[proxmark3-svn] / liblua / ldblib.c

/*
** $Id: ldblib.c,v 1.132 2012/01/19 20:14:44 roberto Exp $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define ldblib_c
#define LUA_LIB

#include "lua.h"

#include "lauxlib.h"
#include "lualib.h"


#define HOOKKEY		"_HKEY"


static int db_getregistry (lua_State *L) {
  lua_pushvalue(L, LUA_REGISTRYINDEX);
  return 1;
}


static int db_getmetatable (lua_State *L) {
  luaL_checkany(L, 1);
  if (!lua_getmetatable(L, 1)) {
    lua_pushnil(L);  /* no metatable */
  }
  return 1;
}


static int db_setmetatable (lua_State *L) {
  int t = lua_type(L, 2);
  luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
                    "nil or table expected");
  lua_settop(L, 2);
  lua_setmetatable(L, 1);
  return 1;  /* return 1st argument */
}


static int db_getuservalue (lua_State *L) {
  if (lua_type(L, 1) != LUA_TUSERDATA)
    lua_pushnil(L);
  else
    lua_getuservalue(L, 1);
  return 1;
}


static int db_setuservalue (lua_State *L) {
  if (lua_type(L, 1) == LUA_TLIGHTUSERDATA)
    luaL_argerror(L, 1, "full userdata expected, got light userdata");
  luaL_checktype(L, 1, LUA_TUSERDATA);
  if (!lua_isnoneornil(L, 2))
    luaL_checktype(L, 2, LUA_TTABLE);
  lua_settop(L, 2);
  lua_setuservalue(L, 1);
  return 1;
}


static void settabss (lua_State *L, const char *i, const char *v) {
  lua_pushstring(L, v);
  lua_setfield(L, -2, i);
}


static void settabsi (lua_State *L, const char *i, int v) {
  lua_pushinteger(L, v);
  lua_setfield(L, -2, i);
}


static void settabsb (lua_State *L, const char *i, int v) {
  lua_pushboolean(L, v);
  lua_setfield(L, -2, i);
}


static lua_State *getthread (lua_State *L, int *arg) {
  if (lua_isthread(L, 1)) {
    *arg = 1;
    return lua_tothread(L, 1);
  }
  else {
    *arg = 0;
    return L;
  }
}


static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {
  if (L == L1) {
    lua_pushvalue(L, -2);
    lua_remove(L, -3);
  }
  else
    lua_xmove(L1, L, 1);
  lua_setfield(L, -2, fname);
}


static int db_getinfo (lua_State *L) {
  lua_Debug ar;
  int arg;
  lua_State *L1 = getthread(L, &arg);
  const char *options = luaL_optstring(L, arg+2, "flnStu");
  if (lua_isnumber(L, arg+1)) {
    if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {
      lua_pushnil(L);  /* level out of range */
      return 1;
    }
  }
  else if (lua_isfunction(L, arg+1)) {
    lua_pushfstring(L, ">%s", options);
    options = lua_tostring(L, -1);
    lua_pushvalue(L, arg+1);
    lua_xmove(L, L1, 1);
  }
  else
    return luaL_argerror(L, arg+1, "function or level expected");
  if (!lua_getinfo(L1, options, &ar))
    return luaL_argerror(L, arg+2, "invalid option");
  lua_createtable(L, 0, 2);
  if (strchr(options, 'S')) {
    settabss(L, "source", ar.source);
    settabss(L, "short_src", ar.short_src);
    settabsi(L, "linedefined", ar.linedefined);
    settabsi(L, "lastlinedefined", ar.lastlinedefined);
    settabss(L, "what", ar.what);
  }
  if (strchr(options, 'l'))
    settabsi(L, "currentline", ar.currentline);
  if (strchr(options, 'u')) {
    settabsi(L, "nups", ar.nups);
    settabsi(L, "nparams", ar.nparams);
    settabsb(L, "isvararg", ar.isvararg);
  }
  if (strchr(options, 'n')) {
    settabss(L, "name", ar.name);
    settabss(L, "namewhat", ar.namewhat);
  }
  if (strchr(options, 't'))
    settabsb(L, "istailcall", ar.istailcall);
  if (strchr(options, 'L'))
    treatstackoption(L, L1, "activelines");
  if (strchr(options, 'f'))
    treatstackoption(L, L1, "func");
  return 1;  /* return table */
}


