rlm@1: /*
rlm@1: ** $Id: lauxlib.c,v 1.159.1.3 2008/01/21 13:20:51 roberto Exp $
rlm@1: ** Auxiliary functions for building Lua libraries
rlm@1: ** See Copyright Notice in lua.h
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: #include <ctype.h>
rlm@1: #include <errno.h>
rlm@1: #include <stdarg.h>
rlm@1: #include <stdio.h>
rlm@1: #include <stdlib.h>
rlm@1: #include <string.h>
rlm@1: 
rlm@1: 
rlm@1: /* This file uses only the official API of Lua.
rlm@1: ** Any function declared here could be written as an application function.
rlm@1: */
rlm@1: 
rlm@1: #define lauxlib_c
rlm@1: #define LUA_LIB
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "lauxlib.h"
rlm@1: 
rlm@1: 
rlm@1: #define FREELIST_REF	0	/* free list of references */
rlm@1: 
rlm@1: 
rlm@1: /* convert a stack index to positive */
rlm@1: #define abs_index(L, i)		((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
rlm@1: 					lua_gettop(L) + (i) + 1)
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** {======================================================
rlm@1: ** Error-report functions
rlm@1: ** =======================================================
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
rlm@1:   lua_Debug ar;
rlm@1:   if (!lua_getstack(L, 0, &ar))  /* no stack frame? */
rlm@1:     return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
rlm@1:   lua_getinfo(L, "n", &ar);
rlm@1:   if (strcmp(ar.namewhat, "method") == 0) {
rlm@1:     narg--;  /* do not count `self' */
rlm@1:     if (narg == 0)  /* error is in the self argument itself? */
rlm@1:       return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
rlm@1:                            ar.name, extramsg);
rlm@1:   }
rlm@1:   if (ar.name == NULL)
rlm@1:     ar.name = "?";
rlm@1:   return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
rlm@1:                         narg, ar.name, extramsg);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
rlm@1:   const char *msg = lua_pushfstring(L, "%s expected, got %s",
rlm@1:                                     tname, luaL_typename(L, narg));
rlm@1:   return luaL_argerror(L, narg, msg);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void tag_error (lua_State *L, int narg, int tag) {
rlm@1:   luaL_typerror(L, narg, lua_typename(L, tag));
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_where (lua_State *L, int level) {
rlm@1:   lua_Debug ar;
rlm@1:   if (lua_getstack(L, level, &ar)) {  /* check function at level */
rlm@1:     lua_getinfo(L, "Sl", &ar);  /* get info about it */
rlm@1:     if (ar.currentline > 0) {  /* is there info? */
rlm@1:       lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
rlm@1:       return;
rlm@1:     }
rlm@1:   }
rlm@1:   lua_pushliteral(L, "");  /* else, no information available... */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
rlm@1:   va_list argp;
rlm@1:   va_start(argp, fmt);
rlm@1:   luaL_where(L, 1);
rlm@1:   lua_pushvfstring(L, fmt, argp);
rlm@1:   va_end(argp);
rlm@1:   lua_concat(L, 2);
rlm@1:   return lua_error(L);
rlm@1: }
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
rlm@1:                                  const char *const lst[]) {
rlm@1:   const char *name = (def) ? luaL_optstring(L, narg, def) :
rlm@1:                              luaL_checkstring(L, narg);
rlm@1:   int i;
rlm@1:   for (i=0; lst[i]; i++)
rlm@1:     if (strcmp(lst[i], name) == 0)
rlm@1:       return i;
