1 | /* |
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2 | ** $Id: lauxlib.c,v 1.100 2003/04/07 14:35:00 roberto Exp $ |
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3 | ** Auxiliary functions for building Lua libraries |
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4 | ** See Copyright Notice in lua.h |
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5 | */ |
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6 | |
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7 | |
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8 | #include <ctype.h> |
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9 | #include <errno.h> |
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10 | #include <stdarg.h> |
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11 | #include <stdio.h> |
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12 | #include <string.h> |
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13 | |
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14 | |
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15 | /* This file uses only the official API of Lua. |
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16 | ** Any function declared here could be written as an application function. |
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17 | */ |
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18 | |
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19 | #define lauxlib_c |
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20 | |
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21 | #include "lua.h" |
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22 | |
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23 | #include "lauxlib.h" |
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24 | |
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25 | |
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26 | /* number of prereserved references (for internal use) */ |
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27 | #define RESERVED_REFS 2 |
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28 | |
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29 | /* reserved references */ |
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30 | #define FREELIST_REF 1 /* free list of references */ |
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31 | #define ARRAYSIZE_REF 2 /* array sizes */ |
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32 | |
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33 | |
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34 | /* convert a stack index to positive */ |
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35 | #define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \ |
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36 | lua_gettop(L) + (i) + 1) |
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37 | |
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38 | |
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39 | /* |
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40 | ** {====================================================== |
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41 | ** Error-report functions |
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42 | ** ======================================================= |
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43 | */ |
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44 | |
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45 | |
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46 | LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) { |
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47 | lua_Debug ar; |
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48 | lua_getstack(L, 0, &ar); |
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49 | lua_getinfo(L, "n", &ar); |
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50 | if (strcmp(ar.namewhat, "method") == 0) { |
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51 | narg--; /* do not count `self' */ |
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52 | if (narg == 0) /* error is in the self argument itself? */ |
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53 | return luaL_error(L, "calling `%s' on bad self (%s)", ar.name, extramsg); |
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54 | } |
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55 | if (ar.name == NULL) |
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56 | ar.name = "?"; |
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57 | return luaL_error(L, "bad argument #%d to `%s' (%s)", |
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58 | narg, ar.name, extramsg); |
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59 | } |
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60 | |
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61 | |
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62 | LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) { |
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63 | const char *msg = lua_pushfstring(L, "%s expected, got %s", |
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64 | tname, lua_typename(L, lua_type(L,narg))); |
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65 | return luaL_argerror(L, narg, msg); |
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66 | } |
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67 | |
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68 | |
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69 | static void tag_error (lua_State *L, int narg, int tag) { |
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70 | luaL_typerror(L, narg, lua_typename(L, tag)); |
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71 | } |
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72 | |
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73 | |
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74 | LUALIB_API void luaL_where (lua_State *L, int level) { |
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75 | lua_Debug ar; |
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76 | if (lua_getstack(L, level, &ar)) { /* check function at level */ |
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77 | lua_getinfo(L, "Snl", &ar); /* get info about it */ |
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78 | if (ar.currentline > 0) { /* is there info? */ |
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79 | lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline); |
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80 | return; |
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81 | } |
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82 | } |
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83 | lua_pushliteral(L, ""); /* else, no information available... */ |
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84 | } |
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85 | |
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86 | |
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87 | LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) { |
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88 | va_list argp; |
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89 | va_start(argp, fmt); |
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90 | luaL_where(L, 1); |