static int db_getlocal (lua_State *L) {
  int arg;
  lua_State *L1 = getthread(L, &arg);
  lua_Debug ar;
  const char *name;
  int nvar = luaL_checkint(L, arg+2);  /* local-variable index */
  if (lua_isfunction(L, arg + 1)) {  /* function argument? */
    lua_pushvalue(L, arg + 1);  /* push function */
    lua_pushstring(L, lua_getlocal(L, NULL, nvar));  /* push local name */
    return 1;
  }
  else {  /* stack-level argument */
    if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar))  /* out of range? */
      return luaL_argerror(L, arg+1, "level out of range");
    name = lua_getlocal(L1, &ar, nvar);
    if (name) {
      lua_xmove(L1, L, 1);  /* push local value */
      lua_pushstring(L, name);  /* push name */
      lua_pushvalue(L, -2);  /* re-order */
      return 2;
    }
    else {
      lua_pushnil(L);  /* no name (nor value) */
      return 1;
    }
  }
}


static int db_setlocal (lua_State *L) {
  int arg;
  lua_State *L1 = getthread(L, &arg);
  lua_Debug ar;
  if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar))  /* out of range? */
    return luaL_argerror(L, arg+1, "level out of range");
  luaL_checkany(L, arg+3);
  lua_settop(L, arg+3);
  lua_xmove(L, L1, 1);
  lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));
  return 1;
}


static int auxupvalue (lua_State *L, int get) {
  const char *name;
  int n = luaL_checkint(L, 2);
  luaL_checktype(L, 1, LUA_TFUNCTION);
  name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
  if (name == NULL) return 0;
  lua_pushstring(L, name);
  lua_insert(L, -(get+1));
  return get + 1;
}


static int db_getupvalue (lua_State *L) {
  return auxupvalue(L, 1);
}


static int db_setupvalue (lua_State *L) {
  luaL_checkany(L, 3);
  return auxupvalue(L, 0);
}


static int checkupval (lua_State *L, int argf, int argnup) {
  lua_Debug ar;
  int nup = luaL_checkint(L, argnup);
  luaL_checktype(L, argf, LUA_TFUNCTION);
  lua_pushvalue(L, argf);
  lua_getinfo(L, ">u", &ar);
  luaL_argcheck(L, 1 <= nup && nup <= ar.nups, argnup, "invalid upvalue index");
  return nup;
}


static int db_upvalueid (lua_State *L) {
  int n = checkupval(L, 1, 2);
  lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));
  return 1;
}


static int db_upvaluejoin (lua_State *L) {
  int n1 = checkupval(L, 1, 2);
  int n2 = checkupval(L, 3, 4);
  luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
  luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
  lua_upvaluejoin(L, 1, n1, 3, n2);
  return 0;
}


#define gethooktable(L)	luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)


static void hookf (lua_State *L, lua_Debug *ar) {
  static const char *const hooknames[] =
    {"call", "return", "line", "count", "tail call"};
  gethooktable(L);
  lua_pushthread(L);
  lua_rawget(L, -2);
  if (lua_isfunction(L, -1)) {
    lua_pushstring(L, hooknames[(int)ar->event]);
    if (ar->currentline >= 0)
      lua_pushinteger(L, ar->currentline);
    else lua_pushnil(L);
    lua_assert(lua_getinfo(L, "lS", ar));
    lua_call(L, 2, 0);
  }
}


static int makemask (const char *smask, int count) {
  int mask = 0;
  if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
  if (strchr(smask, 'r')) mask |= LUA_MASKRET;
  if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
  if (count > 0) mask |= LUA_MASKCOUNT;
  return mask;
}


static char *unmakemask (int mask, char *smask) {
  int i = 0;
  if (mask & LUA_MASKCALL) smask[i++] = 'c';
  if (mask & LUA_MASKRET) smask[i++] = 'r';
  if (mask & LUA_MASKLINE) smask[i++] = 'l';
  smask[i] = '\0';
  return smask;
}


