0,0 → 1,957 |
/* |
** $Id: lauxlib.c,v 1.240 2011/12/06 16:33:55 roberto Exp $ |
** Auxiliary functions for building Lua libraries |
** See Copyright Notice in lua.h |
*/ |
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#include <errno.h> |
#include <stdarg.h> |
#include <stdio.h> |
#include <stdlib.h> |
#include <string.h> |
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/* This file uses only the official API of Lua. |
** Any function declared here could be written as an application function. |
*/ |
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#define lauxlib_c |
#define LUA_LIB |
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#include "lua.h" |
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#include "lauxlib.h" |
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/* |
** {====================================================== |
** Traceback |
** ======================================================= |
*/ |
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#define LEVELS1 12 /* size of the first part of the stack */ |
#define LEVELS2 10 /* size of the second part of the stack */ |
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/* |
** search for 'objidx' in table at index -1. |
** return 1 + string at top if find a good name. |
*/ |
static int findfield (lua_State *L, int objidx, int level) { |
if (level == 0 || !lua_istable(L, -1)) |
return 0; /* not found */ |
lua_pushnil(L); /* start 'next' loop */ |
while (lua_next(L, -2)) { /* for each pair in table */ |
if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */ |
if (lua_rawequal(L, objidx, -1)) { /* found object? */ |
lua_pop(L, 1); /* remove value (but keep name) */ |
return 1; |
} |
else if (findfield(L, objidx, level - 1)) { /* try recursively */ |
lua_remove(L, -2); /* remove table (but keep name) */ |
lua_pushliteral(L, "."); |
lua_insert(L, -2); /* place '.' between the two names */ |
lua_concat(L, 3); |
return 1; |
} |
} |
lua_pop(L, 1); /* remove value */ |
} |
return 0; /* not found */ |
} |
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static int pushglobalfuncname (lua_State *L, lua_Debug *ar) { |
int top = lua_gettop(L); |
lua_getinfo(L, "f", ar); /* push function */ |
lua_pushglobaltable(L); |
if (findfield(L, top + 1, 2)) { |
lua_copy(L, -1, top + 1); /* move name to proper place */ |
lua_pop(L, 2); /* remove pushed values */ |
return 1; |
} |
else { |
lua_settop(L, top); /* remove function and global table */ |
return 0; |
} |
} |
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static void pushfuncname (lua_State *L, lua_Debug *ar) { |
if (*ar->namewhat != '\0') /* is there a name? */ |
lua_pushfstring(L, "function " LUA_QS, ar->name); |
else if (*ar->what == 'm') /* main? */ |
lua_pushfstring(L, "main chunk"); |
else if (*ar->what == 'C') { |
if (pushglobalfuncname(L, ar)) { |
lua_pushfstring(L, "function " LUA_QS, lua_tostring(L, -1)); |
lua_remove(L, -2); /* remove name */ |
} |
else |
lua_pushliteral(L, "?"); |
} |
else |
lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined); |
} |
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static int countlevels (lua_State *L) { |
lua_Debug ar; |
int li = 1, le = 1; |
/* find an upper bound */ |
while (lua_getstack(L, le, &ar)) { li = le; le *= 2; } |
/* do a binary search */ |
while (li < le) { |
int m = (li + le)/2; |
if (lua_getstack(L, m, &ar)) li = m + 1; |
else le = m; |
} |
return le - 1; |
} |
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LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1, |
const char *msg, int level) { |
lua_Debug ar; |
int top = lua_gettop(L); |
int numlevels = countlevels(L1); |
int mark = (numlevels > LEVELS1 + LEVELS2) ? LEVELS1 : 0; |
if (msg) lua_pushfstring(L, "%s\n", msg); |
lua_pushliteral(L, "stack traceback:"); |
while (lua_getstack(L1, level++, &ar)) { |
if (level == mark) { /* too many levels? */ |
lua_pushliteral(L, "\n\t..."); /* add a '...' */ |
level = numlevels - LEVELS2; /* and skip to last ones */ |
} |
else { |
lua_getinfo(L1, "Slnt", &ar); |
lua_pushfstring(L, "\n\t%s:", ar.short_src); |
if (ar.currentline > 0) |
lua_pushfstring(L, "%d:", ar.currentline); |
lua_pushliteral(L, " in "); |
pushfuncname(L, &ar); |
if (ar.istailcall) |
lua_pushliteral(L, "\n\t(...tail calls...)"); |
