Lua 5.1.4: lauxlib.c

L0001    /*
L0002    ** $Id: lauxlib.c,v 1.159.1.3 2008/01/21 13:20:51 roberto Exp $
L0003    ** Auxiliary functions for building Lua libraries
L0004    ** See Copyright Notice in lua.h
L0005    */
L0006    
L0007    
L0008    #include <ctype.h>
L0009    #include <errno.h>
L0010    #include <stdarg.h>
L0011    #include <stdio.h>
L0012    #include <stdlib.h>
L0013    #include <string.h>
L0014    
L0015    
L0016    /* This file uses only the official API of Lua.
L0017    ** Any function declared here could be written as an application function.
L0018    */
L0019    
L0020    #define lauxlib_c
L0021    #define LUA_LIB
L0022    
L0023    #include "lua.h"
L0024    
L0025    #include "lauxlib.h"
L0026    
L0027    
L0028    #define FREELIST_REF	0	/* free list of references */
L0029    
L0030    
L0031    /* convert a stack index to positive */
L0032    #define abs_index(L, i)		((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
L0033    					lua_gettop(L) + (i) + 1)
L0034    
L0035    
L0036    /*
L0037    ** {======================================================
L0038    ** Error-report functions
L0039    ** =======================================================
L0040    */
L0041    
L0042    
L0043    LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
manc:luaL_argerror
L0044      lua_Debug ar;
L0045      if (!lua_getstack(L, 0, &ar))  /* no stack frame? */
L0046        return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
L0047      lua_getinfo(L, "n", &ar);
L0048      if (strcmp(ar.namewhat, "method") == 0) {
L0049        narg--;  /* do not count `self' */
L0050        if (narg == 0)  /* error is in the self argument itself? */
L0051          return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
L0052                               ar.name, extramsg);
L0053      }
L0054      if (ar.name == NULL)
L0055        ar.name = "?";
L0056      return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
L0057                            narg, ar.name, extramsg);
L0058    }
L0059    
L0060    
L0061    LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
manc:luaL_typerror
L0062      const char *msg = lua_pushfstring(L, "%s expected, got %s",
L0063                                        tname, luaL_typename(L, narg));
L0064      return luaL_argerror(L, narg, msg);
L0065    }
L0066    
L0067    
L0068    static void tag_error (lua_State *L, int narg, int tag) {
L0069      luaL_typerror(L, narg, lua_typename(L, tag));
L0070    }
L0071    
L0072    
L0073    LUALIB_API void luaL_where (lua_State *L, int level) {
manc:luaL_where
L0074      lua_Debug ar;
L0075      if (lua_getstack(L, level, &ar)) {  /* check function at level */
L0076        lua_getinfo(L, "Sl", &ar);  /* get info about it */
L0077        if (ar.currentline > 0) {  /* is there info? */
L0078          lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
L0079          return;
L0080        }
L0081      }
L0082      lua_pushliteral(L, "");  /* else, no information available... */
L0083    }
L0084    
L0085    
L0086    LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
manc:luaL_error
L0087      va_list argp;
L0088      va_start(argp, fmt);
L0089      luaL_where(L, 1);
L0090      lua_pushvfstring(L, fmt, argp);
L0091      va_end(argp);
L0092      lua_concat(L, 2);
L0093      return lua_error(L);
L0094    }
L0095    
L0096    /* }====================================================== */
L0097    
L0098    
L0099    LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
manc:luaL_checkoption
L0100                                     const char *const lst[]) {
L0101      const char *name = (def) ? luaL_optstring(L, narg, def) :
L0102                                 luaL_checkstring(L, narg);
L0103      int i;
L0104      for (i=0; lst[i]; i++)
L0105        if (strcmp(lst[i], name) == 0)
L0106          return i;
L0107      return luaL_argerror(L, narg,
