| /* |
| ** inout.c |
| ** Provide function to realise the input/output function and debugger |
| ** facilities. |
| ** Also provides some predefined lua functions. |
| */ |
| |
| char *rcs_inout="$Id: inout.c,v 2.56 1997/04/06 14:08:08 roberto Exp roberto $"; |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "auxlib.h" |
| #include "lex.h" |
| #include "opcode.h" |
| #include "inout.h" |
| #include "table.h" |
| #include "tree.h" |
| #include "lua.h" |
| #include "hash.h" |
| #include "luamem.h" |
| #include "fallback.h" |
| #include "luamem.h" |
| |
| |
| /* Exported variables */ |
| Word lua_linenumber; |
| char *lua_parsedfile; |
| |
| |
| char *luaI_typenames[] = { /* ORDER LUA_T */ |
| "userdata", "line", "cmark", "mark", "function", |
| "function", "table", "string", "number", "nil", |
| NULL |
| }; |
| |
| static FILE *fp; |
| static char *st; |
| |
| /* |
| ** Function to get the next character from the input file |
| */ |
| static int fileinput (void) |
| { |
| int c = fgetc(fp); |
| return (c == EOF) ? 0 : c; |
| } |
| |
| /* |
| ** Function to get the next character from the input string |
| */ |
| static int stringinput (void) |
| { |
| return *st++; |
| } |
| |
| /* |
| ** Function to open a file to be input unit. |
| ** Return the file. |
| */ |
| FILE *lua_openfile (char *fn) |
| { |
| lua_setinput (fileinput); |
| if (fn == NULL) |
| { |
| fp = stdin; |
| fn = "(stdin)"; |
| } |
| else |
| fp = fopen (fn, "r"); |
| if (fp == NULL) |
| return NULL; |
| lua_parsedfile = luaI_createfixedstring(fn)->str; |
| return fp; |
| } |
| |
| /* |
| ** Function to close an opened file |
| */ |
| void lua_closefile (void) |
| { |
| if (fp != NULL && fp != stdin) |
| { |
| fclose (fp); |
| fp = NULL; |
| } |
| } |
| |
| /* |
| ** Function to open a string to be input unit |
| */ |
| #define SIZE_PREF 20 /* size of string prefix to appear in error messages */ |
| void lua_openstring (char *s) |
| { |
| char buff[SIZE_PREF+25]; |
| lua_setinput(stringinput); |
| st = s; |
| sprintf(buff, "(dostring) >> %.20s%s", s, |
| (strlen(s) > SIZE_PREF) ? "..." : ""); |
| lua_parsedfile = luaI_createfixedstring(buff)->str; |
| } |
| |
| /* |
| ** Function to close an opened string |
| */ |
| void lua_closestring (void) |
| { |
| } |
| |
| |
| static int passresults (void) |
| { |
| int arg = 0; |
| lua_Object obj; |
| while ((obj = lua_getresult(++arg)) != LUA_NOOBJECT) |
| lua_pushobject(obj); |
| return arg-1; |
| } |
| |
| /* |
| ** Internal function: do a string |
| */ |
| static void lua_internaldostring (void) |
| { |
| if (lua_dostring(luaL_check_string(1)) == 0) |
| if (passresults() == 0) |
| lua_pushuserdata(NULL); /* at least one result to signal no errors */ |
| } |
| |
| /* |
| ** Internal function: do a file |
| */ |
| static void lua_internaldofile (void) |
| { |
| char *fname = luaL_opt_string(1, NULL); |
| if (lua_dofile(fname) == 0) |
| if (passresults() == 0) |