static int db_sethook (lua_State *L) {
  int arg, mask, count;
  lua_Hook func;
  lua_State *L1 = getthread(L, &arg);
  if (lua_isnoneornil(L, arg+1)) {
    lua_settop(L, arg+1);
    func = NULL; mask = 0; count = 0;  /* turn off hooks */
  }
  else {
    const char *smask = luaL_checkstring(L, arg+2);
    luaL_checktype(L, arg+1, LUA_TFUNCTION);
    count = luaL_optint(L, arg+3, 0);
    func = hookf; mask = makemask(smask, count);
  }
  if (gethooktable(L) == 0) {  /* creating hook table? */
    lua_pushstring(L, "k");
    lua_setfield(L, -2, "__mode");  /** hooktable.__mode = "k" */
    lua_pushvalue(L, -1);
    lua_setmetatable(L, -2);  /* setmetatable(hooktable) = hooktable */
  }
  lua_pushthread(L1); lua_xmove(L1, L, 1);
  lua_pushvalue(L, arg+1);
  lua_rawset(L, -3);  /* set new hook */
  lua_sethook(L1, func, mask, count);  /* set hooks */
  return 0;
}


static int db_gethook (lua_State *L) {
  int arg;
  lua_State *L1 = getthread(L, &arg);
  char buff[5];
  int mask = lua_gethookmask(L1);
  lua_Hook hook = lua_gethook(L1);
  if (hook != NULL && hook != hookf)  /* external hook? */
    lua_pushliteral(L, "external hook");
  else {
    gethooktable(L);
    lua_pushthread(L1); lua_xmove(L1, L, 1);
    lua_rawget(L, -2);   /* get hook */
    lua_remove(L, -2);  /* remove hook table */
  }
  lua_pushstring(L, unmakemask(mask, buff));
  lua_pushinteger(L, lua_gethookcount(L1));
  return 3;
}


static int db_debug (lua_State *L) {
  for (;;) {
    char buffer[250];
    luai_writestringerror("%s", "lua_debug> ");
    if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
        strcmp(buffer, "cont\n") == 0)
      return 0;
    if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
        lua_pcall(L, 0, 0, 0))
      luai_writestringerror("%s\n", lua_tostring(L, -1));
    lua_settop(L, 0);  /* remove eventual returns */
  }
}


static int db_traceback (lua_State *L) {
  int arg;
  lua_State *L1 = getthread(L, &arg);
  const char *msg = lua_tostring(L, arg + 1);
  if (msg == NULL && !lua_isnoneornil(L, arg + 1))  /* non-string 'msg'? */
    lua_pushvalue(L, arg + 1);  /* return it untouched */
  else {
    int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0);
    luaL_traceback(L, L1, msg, level);
  }
  return 1;
}


static const luaL_Reg dblib[] = {
  {"debug", db_debug},
  {"getuservalue", db_getuservalue},
  {"gethook", db_gethook},
  {"getinfo", db_getinfo},
  {"getlocal", db_getlocal},
  {"getregistry", db_getregistry},
  {"getmetatable", db_getmetatable},
  {"getupvalue", db_getupvalue},
  {"upvaluejoin", db_upvaluejoin},
  {"upvalueid", db_upvalueid},
  {"setuservalue", db_setuservalue},
  {"sethook", db_sethook},
  {"setlocal", db_setlocal},
  {"setmetatable", db_setmetatable},
  {"setupvalue", db_setupvalue},
  {"traceback", db_traceback},
  {NULL, NULL}
};