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91 | lua_pushvfstring(L, fmt, argp); |
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92 | va_end(argp); |
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93 | lua_concat(L, 2); |
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94 | return lua_error(L); |
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95 | } |
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96 | |
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97 | /* }====================================================== */ |
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98 | |
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99 | |
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100 | LUALIB_API int luaL_findstring (const char *name, const char *const list[]) { |
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101 | int i; |
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102 | for (i=0; list[i]; i++) |
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103 | if (strcmp(list[i], name) == 0) |
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104 | return i; |
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105 | return -1; /* name not found */ |
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106 | } |
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107 | |
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108 | |
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109 | LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) { |
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110 | lua_pushstring(L, tname); |
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111 | lua_rawget(L, LUA_REGISTRYINDEX); /* get registry.name */ |
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112 | if (!lua_isnil(L, -1)) /* name already in use? */ |
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113 | return 0; /* leave previous value on top, but return 0 */ |
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114 | lua_pop(L, 1); |
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115 | lua_newtable(L); /* create metatable */ |
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116 | lua_pushstring(L, tname); |
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117 | lua_pushvalue(L, -2); |
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118 | lua_rawset(L, LUA_REGISTRYINDEX); /* registry.name = metatable */ |
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119 | lua_pushvalue(L, -1); |
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120 | lua_pushstring(L, tname); |
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121 | lua_rawset(L, LUA_REGISTRYINDEX); /* registry[metatable] = name */ |
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122 | return 1; |
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123 | } |
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124 | |
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125 | |
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126 | LUALIB_API void luaL_getmetatable (lua_State *L, const char *tname) { |
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127 | lua_pushstring(L, tname); |
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128 | lua_rawget(L, LUA_REGISTRYINDEX); |
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129 | } |
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130 | |
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131 | |
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132 | LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) { |
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133 | const char *tn; |
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134 | if (!lua_getmetatable(L, ud)) return NULL; /* no metatable? */ |
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135 | lua_rawget(L, LUA_REGISTRYINDEX); /* get registry[metatable] */ |
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136 | tn = lua_tostring(L, -1); |
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137 | if (tn && (strcmp(tn, tname) == 0)) { |
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138 | lua_pop(L, 1); |
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139 | return lua_touserdata(L, ud); |
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140 | } |
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141 | else { |
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142 | lua_pop(L, 1); |
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143 | return NULL; |
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144 | } |
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145 | } |
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146 | |
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147 | |
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148 | LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) { |
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149 | if (!lua_checkstack(L, space)) |
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150 | luaL_error(L, "stack overflow (%s)", mes); |
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151 | } |
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152 | |
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153 | |
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154 | LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) { |
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155 | if (lua_type(L, narg) != t) |
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156 | tag_error(L, narg, t); |
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157 | } |
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158 | |
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159 | |
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160 | LUALIB_API void luaL_checkany (lua_State *L, int narg) { |
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161 | if (lua_type(L, narg) == LUA_TNONE) |
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162 | luaL_argerror(L, narg, "value expected"); |
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163 | } |
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164 | |
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165 | |
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166 | LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) { |
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167 | const char *s = lua_tostring(L, narg); |
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168 | if (!s) tag_error(L, narg, LUA_TSTRING); |
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169 | if (len) *len = lua_strlen(L, narg); |
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170 | return s; |
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171 | } |
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172 | |
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173 | |
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174 | LUALIB_API const char *luaL_optlstring (lua_State *L, int narg, |
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175 | const char *def, size_t *len) { |
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176 | if (lua_isnoneornil(L, narg)) { |
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177 | if (len) |
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178 | *len = (def ? strlen(def) : 0); |
