prosody
6eb5d2bb11af
util-src/windows.c

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util-src/windows.c @ 10921:6eb5d2bb11af

util-src: Use the luaL_pushfail API added in Lua 5.4 to highlight all failure conditions Actually just an alias of pushnil, but it does make it more obvious where the failure conditions are, which is good for readability.
author Kim Alvefur <zash@zash.se>
date Sun, 07 Jun 2020 02:25:56 +0200
parent 7889:b8d694646597
child 12575:1f6f05a98fcd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8 */
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9
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10 /*
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11 * windows.c
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12 * Windows support functions for Lua
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13 */
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14
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15 #include <stdio.h>
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16 #include <windows.h>
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17 #include <windns.h>
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18
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19 #include "lua.h"
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20 #include "lauxlib.h"
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21
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22 #if (LUA_VERSION_NUM == 501)
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23 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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24 #endif
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25 #if (LUA_VERSION_NUM < 504)
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26 #define luaL_pushfail lua_pushnil
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27 #endif
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28
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29 static int Lget_nameservers(lua_State *L) {
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30 char stack_buffer[1024]; // stack allocated buffer
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31 IP4_ARRAY *ips = (IP4_ARRAY *) stack_buffer;
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32 DWORD len = sizeof(stack_buffer);
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33 DNS_STATUS status;
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34
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35 status = DnsQueryConfig(DnsConfigDnsServerList, FALSE, NULL, NULL, ips, &len);
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36
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37 if(status == 0) {
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38 DWORD i;
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39 lua_createtable(L, ips->AddrCount, 0);
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40
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41 for(i = 0; i < ips->AddrCount; i++) {
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42 DWORD ip = ips->AddrArray[i];
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43 char ip_str[16] = "";
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44 sprintf_s(ip_str, sizeof(ip_str), "%d.%d.%d.%d", (ip >> 0) & 255, (ip >> 8) & 255, (ip >> 16) & 255, (ip >> 24) & 255);
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45 lua_pushstring(L, ip_str);
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46 lua_rawseti(L, -2, i + 1);
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47 }
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48
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49 return 1;
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50 } else {
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51 luaL_pushfail(L);
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52 lua_pushfstring(L, "DnsQueryConfig returned %d", status);
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53 return 2;
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54 }
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55 }
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56
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57 static int lerror(lua_State *L, char *string) {
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58 luaL_pushfail(L);
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59 lua_pushfstring(L, "%s: %d", string, GetLastError());
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60 return 2;
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61 }
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62
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63 static int Lget_consolecolor(lua_State *L) {
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64 HWND console = GetStdHandle(STD_OUTPUT_HANDLE);
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65 WORD color;
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66 DWORD read_len;
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67
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68 CONSOLE_SCREEN_BUFFER_INFO info;
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69
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70 if(console == INVALID_HANDLE_VALUE) {
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71 return lerror(L, "GetStdHandle");
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72 }
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73
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74 if(!GetConsoleScreenBufferInfo(console, &info)) {
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75 return lerror(L, "GetConsoleScreenBufferInfo");
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76 }
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77
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78 if(!ReadConsoleOutputAttribute(console, &color, 1, info.dwCursorPosition, &read_len)) {
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79 return lerror(L, "ReadConsoleOutputAttribute");
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80 }
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81
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82 lua_pushnumber(L, color);
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83 return 1;
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84 }
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85 static int Lset_consolecolor(lua_State *L) {
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86 int color = luaL_checkint(L, 1);
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87 HWND console = GetStdHandle(STD_OUTPUT_HANDLE);
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88
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89 if(console == INVALID_HANDLE_VALUE) {
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90 return lerror(L, "GetStdHandle");
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91 }
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92
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93 if(!SetConsoleTextAttribute(console, color)) {
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94 return lerror(L, "SetConsoleTextAttribute");
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95 }
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96
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97 lua_pushboolean(L, 1);
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98 return 1;
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99 }
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100
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101 static const luaL_Reg Reg[] = {
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102 { "get_nameservers", Lget_nameservers },
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103 { "get_consolecolor", Lget_consolecolor },
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104 { "set_consolecolor", Lset_consolecolor },
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105 { NULL, NULL }
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106 };
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107
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108 LUALIB_API int luaopen_util_windows(lua_State *L) {
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109 #if (LUA_VERSION_NUM > 501)
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110 luaL_checkversion(L);
54669df178c2 util-src: Make C modules assert that the Lua runtime matches what it was compiled for
Kim Alvefur <zash@zash.se>
parents: 6789
diff changeset
111 #endif
6411
6c8f6364bc48 util-src/*.c: Don't create globals when loaded
Kim Alvefur <zash@zash.se>
parents: 5864
diff changeset
112 lua_newtable(L);
6789
6b180e77c97a util-src/*.c: Invert Lua 5.2 compat to be 5.2+ by default and a macro to support 5.1
Kim Alvefur <zash@zash.se>
parents: 6615
diff changeset
113 luaL_setfuncs(L, Reg, 0);
2924
8dc4e2e00129 util.windows: Convert from Windows line endings
Matthew Wild <mwild1@gmail.com>
parents: 2923
diff changeset
114 lua_pushliteral(L, "-3.14");
6412
0e94f89d0e62 util-src/*.c: Use the more concise lua_setfield
Kim Alvefur <zash@zash.se>
parents: 6411
diff changeset
115 lua_setfield(L, -2, "version");
2924
8dc4e2e00129 util.windows: Convert from Windows line endings
Matthew Wild <mwild1@gmail.com>
parents: 2923
diff changeset
116 return 1;
8dc4e2e00129 util.windows: Convert from Windows line endings
Matthew Wild <mwild1@gmail.com>
parents: 2923
diff changeset
117 }