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1 /*
2 ** $Id: lauxlib.h $
3 ** Auxiliary functions for building Lua libraries
4 ** See Copyright Notice in lua.h
5 */
6
7
8 #ifndef lauxlib_h
9 #define lauxlib_h
10
11
12 #include <stddef.h>
13 #include <stdio.h>
14
15 #include "luaconf.h"
16 #include "lua.h"
17
18
19 /* global table */
20 #define LUA_GNAME "_G"
21
22
23 typedef struct luaL_Buffer luaL_Buffer;
24
25
26 /* extra error code for 'luaL_loadfilex' */
27 #define LUA_ERRFILE (LUA_ERRERR+1)
28
29
30 /* key, in the registry, for table of loaded modules */
31 #define LUA_LOADED_TABLE "_LOADED"
32
33
34 /* key, in the registry, for table of preloaded loaders */
35 #define LUA_PRELOAD_TABLE "_PRELOAD"
36
37
38 typedef struct luaL_Reg {
39 const char *name;
40 lua_CFunction func;
41 } luaL_Reg;
42
43
44 #define LUAL_NUMSIZES (sizeof(lua_Integer)*16 + sizeof(lua_Number))
45
46 LUALIB_API void (luaL_checkversion_) (lua_State *L, lua_Number ver, size_t sz);
47 #define luaL_checkversion(L) \
48 luaL_checkversion_(L, LUA_VERSION_NUM, LUAL_NUMSIZES)
49
50 LUALIB_API int (luaL_getmetafield) (lua_State *L, int obj, const char *e);
51 LUALIB_API int (luaL_callmeta) (lua_State *L, int obj, const char *e);
52 LUALIB_API const char *(luaL_tolstring) (lua_State *L, int idx, size_t *len);
53 LUALIB_API int (luaL_argerror) (lua_State *L, int arg, const char *extramsg);
54 LUALIB_API int (luaL_typeerror) (lua_State *L, int arg, const char *tname);
55 LUALIB_API const char *(luaL_checklstring) (lua_State *L, int arg,
56 size_t *l);
57 LUALIB_API const char *(luaL_optlstring) (lua_State *L, int arg,
58 const char *def, size_t *l);
59 LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int arg);
60 LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int arg, lua_Number def);
61
62 LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int arg);
63 LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int arg,
64 lua_Integer def);
65
66 LUALIB_API void (luaL_checkstack) (lua_State *L, int sz, const char *msg);
67 LUALIB_API void (luaL_checktype) (lua_State *L, int arg, int t);
68 LUALIB_API void (luaL_checkany) (lua_State *L, int arg);
69
70 LUALIB_API int (luaL_newmetatable) (lua_State *L, const char *tname);
71 LUALIB_API void (luaL_setmetatable) (lua_State *L, const char *tname);
72 LUALIB_API void *(luaL_testudata) (lua_State *L, int ud, const char *tname);
73 LUALIB_API void *(luaL_checkudata) (lua_State *L, int ud, const char *tname);
74
75 LUALIB_API void (luaL_where) (lua_State *L, int lvl);
76 LUALIB_API int (luaL_error) (lua_State *L, const char *fmt, ...);
77
78 LUALIB_API int (luaL_checkoption) (lua_State *L, int arg, const char *def,
79 const char *const lst[]);
80
81 LUALIB_API int (luaL_fileresult) (lua_State *L, int stat, const char *fname);
82 LUALIB_API int (luaL_execresult) (lua_State *L, int stat);
83
84
85 /* predefined references */
86 #define LUA_NOREF (-2)
87 #define LUA_REFNIL (-1)
88
89 LUALIB_API int (luaL_ref) (lua_State *L, int t);
90 LUALIB_API void (luaL_unref) (lua_State *L, int t, int ref);
91
92 LUALIB_API int (luaL_loadfilex) (lua_State *L, const char *filename,
93 const char *mode);
94
95 #define luaL_loadfile(L,f) luaL_loadfilex(L,f,NULL)
96
97 LUALIB_API int (luaL_loadbufferx) (lua_State *L, const char *buff, size_t sz,
98 const char *name, const char *mode);
99 LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s);
100
101 LUALIB_API lua_State *(luaL_newstate) (void);
102
103 LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx);
104
105 LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s,
106 const char *p, const char *r);
107 LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s,
108 const char *p, const char *r);
109
110 LUALIB_API void (luaL_setfuncs) (lua_State *L, const luaL_Reg *l, int nup);
111
112 LUALIB_API int (luaL_getsubtable) (lua_State *L, int idx, const char *fname);
113
114 LUALIB_API void (luaL_traceback) (lua_State *L, lua_State *L1,
115 const char *msg, int level);
116
117 LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
118 lua_CFunction openf, int glb);
119
120 /*
121 ** ===============================================================
122 ** some useful macros
123 ** ===============================================================
124 */
125
126
127 #define luaL_newlibtable(L,l) \
128 lua_createtable(L, 0, sizeof(l)/sizeof((l)[0]) - 1)
129
130 #define luaL_newlib(L,l) \
131 (luaL_checkversion(L), luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))
132
133 #define luaL_argcheck(L, cond,arg,extramsg) \
134 ((void)(luai_likely(cond) || luaL_argerror(L, (arg), (extramsg))))
135
136 #define luaL_argexpected(L,cond,arg,tname) \
137 ((void)(luai_likely(cond) || luaL_typeerror(L, (arg), (tname))))
138
139 #define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
