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annotate src/except.c @ 0:4b915342e2a8

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LuaSocket 2.0.2 + CMake build description.
author Eric Wing <ewing . public |-at-| gmail . com>
date Tue, 26 Aug 2008 18:40:01 -0700
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4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
Eric Wing <ewing . public |-at-| gmail . com>
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1 /*=========================================================================*\
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2 * Simple exception support
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3 * LuaSocket toolkit
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4 *
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5 * RCS ID: $Id: except.c,v 1.8 2005/09/29 06:11:41 diego Exp $
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6 \*=========================================================================*/
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7 #include <stdio.h>
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8
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9 #include "lua.h"
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10 #include "lauxlib.h"
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11
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12 #include "except.h"
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13
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14 /*=========================================================================*\
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15 * Internal function prototypes.
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16 \*=========================================================================*/
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17 static int global_protect(lua_State *L);
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18 static int global_newtry(lua_State *L);
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19 static int protected_(lua_State *L);
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20 static int finalize(lua_State *L);
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21 static int do_nothing(lua_State *L);
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22
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23 /* except functions */
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24 static luaL_reg func[] = {
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25 {"newtry", global_newtry},
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26 {"protect", global_protect},
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27 {NULL, NULL}
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28 };
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29
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30 /*-------------------------------------------------------------------------*\
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31 * Try factory
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32 \*-------------------------------------------------------------------------*/
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33 static void wrap(lua_State *L) {
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34 lua_newtable(L);
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35 lua_pushnumber(L, 1);
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36 lua_pushvalue(L, -3);
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37 lua_settable(L, -3);
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38 lua_insert(L, -2);
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39 lua_pop(L, 1);
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40 }
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41
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42 static int finalize(lua_State *L) {
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43 if (!lua_toboolean(L, 1)) {
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44 lua_pushvalue(L, lua_upvalueindex(1));
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45 lua_pcall(L, 0, 0, 0);
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46 lua_settop(L, 2);
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47 wrap(L);
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48 lua_error(L);
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49 return 0;
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50 } else return lua_gettop(L);
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51 }
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52
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53 static int do_nothing(lua_State *L) {
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54 (void) L;
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55 return 0;
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56 }
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57
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58 static int global_newtry(lua_State *L) {
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59 lua_settop(L, 1);
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60 if (lua_isnil(L, 1)) lua_pushcfunction(L, do_nothing);
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61 lua_pushcclosure(L, finalize, 1);
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62 return 1;
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63 }
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64
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65 /*-------------------------------------------------------------------------*\
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66 * Protect factory
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67 \*-------------------------------------------------------------------------*/
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68 static int unwrap(lua_State *L) {
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69 if (lua_istable(L, -1)) {
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70 lua_pushnumber(L, 1);
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71 lua_gettable(L, -2);
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72 lua_pushnil(L);
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73 lua_insert(L, -2);
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74 return 1;
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75 } else return 0;
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76 }
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77
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78 static int protected_(lua_State *L) {
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79 lua_pushvalue(L, lua_upvalueindex(1));
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80 lua_insert(L, 1);
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81 if (lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0) != 0) {
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82 if (unwrap(L)) return 2;
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83 else lua_error(L);
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84 return 0;
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85 } else return lua_gettop(L);
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86 }
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87
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88 static int global_protect(lua_State *L) {
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89 lua_pushcclosure(L, protected_, 1);
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90 return 1;
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91 }
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92
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93 /*-------------------------------------------------------------------------*\
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94 * Init module
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95 \*-------------------------------------------------------------------------*/
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96 int except_open(lua_State *L) {
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97 luaL_openlib(L, NULL, func, 0);
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98 return 0;
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99 }