rlm@1:   return luaL_argerror(L, narg,
rlm@1:                        lua_pushfstring(L, "invalid option " LUA_QS, name));
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
rlm@1:   lua_getfield(L, LUA_REGISTRYINDEX, tname);  /* get registry.name */
rlm@1:   if (!lua_isnil(L, -1))  /* name already in use? */
rlm@1:     return 0;  /* leave previous value on top, but return 0 */
rlm@1:   lua_pop(L, 1);
rlm@1:   lua_newtable(L);  /* create metatable */
rlm@1:   lua_pushvalue(L, -1);
rlm@1:   lua_setfield(L, LUA_REGISTRYINDEX, tname);  /* registry.name = metatable */
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
rlm@1:   void *p = lua_touserdata(L, ud);
rlm@1:   if (p != NULL) {  /* value is a userdata? */
rlm@1:     if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */
rlm@1:       lua_getfield(L, LUA_REGISTRYINDEX, tname);  /* get correct metatable */
rlm@1:       if (lua_rawequal(L, -1, -2)) {  /* does it have the correct mt? */
rlm@1:         lua_pop(L, 2);  /* remove both metatables */
rlm@1:         return p;
rlm@1:       }
rlm@1:     }
rlm@1:   }
rlm@1:   luaL_typerror(L, ud, tname);  /* else error */
rlm@1:   return NULL;  /* to avoid warnings */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
rlm@1:   if (!lua_checkstack(L, space))
rlm@1:     luaL_error(L, "stack overflow (%s)", mes);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
rlm@1:   if (lua_type(L, narg) != t)
rlm@1:     tag_error(L, narg, t);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_checkany (lua_State *L, int narg) {
rlm@1:   if (lua_type(L, narg) == LUA_TNONE)
rlm@1:     luaL_argerror(L, narg, "value expected");
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
rlm@1:   const char *s = lua_tolstring(L, narg, len);
rlm@1:   if (!s) tag_error(L, narg, LUA_TSTRING);
rlm@1:   return s;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
rlm@1:                                         const char *def, size_t *len) {
rlm@1:   if (lua_isnoneornil(L, narg)) {
rlm@1:     if (len)
rlm@1:       *len = (def ? strlen(def) : 0);
rlm@1:     return def;
rlm@1:   }
rlm@1:   else return luaL_checklstring(L, narg, len);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
rlm@1:   lua_Number d = lua_tonumber(L, narg);
rlm@1:   if (d == 0 && !lua_isnumber(L, narg))  /* avoid extra test when d is not 0 */
rlm@1:     tag_error(L, narg, LUA_TNUMBER);
rlm@1:   return d;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
rlm@1:   return luaL_opt(L, luaL_checknumber, narg, def);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
rlm@1:   lua_Integer d = lua_tointeger(L, narg);
rlm@1:   if (d == 0 && !lua_isnumber(L, narg))  /* avoid extra test when d is not 0 */
rlm@1:     tag_error(L, narg, LUA_TNUMBER);
rlm@1:   return d;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
rlm@1:                                                       lua_Integer def) {
rlm@1:   return luaL_opt(L, luaL_checkinteger, narg, def);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
rlm@1:   if (!lua_getmetatable(L, obj))  /* no metatable? */
rlm@1:     return 0;
rlm@1:   lua_pushstring(L, event);
rlm@1:   lua_rawget(L, -2);
rlm@1:   if (lua_isnil(L, -1)) {
rlm@1:     lua_pop(L, 2);  /* remove metatable and metafield */
rlm@1:     return 0;
rlm@1:   }
rlm@1:   else {
rlm@1:     lua_remove(L, -2);  /* remove only metatable */
rlm@1:     return 1;
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
