOTE(name) #name
#define MSTR(macro) QUOTE(macro)

static int
get_is_devel_lua(lua_State *L)
{
#ifdef DEVEL
	lua_pushboolean(L, 1);
#else
	lua_pushboolean(L, 0);
#endif
	return 1;
}

static int
get_app_id_lua(lua_State *L)
{
	lua_pushstring(L, APP_ID);
	return 1;
}

static int
get_app_ver_lua(lua_State *L)
{
#ifdef VERSION
	lua_pushstring(L, MSTR(VERSION));
#else
#error("VERSION macro is not defined!")
#endif
	return 1;
}

static int standalone;
static int
get_is_standalone_lua(lua_State *L)
{
	lua_pushboolean(L, standalone);
	return 1;
}

static int argc;
static char **argv;
static int
get_cli_args_lua(lua_State *L)
/* Returns each argument given to the command line. */
{
	int i;
	for (i = 0; i < argc; ++i) {
		lua_pushstring(L, argv[i]);
	}
	return argc;
}

static const luaL_Reg parchmentlib[] = {
	{ "get_is_devel", get_is_devel_lua },
	{ "get_app_id", get_app_id_lua },
	{ "get_app_ver", get_app_ver_lua },
	{ "get_is_standalone", get_is_standalone_lua },
	{ "get_cli_args", get_cli_args_lua },
	/* sentinel item marking the end of the array */
	{ NULL, NULL },
};

const char parchment_bytecode[] = {
#embed "parchment.bytecode"
};

int
main(int _argc, char **_argv)
{
	lua_State *L;
	const char *message;
	int lua_result;

	standalone = 0;
	for (int i = 0; i < _argc; ++i)
		if (strcmp(_argv[i], "--standalone") == 0)
			standalone = 1;

	argc = _argc;
	argv = _argv;

	L = luaL_newstate();
	luaL_openlibs(L);
	lua_getglobal(L, "package");
	lua_getfield(L, -1, "loaded");
	lua_remove(L, -2);
	lua_pushstring(L, "parchmentlib");
	luaL_newlib(L, parchmentlib);
	lua_settable(L, -3);
	lua_remove(L, -1);

	lua_result = luaL_loadbuffer(L, parchment_bytecode, sizeof (parchment_bytecode), APP_ID);
	switch (lua_result) {
	case LUA_ERRSYNTAX:
		fprintf(stderr, "Failed to load Parchment: binary is malformed.\n");
		message = luaL_checkstring(L, -1);
		if (message)
			fprintf(stderr, "%s\n", message);
		return 1;
	case LUA_ERRMEM:
		fprintf(stderr, "Failed to load Parchment: could not allocate memory.\n");
		return 2;
	case LUA_OK:
		break;
	default:
		fprintf(stderr, "Failed to load Parchment: an unhandled error ocurred.\n");
		return -1;
	}

	lua_call(L, 0, 0);
	return 0;
}