lua_concat(L, lua_gettop(L) - top); |
} |
} |
lua_concat(L, lua_gettop(L) - top); |
} |
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/* }====================================================== */ |
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/* |
** {====================================================== |
** Error-report functions |
** ======================================================= |
*/ |
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LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) { |
lua_Debug ar; |
if (!lua_getstack(L, 0, &ar)) /* no stack frame? */ |
return luaL_error(L, "bad argument #%d (%s)", narg, extramsg); |
lua_getinfo(L, "n", &ar); |
if (strcmp(ar.namewhat, "method") == 0) { |
narg--; /* do not count `self' */ |
if (narg == 0) /* error is in the self argument itself? */ |
return luaL_error(L, "calling " LUA_QS " on bad self", ar.name); |
} |
if (ar.name == NULL) |
ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?"; |
return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)", |
narg, ar.name, extramsg); |
} |
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static int typeerror (lua_State *L, int narg, const char *tname) { |
const char *msg = lua_pushfstring(L, "%s expected, got %s", |
tname, luaL_typename(L, narg)); |
return luaL_argerror(L, narg, msg); |
} |
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static void tag_error (lua_State *L, int narg, int tag) { |
typeerror(L, narg, lua_typename(L, tag)); |
} |
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LUALIB_API void luaL_where (lua_State *L, int level) { |
lua_Debug ar; |
if (lua_getstack(L, level, &ar)) { /* check function at level */ |
lua_getinfo(L, "Sl", &ar); /* get info about it */ |
if (ar.currentline > 0) { /* is there info? */ |
lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline); |
return; |
} |
} |
lua_pushliteral(L, ""); /* else, no information available... */ |
} |
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LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) { |
va_list argp; |
va_start(argp, fmt); |
luaL_where(L, 1); |
lua_pushvfstring(L, fmt, argp); |
va_end(argp); |
lua_concat(L, 2); |
return lua_error(L); |
} |
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LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) { |
int en = errno; /* calls to Lua API may change this value */ |
if (stat) { |
lua_pushboolean(L, 1); |
return 1; |
} |
else { |
lua_pushnil(L); |
if (fname) |
lua_pushfstring(L, "%s: %s", fname, strerror(en)); |
else |
lua_pushfstring(L, "%s", strerror(en)); |
lua_pushinteger(L, en); |
return 3; |
} |
} |
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#if !defined(inspectstat) /* { */ |
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#if defined(LUA_USE_POSIX) |
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#include <sys/wait.h> |
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/* |
** use appropriate macros to interpret 'pclose' return status |
*/ |
#define inspectstat(stat,what) \ |
if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \ |
else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; } |
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#else |
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#define inspectstat(stat,what) /* no op */ |
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#endif |
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#endif /* } */ |
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LUALIB_API int luaL_execresult (lua_State *L, int stat) { |
const char *what = "exit"; /* type of termination */ |
if (stat == -1) /* error? */ |
return luaL_fileresult(L, 0, NULL); |
else { |
inspectstat(stat, what); /* interpret result */ |
if (*what == 'e' && stat == 0) /* successful termination? */ |
lua_pushboolean(L, 1); |
else |
lua_pushnil(L); |
lua_pushstring(L, what); |
lua_pushinteger(L, stat); |
return 3; /* return true/nil,what,code */ |
} |
} |
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/* }====================================================== */ |
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/* |
** {====================================================== |
** Userdata's metatable manipulation |
** ======================================================= |
*/ |