L0108                           lua_pushfstring(L, "invalid option " LUA_QS, name));
L0109    }
L0110    
L0111    
L0112    LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
manc:luaL_newmetatable
L0113      lua_getfield(L, LUA_REGISTRYINDEX, tname);  /* get registry.name */
L0114      if (!lua_isnil(L, -1))  /* name already in use? */
L0115        return 0;  /* leave previous value on top, but return 0 */
L0116      lua_pop(L, 1);
L0117      lua_newtable(L);  /* create metatable */
L0118      lua_pushvalue(L, -1);
L0119      lua_setfield(L, LUA_REGISTRYINDEX, tname);  /* registry.name = metatable */
L0120      return 1;
L0121    }
L0122    
L0123    
L0124    LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
manc:luaL_checkudata
L0125      void *p = lua_touserdata(L, ud);
L0126      if (p != NULL) {  /* value is a userdata? */
L0127        if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */
L0128          lua_getfield(L, LUA_REGISTRYINDEX, tname);  /* get correct metatable */
L0129          if (lua_rawequal(L, -1, -2)) {  /* does it have the correct mt? */
L0130            lua_pop(L, 2);  /* remove both metatables */
L0131            return p;
L0132          }
L0133        }
L0134      }
L0135      luaL_typerror(L, ud, tname);  /* else error */
L0136      return NULL;  /* to avoid warnings */
L0137    }
L0138    
L0139    
L0140    LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
manc:luaL_checkstack
L0141      if (!lua_checkstack(L, space))
L0142        luaL_error(L, "stack overflow (%s)", mes);
L0143    }
L0144    
L0145    
L0146    LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
manc:luaL_checktype
L0147      if (lua_type(L, narg) != t)
L0148        tag_error(L, narg, t);
L0149    }
L0150    
L0151    
L0152    LUALIB_API void luaL_checkany (lua_State *L, int narg) {
manc:luaL_checkany
L0153      if (lua_type(L, narg) == LUA_TNONE)
L0154        luaL_argerror(L, narg, "value expected");
L0155    }
L0156    
L0157    
L0158    LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
manc:luaL_checklstring
L0159      const char *s = lua_tolstring(L, narg, len);
L0160      if (!s) tag_error(L, narg, LUA_TSTRING);
L0161      return s;
L0162    }
L0163    
L0164    
L0165    LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
manc:luaL_optlstring
L0166                                            const char *def, size_t *len) {
L0167      if (lua_isnoneornil(L, narg)) {
L0168        if (len)
L0169          *len = (def ? strlen(def) : 0);
L0170        return def;
L0171      }
L0172      else return luaL_checklstring(L, narg, len);
L0173    }
L0174    
L0175    
L0176    LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
manc:luaL_checknumber
L0177      lua_Number d = lua_tonumber(L, narg);
L0178      if (d == 0 && !lua_isnumber(L, narg))  /* avoid extra test when d is not 0 */
L0179        tag_error(L, narg, LUA_TNUMBER);
L0180      return d;
L0181    }
L0182    
L0183    
L0184    LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
manc:luaL_optnumber
L0185      return luaL_opt(L, luaL_checknumber, narg, def);
L0186    }
L0187    
L0188    
L0189    LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
manc:luaL_checkinteger
L0190      lua_Integer d = lua_tointeger(L, narg);
L0191      if (d == 0 && !lua_isnumber(L, narg))  /* avoid extra test when d is not 0 */
L0192        tag_error(L, narg, LUA_TNUMBER);
L0193      return d;
L0194    }
L0195    
L0196    
L0197    LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
manc:luaL_optinteger
L0198                                                          lua_Integer def) {
L0199      return luaL_opt(L, luaL_checkinteger, narg, def);
L0200    }
L0201    
L0202    
L0203    LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
manc:luaL_getmetafield
L0204      if (!lua_getmetatable(L, obj))  /* no metatable? */
L0205        return 0;