rlm@1:   obj = abs_index(L, obj);
rlm@1:   if (!luaL_getmetafield(L, obj, event))  /* no metafield? */
rlm@1:     return 0;
rlm@1:   lua_pushvalue(L, obj);
rlm@1:   lua_call(L, 1, 1);
rlm@1:   return 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
rlm@1:                                 const luaL_Reg *l) {
rlm@1:   luaI_openlib(L, libname, l, 0);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int libsize (const luaL_Reg *l) {
rlm@1:   int size = 0;
rlm@1:   for (; l->name; l++) size++;
rlm@1:   return size;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
rlm@1:                               const luaL_Reg *l, int nup) {
rlm@1:   if (libname) {
rlm@1:     int size = libsize(l);
rlm@1:     /* check whether lib already exists */
rlm@1:     luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
rlm@1:     lua_getfield(L, -1, libname);  /* get _LOADED[libname] */
rlm@1:     if (!lua_istable(L, -1)) {  /* not found? */
rlm@1:       lua_pop(L, 1);  /* remove previous result */
rlm@1:       /* try global variable (and create one if it does not exist) */
rlm@1:       if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
rlm@1:         luaL_error(L, "name conflict for module " LUA_QS, libname);
rlm@1:       lua_pushvalue(L, -1);
rlm@1:       lua_setfield(L, -3, libname);  /* _LOADED[libname] = new table */
rlm@1:     }
rlm@1:     lua_remove(L, -2);  /* remove _LOADED table */
rlm@1:     lua_insert(L, -(nup+1));  /* move library table to below upvalues */
rlm@1:   }
rlm@1:   for (; l->name; l++) {
rlm@1:     int i;
rlm@1:     for (i=0; i<nup; i++)  /* copy upvalues to the top */
rlm@1:       lua_pushvalue(L, -nup);
rlm@1:     lua_pushcclosure(L, l->func, nup);
rlm@1:     lua_setfield(L, -(nup+2), l->name);
rlm@1:   }
rlm@1:   lua_pop(L, nup);  /* remove upvalues */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** {======================================================
rlm@1: ** getn-setn: size for arrays
rlm@1: ** =======================================================
rlm@1: */
rlm@1: 
rlm@1: #if defined(LUA_COMPAT_GETN)
rlm@1: 
rlm@1: static int checkint (lua_State *L, int topop) {
rlm@1:   int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
rlm@1:   lua_pop(L, topop);
rlm@1:   return n;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void getsizes (lua_State *L) {
rlm@1:   lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
rlm@1:   if (lua_isnil(L, -1)) {  /* no `size' table? */
rlm@1:     lua_pop(L, 1);  /* remove nil */
rlm@1:     lua_newtable(L);  /* create it */
rlm@1:     lua_pushvalue(L, -1);  /* `size' will be its own metatable */
rlm@1:     lua_setmetatable(L, -2);
rlm@1:     lua_pushliteral(L, "kv");
rlm@1:     lua_setfield(L, -2, "__mode");  /* metatable(N).__mode = "kv" */
rlm@1:     lua_pushvalue(L, -1);
rlm@1:     lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");  /* store in register */
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
rlm@1:   t = abs_index(L, t);
rlm@1:   lua_pushliteral(L, "n");
rlm@1:   lua_rawget(L, t);
rlm@1:   if (checkint(L, 1) >= 0) {  /* is there a numeric field `n'? */
rlm@1:     lua_pushliteral(L, "n");  /* use it */
rlm@1:     lua_pushinteger(L, n);
rlm@1:     lua_rawset(L, t);
rlm@1:   }
rlm@1:   else {  /* use `sizes' */
rlm@1:     getsizes(L);
rlm@1:     lua_pushvalue(L, t);
rlm@1:     lua_pushinteger(L, n);
rlm@1:     lua_rawset(L, -3);  /* sizes[t] = n */
