contrib/bsdinstaller-1.1.6/src/lib/lua/dfui/common.c

   1 /*
   2  * Copyright (c) 2004 Scott Ullrich <GeekGod@GeekGod.com>
   3  * Portions Copyright (c) 2004 Chris Pressey <cpressey@catseye.mine.nu>
   4  *
   5  * Copyright (c) 2004 The DragonFly Project.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The DragonFly Project
   9  * by Scott Ullrich and Chris Pressey (see above for e-mail addresses).
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  *
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in
  20  *    the documentation and/or other materials provided with the
  21  *    distribution.
  22  *
  23  * 3. Neither the name of The DragonFly Project nor the names of its
  24  *    contributors may be used to endorse or promote products derived
  25  *    from this software without specific, prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  30  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  31  * COPYRIGHT HOLDERS, CONTRIBUTORS OR VOICES IN THE AUTHOR'S HEAD
  32  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY
  33  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  34  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  35  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  36  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  37  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  38  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  40  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  41  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  43  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  44  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  45  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  46  * SUCH DAMAGE.
  47  */
  48
  49 /*
  50  * common.c - common functions for dfuibe_lua
  51  * $Id: common.c,v 1.56 2005/04/04 13:56:37 den Exp $
  52  */
  53
  54 #include <sys/stat.h>
  55 #include <sys/types.h>
  56
  57 #include <dirent.h>
  58 #include <err.h>
  59 #include <stdio.h>
  60 #include <string.h>
  61 #include <sysexits.h>
  62 #include <unistd.h>
  63
  64 #include "lua50/lua.h"
  65 #include "lua50/lauxlib.h"
  66 #include "lua50/lualib.h"
  67
  68 #include "lua_dfui.h"
  69
  70 /*----------------------------- utilities ---------------------------*/
  71
  72 /*
  73  * Given the names of two global variables, the first a regular
  74  * 'Class' table, and the second a metatable which will be attached
  75  * to all object 'instances':
  76  * - add an __index property to the metatable that redirects
  77  *   all accesses on the instance to the class table;
  78  * - add a __metatable propery to the metatable, to hide it.
  79  */
  80 void
  81 lua_set_instance_handler(lua_State *L,
  82                          const char *table_name, const char *metatable_name)
  83 {
  84         int metatable_idx, methods_idx;
  85
  86         lua_pushstring(L, table_name);          /* name of our 'class' table */
  87         lua_gettable(L, LUA_GLOBALSINDEX);      /* get it from globals */
  88         methods_idx = lua_gettop(L);            /* Find its position on the stack */
  89
  90         lua_pushstring(L, metatable_name);      /* name of our metatable */
  91         lua_gettable(L, LUA_GLOBALSINDEX);      /* get it from globals */
  92         metatable_idx = lua_gettop(L);          /* Find its position on the stack */
  93
  94         /*
  95          * Add __index event to metatable (metatable.__index = methods).
  96          * This lets the Lua script refer to the methods by indexing
  97          * the instance variable like so: x:y(z).
  98          */
  99         lua_pushliteral(L, "__index");
 100         lua_pushvalue(L, methods_idx);
 101         lua_settable(L, metatable_idx);
 102
 103         lua_pushliteral(L, "__metatable");      /* hide metatable */
 104         lua_pushvalue(L, methods_idx);
 105         lua_settable(L, metatable_idx);         /* metatable.__metatable = methods */
 106
 107         lua_pop(L, 2);
 108 }
 109
 110 /*
 111  * Retrieve a string from a Lua table.
 112  */
 113 const char *
 114 lua_access_table_string(lua_State *L, int table_idx, const char *key)
 115 {
 116         const char *s;
 117
 118         lua_pushlstring(L, key, strlen(key));
 119         lua_gettable(L, table_idx);
 120         if (lua_isstring(L, lua_gettop(L))) {
 121                 s = luaL_checkstring(L, lua_gettop(L));
 122         } else {
 123                 s = "";
 124         }
 125         lua_pop(L, 1);
 126
 127         return(s);
 128 }
 129
 130 /*
 131  * This function is adapted from liolib.c: push a FILE * onto the
 132  * Lua stack as a file object that Lua's file module understands.
 133  */
 134 void
 135 lua_pushfileptr(lua_State *L, FILE *f)
 136 {
 137         FILE **pf;
 138
 139         pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
 140         *pf = f;
 141         luaL_getmetatable(L, "FILE*");
 142         lua_setmetatable(L, -2);
 143 }
 144
 145 void
 146 lua_show_debug(lua_State *L)
 147 {
 148         lua_Debug X;
 149
 150         lua_getstack(L, 0, &X);
 151         lua_getinfo(L, "nluS", &X);
 152         fprintf(stderr, "--+-- BEGIN Lua Debug Info --+--\n");
 153         fprintf(stderr, "source:      %s\n", X.short_src);
 154         fprintf(stderr, "linedefined: %d\n", X.linedefined);
 155         fprintf(stderr, "what:        %s\n", X.what);
 156         fprintf(stderr, "name:        %s\n", X.name);
 157         fprintf(stderr, "namewhat:    %s\n", X.namewhat);
 158         fprintf(stderr, "nups:        %d\n", X.nups);
 159         fprintf(stderr, "--+--  END  Lua Debug Info --+--\n");
 160 }
 161
 162 /*------------------------ module entry point ----------------------*/
 163
 164 LUA_API int
 165 luaopen_ldfui(lua_State *L)
 166 {
 167         int container_idx;
 168
 169         /*
 170          * Push a new table, which will contain all of our sub-packages,
 171          * and right before it, push the name that we will give it.
 172          */
 173         lua_pushstring(L, "DFUI");
 174         lua_newtable(L);
 175
 176         /*
 177          * Find out where the table is, so we can refer to it easily.
 178          */
 179         container_idx = lua_gettop(L);
 180
 181         /*
 182          * Initialize each sub-package and push it on the stack, then
 183          * assign it to a slot in our master table.
 184          */
 185
 186         lua_pushliteral(L, "Connection");
 187         lua_dfui_register(L);
 188         lua_settable(L, container_idx);
 189
 190         lua_pushliteral(L, "Progress");
 191         lua_dfui_progress_register(L);
 192         lua_settable(L, container_idx);
 193
 194         /*
 195          * Now that all that is done, put our master table into the
 196          * globals table, using the name we gave it at the beginning.
 197          */
 198         lua_settable(L, LUA_GLOBALSINDEX);
 199
 200         /*
 201          * Get our master table out of the globals and push it onto
 202          * the stack, so we can return it to whatever script require()d us.
 203          */
 204         lua_pushstring(L, "DFUI");
 205         lua_gettable(L, LUA_GLOBALSINDEX);
 206
 207         return(1);
 208 }