L0206      lua_pushstring(L, event);
L0207      lua_rawget(L, -2);
L0208      if (lua_isnil(L, -1)) {
L0209        lua_pop(L, 2);  /* remove metatable and metafield */
L0210        return 0;
L0211      }
L0212      else {
L0213        lua_remove(L, -2);  /* remove only metatable */
L0214        return 1;
L0215      }
L0216    }
L0217    
L0218    
L0219    LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
manc:luaL_callmeta
L0220      obj = abs_index(L, obj);
L0221      if (!luaL_getmetafield(L, obj, event))  /* no metafield? */
L0222        return 0;
L0223      lua_pushvalue(L, obj);
L0224      lua_call(L, 1, 1);
L0225      return 1;
L0226    }
L0227    
L0228    
L0229    LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
manc:luaL_register
L0230                                    const luaL_Reg *l) {
L0231      luaI_openlib(L, libname, l, 0);
L0232    }
L0233    
L0234    
L0235    static int libsize (const luaL_Reg *l) {
L0236      int size = 0;
L0237      for (; l->name; l++) size++;
L0238      return size;
L0239    }
L0240    
L0241    
L0242    LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
L0243                                  const luaL_Reg *l, int nup) {
L0244      if (libname) {
L0245        int size = libsize(l);
L0246        /* check whether lib already exists */
L0247        luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
L0248        lua_getfield(L, -1, libname);  /* get _LOADED[libname] */
L0249        if (!lua_istable(L, -1)) {  /* not found? */
L0250          lua_pop(L, 1);  /* remove previous result */
L0251          /* try global variable (and create one if it does not exist) */
L0252          if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
L0253            luaL_error(L, "name conflict for module " LUA_QS, libname);
L0254          lua_pushvalue(L, -1);
L0255          lua_setfield(L, -3, libname);  /* _LOADED[libname] = new table */
L0256        }
L0257        lua_remove(L, -2);  /* remove _LOADED table */
L0258        lua_insert(L, -(nup+1));  /* move library table to below upvalues */
L0259      }
L0260      for (; l->name; l++) {
L0261        int i;
L0262        for (i=0; i<nup; i++)  /* copy upvalues to the top */
L0263          lua_pushvalue(L, -nup);
L0264        lua_pushcclosure(L, l->func, nup);
L0265        lua_setfield(L, -(nup+2), l->name);
L0266      }
L0267      lua_pop(L, nup);  /* remove upvalues */
L0268    }
L0269    
L0270    
L0271    
L0272    /*
L0273    ** {======================================================
L0274    ** getn-setn: size for arrays
L0275    ** =======================================================
L0276    */
L0277    
L0278    #if defined(LUA_COMPAT_GETN)
L0279    
L0280    static int checkint (lua_State *L, int topop) {
L0281      int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
L0282      lua_pop(L, topop);
L0283      return n;
L0284    }
L0285    
L0286    
L0287    static void getsizes (lua_State *L) {
L0288      lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
L0289      if (lua_isnil(L, -1)) {  /* no `size' table? */
L0290        lua_pop(L, 1);  /* remove nil */
L0291        lua_newtable(L);  /* create it */
L0292        lua_pushvalue(L, -1);  /* `size' will be its own metatable */
L0293        lua_setmetatable(L, -2);
L0294        lua_pushliteral(L, "kv");
L0295        lua_setfield(L, -2, "__mode");  /* metatable(N).__mode = "kv" */
L0296        lua_pushvalue(L, -1);
L0297        lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");  /* store in register */
L0298      }
L0299    }
L0300    
L0301    
L0302    LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
manc:luaL_setn
L0303      t = abs_index(L, t);
L0304      lua_pushliteral(L, "n");
L0305      lua_rawget(L, t);
L0306      if (checkint(L, 1) >= 0) {  /* is there a numeric field `n'? */
L0307        lua_pushliteral(L, "n");  /* use it */
L0308        lua_pushinteger(L, n);