LUAMOD_API int luaopen_debug (lua_State *L) {
  luaL_newlib(L, dblib);
  return 1;
}
Commit	Line	Data
ba8b5c17	1	/*
	2	** $Id: ldblib.c,v 1.132 2012/01/19 20:14:44 roberto Exp $
	3	** Interface from Lua to its debug API
	4	** See Copyright Notice in lua.h
	5	*/
	6
	7
	8	#include <stdio.h>
	9	#include <stdlib.h>
	10	#include <string.h>
	11
	12	#define ldblib_c
	13	#define LUA_LIB
	14
	15	#include "lua.h"
	16
	17	#include "lauxlib.h"
	18	#include "lualib.h"
	19
	20
	21	#define HOOKKEY "_HKEY"
	22
	23
	24
	25	static int db_getregistry (lua_State *L) {
	26	lua_pushvalue(L, LUA_REGISTRYINDEX);
	27	return 1;
	28	}
	29
	30
	31	static int db_getmetatable (lua_State *L) {
	32	luaL_checkany(L, 1);
	33	if (!lua_getmetatable(L, 1)) {
	34	lua_pushnil(L); /* no metatable */
	35	}
	36	return 1;
	37	}
	38
	39
	40	static int db_setmetatable (lua_State *L) {
	41	int t = lua_type(L, 2);
	42	luaL_argcheck(L, t == LUA_TNIL \|\| t == LUA_TTABLE, 2,
	43	"nil or table expected");
	44	lua_settop(L, 2);
	45	lua_setmetatable(L, 1);
	46	return 1; /* return 1st argument */
	47	}
	48
	49
	50	static int db_getuservalue (lua_State *L) {
	51	if (lua_type(L, 1) != LUA_TUSERDATA)
	52	lua_pushnil(L);
	53	else
	54	lua_getuservalue(L, 1);
	55	return 1;
	56	}
	57
	58
	59	static int db_setuservalue (lua_State *L) {
	60	if (lua_type(L, 1) == LUA_TLIGHTUSERDATA)
	61	luaL_argerror(L, 1, "full userdata expected, got light userdata");
	62	luaL_checktype(L, 1, LUA_TUSERDATA);
	63	if (!lua_isnoneornil(L, 2))
	64	luaL_checktype(L, 2, LUA_TTABLE);
65	lua_settop(L, 2);
66	lua_setuservalue(L, 1);
67	return 1;
68	}
69
70
71	static void settabss (lua_State L, const char i, const char *v) {
72	lua_pushstring(L, v);
73	lua_setfield(L, -2, i);
74	}
75
76
77	static void settabsi (lua_State L, const char i, int v) {
78	lua_pushinteger(L, v);
79	lua_setfield(L, -2, i);
80	}
81
82
83	static void settabsb (lua_State L, const char i, int v) {
84	lua_pushboolean(L, v);
85	lua_setfield(L, -2, i);
86	}
87
88
89	static lua_State getthread (lua_State L, int *arg) {
90	if (lua_isthread(L, 1)) {
91	*arg = 1;
92	return lua_tothread(L, 1);
93	}
94	else {
95	*arg = 0;
96	return L;
97	}
98	}
99
100
101	static void treatstackoption (lua_State L, lua_State L1, const char *fname) {
102	if (L == L1) {
103	lua_pushvalue(L, -2);
104	lua_remove(L, -3);
105	}
106	else
107	lua_xmove(L1, L, 1);
108	lua_setfield(L, -2, fname);
109	}
110
111
112	static int db_getinfo (lua_State *L) {
113	lua_Debug ar;
114	int arg;
115	lua_State *L1 = getthread(L, &arg);
116	const char *options = luaL_optstring(L, arg+2, "flnStu");
117	if (lua_isnumber(L, arg+1)) {
118	if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {
119	lua_pushnil(L); /* level out of range */
120	return 1;
121	}
122	}
123	else if (lua_isfunction(L, arg+1)) {
124	lua_pushfstring(L, ">%s", options);
125	options = lua_tostring(L, -1);
126	lua_pushvalue(L, arg+1);
127	lua_xmove(L, L1, 1);
128	}
129	else
130	return luaL_argerror(L, arg+1, "function or level expected");
131	if (!lua_getinfo(L1, options, &ar))
132	return luaL_argerror(L, arg+2, "invalid option");
133	lua_createtable(L, 0, 2);
134	if (strchr(options, 'S')) {
135	settabss(L, "source", ar.source);
136	settabss(L, "short_src", ar.short_src);
137	settabsi(L, "linedefined", ar.linedefined);
138	settabsi(L, "lastlinedefined", ar.lastlinedefined);
139	settabss(L, "what", ar.what);
140	}
141	if (strchr(options, 'l'))
142	settabsi(L, "currentline", ar.currentline);
143	if (strchr(options, 'u')) {
144	settabsi(L, "nups", ar.nups);
145	settabsi(L, "nparams", ar.nparams);
146	settabsb(L, "isvararg", ar.isvararg);