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LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) { |
luaL_getmetatable(L, tname); /* try to get metatable */ |
if (!lua_isnil(L, -1)) /* name already in use? */ |
return 0; /* leave previous value on top, but return 0 */ |
lua_pop(L, 1); |
lua_newtable(L); /* create metatable */ |
lua_pushvalue(L, -1); |
lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */ |
return 1; |
} |
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LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) { |
luaL_getmetatable(L, tname); |
lua_setmetatable(L, -2); |
} |
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LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) { |
void *p = lua_touserdata(L, ud); |
if (p != NULL) { /* value is a userdata? */ |
if (lua_getmetatable(L, ud)) { /* does it have a metatable? */ |
luaL_getmetatable(L, tname); /* get correct metatable */ |
if (!lua_rawequal(L, -1, -2)) /* not the same? */ |
p = NULL; /* value is a userdata with wrong metatable */ |
lua_pop(L, 2); /* remove both metatables */ |
return p; |
} |
} |
return NULL; /* value is not a userdata with a metatable */ |
} |
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LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) { |
void *p = luaL_testudata(L, ud, tname); |
if (p == NULL) typeerror(L, ud, tname); |
return p; |
} |
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/* }====================================================== */ |
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/* |
** {====================================================== |
** Argument check functions |
** ======================================================= |
*/ |
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LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def, |
const char *const lst[]) { |
const char *name = (def) ? luaL_optstring(L, narg, def) : |
luaL_checkstring(L, narg); |
int i; |
for (i=0; lst[i]; i++) |
if (strcmp(lst[i], name) == 0) |
return i; |
return luaL_argerror(L, narg, |
lua_pushfstring(L, "invalid option " LUA_QS, name)); |
} |
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LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) { |
/* keep some extra space to run error routines, if needed */ |
const int extra = LUA_MINSTACK; |
if (!lua_checkstack(L, space + extra)) { |
if (msg) |
luaL_error(L, "stack overflow (%s)", msg); |
else |
luaL_error(L, "stack overflow"); |
} |
} |
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LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) { |
if (lua_type(L, narg) != t) |
tag_error(L, narg, t); |
} |
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LUALIB_API void luaL_checkany (lua_State *L, int narg) { |
if (lua_type(L, narg) == LUA_TNONE) |
luaL_argerror(L, narg, "value expected"); |
} |
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LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) { |
const char *s = lua_tolstring(L, narg, len); |
if (!s) tag_error(L, narg, LUA_TSTRING); |
return s; |
} |
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LUALIB_API const char *luaL_optlstring (lua_State *L, int narg, |
const char *def, size_t *len) { |
if (lua_isnoneornil(L, narg)) { |
if (len) |
*len = (def ? strlen(def) : 0); |
return def; |
} |
else return luaL_checklstring(L, narg, len); |
} |
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LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) { |
int isnum; |
lua_Number d = lua_tonumberx(L, narg, &isnum); |
if (!isnum) |
tag_error(L, narg, LUA_TNUMBER); |
return d; |
} |
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LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) { |
return luaL_opt(L, luaL_checknumber, narg, def); |
} |
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LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) { |
int isnum; |
lua_Integer d = lua_tointegerx(L, narg, &isnum); |
if (!isnum) |
tag_error(L, narg, LUA_TNUMBER); |
return d; |
} |
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LUALIB_API lua_Unsigned luaL_checkunsigned (lua_State *L, int narg) { |
int isnum; |
lua_Unsigned d = lua_tounsignedx(L, narg, &isnum); |
if (!isnum) |
tag_error(L, narg, LUA_TNUMBER); |
return d; |
} |