rlm@1:     lua_pop(L, 1);  /* remove `sizes' */
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_getn (lua_State *L, int t) {
rlm@1:   int n;
rlm@1:   t = abs_index(L, t);
rlm@1:   lua_pushliteral(L, "n");  /* try t.n */
rlm@1:   lua_rawget(L, t);
rlm@1:   if ((n = checkint(L, 1)) >= 0) return n;
rlm@1:   getsizes(L);  /* else try sizes[t] */
rlm@1:   lua_pushvalue(L, t);
rlm@1:   lua_rawget(L, -2);
rlm@1:   if ((n = checkint(L, 2)) >= 0) return n;
rlm@1:   return (int)lua_objlen(L, t);
rlm@1: }
rlm@1: 
rlm@1: #endif
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
rlm@1:                                                                const char *r) {
rlm@1:   const char *wild;
rlm@1:   size_t l = strlen(p);
rlm@1:   luaL_Buffer b;
rlm@1:   luaL_buffinit(L, &b);
rlm@1:   while ((wild = strstr(s, p)) != NULL) {
rlm@1:     luaL_addlstring(&b, s, wild - s);  /* push prefix */
rlm@1:     luaL_addstring(&b, r);  /* push replacement in place of pattern */
rlm@1:     s = wild + l;  /* continue after `p' */
rlm@1:   }
rlm@1:   luaL_addstring(&b, s);  /* push last suffix */
rlm@1:   luaL_pushresult(&b);
rlm@1:   return lua_tostring(L, -1);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
rlm@1:                                        const char *fname, int szhint) {
rlm@1:   const char *e;
rlm@1:   lua_pushvalue(L, idx);
rlm@1:   do {
rlm@1:     e = strchr(fname, '.');
rlm@1:     if (e == NULL) e = fname + strlen(fname);
rlm@1:     lua_pushlstring(L, fname, e - fname);
rlm@1:     lua_rawget(L, -2);
rlm@1:     if (lua_isnil(L, -1)) {  /* no such field? */
rlm@1:       lua_pop(L, 1);  /* remove this nil */
rlm@1:       lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
rlm@1:       lua_pushlstring(L, fname, e - fname);
rlm@1:       lua_pushvalue(L, -2);
rlm@1:       lua_settable(L, -4);  /* set new table into field */
rlm@1:     }
rlm@1:     else if (!lua_istable(L, -1)) {  /* field has a non-table value? */
rlm@1:       lua_pop(L, 2);  /* remove table and value */
rlm@1:       return fname;  /* return problematic part of the name */
rlm@1:     }
rlm@1:     lua_remove(L, -2);  /* remove previous table */
rlm@1:     fname = e + 1;
rlm@1:   } while (*e == '.');
rlm@1:   return NULL;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** {======================================================
rlm@1: ** Generic Buffer manipulation
rlm@1: ** =======================================================
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: #define bufflen(B)	((B)->p - (B)->buffer)
rlm@1: #define bufffree(B)	((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
rlm@1: 
rlm@1: #define LIMIT	(LUA_MINSTACK/2)
rlm@1: 
rlm@1: 
rlm@1: static int emptybuffer (luaL_Buffer *B) {
rlm@1:   size_t l = bufflen(B);
rlm@1:   if (l == 0) return 0;  /* put nothing on stack */
rlm@1:   else {
rlm@1:     lua_pushlstring(B->L, B->buffer, l);
rlm@1:     B->p = B->buffer;
rlm@1:     B->lvl++;
rlm@1:     return 1;
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void adjuststack (luaL_Buffer *B) {
rlm@1:   if (B->lvl > 1) {
rlm@1:     lua_State *L = B->L;
rlm@1:     int toget = 1;  /* number of levels to concat */
rlm@1:     size_t toplen = lua_strlen(L, -1);
rlm@1:     do {
rlm@1:       size_t l = lua_strlen(L, -(toget+1));
rlm@1:       if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
rlm@1:         toplen += l;