L0309        lua_rawset(L, t);
L0310      }
L0311      else {  /* use `sizes' */
L0312        getsizes(L);
L0313        lua_pushvalue(L, t);
L0314        lua_pushinteger(L, n);
L0315        lua_rawset(L, -3);  /* sizes[t] = n */
L0316        lua_pop(L, 1);  /* remove `sizes' */
L0317      }
L0318    }
L0319    
L0320    
L0321    LUALIB_API int luaL_getn (lua_State *L, int t) {
manc:luaL_getn
L0322      int n;
L0323      t = abs_index(L, t);
L0324      lua_pushliteral(L, "n");  /* try t.n */
L0325      lua_rawget(L, t);
L0326      if ((n = checkint(L, 1)) >= 0) return n;
L0327      getsizes(L);  /* else try sizes[t] */
L0328      lua_pushvalue(L, t);
L0329      lua_rawget(L, -2);
L0330      if ((n = checkint(L, 2)) >= 0) return n;
L0331      return (int)lua_objlen(L, t);
L0332    }
L0333    
L0334    #endif
L0335    
L0336    /* }====================================================== */
L0337    
L0338    
L0339    
L0340    LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
manc:luaL_gsub
L0341                                                                   const char *r) {
L0342      const char *wild;
L0343      size_t l = strlen(p);
L0344      luaL_Buffer b;
L0345      luaL_buffinit(L, &b);
L0346      while ((wild = strstr(s, p)) != NULL) {
L0347        luaL_addlstring(&b, s, wild - s);  /* push prefix */
L0348        luaL_addstring(&b, r);  /* push replacement in place of pattern */
L0349        s = wild + l;  /* continue after `p' */
L0350      }
L0351      luaL_addstring(&b, s);  /* push last suffix */
L0352      luaL_pushresult(&b);
L0353      return lua_tostring(L, -1);
L0354    }
L0355    
L0356    
L0357    LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
manc:luaL_findtable
L0358                                           const char *fname, int szhint) {
L0359      const char *e;
L0360      lua_pushvalue(L, idx);
L0361      do {
L0362        e = strchr(fname, '.');
L0363        if (e == NULL) e = fname + strlen(fname);
L0364        lua_pushlstring(L, fname, e - fname);
L0365        lua_rawget(L, -2);
L0366        if (lua_isnil(L, -1)) {  /* no such field? */
L0367          lua_pop(L, 1);  /* remove this nil */
L0368          lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
L0369          lua_pushlstring(L, fname, e - fname);
L0370          lua_pushvalue(L, -2);
L0371          lua_settable(L, -4);  /* set new table into field */
L0372        }
L0373        else if (!lua_istable(L, -1)) {  /* field has a non-table value? */
L0374          lua_pop(L, 2);  /* remove table and value */
L0375          return fname;  /* return problematic part of the name */
L0376        }
L0377        lua_remove(L, -2);  /* remove previous table */
L0378        fname = e + 1;
L0379      } while (*e == '.');
L0380      return NULL;
L0381    }
L0382    
L0383    
L0384    
L0385    /*
L0386    ** {======================================================
L0387    ** Generic Buffer manipulation
L0388    ** =======================================================
L0389    */
L0390    
L0391    
L0392    #define bufflen(B)	((B)->p - (B)->buffer)
L0393    #define bufffree(B)	((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
L0394    
L0395    #define LIMIT	(LUA_MINSTACK/2)
L0396    
L0397    
L0398    static int emptybuffer (luaL_Buffer *B) {
L0399      size_t l = bufflen(B);
L0400      if (l == 0) return 0;  /* put nothing on stack */
L0401      else {
L0402        lua_pushlstring(B->L, B->buffer, l);
L0403        B->p = B->buffer;
L0404        B->lvl++;
L0405        return 1;
L0406      }
L0407    }
L0408    
L0409    
L0410    static void adjuststack (luaL_Buffer *B) {
L0411      if (B->lvl > 1) {
L0412        lua_State *L = B->L;
L0413        int toget = 1;  /* number of levels to concat */
L0414        size_t toplen = lua_strlen(L, -1);
L0415        do {
L0416          size_t l = lua_strlen(L, -(toget+1));