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LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg, |
lua_Integer def) { |
return luaL_opt(L, luaL_checkinteger, narg, def); |
} |
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LUALIB_API lua_Unsigned luaL_optunsigned (lua_State *L, int narg, |
lua_Unsigned def) { |
return luaL_opt(L, luaL_checkunsigned, narg, def); |
} |
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/* }====================================================== */ |
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/* |
** {====================================================== |
** Generic Buffer manipulation |
** ======================================================= |
*/ |
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/* |
** check whether buffer is using a userdata on the stack as a temporary |
** buffer |
*/ |
#define buffonstack(B) ((B)->b != (B)->initb) |
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/* |
** returns a pointer to a free area with at least 'sz' bytes |
*/ |
LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) { |
lua_State *L = B->L; |
if (B->size - B->n < sz) { /* not enough space? */ |
char *newbuff; |
size_t newsize = B->size * 2; /* double buffer size */ |
if (newsize - B->n < sz) /* not bit enough? */ |
newsize = B->n + sz; |
if (newsize < B->n || newsize - B->n < sz) |
luaL_error(L, "buffer too large"); |
/* create larger buffer */ |
newbuff = (char *)lua_newuserdata(L, newsize * sizeof(char)); |
/* move content to new buffer */ |
memcpy(newbuff, B->b, B->n * sizeof(char)); |
if (buffonstack(B)) |
lua_remove(L, -2); /* remove old buffer */ |
B->b = newbuff; |
B->size = newsize; |
} |
return &B->b[B->n]; |
} |
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LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) { |
char *b = luaL_prepbuffsize(B, l); |
memcpy(b, s, l * sizeof(char)); |
luaL_addsize(B, l); |
} |
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LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) { |
luaL_addlstring(B, s, strlen(s)); |
} |
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LUALIB_API void luaL_pushresult (luaL_Buffer *B) { |
lua_State *L = B->L; |
lua_pushlstring(L, B->b, B->n); |
if (buffonstack(B)) |
lua_remove(L, -2); /* remove old buffer */ |
} |
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LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) { |
luaL_addsize(B, sz); |
luaL_pushresult(B); |
} |
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LUALIB_API void luaL_addvalue (luaL_Buffer *B) { |
lua_State *L = B->L; |
size_t l; |
const char *s = lua_tolstring(L, -1, &l); |
if (buffonstack(B)) |
lua_insert(L, -2); /* put value below buffer */ |
luaL_addlstring(B, s, l); |
lua_remove(L, (buffonstack(B)) ? -2 : -1); /* remove value */ |
} |
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LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) { |
B->L = L; |
B->b = B->initb; |
B->n = 0; |
B->size = LUAL_BUFFERSIZE; |
} |
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LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) { |
luaL_buffinit(L, B); |
return luaL_prepbuffsize(B, sz); |
} |
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/* }====================================================== */ |
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/* |
** {====================================================== |
** Reference system |
** ======================================================= |
*/ |
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/* index of free-list header */ |
#define freelist 0 |
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LUALIB_API int luaL_ref (lua_State *L, int t) { |
int ref; |
t = lua_absindex(L, t); |
if (lua_isnil(L, -1)) { |
lua_pop(L, 1); /* remove from stack */ |
return LUA_REFNIL; /* `nil' has a unique fixed reference */ |
} |
lua_rawgeti(L, t, freelist); /* get first free element */ |
ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */ |
lua_pop(L, 1); /* remove it from stack */ |
if (ref != 0) { /* any free element? */ |
lua_rawgeti(L, t, ref); /* remove it from list */ |
lua_rawseti(L, t, freelist); /* (t[freelist] = t[ref]) */ |
} |
else /* no free elements */ |
ref = (int)lua_rawlen(L, t) + 1; /* get a new reference */ |