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179 | return def; |
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180 | } |
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181 | else return luaL_checklstring(L, narg, len); |
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182 | } |
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183 | |
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184 | |
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185 | LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) { |
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186 | lua_Number d = lua_tonumber(L, narg); |
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187 | if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */ |
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188 | tag_error(L, narg, LUA_TNUMBER); |
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189 | return d; |
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190 | } |
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191 | |
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192 | |
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193 | LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) { |
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194 | if (lua_isnoneornil(L, narg)) return def; |
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195 | else return luaL_checknumber(L, narg); |
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196 | } |
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197 | |
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198 | |
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199 | LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) { |
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200 | if (!lua_getmetatable(L, obj)) /* no metatable? */ |
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201 | return 0; |
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202 | lua_pushstring(L, event); |
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203 | lua_rawget(L, -2); |
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204 | if (lua_isnil(L, -1)) { |
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205 | lua_pop(L, 2); /* remove metatable and metafield */ |
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206 | return 0; |
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207 | } |
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208 | else { |
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209 | lua_remove(L, -2); /* remove only metatable */ |
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210 | return 1; |
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211 | } |
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212 | } |
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213 | |
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214 | |
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215 | LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) { |
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216 | obj = abs_index(L, obj); |
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217 | if (!luaL_getmetafield(L, obj, event)) /* no metafield? */ |
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218 | return 0; |
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219 | lua_pushvalue(L, obj); |
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220 | lua_call(L, 1, 1); |
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221 | return 1; |
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222 | } |
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223 | |
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224 | |
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225 | LUALIB_API void luaL_openlib (lua_State *L, const char *libname, |
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226 | const luaL_reg *l, int nup) { |
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227 | if (libname) { |
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228 | lua_pushstring(L, libname); |
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229 | lua_gettable(L, LUA_GLOBALSINDEX); /* check whether lib already exists */ |
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230 | if (lua_isnil(L, -1)) { /* no? */ |
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231 | lua_pop(L, 1); |
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232 | lua_newtable(L); /* create it */ |
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233 | lua_pushstring(L, libname); |
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234 | lua_pushvalue(L, -2); |
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235 | lua_settable(L, LUA_GLOBALSINDEX); /* register it with given name */ |
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236 | } |
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237 | lua_insert(L, -(nup+1)); /* move library table to below upvalues */ |
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238 | } |
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239 | for (; l->name; l++) { |
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240 | int i; |
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241 | lua_pushstring(L, l->name); |
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242 | for (i=0; i<nup; i++) /* copy upvalues to the top */ |
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243 | lua_pushvalue(L, -(nup+1)); |
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244 | lua_pushcclosure(L, l->func, nup); |
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245 | lua_settable(L, -(nup+3)); |
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246 | } |
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247 | lua_pop(L, nup); /* remove upvalues */ |
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248 | } |
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249 | |
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250 | |
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251 | |
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252 | /* |
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253 | ** {====================================================== |
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254 | ** getn-setn: size for arrays |
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255 | ** ======================================================= |
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256 | */ |
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257 | |
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258 | static int checkint (lua_State *L, int topop) { |
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259 | int n = (int)lua_tonumber(L, -1); |
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260 | if (n == 0 && !lua_isnumber(L, -1)) n = -1; |
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261 | lua_pop(L, topop); |
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262 | return n; |
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263 | } |
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264 | |
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265 | |
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266 | static void getsizes (lua_State *L) { |
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267 | lua_rawgeti(L, LUA_REGISTRYINDEX, ARRAYSIZE_REF); |