rlm@1:         toget++;
rlm@1:       }
rlm@1:       else break;
rlm@1:     } while (toget < B->lvl);
rlm@1:     lua_concat(L, toget);
rlm@1:     B->lvl = B->lvl - toget + 1;
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
rlm@1:   if (emptybuffer(B))
rlm@1:     adjuststack(B);
rlm@1:   return B->buffer;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
rlm@1:   while (l--)
rlm@1:     luaL_addchar(B, *s++);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
rlm@1:   luaL_addlstring(B, s, strlen(s));
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
rlm@1:   emptybuffer(B);
rlm@1:   lua_concat(B->L, B->lvl);
rlm@1:   B->lvl = 1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
rlm@1:   lua_State *L = B->L;
rlm@1:   size_t vl;
rlm@1:   const char *s = lua_tolstring(L, -1, &vl);
rlm@1:   if (vl <= bufffree(B)) {  /* fit into buffer? */
rlm@1:     memcpy(B->p, s, vl);  /* put it there */
rlm@1:     B->p += vl;
rlm@1:     lua_pop(L, 1);  /* remove from stack */
rlm@1:   }
rlm@1:   else {
rlm@1:     if (emptybuffer(B))
rlm@1:       lua_insert(L, -2);  /* put buffer before new value */
rlm@1:     B->lvl++;  /* add new value into B stack */
rlm@1:     adjuststack(B);
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
rlm@1:   B->L = L;
rlm@1:   B->p = B->buffer;
rlm@1:   B->lvl = 0;
rlm@1: }
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_ref (lua_State *L, int t) {
rlm@1:   int ref;
rlm@1:   t = abs_index(L, t);
rlm@1:   if (lua_isnil(L, -1)) {
rlm@1:     lua_pop(L, 1);  /* remove from stack */
rlm@1:     return LUA_REFNIL;  /* `nil' has a unique fixed reference */
rlm@1:   }
rlm@1:   lua_rawgeti(L, t, FREELIST_REF);  /* get first free element */
rlm@1:   ref = (int)lua_tointeger(L, -1);  /* ref = t[FREELIST_REF] */
rlm@1:   lua_pop(L, 1);  /* remove it from stack */
rlm@1:   if (ref != 0) {  /* any free element? */
rlm@1:     lua_rawgeti(L, t, ref);  /* remove it from list */
rlm@1:     lua_rawseti(L, t, FREELIST_REF);  /* (t[FREELIST_REF] = t[ref]) */
rlm@1:   }
rlm@1:   else {  /* no free elements */
rlm@1:     ref = (int)lua_objlen(L, t);
rlm@1:     ref++;  /* create new reference */
rlm@1:   }
rlm@1:   lua_rawseti(L, t, ref);
rlm@1:   return ref;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
rlm@1:   if (ref >= 0) {
rlm@1:     t = abs_index(L, t);
rlm@1:     lua_rawgeti(L, t, FREELIST_REF);
rlm@1:     lua_rawseti(L, t, ref);  /* t[ref] = t[FREELIST_REF] */
rlm@1:     lua_pushinteger(L, ref);
rlm@1:     lua_rawseti(L, t, FREELIST_REF);  /* t[FREELIST_REF] = ref */
rlm@1:   }
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** {======================================================
rlm@1: ** Load functions
rlm@1: ** =======================================================
rlm@1: */
rlm@1: 
rlm@1: typedef struct LoadF {
rlm@1:   int extraline;
rlm@1:   FILE *f;
rlm@1:   char buff[LUAL_BUFFERSIZE];
rlm@1: } LoadF;
rlm@1: 
rlm@1: 
rlm@1: static const char *getF (lua_State *L, void *ud, size_t *size) {
rlm@1:   LoadF *lf = (LoadF *)ud;
rlm@1:   (void)L;
rlm@1:   if (lf->extraline) {
rlm@1:     lf->extraline = 0;
rlm@1:     *size = 1;
rlm@1:     return "\n";
rlm@1:   }
rlm@1:   if (feof(lf->f)) return NULL;
rlm@1:   *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f);
rlm@1:   return (*size > 0) ? lf->buff : NULL;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int errfile (lua_State *L, const char *what, int fnameindex) {