lua_rawseti(L, t, ref); |
return ref; |
} |
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LUALIB_API void luaL_unref (lua_State *L, int t, int ref) { |
if (ref >= 0) { |
t = lua_absindex(L, t); |
lua_rawgeti(L, t, freelist); |
lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */ |
lua_pushinteger(L, ref); |
lua_rawseti(L, t, freelist); /* t[freelist] = ref */ |
} |
} |
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/* }====================================================== */ |
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/* |
** {====================================================== |
** Load functions |
** ======================================================= |
*/ |
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typedef struct LoadF { |
int n; /* number of pre-read characters */ |
FILE *f; /* file being read */ |
char buff[LUAL_BUFFERSIZE]; /* area for reading file */ |
} LoadF; |
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static const char *getF (lua_State *L, void *ud, size_t *size) { |
LoadF *lf = (LoadF *)ud; |
(void)L; /* not used */ |
if (lf->n > 0) { /* are there pre-read characters to be read? */ |
*size = lf->n; /* return them (chars already in buffer) */ |
lf->n = 0; /* no more pre-read characters */ |
} |
else { /* read a block from file */ |
/* 'fread' can return > 0 *and* set the EOF flag. If next call to |
'getF' called 'fread', it might still wait for user input. |
The next check avoids this problem. */ |
if (feof(lf->f)) return NULL; |
*size = fread(lf->buff, 1, sizeof(lf->buff), lf->f); /* read block */ |
} |
return lf->buff; |
} |
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static int errfile (lua_State *L, const char *what, int fnameindex) { |
const char *serr = strerror(errno); |
const char *filename = lua_tostring(L, fnameindex) + 1; |
lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr); |
lua_remove(L, fnameindex); |
return LUA_ERRFILE; |
} |
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static int skipBOM (LoadF *lf) { |
const char *p = "\xEF\xBB\xBF"; /* Utf8 BOM mark */ |
int c; |
lf->n = 0; |
do { |
c = getc(lf->f); |
if (c == EOF || c != *(unsigned char *)p++) return c; |
lf->buff[lf->n++] = c; /* to be read by the parser */ |
} while (*p != '\0'); |
lf->n = 0; /* prefix matched; discard it */ |
return getc(lf->f); /* return next character */ |
} |
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/* |
** reads the first character of file 'f' and skips an optional BOM mark |
** in its beginning plus its first line if it starts with '#'. Returns |
** true if it skipped the first line. In any case, '*cp' has the |
** first "valid" character of the file (after the optional BOM and |
** a first-line comment). |
*/ |
static int skipcomment (LoadF *lf, int *cp) { |
int c = *cp = skipBOM(lf); |
if (c == '#') { /* first line is a comment (Unix exec. file)? */ |
while ((c = getc(lf->f)) != EOF && c != '\n') ; /* skip first line */ |
*cp = getc(lf->f); /* skip end-of-line */ |
return 1; /* there was a comment */ |
} |
else return 0; /* no comment */ |
} |
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LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename, |
const char *mode) { |
LoadF lf; |
int status, readstatus; |
int c; |
int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */ |
if (filename == NULL) { |
lua_pushliteral(L, "=stdin"); |
lf.f = stdin; |
} |
else { |
lua_pushfstring(L, "@%s", filename); |
lf.f = fopen(filename, "r"); |
if (lf.f == NULL) return errfile(L, "open", fnameindex); |
} |
if (skipcomment(&lf, &c)) /* read initial portion */ |
lf.buff[lf.n++] = '\n'; /* add line to correct line numbers */ |
if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */ |
lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */ |
if (lf.f == NULL) return errfile(L, "reopen", fnameindex); |
skipcomment(&lf, &c); /* re-read initial portion */ |
} |
if (c != EOF) |
lf.buff[lf.n++] = c; /* 'c' is the first character of the stream */ |
status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode); |
readstatus = ferror(lf.f); |
if (filename) fclose(lf.f); /* close file (even in case of errors) */ |
if (readstatus) { |
lua_settop(L, fnameindex); /* ignore results from `lua_load' */ |
return errfile(L, "read", fnameindex); |
} |
