1 /*
2 ** $Id: lbaselib.c,v 1.276.1.1 2013/04/12 18:48:47 roberto Exp $
3 ** Basic library
4 ** See Copyright Notice in lua.h
5 */
6
7 /* The following built-in lua functions have been removed and are not available
8 * for use in ZFS channel programs:
9 *
10 * dofile
11 * loadfile
12 * load
13 * pcall
14 * print
15 * xpcall
16 */
17
18 #include <sys/zfs_context.h>
19 #include <sys/ctype.h>
20 #define toupper(C) (((C) >= 'a' && (C) <= 'z')? (C) - 'a' + 'A': (C))
21
22 #define lbaselib_c
23 #define LUA_LIB
24
25 #include "lua.h"
26
27 #include "lauxlib.h"
28 #include "lualib.h"
29
30 #define SPACECHARS " \f\n\r\t\v"
31
luaB_tonumber(lua_State * L)32 static int luaB_tonumber (lua_State *L) {
33 if (lua_isnoneornil(L, 2)) { /* standard conversion */
34 int isnum;
35 lua_Number n = lua_tonumberx(L, 1, &isnum);
36 if (isnum) {
37 lua_pushnumber(L, n);
38 return 1;
39 } /* else not a number; must be something */
40 luaL_checkany(L, 1);
41 }
42 else {
43 size_t l;
44 const char *s = luaL_checklstring(L, 1, &l);
45 const char *e = s + l; /* end point for 's' */
46 int base = luaL_checkint(L, 2);
47 int neg = 0;
48 luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
49 s += strspn(s, SPACECHARS); /* skip initial spaces */
50 if (*s == '-') { s++; neg = 1; } /* handle signal */
51 else if (*s == '+') s++;
52 if (isalnum((unsigned char)*s)) {
53 lua_Number n = 0;
54 do {
55 int digit = (isdigit((unsigned char)*s)) ? *s - '0'
56 : toupper((unsigned char)*s) - 'A' + 10;
57 if (digit >= base) break; /* invalid numeral; force a fail */
58 n = n * (lua_Number)base + (lua_Number)digit;
59 s++;
60 } while (isalnum((unsigned char)*s));
61 s += strspn(s, SPACECHARS); /* skip trailing spaces */
62 if (s == e) { /* no invalid trailing characters? */
63 lua_pushnumber(L, (neg) ? -n : n);
64 return 1;
65 } /* else not a number */
66 } /* else not a number */
67 }
68 lua_pushnil(L); /* not a number */
69 return 1;
70 }
71
72
luaB_error(lua_State * L)73 static int luaB_error (lua_State *L) {
74 int level = luaL_optint(L, 2, 1);
75 lua_settop(L, 1);
76 if (lua_isstring(L, 1) && level > 0) { /* add extra information? */
77 luaL_where(L, level);
78 lua_pushvalue(L, 1);
79 lua_concat(L, 2);
80 }
81 return lua_error(L);
82 }
83
84
luaB_getmetatable(lua_State * L)85 static int luaB_getmetatable (lua_State *L) {
86 luaL_checkany(L, 1);
87 if (!lua_getmetatable(L, 1)) {
88 lua_pushnil(L);
89 return 1; /* no metatable */
90 }
91 luaL_getmetafield(L, 1, "__metatable");
92 return 1; /* returns either __metatable field (if present) or metatable */
93 }
94
95
luaB_setmetatable(lua_State * L)96 static int luaB_setmetatable (lua_State *L) {
97 int t = lua_type(L, 2);
98 luaL_checktype(L, 1, LUA_TTABLE);
99 luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
100 "nil or table expected");
101 if (luaL_getmetafield(L, 1, "__metatable"))
102 return luaL_error(L, "cannot change a protected metatable");
103 lua_settop(L, 2);
104 lua_setmetatable(L, 1);
105 return 1;
106 }
107
108
luaB_rawequal(lua_State * L)109 static int luaB_rawequal (lua_State *L) {
110 luaL_checkany(L, 1);
111 luaL_checkany(L, 2);
112 lua_pushboolean(L, lua_rawequal(L, 1, 2));
113 return 1;
114 }
115
116
luaB_rawlen(lua_State * L)117 static int luaB_rawlen (lua_State *L) {
118 int t = lua_type(L, 1);
119 luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
120 "table or string expected");
121 lua_pushinteger(L, lua_rawlen(L, 1));
122 return 1;
123 }
124
125
luaB_rawget(lua_State * L)126 static int luaB_rawget (lua_State *L) {
127 luaL_checktype(L, 1, LUA_TTABLE);
128 luaL_checkany(L, 2);
129 lua_settop(L, 2);
130 lua_rawget(L, 1);
131 return 1;
132 }
133
luaB_rawset(lua_State * L)134 static int luaB_rawset (lua_State *L) {
135 luaL_checktype(L, 1, LUA_TTABLE);
136 luaL_checkany(L, 2);
137 luaL_checkany(L, 3);
138 lua_settop(L, 3);
139 lua_rawset(L, 1);
140 return 1;
141 }
142
143
luaB_collectgarbage(lua_State * L)144 static int luaB_collectgarbage (lua_State *L) {
145 static const char *const opts[] = {"stop", "restart", "collect",
146 "count", "step", "setpause", "setstepmul",
147 "setmajorinc", "isrunning", "generational", "incremental", NULL};