rlm@1:   const char *serr = strerror(errno);
rlm@1:   const char *filename = lua_tostring(L, fnameindex) + 1;
rlm@1:   lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
rlm@1:   lua_remove(L, fnameindex);
rlm@1:   return LUA_ERRFILE;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
rlm@1:   LoadF lf;
rlm@1:   int status, readstatus;
rlm@1:   int c;
rlm@1:   int fnameindex = lua_gettop(L) + 1;  /* index of filename on the stack */
rlm@1:   lf.extraline = 0;
rlm@1:   if (filename == NULL) {
rlm@1:     lua_pushliteral(L, "=stdin");
rlm@1:     lf.f = stdin;
rlm@1:   }
rlm@1:   else {
rlm@1:     lua_pushfstring(L, "@%s", filename);
rlm@1:     lf.f = fopen(filename, "r");
rlm@1:     if (lf.f == NULL) return errfile(L, "open", fnameindex);
rlm@1:   }
rlm@1:   c = getc(lf.f);
rlm@1:   if (c == '#') {  /* Unix exec. file? */
rlm@1:     lf.extraline = 1;
rlm@1:     while ((c = getc(lf.f)) != EOF && c != '\n') ;  /* skip first line */
rlm@1:     if (c == '\n') c = getc(lf.f);
rlm@1:   }
rlm@1:   if (c == LUA_SIGNATURE[0] && filename) {  /* binary file? */
rlm@1:     lf.f = freopen(filename, "rb", lf.f);  /* reopen in binary mode */
rlm@1:     if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
rlm@1:     /* skip eventual `#!...' */
rlm@1:    while ((c = getc(lf.f)) != EOF && c != LUA_SIGNATURE[0]) ;
rlm@1:     lf.extraline = 0;
rlm@1:   }
rlm@1:   ungetc(c, lf.f);
rlm@1:   status = lua_load(L, getF, &lf, lua_tostring(L, -1));
rlm@1:   readstatus = ferror(lf.f);
rlm@1:   if (filename) fclose(lf.f);  /* close file (even in case of errors) */
rlm@1:   if (readstatus) {
rlm@1:     lua_settop(L, fnameindex);  /* ignore results from `lua_load' */
rlm@1:     return errfile(L, "read", fnameindex);
rlm@1:   }
rlm@1:   lua_remove(L, fnameindex);
rlm@1:   return status;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: typedef struct LoadS {
rlm@1:   const char *s;
rlm@1:   size_t size;
rlm@1: } LoadS;
rlm@1: 
rlm@1: 
rlm@1: static const char *getS (lua_State *L, void *ud, size_t *size) {
rlm@1:   LoadS *ls = (LoadS *)ud;
rlm@1:   (void)L;
rlm@1:   if (ls->size == 0) return NULL;
rlm@1:   *size = ls->size;
rlm@1:   ls->size = 0;
rlm@1:   return ls->s;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
rlm@1:                                 const char *name) {
rlm@1:   LoadS ls;
rlm@1:   ls.s = buff;
rlm@1:   ls.size = size;
rlm@1:   return lua_load(L, getS, &ls, name);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
rlm@1:   return luaL_loadbuffer(L, s, strlen(s), s);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: 
rlm@1: /* }====================================================== */
rlm@1: 
rlm@1: 
rlm@1: static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
rlm@1:   (void)ud;
rlm@1:   (void)osize;
rlm@1:   if (nsize == 0) {
rlm@1:     free(ptr);
rlm@1:     return NULL;
rlm@1:   }
rlm@1:   else
rlm@1:     return realloc(ptr, nsize);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static int panic (lua_State *L) {
rlm@1:   (void)L;  /* to avoid warnings */
rlm@1:   fprintf(stderr, "PANIC: unprotected error in call to Lua API (%s)\n",
rlm@1:                    lua_tostring(L, -1));
rlm@1:   return 0;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUALIB_API lua_State *luaL_newstate (void) {
rlm@1:   lua_State *L = lua_newstate(l_alloc, NULL);
rlm@1:   if (L) lua_atpanic(L, &panic);
rlm@1:   return L;
rlm@1: }
rlm@1: