File: auxiliar.c

package info (click to toggle)
luasocket 3.0~rc1%2Bgit%2Bac3201d-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster
  • size: 2,216 kB
  • sloc: ansic: 4,487; makefile: 320; sh: 116
file content (158 lines) | stat: -rw-r--r-- 6,323 bytes parent folder | download | duplicates (9)
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
/*=========================================================================*\
* Auxiliar routines for class hierarchy manipulation
* LuaSocket toolkit
\*=========================================================================*/
#include <string.h>
#include <stdio.h>

#include "auxiliar.h"

/*=========================================================================*\
* Exported functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Initializes the module
\*-------------------------------------------------------------------------*/
int auxiliar_open(lua_State *L) {
    (void) L;
    return 0;
}

/*-------------------------------------------------------------------------*\
* Creates a new class with given methods
* Methods whose names start with __ are passed directly to the metatable.
\*-------------------------------------------------------------------------*/
void auxiliar_newclass(lua_State *L, const char *classname, luaL_Reg *func) {
    luaL_newmetatable(L, classname); /* mt */
    /* create __index table to place methods */
    lua_pushstring(L, "__index");    /* mt,"__index" */
    lua_newtable(L);                 /* mt,"__index",it */
    /* 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 */
    /* pass all methods that start with _ to the metatable, and all others
     * to the index table */
    for (; func->name; func++) {     /* mt,"__index",it */
        lua_pushstring(L, func->name);
        lua_pushcfunction(L, func->func);
        lua_rawset(L, func->name[0] == '_' ? -5: -3);
    }
    lua_rawset(L, -3);               /* mt */
    lua_pop(L, 1);
}

/*-------------------------------------------------------------------------*\
* Prints the value of a class in a nice way
\*-------------------------------------------------------------------------*/
int auxiliar_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, "%s: %s", lua_tostring(L, -1), buf);
    return 1;
error:
    lua_pushstring(L, "invalid object passed to 'auxiliar.c:__tostring'");
    lua_error(L);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Insert class into group
\*-------------------------------------------------------------------------*/
void auxiliar_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 auxiliar_checkboolean(lua_State *L, int objidx) {
    if (!lua_isboolean(L, objidx))
        auxiliar_typeerror(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 *auxiliar_checkclass(lua_State *L, const char *classname, int objidx) {
    void *data = auxiliar_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 *auxiliar_checkgroup(lua_State *L, const char *groupname, int objidx) {
    void *data = auxiliar_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 auxiliar_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 *auxiliar_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 *auxiliar_getclassudata(lua_State *L, const char *classname, int objidx) {
    return luaL_checkudata(L, objidx, classname);
}

/*-------------------------------------------------------------------------*\
* Throws error when argument does not have correct type.
* Used to be part of lauxlib in Lua 5.1, was dropped from 5.2.
\*-------------------------------------------------------------------------*/
int auxiliar_typeerror (lua_State *L, int narg, const char *tname) {
  const char *msg = lua_pushfstring(L, "%s expected, got %s", tname,
      luaL_typename(L, narg));
  return luaL_argerror(L, narg, msg);
}