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268 | if (lua_isnil(L, -1)) { /* no `size' table? */ |
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269 | lua_pop(L, 1); /* remove nil */ |
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270 | lua_newtable(L); /* create it */ |
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271 | lua_pushvalue(L, -1); /* `size' will be its own metatable */ |
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272 | lua_setmetatable(L, -2); |
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273 | lua_pushliteral(L, "__mode"); |
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274 | lua_pushliteral(L, "k"); |
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275 | lua_rawset(L, -3); /* metatable(N).__mode = "k" */ |
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276 | lua_pushvalue(L, -1); |
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277 | lua_rawseti(L, LUA_REGISTRYINDEX, ARRAYSIZE_REF); /* store in register */ |
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278 | } |
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279 | } |
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280 | |
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281 | |
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282 | void luaL_setn (lua_State *L, int t, int n) { |
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283 | t = abs_index(L, t); |
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284 | lua_pushliteral(L, "n"); |
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285 | lua_rawget(L, t); |
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286 | if (checkint(L, 1) >= 0) { /* is there a numeric field `n'? */ |
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287 | lua_pushliteral(L, "n"); /* use it */ |
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288 | lua_pushnumber(L, (lua_Number)n); |
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289 | lua_rawset(L, t); |
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290 | } |
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291 | else { /* use `sizes' */ |
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292 | getsizes(L); |
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293 | lua_pushvalue(L, t); |
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294 | lua_pushnumber(L, (lua_Number)n); |
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295 | lua_rawset(L, -3); /* sizes[t] = n */ |
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296 | lua_pop(L, 1); /* remove `sizes' */ |
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297 | } |
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298 | } |
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299 | |
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300 | |
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301 | int luaL_getn (lua_State *L, int t) { |
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302 | int n; |
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303 | t = abs_index(L, t); |
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304 | lua_pushliteral(L, "n"); /* try t.n */ |
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305 | lua_rawget(L, t); |
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306 | if ((n = checkint(L, 1)) >= 0) return n; |
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307 | getsizes(L); /* else try sizes[t] */ |
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308 | lua_pushvalue(L, t); |
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309 | lua_rawget(L, -2); |
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310 | if ((n = checkint(L, 2)) >= 0) return n; |
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311 | for (n = 1; ; n++) { /* else must count elements */ |
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312 | lua_rawgeti(L, t, n); |
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313 | if (lua_isnil(L, -1)) break; |
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314 | lua_pop(L, 1); |
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315 | } |
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316 | lua_pop(L, 1); |
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317 | return n - 1; |
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318 | } |
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319 | |
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320 | /* }====================================================== */ |
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321 | |
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322 | |
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323 | |
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324 | /* |
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325 | ** {====================================================== |
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326 | ** Generic Buffer manipulation |
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327 | ** ======================================================= |
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328 | */ |
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329 | |
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330 | |
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331 | #define bufflen(B) ((B)->p - (B)->buffer) |
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332 | #define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B))) |
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333 | |
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334 | #define LIMIT (LUA_MINSTACK/2) |
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335 | |
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336 | |
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337 | static int emptybuffer (luaL_Buffer *B) { |
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338 | size_t l = bufflen(B); |
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339 | if (l == 0) return 0; /* put nothing on stack */ |
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340 | else { |
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341 | lua_pushlstring(B->L, B->buffer, l); |
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342 | B->p = B->buffer; |
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343 | B->lvl++; |
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344 | return 1; |
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345 | } |
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346 | } |
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347 | |
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348 | |
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349 | static void adjuststack (luaL_Buffer *B) { |
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350 | if (B->lvl > 1) { |
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351 | lua_State *L = B->L; |
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352 | int toget = 1; /* number of levels to concat */ |
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353 | size_t toplen = lua_strlen(L, -1); |
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354 | do { |
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355 | size_t l = lua_strlen(L, -(toget+1)); |