lua_remove(L, fnameindex); |
return status; |
} |
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typedef struct LoadS { |
const char *s; |
size_t size; |
} LoadS; |
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static const char *getS (lua_State *L, void *ud, size_t *size) { |
LoadS *ls = (LoadS *)ud; |
(void)L; /* not used */ |
if (ls->size == 0) return NULL; |
*size = ls->size; |
ls->size = 0; |
return ls->s; |
} |
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LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size, |
const char *name, const char *mode) { |
LoadS ls; |
ls.s = buff; |
ls.size = size; |
return lua_load(L, getS, &ls, name, mode); |
} |
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LUALIB_API int luaL_loadstring (lua_State *L, const char *s) { |
return luaL_loadbuffer(L, s, strlen(s), s); |
} |
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/* }====================================================== */ |
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LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) { |
if (!lua_getmetatable(L, obj)) /* no metatable? */ |
return 0; |
lua_pushstring(L, event); |
lua_rawget(L, -2); |
if (lua_isnil(L, -1)) { |
lua_pop(L, 2); /* remove metatable and metafield */ |
return 0; |
} |
else { |
lua_remove(L, -2); /* remove only metatable */ |
return 1; |
} |
} |
|
|
LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) { |
obj = lua_absindex(L, obj); |
if (!luaL_getmetafield(L, obj, event)) /* no metafield? */ |
return 0; |
lua_pushvalue(L, obj); |
lua_call(L, 1, 1); |
return 1; |
} |
|
|
LUALIB_API int luaL_len (lua_State *L, int idx) { |
int l; |
int isnum; |
lua_len(L, idx); |
l = (int)lua_tointegerx(L, -1, &isnum); |
if (!isnum) |
luaL_error(L, "object length is not a number"); |
lua_pop(L, 1); /* remove object */ |
return l; |
} |
|
|
LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) { |
if (!luaL_callmeta(L, idx, "__tostring")) { /* no metafield? */ |
switch (lua_type(L, idx)) { |
case LUA_TNUMBER: |
case LUA_TSTRING: |
lua_pushvalue(L, idx); |
break; |
case LUA_TBOOLEAN: |
lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false")); |
break; |
case LUA_TNIL: |
lua_pushliteral(L, "nil"); |
break; |
default: |
lua_pushfstring(L, "%s: %p", luaL_typename(L, idx), |
lua_topointer(L, idx)); |
break; |
} |
} |
return lua_tolstring(L, -1, len); |
} |
|
|
/* |
** {====================================================== |
** Compatibility with 5.1 module functions |
** ======================================================= |
*/ |
#if defined(LUA_COMPAT_MODULE) |
|
static const char *luaL_findtable (lua_State *L, int idx, |
const char *fname, int szhint) { |
const char *e; |
if (idx) lua_pushvalue(L, idx); |
do { |
e = strchr(fname, '.'); |
if (e == NULL) e = fname + strlen(fname); |
lua_pushlstring(L, fname, e - fname); |
lua_rawget(L, -2); |
if (lua_isnil(L, -1)) { /* no such field? */ |
lua_pop(L, 1); /* remove this nil */ |
lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */ |
lua_pushlstring(L, fname, e - fname); |
lua_pushvalue(L, -2); |
lua_settable(L, -4); /* set new table into field */ |
} |
else if (!lua_istable(L, -1)) { /* field has a non-table value? */ |
lua_pop(L, 2); /* remove table and value */ |
return fname; /* return problematic part of the name */ |
} |
lua_remove(L, -2); /* remove previous table */ |
fname = e + 1; |
} while (*e == '.'); |
return NULL; |
} |
|
|
/* |
** Count number of elements in a luaL_Reg list. |
*/ |
static int libsize (const luaL_Reg *l) { |
int size = 0; |
for (; l && l->name; l++) size++; |
return size; |
} |
|
|
/* |
** Find or create a module table with a given name. The function |
** first looks at the _LOADED table and, if that fails, try a |
** global variable with that name. In any case, leaves on the stack |
** the module table. |
*/ |
LUALIB_API void luaL_pushmodule (lua_State *L, const char *modname, |
int sizehint) { |
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1); /* get _LOADED table */ |
lua_getfield(L, -1, modname); /* get _LOADED[modname] */ |
if (!lua_istable(L, -1)) { /* not found? */ |
lua_pop(L, 1); /* remove previous result */ |
/* try global variable (and create one if it does not exist) */ |
lua_pushglobaltable(L); |
if (luaL_findtable(L, 0, modname, sizehint) != NULL) |
