libs/luci-lib-nixio/src/protoent.c

   1 /*
   2  * nixio - Linux I/O library for lua
   3  *
   4  *   Copyright (C) 2011 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  *  Licensed under the Apache License, Version 2.0 (the "License");
   7  *  you may not use this file except in compliance with the License.
   8  *  You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  *  Unless required by applicable law or agreed to in writing, software
  13  *  distributed under the License is distributed on an "AS IS" BASIS,
  14  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  *  See the License for the specific language governing permissions and
  16  *  limitations under the License.
  17  */
  18
  19 #include "nixio.h"
  20
  21 #ifndef __WINNT__
  22 #include <netdb.h>
  23 #endif
  24
  25 /**
  26  * protoent conversion helper
  27  */
  28 static int nixio__pushprotoent(lua_State *L, struct protoent *e) {
  29         int i;
  30         if (e) {
  31                 lua_newtable(L);
  32
  33                 lua_pushstring(L, e->p_name);
  34                 lua_setfield(L, -2, "name");
  35
  36                 lua_pushnumber(L, e->p_proto);
  37                 lua_setfield(L, -2, "proto");
  38
  39                 lua_newtable(L);
  40                 for (i = 0; e->p_aliases[i]; i++) {
  41                         lua_pushstring(L, e->p_aliases[i]);
  42                         lua_rawseti(L, -2, i+1);
  43                 }
  44                 lua_setfield(L, -2, "aliases");
  45                 return 1;
  46         } else {
  47                 return 0;
  48         }
  49 }
  50
  51 /**
  52  * getprotobyname(name)
  53  */
  54 static int nixio_getprotobyname(lua_State *L) {
  55         const char *name = luaL_checkstring(L, 1);
  56         struct protoent *res = getprotobyname(name);
  57         return nixio__pushprotoent(L, res);
  58 }
  59
  60 /**
  61  * getprotobynumber(proto)
  62  */
  63 static int nixio_getprotobynumber(lua_State *L) {
  64         int proto = luaL_checkinteger(L, 1);
  65         struct protoent *res = getprotobynumber(proto);
  66         return nixio__pushprotoent(L, res);
  67 }
  68
  69 /**
  70  * getproto(name_or_proto)
  71  */
  72 static int nixio_getproto(lua_State *L) {
  73         int i = 1;
  74         struct protoent *res;
  75         if (lua_isnumber(L, 1)) {
  76                 return nixio_getprotobynumber(L);
  77         } else if (lua_isstring(L, 1)) {
  78                 return nixio_getprotobyname(L);
  79         } else if (lua_isnoneornil(L, 1)) {
  80                 setprotoent(1);
  81                 lua_newtable(L);
  82                 while ((res = getprotoent()) != NULL) {
  83                         nixio__pushprotoent(L, res);
  84                         lua_rawseti(L, -2, i++);
  85                 }
  86                 endprotoent();
  87                 return 1;
  88         } else {
  89                 return luaL_argerror(L, 1, "supported values: <protoname>, <protonumber>");
  90         }
  91 }
  92
  93 /* module table */
  94 static const luaL_reg R[] = {
  95     {"getprotobyname",          nixio_getprotobyname},
  96     {"getprotobynumber",        nixio_getprotobynumber},
  97     {"getproto",                        nixio_getproto},
  98     {NULL,                                      NULL}
  99 };
 100
 101 void nixio_open_protoent(lua_State *L) {
 102     luaL_register(L, NULL, R);
 103 }