147	}
148	if (strchr(options, 'n')) {
149	settabss(L, "name", ar.name);
150	settabss(L, "namewhat", ar.namewhat);
151	}
152	if (strchr(options, 't'))
153	settabsb(L, "istailcall", ar.istailcall);
154	if (strchr(options, 'L'))
155	treatstackoption(L, L1, "activelines");
156	if (strchr(options, 'f'))
157	treatstackoption(L, L1, "func");
158	return 1; /* return table */
159	}
160
161
162	static int db_getlocal (lua_State *L) {
163	int arg;
164	lua_State *L1 = getthread(L, &arg);
165	lua_Debug ar;
166	const char *name;
167	int nvar = luaL_checkint(L, arg+2); /* local-variable index */
168	if (lua_isfunction(L, arg + 1)) { /* function argument? */
169	lua_pushvalue(L, arg + 1); /* push function */
170	lua_pushstring(L, lua_getlocal(L, NULL, nvar)); /* push local name */
171	return 1;
172	}
173	else { /* stack-level argument */
174	if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
175	return luaL_argerror(L, arg+1, "level out of range");
176	name = lua_getlocal(L1, &ar, nvar);
177	if (name) {
178	lua_xmove(L1, L, 1); /* push local value */
179	lua_pushstring(L, name); /* push name */
180	lua_pushvalue(L, -2); /* re-order */
181	return 2;
182	}
183	else {
184	lua_pushnil(L); /* no name (nor value) */
185	return 1;
186	}
187	}
188	}
189
190
191	static int db_setlocal (lua_State *L) {
192	int arg;
193	lua_State *L1 = getthread(L, &arg);
194	lua_Debug ar;
195	if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
196	return luaL_argerror(L, arg+1, "level out of range");
197	luaL_checkany(L, arg+3);
198	lua_settop(L, arg+3);
199	lua_xmove(L, L1, 1);
200	lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));
201	return 1;
202	}
203
204
205	static int auxupvalue (lua_State *L, int get) {
206	const char *name;
207	int n = luaL_checkint(L, 2);
208	luaL_checktype(L, 1, LUA_TFUNCTION);
209	name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
210	if (name == NULL) return 0;
211	lua_pushstring(L, name);
212	lua_insert(L, -(get+1));
213	return get + 1;
214	}
215
216
217	static int db_getupvalue (lua_State *L) {
218	return auxupvalue(L, 1);
219	}
220
221
222	static int db_setupvalue (lua_State *L) {
223	luaL_checkany(L, 3);
224	return auxupvalue(L, 0);
225	}
226
227
228	static int checkupval (lua_State *L, int argf, int argnup) {
229	lua_Debug ar;
230	int nup = luaL_checkint(L, argnup);
231	luaL_checktype(L, argf, LUA_TFUNCTION);
232	lua_pushvalue(L, argf);
233	lua_getinfo(L, ">u", &ar);
234	luaL_argcheck(L, 1 <= nup && nup <= ar.nups, argnup, "invalid upvalue index");
235	return nup;
236	}
237
238
239	static int db_upvalueid (lua_State *L) {
240	int n = checkupval(L, 1, 2);
241	lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));
242	return 1;
243	}
244
245
246	static int db_upvaluejoin (lua_State *L) {
247	int n1 = checkupval(L, 1, 2);
248	int n2 = checkupval(L, 3, 4);
249	luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
250	luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
251	lua_upvaluejoin(L, 1, n1, 3, n2);
252	return 0;
253	}
254
255
256	#define gethooktable(L) luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)
257
258
259	static void hookf (lua_State L, lua_Debug ar) {
260	static const char *const hooknames[] =
261	{"call", "return", "line", "count", "tail call"};
262	gethooktable(L);
263	lua_pushthread(L);
264	lua_rawget(L, -2);
265	if (lua_isfunction(L, -1)) {
266	lua_pushstring(L, hooknames[(int)ar->event]);
267	if (ar->currentline >= 0)
268	lua_pushinteger(L, ar->currentline);
269	else lua_pushnil(L);
270	lua_assert(lua_getinfo(L, "lS", ar));
271	lua_call(L, 2, 0);
272	}
273	}
274
275