140 #define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL))
141
142 #define luaL_typename(L,i) lua_typename(L, lua_type(L,(i)))
143
144 #define luaL_dofile(L, fn) \
145 (luaL_loadfile(L, fn) || lua_pcall(L, 0, LUA_MULTRET, 0))
146
147 #define luaL_dostring(L, s) \
148 (luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))
149
150 #define luaL_getmetatable(L,n) (lua_getfield(L, LUA_REGISTRYINDEX, (n)))
151
152 #define luaL_opt(L,f,n,d) (lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))
153
154 #define luaL_loadbuffer(L,s,sz,n) luaL_loadbufferx(L,s,sz,n,NULL)
155
156
157 /* push the value used to represent failure/error */
158 #define luaL_pushfail(L) lua_pushnil(L)
159
160
161 /*
162 ** Internal assertions for in-house debugging
163 */
164 #if !defined(lua_assert)
165
166 #if defined LUAI_ASSERT
167 #include <assert.h>
168 #define lua_assert(c) assert(c)
169 #else
170 #define lua_assert(c) ((void)0)
171 #endif
172
173 #endif
174
175
176
177 /*
178 ** {======================================================
179 ** Generic Buffer manipulation
180 ** =======================================================
181 */
182
183 struct luaL_Buffer {
184 char *b; /* buffer address */
185 size_t size; /* buffer size */
186 size_t n; /* number of characters in buffer */
187 lua_State *L;
188 union {
189 LUAI_MAXALIGN; /* ensure maximum alignment for buffer */
190 char b[LUAL_BUFFERSIZE]; /* initial buffer */
191 } init;
192 };
193
194
195 #define luaL_bufflen(bf) ((bf)->n)
196 #define luaL_buffaddr(bf) ((bf)->b)
197
198
199 #define luaL_addchar(B,c) \
200 ((void)((B)->n < (B)->size || luaL_prepbuffsize((B), 1)), \
201 ((B)->b[(B)->n++] = (c)))
202
203 #define luaL_addsize(B,s) ((B)->n += (s))
204
205 #define luaL_buffsub(B,s) ((B)->n -= (s))
206
207 LUALIB_API void (luaL_buffinit) (lua_State *L, luaL_Buffer *B);
208 LUALIB_API char *(luaL_prepbuffsize) (luaL_Buffer *B, size_t sz);
209 LUALIB_API void (luaL_addlstring) (luaL_Buffer *B, const char *s, size_t l);
210 LUALIB_API void (luaL_addstring) (luaL_Buffer *B, const char *s);
211 LUALIB_API void (luaL_addvalue) (luaL_Buffer *B);
212 LUALIB_API void (luaL_pushresult) (luaL_Buffer *B);
213 LUALIB_API void (luaL_pushresultsize) (luaL_Buffer *B, size_t sz);
214 LUALIB_API char *(luaL_buffinitsize) (lua_State *L, luaL_Buffer *B, size_t sz);
215
216 #define luaL_prepbuffer(B) luaL_prepbuffsize(B, LUAL_BUFFERSIZE)
217
218 /* }====================================================== */
219
220
221
222 /*
223 ** {======================================================
224 ** File handles for IO library
225 ** =======================================================
226 */
227
228 /*
229 ** A file handle is a userdata with metatable 'LUA_FILEHANDLE' and
230 ** initial structure 'luaL_Stream' (it may contain other fields
231 ** after that initial structure).
232 */
233
234 #define LUA_FILEHANDLE "FILE*"
235
236
237 typedef struct luaL_Stream {
238 FILE *f; /* stream (NULL for incompletely created streams) */
239 lua_CFunction closef; /* to close stream (NULL for closed streams) */
240 } luaL_Stream;
241
242 /* }====================================================== */
243
244 /*
245 ** {==================================================================
246 ** "Abstraction Layer" for basic report of messages and errors
247 ** ===================================================================
248 */
249
250 /* print a string */
251 #if !defined(lua_writestring)
252 #define lua_writestring(s,l) fwrite((s), sizeof(char), (l), stdout)
253 #endif
254
255 /* print a newline and flush the output */
256 #if !defined(lua_writeline)
257 #define lua_writeline() (lua_writestring("\n", 1), fflush(stdout))
258 #endif
259
260 /* print an error message */
261 #if !defined(lua_writestringerror)
262 #define lua_writestringerror(s,p) \
263 (fprintf(stderr, (s), (p)), fflush(stderr))
264 #endif
265
266 /* }================================================================== */
267
268
269 /*
270 ** {============================================================
271 ** Compatibility with deprecated conversions
272 ** =============================================================
273 */
274 #if defined(LUA_COMPAT_APIINTCASTS)
275
276 #define luaL_checkunsigned(L,a) ((lua_Unsigned)luaL_checkinteger(L,a))
277 #define luaL_optunsigned(L,a,d) \
278 ((lua_Unsigned)luaL_optinteger(L,a,(lua_Integer)(d)))
279
280 #define luaL_checkint(L,n) ((int)luaL_checkinteger(L, (n)))
281 #define luaL_optint(L,n,d) ((int)luaL_optinteger(L, (n), (d)))
282
283 #define luaL_checklong(L,n) ((long)luaL_checkinteger(L, (n)))
284 #define luaL_optlong(L,n,d) ((long)luaL_optinteger(L, (n), (d)))
285
286 #endif
287 /* }============================================================ */
288
289
290
291 #endif
292
293