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356 | if (B->lvl - toget + 1 >= LIMIT || toplen > l) { |
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357 | toplen += l; |
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358 | toget++; |
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359 | } |
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360 | else break; |
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361 | } while (toget < B->lvl); |
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362 | lua_concat(L, toget); |
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363 | B->lvl = B->lvl - toget + 1; |
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364 | } |
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365 | } |
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366 | |
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367 | |
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368 | LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) { |
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369 | if (emptybuffer(B)) |
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370 | adjuststack(B); |
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371 | return B->buffer; |
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372 | } |
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373 | |
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374 | |
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375 | LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) { |
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376 | while (l--) |
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377 | luaL_putchar(B, *s++); |
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378 | } |
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379 | |
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380 | |
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381 | LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) { |
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382 | luaL_addlstring(B, s, strlen(s)); |
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383 | } |
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384 | |
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385 | |
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386 | LUALIB_API void luaL_pushresult (luaL_Buffer *B) { |
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387 | emptybuffer(B); |
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388 | lua_concat(B->L, B->lvl); |
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389 | B->lvl = 1; |
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390 | } |
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391 | |
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392 | |
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393 | LUALIB_API void luaL_addvalue (luaL_Buffer *B) { |
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394 | lua_State *L = B->L; |
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395 | size_t vl = lua_strlen(L, -1); |
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396 | if (vl <= bufffree(B)) { /* fit into buffer? */ |
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397 | memcpy(B->p, lua_tostring(L, -1), vl); /* put it there */ |
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398 | B->p += vl; |
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399 | lua_pop(L, 1); /* remove from stack */ |
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400 | } |
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401 | else { |
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402 | if (emptybuffer(B)) |
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403 | lua_insert(L, -2); /* put buffer before new value */ |
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404 | B->lvl++; /* add new value into B stack */ |
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405 | adjuststack(B); |
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406 | } |
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407 | } |
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408 | |
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409 | |
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410 | LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) { |
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411 | B->L = L; |
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412 | B->p = B->buffer; |
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413 | B->lvl = 0; |
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414 | } |
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415 | |
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416 | /* }====================================================== */ |
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417 | |
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418 | |
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419 | LUALIB_API int luaL_ref (lua_State *L, int t) { |
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420 | int ref; |
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421 | t = abs_index(L, t); |
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422 | if (lua_isnil(L, -1)) { |
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423 | lua_pop(L, 1); /* remove from stack */ |
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424 | return LUA_REFNIL; /* `nil' has a unique fixed reference */ |
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425 | } |
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426 | lua_rawgeti(L, t, FREELIST_REF); /* get first free element */ |
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427 | ref = (int)lua_tonumber(L, -1); /* ref = t[FREELIST_REF] */ |
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428 | lua_pop(L, 1); /* remove it from stack */ |
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429 | if (ref != 0) { /* any free element? */ |
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430 | lua_rawgeti(L, t, ref); /* remove it from list */ |
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431 | lua_rawseti(L, t, FREELIST_REF); /* (t[FREELIST_REF] = t[ref]) */ |
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432 | } |
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433 | else { /* no free elements */ |
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434 | ref = luaL_getn(L, t); |
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435 | if (ref < RESERVED_REFS) |
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436 | ref = RESERVED_REFS; /* skip reserved references */ |
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437 | ref++; /* create new reference */ |
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438 | luaL_setn(L, t, ref); |
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439 | } |
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440 | lua_rawseti(L, t, ref); |
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441 | return ref; |
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442 | } |
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443 | |
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444 | |
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445 | LUALIB_API void luaL_unref (lua_State *L, int t, int ref) { |
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446 | if (ref >= 0) { |