276	static int makemask (const char *smask, int count) {
277	int mask = 0;
278	if (strchr(smask, 'c')) mask \|= LUA_MASKCALL;
279	if (strchr(smask, 'r')) mask \|= LUA_MASKRET;
280	if (strchr(smask, 'l')) mask \|= LUA_MASKLINE;
281	if (count > 0) mask \|= LUA_MASKCOUNT;
282	return mask;
283	}
284
285
286	static char unmakemask (int mask, char smask) {
287	int i = 0;
288	if (mask & LUA_MASKCALL) smask[i++] = 'c';
289	if (mask & LUA_MASKRET) smask[i++] = 'r';
290	if (mask & LUA_MASKLINE) smask[i++] = 'l';
291	smask[i] = '\0';
292	return smask;
293	}
294
295
296	static int db_sethook (lua_State *L) {
297	int arg, mask, count;
298	lua_Hook func;
299	lua_State *L1 = getthread(L, &arg);
300	if (lua_isnoneornil(L, arg+1)) {
301	lua_settop(L, arg+1);
302	func = NULL; mask = 0; count = 0; /* turn off hooks */
303	}
304	else {
305	const char *smask = luaL_checkstring(L, arg+2);
306	luaL_checktype(L, arg+1, LUA_TFUNCTION);
307	count = luaL_optint(L, arg+3, 0);
308	func = hookf; mask = makemask(smask, count);
309	}
310	if (gethooktable(L) == 0) { /* creating hook table? */
311	lua_pushstring(L, "k");
312	lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */
313	lua_pushvalue(L, -1);
314	lua_setmetatable(L, -2); /* setmetatable(hooktable) = hooktable */
315	}
316	lua_pushthread(L1); lua_xmove(L1, L, 1);
317	lua_pushvalue(L, arg+1);
318	lua_rawset(L, -3); /* set new hook */
319	lua_sethook(L1, func, mask, count); /* set hooks */
320	return 0;
321	}
322
323
324	static int db_gethook (lua_State *L) {
325	int arg;
326	lua_State *L1 = getthread(L, &arg);
327	char buff[5];
328	int mask = lua_gethookmask(L1);
329	lua_Hook hook = lua_gethook(L1);
330	if (hook != NULL && hook != hookf) /* external hook? */
331	lua_pushliteral(L, "external hook");
332	else {
333	gethooktable(L);
334	lua_pushthread(L1); lua_xmove(L1, L, 1);
335	lua_rawget(L, -2); /* get hook */
336	lua_remove(L, -2); /* remove hook table */
337	}
338	lua_pushstring(L, unmakemask(mask, buff));
339	lua_pushinteger(L, lua_gethookcount(L1));
340	return 3;
341	}
342
343
344	static int db_debug (lua_State *L) {
345	for (;;) {
346	char buffer[250];
347	luai_writestringerror("%s", "lua_debug> ");
348	if (fgets(buffer, sizeof(buffer), stdin) == 0 \|\|
349	strcmp(buffer, "cont\n") == 0)
350	return 0;
351	if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") \|\|
352	lua_pcall(L, 0, 0, 0))
353	luai_writestringerror("%s\n", lua_tostring(L, -1));
354	lua_settop(L, 0); /* remove eventual returns */
355	}
356	}
357
358
359	static int db_traceback (lua_State *L) {
360	int arg;
361	lua_State *L1 = getthread(L, &arg);
362	const char *msg = lua_tostring(L, arg + 1);
363	if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */
364	lua_pushvalue(L, arg + 1); /* return it untouched */
365	else {
366	int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0);
367	luaL_traceback(L, L1, msg, level);
368	}
369	return 1;
370	}
371
372
373	static const luaL_Reg dblib[] = {
374	{"debug", db_debug},
375	{"getuservalue", db_getuservalue},
376	{"gethook", db_gethook},
377	{"getinfo", db_getinfo},
378	{"getlocal", db_getlocal},
379	{"getregistry", db_getregistry},
380	{"getmetatable", db_getmetatable},
381	{"getupvalue", db_getupvalue},
382	{"upvaluejoin", db_upvaluejoin},
383	{"upvalueid", db_upvalueid},
384	{"setuservalue", db_setuservalue},
385	{"sethook", db_sethook},
386	{"setlocal", db_setlocal},
387	{"setmetatable", db_setmetatable},
388	{"setupvalue", db_setupvalue},
389	{"traceback", db_traceback},
390	{NULL, NULL}
391	};
392
393
394	LUAMOD_API int luaopen_debug (lua_State *L) {
395	luaL_newlib(L, dblib);
396	return 1;
397	}
398