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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*=========================================================================*\
* Auxiliar routines for class hierarchy manipulation
* LuaSocket toolkit
*
* RCS ID: $Id$
\*=========================================================================*/
#include <string.h>
#include <stdio.h>
#include "luasocket.h"
#include "auxiliar.h"
/*=========================================================================*\
* Exported functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Prints the value of a class in a nice way
\*-------------------------------------------------------------------------*/
int aux_meth_tostring(lua_State *L)
{
char buf[32];
if (!lua_getmetatable(L, 1)) goto error;
lua_pushstring(L, "__index");
lua_gettable(L, -2);
if (!lua_istable(L, -1)) goto error;
lua_pushstring(L, "class");
lua_gettable(L, -2);
if (!lua_isstring(L, -1)) goto error;
sprintf(buf, "%p", lua_touserdata(L, 1));
lua_pushfstring(L, "socket: %s: %s", lua_tostring(L, -1), buf);
return 1;
error:
lua_pushnil(L);
return 1;
}
/*-------------------------------------------------------------------------*\
* Initializes the module
\*-------------------------------------------------------------------------*/
int aux_open(lua_State *L)
{
return 0;
}
/*-------------------------------------------------------------------------*\
* Creates a new class with given methods
\*-------------------------------------------------------------------------*/
void aux_newclass(lua_State *L, const char *classname, luaL_reg *func)
{
luaL_newmetatable(L, classname); /* mt */
/* set __tostring metamethod */
lua_pushstring(L, "__tostring");
lua_pushcfunction(L, aux_meth_tostring);
lua_rawset(L, -3);
/* create __index table to place methods */
lua_pushstring(L, "__index"); /* mt,"__index" */
lua_newtable(L); /* mt,"__index",it */
luaL_openlib(L, NULL, func, 0);
/* put class name into class metatable */
lua_pushstring(L, "class"); /* mt,"__index",it,"class" */
lua_pushstring(L, classname); /* mt,"__index",it,"class",classname */
lua_rawset(L, -3); /* mt,"__index",it */
/* get __gc method from class and use it for garbage collection */
lua_pushstring(L, "__gc"); /* mt,"__index",it,"__gc" */
lua_pushstring(L, "__gc"); /* mt,"__index",it,"__gc","__gc" */
lua_rawget(L, -3); /* mt,"__index",it,"__gc",fn */
lua_rawset(L, -5); /* mt,"__index",it */
lua_rawset(L, -3); /* mt */
lua_pop(L, 1);
}
/*-------------------------------------------------------------------------*\
* Insert class into group
\*-------------------------------------------------------------------------*/
void aux_add2group(lua_State *L, const char *classname, const char *groupname)
{
luaL_getmetatable(L, classname);
lua_pushstring(L, groupname);
lua_pushboolean(L, 1);
lua_rawset(L, -3);
lua_pop(L, 1);
}
/*-------------------------------------------------------------------------*\
* Make sure argument is a boolean
\*-------------------------------------------------------------------------*/
int aux_checkboolean(lua_State *L, int objidx)
{
if (!lua_isboolean(L, objidx))
luaL_typerror(L, objidx, lua_typename(L, LUA_TBOOLEAN));
return lua_toboolean(L, objidx);
}
/*-------------------------------------------------------------------------*\
* Return userdata pointer if object belongs to a given class, abort with
* error otherwise
\*-------------------------------------------------------------------------*/
void *aux_checkclass(lua_State *L, const char *classname, int objidx)
{
void *data = aux_getclassudata(L, classname, objidx);
if (!data) {
char msg[45];
sprintf(msg, "%.35s expected", classname);
luaL_argerror(L, objidx, msg);
}
return data;
}
/*-------------------------------------------------------------------------*\
* Return userdata pointer if object belongs to a given group, abort with
* error otherwise
\*-------------------------------------------------------------------------*/
void *aux_checkgroup(lua_State *L, const char *groupname, int objidx)
{
void *data = aux_getgroupudata(L, groupname, objidx);
if (!data) {
char msg[45];
sprintf(msg, "%.35s expected", groupname);
luaL_argerror(L, objidx, msg);
}
return data;
}
/*-------------------------------------------------------------------------*\
* Set object class
\*-------------------------------------------------------------------------*/
void aux_setclass(lua_State *L, const char *classname, int objidx)
{
luaL_getmetatable(L, classname);
if (objidx < 0) objidx--;
lua_setmetatable(L, objidx);
}
/*-------------------------------------------------------------------------*\
* Get a userdata pointer if object belongs to a given group. Return NULL
* otherwise
\*-------------------------------------------------------------------------*/
void *aux_getgroupudata(lua_State *L, const char *groupname, int objidx)
{
if (!lua_getmetatable(L, objidx))
return NULL;
lua_pushstring(L, groupname);
lua_rawget(L, -2);
if (lua_isnil(L, -1)) {
lua_pop(L, 2);
return NULL;
} else {
lua_pop(L, 2);
return lua_touserdata(L, objidx);
}
}
/*-------------------------------------------------------------------------*\
* Get a userdata pointer if object belongs to a given class. Return NULL
* otherwise
\*-------------------------------------------------------------------------*/
void *aux_getclassudata(lua_State *L, const char *classname, int objidx)
{
return luaL_checkudata(L, objidx, classname);
}
/*-------------------------------------------------------------------------*\
* Accept "false" as nil
\*-------------------------------------------------------------------------*/
const char *aux_optlstring(lua_State *L, int n, const char *v, size_t *l)
{
if (lua_isnil(L, n) || (lua_isboolean(L, n) && !lua_toboolean(L, n))) {
*l = 0;
return NULL;
} else return luaL_optlstring(L, n, v, l);
}
|