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447 | t = abs_index(L, t); |
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448 | lua_rawgeti(L, t, FREELIST_REF); |
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449 | lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */ |
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450 | lua_pushnumber(L, (lua_Number)ref); |
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451 | lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */ |
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452 | } |
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453 | } |
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454 | |
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455 | |
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456 | |
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457 | /* |
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458 | ** {====================================================== |
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459 | ** Load functions |
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460 | ** ======================================================= |
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461 | */ |
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462 | |
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463 | typedef struct LoadF { |
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464 | FILE *f; |
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465 | char buff[LUAL_BUFFERSIZE]; |
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466 | } LoadF; |
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467 | |
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468 | |
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469 | static const char *getF (lua_State *L, void *ud, size_t *size) { |
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470 | LoadF *lf = (LoadF *)ud; |
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471 | (void)L; |
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472 | if (feof(lf->f)) return NULL; |
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473 | *size = fread(lf->buff, 1, LUAL_BUFFERSIZE, lf->f); |
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474 | return (*size > 0) ? lf->buff : NULL; |
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475 | } |
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476 | |
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477 | |
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478 | static int errfile (lua_State *L, int fnameindex) { |
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479 | const char *filename = lua_tostring(L, fnameindex) + 1; |
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480 | lua_pushfstring(L, "cannot read %s: %s", filename, strerror(errno)); |
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481 | lua_remove(L, fnameindex); |
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482 | return LUA_ERRFILE; |
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483 | } |
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484 | |
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485 | |
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486 | LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) { |
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487 | LoadF lf; |
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488 | int status, readstatus; |
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489 | int c; |
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490 | int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */ |
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491 | if (filename == NULL) { |
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492 | lua_pushliteral(L, "=stdin"); |
---|
493 | lf.f = stdin; |
---|
494 | } |
---|
495 | else { |
---|
496 | lua_pushfstring(L, "@%s", filename); |
---|
497 | lf.f = fopen(filename, "r"); |
---|
498 | } |
---|
499 | if (lf.f == NULL) return errfile(L, fnameindex); /* unable to open file */ |
---|
500 | c = ungetc(getc(lf.f), lf.f); |
---|
501 | if (!(isspace(c) || isprint(c)) && lf.f != stdin) { /* binary file? */ |
---|
502 | fclose(lf.f); |
---|
503 | lf.f = fopen(filename, "rb"); /* reopen in binary mode */ |
---|
504 | if (lf.f == NULL) return errfile(L, fnameindex); /* unable to reopen file */ |
---|
505 | } |
---|
506 | status = lua_load(L, getF, &lf, lua_tostring(L, -1)); |
---|
507 | readstatus = ferror(lf.f); |
---|
508 | if (lf.f != stdin) fclose(lf.f); /* close file (even in case of errors) */ |
---|
509 | if (readstatus) { |
---|
510 | lua_settop(L, fnameindex); /* ignore results from `lua_load' */ |
---|
511 | return errfile(L, fnameindex); |
---|
512 | } |
---|
513 | lua_remove(L, fnameindex); |
---|
514 | return status; |
---|
515 | } |
---|
516 | |
---|
517 | |
---|
518 | typedef struct LoadS { |
---|
519 | const char *s; |
---|
520 | size_t size; |
---|
521 | } LoadS; |
---|
522 | |
---|
523 | |
---|
524 | static const char *getS (lua_State *L, void *ud, size_t *size) { |
---|
525 | LoadS *ls = (LoadS *)ud; |
---|
526 | (void)L; |
---|
527 | if (ls->size == 0) return NULL; |
---|
528 | *size = ls->size; |
---|
529 | ls->size = 0; |
---|
530 | return ls->s; |
---|
531 | } |
---|
532 | |
---|
533 | |
---|
534 | LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size, |
---|
535 | const char *name) { |
---|
536 | LoadS ls; |
---|
537 | ls.s = buff; |
---|
538 | ls.size = size; |
---|
539 | return lua_load(L, getS, &ls, name); |
---|
540 | } |
---|
541 | |
---|
542 | /* }====================================================== */ |
---|
543 | |
---|
544 | |
---|
545 | /* |
---|
546 | ** {====================================================== |
---|
547 | ** compatibility code |
---|
548 | ** ======================================================= |
---|
549 | */ |
---|
550 | |
---|
551 | |
---|
552 | static void callalert (lua_State *L, int status) { |
---|
553 | if (status != 0) { |
---|
554 | lua_getglobal(L, "_ALERT"); |
---|
555 | if (lua_isfunction(L, -1)) { |
---|
556 | lua_insert(L, -2); |
---|
557 | lua_call(L, 1, 0); |
---|
558 | } |
---|
559 | else { /* no _ALERT function; print it on stderr */ |
---|
560 | fprintf(stderr, "%s\n", lua_tostring(L, -2)); |
---|
561 | lua_pop(L, 2); /* remove error message and _ALERT */ |
---|
562 | } |
---|
563 | } |
---|
564 | } |
---|
565 | |
---|
566 | |
---|
567 | static int aux_do (lua_State *L, int status) { |
---|
568 | if (status == 0) { /* parse OK? */ |
---|
569 | status = lua_pcall(L, 0, LUA_MULTRET, 0); /* call main */ |
---|
570 | } |
---|
571 | callalert(L, status); |
---|
572 | return status; |
---|
573 | } |
---|
574 | |
---|
575 | |
---|
576 | LUALIB_API int lua_dofile (lua_State *L, const char *filename) { |
---|
577 | return aux_do(L, luaL_loadfile(L, filename)); |
---|
578 | } |
---|
579 | |
---|
580 | |
---|
581 | LUALIB_API int lua_dobuffer (lua_State *L, const char *buff, size_t size, |
---|
582 | const char *name) { |
---|
583 | return aux_do(L, luaL_loadbuffer(L, buff, size, name)); |
---|
584 | } |
---|
585 | |
---|
586 | |
---|
587 | LUALIB_API int lua_dostring (lua_State *L, const char *str) { |
---|
588 | return lua_dobuffer(L, str, strlen(str), str); |
---|
589 | } |
---|
590 | |
---|
591 | /* }====================================================== */ |
---|