| lua_pushuserdata(NULL); /* at least one result to signal no errors */ |
| } |
| |
| |
| static char *tostring (lua_Object obj) |
| { |
| TObject *o = luaI_Address(obj); |
| switch (ttype(o)) { |
| case LUA_T_NUMBER: case LUA_T_STRING: |
| return lua_getstring(obj); |
| case LUA_T_ARRAY: case LUA_T_FUNCTION: |
| case LUA_T_CFUNCTION: case LUA_T_NIL: |
| return luaI_typenames[-ttype(o)]; |
| case LUA_T_USERDATA: { |
| char *buff = luaI_buffer(100); |
| int size = o->value.ts->size; |
| int i; |
| strcpy(buff, "userdata: "); |
| if (size > 10) size = 10; |
| for (i=0; i<size; i++) |
| sprintf(buff+strlen(buff), "%.2X", |
| (int)(unsigned char)o->value.ts->str[i]); |
| return buff; |
| } |
| default: return "<unknown object>"; |
| } |
| } |
| |
| static void luaI_tostring (void) |
| { |
| lua_pushstring(tostring(lua_getparam(1))); |
| } |
| |
| static void luaI_print (void) |
| { |
| int i = 1; |
| lua_Object obj; |
| while ((obj = lua_getparam(i++)) != LUA_NOOBJECT) |
| printf("%s\n", tostring(obj)); |
| } |
| |
| static void luaI_type (void) |
| { |
| lua_Object o = lua_getparam(1); |
| luaL_arg_check(o != LUA_NOOBJECT, 1, "no argument"); |
| lua_pushstring(luaI_typenames[-ttype(luaI_Address(o))]); |
| lua_pushnumber(lua_tag(o)); |
| } |
| |
| /* |
| ** Internal function: convert an object to a number |
| */ |
| static void lua_obj2number (void) |
| { |
| lua_Object o = lua_getparam(1); |
| if (lua_isnumber(o)) |
| lua_pushnumber(lua_getnumber(o)); |
| } |
| |
| |
| static void luaI_error (void) |
| { |
| char *s = lua_getstring(lua_getparam(1)); |
| if (s == NULL) s = "(no message)"; |
| lua_error(s); |
| } |
| |
| static void luaI_assert (void) |
| { |
| lua_Object p = lua_getparam(1); |
| if (p == LUA_NOOBJECT || lua_isnil(p)) |
| lua_error("assertion failed!"); |
| } |
| |
| static void luaI_setglobal (void) |
| { |
| lua_Object value = lua_getparam(2); |
| luaL_arg_check(value != LUA_NOOBJECT, 2, NULL); |
| lua_pushobject(value); |
| lua_setglobal(luaL_check_string(1)); |
| lua_pushobject(value); /* return given value */ |
| } |
| |
| static void luaI_rawsetglobal (void) |
| { |
| lua_Object value = lua_getparam(2); |
| luaL_arg_check(value != LUA_NOOBJECT, 2, NULL); |
| lua_pushobject(value); |
| lua_rawsetglobal(luaL_check_string(1)); |
| lua_pushobject(value); /* return given value */ |
| } |
| |
| static void luaI_getglobal (void) |
| { |
| lua_pushobject(lua_getglobal(luaL_check_string(1))); |
| } |
| |
| static void luaI_rawgetglobal (void) |
| { |
| lua_pushobject(lua_rawgetglobal(luaL_check_string(1))); |
| } |
| |
| static void luatag (void) |
| { |
| lua_pushnumber(lua_tag(lua_getparam(1))); |
| } |
| |
| #define MAXPARAMS 256 |
| static void luaI_call (void) |
| { |
| lua_Object f = lua_getparam(1); |
| lua_Object arg = lua_getparam(2); |
| lua_Object temp, params[MAXPARAMS]; |
| int narg, i; |
| luaL_arg_check(lua_isfunction(f), 1, "function expected"); |
| luaL_arg_check(lua_istable(arg), 2, "table expected"); |