L0417          if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
L0418            toplen += l;
L0419            toget++;
L0420          }
L0421          else break;
L0422        } while (toget < B->lvl);
L0423        lua_concat(L, toget);
L0424        B->lvl = B->lvl - toget + 1;
L0425      }
L0426    }
L0427    
L0428    
L0429    LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
L0430      if (emptybuffer(B))
L0431        adjuststack(B);
L0432      return B->buffer;
L0433    }
L0434    
L0435    
L0436    LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
L0437      while (l--)
L0438        luaL_addchar(B, *s++);
L0439    }
L0440    
L0441    
L0442    LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
L0443      luaL_addlstring(B, s, strlen(s));
L0444    }
L0445    
L0446    
L0447    LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
L0448      emptybuffer(B);
L0449      lua_concat(B->L, B->lvl);
L0450      B->lvl = 1;
L0451    }
L0452    
L0453    
L0454    LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
L0455      lua_State *L = B->L;
L0456      size_t vl;
L0457      const char *s = lua_tolstring(L, -1, &vl);
L0458      if (vl <= bufffree(B)) {  /* fit into buffer? */
L0459        memcpy(B->p, s, vl);  /* put it there */
L0460        B->p += vl;
L0461        lua_pop(L, 1);  /* remove from stack */
L0462      }
L0463      else {
L0464        if (emptybuffer(B))
L0465          lua_insert(L, -2);  /* put buffer before new value */
L0466        B->lvl++;  /* add new value into B stack */
L0467        adjuststack(B);
L0468      }
L0469    }
L0470    
L0471    
L0472    LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
manc:luaL_buffinit
L0473      B->L = L;
L0474      B->p = B->buffer;
L0475      B->lvl = 0;
L0476    }
L0477    
L0478    /* }====================================================== */
L0479    
L0480    
L0481    LUALIB_API int luaL_ref (lua_State *L, int t) {
manc:luaL_ref
L0482      int ref;
L0483      t = abs_index(L, t);
L0484      if (lua_isnil(L, -1)) {
L0485        lua_pop(L, 1);  /* remove from stack */
L0486        return LUA_REFNIL;  /* `nil' has a unique fixed reference */
L0487      }
L0488      lua_rawgeti(L, t, FREELIST_REF);  /* get first free element */
L0489      ref = (int)lua_tointeger(L, -1);  /* ref = t[FREELIST_REF] */
L0490      lua_pop(L, 1);  /* remove it from stack */
L0491      if (ref != 0) {  /* any free element? */
L0492        lua_rawgeti(L, t, ref);  /* remove it from list */
L0493        lua_rawseti(L, t, FREELIST_REF);  /* (t[FREELIST_REF] = t[ref]) */
L0494      }
L0495      else {  /* no free elements */
L0496        ref = (int)lua_objlen(L, t);
L0497        ref++;  /* create new reference */
L0498      }
L0499      lua_rawseti(L, t, ref);
L0500      return ref;
L0501    }
L0502    
L0503    
L0504    LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
manc:luaL_unref
L0505      if (ref >= 0) {
L0506        t = abs_index(L, t);
L0507        lua_rawgeti(L, t, FREELIST_REF);
L0508        lua_rawseti(L, t, ref);  /* t[ref] = t[FREELIST_REF] */
L0509        lua_pushinteger(L, ref);
L0510        lua_rawseti(L, t, FREELIST_REF);  /* t[FREELIST_REF] = ref */
L0511      }
L0512    }
L0513    
L0514    
L0515    
L0516    /*
L0517    ** {======================================================
L0518    ** Load functions
L0519    ** =======================================================
L0520    */
L0521    
L0522    typedef struct LoadF {
L0523      int extraline;
L0524      FILE *f;
L0525      char buff[LUAL_BUFFERSIZE];
L0526    } LoadF;
L0527    
L0528    
L0529    static const char *getF (lua_State *L, void *ud, size_t *size) {
L0530      LoadF *lf = (LoadF *)ud;
L0531      (void)L;
L0532      if (lf->extraline) {
L0533        lf->extraline = 0;
L0534        *size = 1;
L0535        return "\n";
L0536      }
L0537      if (feof(lf->f)) return NULL;