148 static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
149 LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
150 LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
151 int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
152 int ex = luaL_optint(L, 2, 0);
153 int res = lua_gc(L, o, ex);
154 switch (o) {
155 case LUA_GCCOUNT: {
156 int b = lua_gc(L, LUA_GCCOUNTB, 0);
157 lua_pushnumber(L, res + ((lua_Number)b/1024));
158 lua_pushinteger(L, b);
159 return 2;
160 }
161 case LUA_GCSTEP: case LUA_GCISRUNNING: {
162 lua_pushboolean(L, res);
163 return 1;
164 }
165 default: {
166 lua_pushinteger(L, res);
167 return 1;
168 }
169 }
170 }
171
172
luaB_type(lua_State * L)173 static int luaB_type (lua_State *L) {
174 luaL_checkany(L, 1);
175 lua_pushstring(L, luaL_typename(L, 1));
176 return 1;
177 }
178
179
pairsmeta(lua_State * L,const char * method,int iszero,lua_CFunction iter)180 static int pairsmeta (lua_State *L, const char *method, int iszero,
181 lua_CFunction iter) {
182 if (!luaL_getmetafield(L, 1, method)) { /* no metamethod? */
183 luaL_checktype(L, 1, LUA_TTABLE); /* argument must be a table */
184 lua_pushcfunction(L, iter); /* will return generator, */
185 lua_pushvalue(L, 1); /* state, */
186 if (iszero) lua_pushinteger(L, 0); /* and initial value */
187 else lua_pushnil(L);
188 }
189 else {
190 lua_pushvalue(L, 1); /* argument 'self' to metamethod */
191 lua_call(L, 1, 3); /* get 3 values from metamethod */
192 }
193 return 3;
194 }
195
196
luaB_next(lua_State * L)197 static int luaB_next (lua_State *L) {
198 luaL_checktype(L, 1, LUA_TTABLE);
199 lua_settop(L, 2); /* create a 2nd argument if there isn't one */
200 if (lua_next(L, 1))
201 return 2;
202 else {
203 lua_pushnil(L);
204 return 1;
205 }
206 }
207
208
luaB_pairs(lua_State * L)209 static int luaB_pairs (lua_State *L) {
210 return pairsmeta(L, "__pairs", 0, luaB_next);
211 }
212
213
ipairsaux(lua_State * L)214 static int ipairsaux (lua_State *L) {
215 int i = luaL_checkint(L, 2);
216 luaL_checktype(L, 1, LUA_TTABLE);
217 i++; /* next value */
218 lua_pushinteger(L, i);
219 lua_rawgeti(L, 1, i);
220 return (lua_isnil(L, -1)) ? 1 : 2;
221 }
222
223
luaB_ipairs(lua_State * L)224 static int luaB_ipairs (lua_State *L) {
225 return pairsmeta(L, "__ipairs", 1, ipairsaux);
226 }
227
228
luaB_assert(lua_State * L)229 static int luaB_assert (lua_State *L) {
230 if (!lua_toboolean(L, 1))
231 return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
232 return lua_gettop(L);
233 }
234
235
luaB_select(lua_State * L)236 static int luaB_select (lua_State *L) {
237 int n = lua_gettop(L);
238 if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
239 lua_pushinteger(L, n-1);
240 return 1;
241 }
242 else {
243 int i = luaL_checkint(L, 1);
244 if (i < 0) i = n + i;
245 else if (i > n) i = n;
246 luaL_argcheck(L, 1 <= i, 1, "index out of range");
247 return n - i;
248 }
249 }
250
luaB_tostring(lua_State * L)251 static int luaB_tostring (lua_State *L) {
252 luaL_checkany(L, 1);
253 luaL_tolstring(L, 1, NULL);
254 return 1;
255 }
256
257 static const luaL_Reg base_funcs[] = {
258 {"assert", luaB_assert},
259 {"collectgarbage", luaB_collectgarbage},
260 {"error", luaB_error},
261 {"getmetatable", luaB_getmetatable},
262 {"ipairs", luaB_ipairs},
263 #if defined(LUA_COMPAT_LOADSTRING)
264 {"loadstring", luaB_load},
265 #endif
266 {"next", luaB_next},
267 {"pairs", luaB_pairs},
268 {"rawequal", luaB_rawequal},
269 {"rawlen", luaB_rawlen},
270 {"rawget", luaB_rawget},
271 {"rawset", luaB_rawset},
272 {"select", luaB_select},
273 {"setmetatable", luaB_setmetatable},
274 {"tonumber", luaB_tonumber},
275 {"tostring", luaB_tostring},
276 {"type", luaB_type},
277 {NULL, NULL}
278 };
279
280
luaopen_base(lua_State * L)281 LUAMOD_API int luaopen_base (lua_State *L) {
282 /* set global _G */
283 lua_pushglobaltable(L);
284 lua_pushglobaltable(L);
285 lua_setfield(L, -2, "_G");
286 /* open lib into global table */
287 luaL_setfuncs(L, base_funcs, 0);
288 lua_pushliteral(L, LUA_VERSION);
289 lua_setfield(L, -2, "_VERSION"); /* set global _VERSION */
290 return 1;
291 }
292
293