[1803] | 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"); |
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| 493 | lf.f = stdin; |
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| 494 | } |
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| 495 | else { |
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| 496 | lua_pushfstring(L, "@%s", filename); |
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| 497 | lf.f = fopen(filename, "r"); |
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| 498 | } |
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| 499 | if (lf.f == NULL) return errfile(L, fnameindex); /* unable to open file */ |
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| 500 | c = ungetc(getc(lf.f), lf.f); |
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| 501 | if (!(isspace(c) || isprint(c)) && lf.f != stdin) { /* binary file? */ |
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| 502 | fclose(lf.f); |
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| 503 | lf.f = fopen(filename, "rb"); /* reopen in binary mode */ |
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| 504 | if (lf.f == NULL) return errfile(L, fnameindex); /* unable to reopen file */ |
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| 505 | } |
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| 506 | status = lua_load(L, getF, &lf, lua_tostring(L, -1)); |
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| 507 | readstatus = ferror(lf.f); |
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| 508 | if (lf.f != stdin) fclose(lf.f); /* close file (even in case of errors) */ |
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| 509 | if (readstatus) { |
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| 510 | lua_settop(L, fnameindex); /* ignore results from `lua_load' */ |
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| 511 | return errfile(L, fnameindex); |
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| 512 | } |
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| 513 | lua_remove(L, fnameindex); |
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| 514 | return status; |
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| 515 | } |
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| 516 | |
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| 517 | |
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| 518 | typedef struct LoadS { |
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| 519 | const char *s; |
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| 520 | size_t size; |
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| 521 | } LoadS; |
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| 522 | |
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| 523 | |
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| 524 | static const char *getS (lua_State *L, void *ud, size_t *size) { |
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| 525 | LoadS *ls = (LoadS *)ud; |
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| 526 | (void)L; |
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| 527 | if (ls->size == 0) return NULL; |
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| 528 | *size = ls->size; |
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| 529 | ls->size = 0; |
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| 530 | return ls->s; |
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| 531 | } |
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| 532 | |
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| 533 | |
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| 534 | LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size, |
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| 535 | const char *name) { |
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| 536 | LoadS ls; |
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| 537 | ls.s = buff; |
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| 538 | ls.size = size; |
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| 539 | return lua_load(L, getS, &ls, name); |
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| 540 | } |
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| 541 | |
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| 542 | /* }====================================================== */ |
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| 543 | |
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| 544 | |
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| 545 | /* |
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| 546 | ** {====================================================== |
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| 547 | ** compatibility code |
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| 548 | ** ======================================================= |
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| 549 | */ |
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| 550 | |
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| 551 | |
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| 552 | static void callalert (lua_State *L, int status) { |
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| 553 | if (status != 0) { |
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| 554 | lua_getglobal(L, "_ALERT"); |
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| 555 | if (lua_isfunction(L, -1)) { |
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| 556 | lua_insert(L, -2); |
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| 557 | lua_call(L, 1, 0); |
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| 558 | } |
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| 559 | else { /* no _ALERT function; print it on stderr */ |
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| 560 | fprintf(stderr, "%s\n", lua_tostring(L, -2)); |
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| 561 | lua_pop(L, 2); /* remove error message and _ALERT */ |
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| 562 | } |
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| 563 | } |
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| 564 | } |
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| 565 | |
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| 566 | |
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| 567 | static int aux_do (lua_State *L, int status) { |
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| 568 | if (status == 0) { /* parse OK? */ |
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| 569 | status = lua_pcall(L, 0, LUA_MULTRET, 0); /* call main */ |
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| 570 | } |
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| 571 | callalert(L, status); |
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| 572 | return status; |
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| 573 | } |
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| 574 | |
---|
| 575 | |
---|
| 576 | LUALIB_API int lua_dofile (lua_State *L, const char *filename) { |
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| 577 | return aux_do(L, luaL_loadfile(L, filename)); |
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| 578 | } |
---|
| 579 | |
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| 580 | |
---|
| 581 | LUALIB_API int lua_dobuffer (lua_State *L, const char *buff, size_t size, |
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| 582 | const char *name) { |
---|
| 583 | return aux_do(L, luaL_loadbuffer(L, buff, size, name)); |
---|
| 584 | } |
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| 585 | |
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| 586 | |
---|
| 587 | LUALIB_API int lua_dostring (lua_State *L, const char *str) { |
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| 588 | return lua_dobuffer(L, str, strlen(str), str); |
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| 589 | } |
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| 590 | |
---|
| 591 | /* }====================================================== */ |
---|