L0538      *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f);
L0539      return (*size > 0) ? lf->buff : NULL;
L0540    }
L0541    
L0542    
L0543    static int errfile (lua_State *L, const char *what, int fnameindex) {
L0544      const char *serr = strerror(errno);
L0545      const char *filename = lua_tostring(L, fnameindex) + 1;
L0546      lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
L0547      lua_remove(L, fnameindex);
L0548      return LUA_ERRFILE;
L0549    }
L0550    
L0551    
L0552    LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
manc:luaL_loadfile
L0553      LoadF lf;
L0554      int status, readstatus;
L0555      int c;
L0556      int fnameindex = lua_gettop(L) + 1;  /* index of filename on the stack */
L0557      lf.extraline = 0;
L0558      if (filename == NULL) {
L0559        lua_pushliteral(L, "=stdin");
L0560        lf.f = stdin;
L0561      }
L0562      else {
L0563        lua_pushfstring(L, "@%s", filename);
L0564        lf.f = fopen(filename, "r");
L0565        if (lf.f == NULL) return errfile(L, "open", fnameindex);
L0566      }
L0567      c = getc(lf.f);
L0568      if (c == '#') {  /* Unix exec. file? */
L0569        lf.extraline = 1;
L0570        while ((c = getc(lf.f)) != EOF && c != '\n') ;  /* skip first line */
L0571        if (c == '\n') c = getc(lf.f);
L0572      }
L0573      if (c == LUA_SIGNATURE[0] && filename) {  /* binary file? */
L0574        lf.f = freopen(filename, "rb", lf.f);  /* reopen in binary mode */
L0575        if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
L0576        /* skip eventual `#!...' */
L0577       while ((c = getc(lf.f)) != EOF && c != LUA_SIGNATURE[0]) ;
L0578        lf.extraline = 0;
L0579      }
L0580      ungetc(c, lf.f);
L0581      status = lua_load(L, getF, &lf, lua_tostring(L, -1));
L0582      readstatus = ferror(lf.f);
L0583      if (filename) fclose(lf.f);  /* close file (even in case of errors) */
L0584      if (readstatus) {
L0585        lua_settop(L, fnameindex);  /* ignore results from `lua_load' */
L0586        return errfile(L, "read", fnameindex);
L0587      }
L0588      lua_remove(L, fnameindex);
L0589      return status;
L0590    }
L0591    
L0592    
L0593    typedef struct LoadS {
L0594      const char *s;
L0595      size_t size;
L0596    } LoadS;
L0597    
L0598    
L0599    static const char *getS (lua_State *L, void *ud, size_t *size) {
L0600      LoadS *ls = (LoadS *)ud;
L0601      (void)L;
L0602      if (ls->size == 0) return NULL;
L0603      *size = ls->size;
L0604      ls->size = 0;
L0605      return ls->s;
L0606    }
L0607    
L0608    
L0609    LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
manc:luaL_loadbuffer
L0610                                    const char *name) {
L0611      LoadS ls;
L0612      ls.s = buff;
L0613      ls.size = size;
L0614      return lua_load(L, getS, &ls, name);
L0615    }
L0616    
L0617    
L0618    LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
manc:luaL_loadstring
L0619      return luaL_loadbuffer(L, s, strlen(s), s);
L0620    }
L0621    
L0622    
L0623    
L0624    /* }====================================================== */
L0625    
L0626    
L0627    static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
L0628      (void)ud;
L0629      (void)osize;
L0630      if (nsize == 0) {
L0631        free(ptr);
L0632        return NULL;
L0633      }
L0634      else
L0635        return realloc(ptr, nsize);
L0636    }
L0637    
L0638    
L0639    static int panic (lua_State *L) {
L0640      (void)L;  /* to avoid warnings */
L0641      fprintf(stderr, "PANIC: unprotected error in call to Lua API (%s)\n",
L0642                       lua_tostring(L, -1));
L0643      return 0;
L0644    }
L0645    
L0646    
L0647    LUALIB_API lua_State *luaL_newstate (void) {
manc:luaL_newstate
L0648      lua_State *L = lua_newstate(l_alloc, NULL);
L0649      if (L) lua_atpanic(L, &panic);
L0650      return L;
L0651    }
L0652