| /* narg = arg.n */ |
| lua_pushobject(arg); |
| lua_pushstring("n"); |
| temp = lua_getsubscript(); |
| narg = lua_isnumber(temp) ? lua_getnumber(temp) : MAXPARAMS+1; |
| /* read arg[1...n] */ |
| for (i=0; i<narg; i++) { |
| if (i>=MAXPARAMS) |
| lua_error("argument list too long in function `call'"); |
| lua_pushobject(arg); |
| lua_pushnumber(i+1); |
| params[i] = lua_getsubscript(); |
| if (narg == MAXPARAMS+1 && lua_isnil(params[i])) { |
| narg = i; |
| break; |
| } |
| } |
| /* push parameters and do the call */ |
| for (i=0; i<narg; i++) |
| lua_pushobject(params[i]); |
| if (lua_callfunction(f)) |
| lua_error(NULL); |
| else |
| passresults(); |
| } |
| |
| static void luaIl_settag (void) |
| { |
| lua_Object o = lua_getparam(1); |
| luaL_arg_check(o != LUA_NOOBJECT, 1, NULL); |
| lua_pushobject(o); |
| lua_settag(luaL_check_number(2)); |
| } |
| |
| static void luaIl_newtag (void) |
| { |
| lua_pushnumber(lua_newtag()); |
| } |
| |
| static void rawgettable (void) |
| { |
| lua_Object t = lua_getparam(1); |
| lua_Object i = lua_getparam(2); |
| luaL_arg_check(t != LUA_NOOBJECT, 1, NULL); |
| luaL_arg_check(i != LUA_NOOBJECT, 2, NULL); |
| lua_pushobject(t); |
| lua_pushobject(i); |
| lua_pushobject(lua_rawgettable()); |
| } |
| |
| static void rawsettable (void) |
| { |
| lua_Object t = lua_getparam(1); |
| lua_Object i = lua_getparam(2); |
| lua_Object v = lua_getparam(3); |
| luaL_arg_check(t != LUA_NOOBJECT && i != LUA_NOOBJECT && v != LUA_NOOBJECT, |
| 0, NULL); |
| lua_pushobject(t); |
| lua_pushobject(i); |
| lua_pushobject(v); |
| lua_rawsettable(); |
| } |
| |
| |
| |
| /* |
| ** Internal functions |
| */ |
| static struct { |
| char *name; |
| lua_CFunction func; |
| } int_funcs[] = { |
| {"assert", luaI_assert}, |
| {"call", luaI_call}, |
| {"dofile", lua_internaldofile}, |
| {"dostring", lua_internaldostring}, |
| {"error", luaI_error}, |
| {"getglobal", luaI_getglobal}, |
| {"newtag", luaIl_newtag}, |
| {"next", lua_next}, |
| {"nextvar", luaI_nextvar}, |
| {"print", luaI_print}, |
| {"rawgetglobal", luaI_rawgetglobal}, |
| {"rawgettable", rawgettable}, |
| {"rawsetglobal", luaI_rawsetglobal}, |
| {"rawsettable", rawsettable}, |
| {"seterrormethod", luaI_seterrormethod}, |
| {"setfallback", luaI_setfallback}, |
| {"setglobal", luaI_setglobal}, |
| {"settagmethod", luaI_settagmethod}, |
| {"gettagmethod", luaI_gettagmethod}, |
| {"settag", luaIl_settag}, |
| {"tonumber", lua_obj2number}, |
| {"tostring", luaI_tostring}, |
| {"tag", luatag}, |
| {"type", luaI_type} |
| }; |
| |
| #define INTFUNCSIZE (sizeof(int_funcs)/sizeof(int_funcs[0])) |
| |
| |
| void luaI_predefine (void) |
| { |
| int i; |
| Word n; |
| for (i=0; i<INTFUNCSIZE; i++) { |
| n = luaI_findsymbolbyname(int_funcs[i].name); |
| s_ttype(n) = LUA_T_CFUNCTION; s_fvalue(n) = int_funcs[i].func; |
| } |
| n = luaI_findsymbolbyname("_VERSION_"); |
| s_ttype(n) = LUA_T_STRING; s_tsvalue(n) = lua_createstring(LUA_VERSION); |
| } |
| |
| |