luaL_error(L, "name conflict for module " LUA_QS, modname); |
lua_pushvalue(L, -1); |
lua_setfield(L, -3, modname); /* _LOADED[modname] = new table */ |
} |
lua_remove(L, -2); /* remove _LOADED table */ |
} |
|
|
LUALIB_API void luaL_openlib (lua_State *L, const char *libname, |
const luaL_Reg *l, int nup) { |
luaL_checkversion(L); |
if (libname) { |
luaL_pushmodule(L, libname, libsize(l)); /* get/create library table */ |
lua_insert(L, -(nup + 1)); /* move library table to below upvalues */ |
} |
if (l) |
luaL_setfuncs(L, l, nup); |
else |
lua_pop(L, nup); /* remove upvalues */ |
} |
|
#endif |
/* }====================================================== */ |
|
/* |
** set functions from list 'l' into table at top - 'nup'; each |
** function gets the 'nup' elements at the top as upvalues. |
** Returns with only the table at the stack. |
*/ |
LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) { |
luaL_checkstack(L, nup, "too many upvalues"); |
for (; l->name != NULL; l++) { /* fill the table with given functions */ |
int i; |
for (i = 0; i < nup; i++) /* copy upvalues to the top */ |
lua_pushvalue(L, -nup); |
lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */ |
lua_setfield(L, -(nup + 2), l->name); |
} |
lua_pop(L, nup); /* remove upvalues */ |
} |
|
|
/* |
** ensure that stack[idx][fname] has a table and push that table |
** into the stack |
*/ |
LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) { |
lua_getfield(L, idx, fname); |
if (lua_istable(L, -1)) return 1; /* table already there */ |
else { |
idx = lua_absindex(L, idx); |
lua_pop(L, 1); /* remove previous result */ |
lua_newtable(L); |
lua_pushvalue(L, -1); /* copy to be left at top */ |
lua_setfield(L, idx, fname); /* assign new table to field */ |
return 0; /* false, because did not find table there */ |
} |
} |
|
|
/* |
** stripped-down 'require'. Calls 'openf' to open a module, |
** registers the result in 'package.loaded' table and, if 'glb' |
** is true, also registers the result in the global table. |
** Leaves resulting module on the top. |
*/ |
LUALIB_API void luaL_requiref (lua_State *L, const char *modname, |
lua_CFunction openf, int glb) { |
lua_pushcfunction(L, openf); |
lua_pushstring(L, modname); /* argument to open function */ |
lua_call(L, 1, 1); /* open module */ |
luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED"); |
lua_pushvalue(L, -2); /* make copy of module (call result) */ |
lua_setfield(L, -2, modname); /* _LOADED[modname] = module */ |
lua_pop(L, 1); /* remove _LOADED table */ |
if (glb) { |
lua_pushglobaltable(L); |
lua_pushvalue(L, -2); /* copy of 'mod' */ |
lua_setfield(L, -2, modname); /* _G[modname] = module */ |
lua_pop(L, 1); /* remove _G table */ |
} |
} |
|
|
LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p, |
const char *r) { |
const char *wild; |
size_t l = strlen(p); |
luaL_Buffer b; |
luaL_buffinit(L, &b); |
while ((wild = strstr(s, p)) != NULL) { |
luaL_addlstring(&b, s, wild - s); /* push prefix */ |
luaL_addstring(&b, r); /* push replacement in place of pattern */ |
s = wild + l; /* continue after `p' */ |
} |
luaL_addstring(&b, s); /* push last suffix */ |
luaL_pushresult(&b); |
return lua_tostring(L, -1); |
} |
|
|
static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) { |
(void)ud; (void)osize; /* not used */ |
if (nsize == 0) { |
free(ptr); |
return NULL; |
} |
else |
return realloc(ptr, nsize); |
} |
|
|
static int panic (lua_State *L) { |
luai_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n", |
lua_tostring(L, -1)); |
return 0; /* return to Lua to abort */ |
} |
|
|
LUALIB_API lua_State *luaL_newstate (void) { |
lua_State *L = lua_newstate(l_alloc, NULL); |
if (L) lua_atpanic(L, &panic); |
return L; |
} |
|
|
LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver) { |
const lua_Number *v = lua_version(L); |
if (v != lua_version(NULL)) |
luaL_error(L, "multiple Lua VMs detected"); |
else if (*v != ver) |
luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f", |
ver, *v); |
/* check conversions number -> integer types */ |
lua_pushnumber(L, -(lua_Number)0x1234); |
if (lua_tointeger(L, -1) != -0x1234 || |
lua_tounsigned(L, -1) != (lua_Unsigned)-0x1234) |
luaL_error(L, "bad conversion number->int;" |
" must recompile Lua with proper settings"); |
lua_pop(L, 1); |
} |
|