768 lines
		
	
	
		
			20 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			768 lines
		
	
	
		
			20 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
| /*
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| ** $Id: liolib.c,v 2.151 2016/12/20 18:37:00 roberto Exp $
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| ** Standard I/O (and system) library
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| ** See Copyright Notice in lua.h
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| */
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| 
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| #define liolib_c
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| #define LUA_LIB
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| 
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| #include "lprefix.h"
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| 
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| #include <ctype.h>
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| #include <errno.h>
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| #include <locale.h>
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| #include <stdio.h>
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| #include <stdlib.h>
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| #include <string.h>
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| 
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| #include "lua.h"
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| #include "lauxlib.h"
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| #include "lualib.h"
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| 
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| 
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| /*
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| ** {======================================================
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| ** l_fseek: configuration for longer offsets
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| ** =======================================================
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| */
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| 
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| #if !defined(l_fseek)		/* { */
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| 
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| #if defined(LUA_USE_POSIX)	/* { */
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| 
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| #include <sys/types.h>
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| 
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| #define l_fseek(f,o,w)		fseeko(f,o,w)
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| #define l_ftell(f)		ftello(f)
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| #define l_seeknum		off_t
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| 
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| #elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \
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|    && defined(_MSC_VER) && (_MSC_VER >= 1400)	/* }{ */
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| 
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| /* Windows (but not DDK) and Visual C++ 2005 or higher */
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| #define l_fseek(f,o,w)		_fseeki64(f,o,w)
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| #define l_ftell(f)		_ftelli64(f)
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| #define l_seeknum		__int64
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| 
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| #else				/* }{ */
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| 
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| /* ISO C definitions */
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| #define l_fseek(f,o,w)		fseek(f,o,w)
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| #define l_ftell(f)		ftell(f)
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| #define l_seeknum		long
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| 
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| #endif				/* } */
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| 
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| #endif				/* } */
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| 
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| /* }====================================================== */
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| 
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| 
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| namespace NS_SLUA {
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| /*
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| ** Change this macro to accept other modes for 'fopen' besides
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| ** the standard ones.
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| */
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| #if !defined(l_checkmode)
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| 
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| /* accepted extensions to 'mode' in 'fopen' */
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| #if !defined(L_MODEEXT)
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| #define L_MODEEXT	"b"
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| #endif
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| 
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| /* Check whether 'mode' matches '[rwa]%+?[L_MODEEXT]*' */
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| static int l_checkmode (const char *mode) {
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|   return (*mode != '\0' && strchr("rwa", *(mode++)) != NULL &&
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|          (*mode != '+' || (++mode, 1)) &&  /* skip if char is '+' */
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|          (strspn(mode, L_MODEEXT) == strlen(mode)));  /* check extensions */
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| }
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| 
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| #endif
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| 
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| /*
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| ** {======================================================
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| ** l_popen spawns a new process connected to the current
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| ** one through the file streams.
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| ** =======================================================
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| */
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| 
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| #if !defined(l_popen)		/* { */
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| 
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| #if defined(LUA_USE_POSIX)	/* { */
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| 
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| #define l_popen(L,c,m)		(fflush(NULL), popen(c,m))
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| #define l_pclose(L,file)	(pclose(file))
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| 
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| #elif defined(LUA_USE_WINDOWS)	/* }{ */
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| 
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| #define l_popen(L,c,m)		(_popen(c,m))
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| #define l_pclose(L,file)	(_pclose(file))
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| 
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| #else				/* }{ */
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| 
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| /* ISO C definitions */
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| #define l_popen(L,c,m)  \
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| 	  ((void)((void)c, m), \
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| 	  luaL_error(L, "'popen' not supported"), \
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| 	  (FILE*)0)
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| #define l_pclose(L,file)		((void)L, (void)file, -1)
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| 
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| #endif				/* } */
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| 
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| #endif				/* } */
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| 
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| /* }====================================================== */
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| 
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| 
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| #if !defined(l_getc)		/* { */
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| 
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| #if defined(LUA_USE_POSIX)
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| #define l_getc(f)		getc_unlocked(f)
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| #define l_lockfile(f)		flockfile(f)
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| #define l_unlockfile(f)		funlockfile(f)
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| #else
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| #define l_getc(f)		getc(f)
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| #define l_lockfile(f)		((void)0)
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| #define l_unlockfile(f)		((void)0)
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| #endif
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| 
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| #endif				/* } */
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| 
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| #define IO_PREFIX	"_IO_"
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| #define IOPREF_LEN	(sizeof(IO_PREFIX)/sizeof(char) - 1)
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| #define IO_INPUT	(IO_PREFIX "input")
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| #define IO_OUTPUT	(IO_PREFIX "output")
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| 
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| 
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| typedef luaL_Stream LStream;
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| 
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| 
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| #define tolstream(L)	((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
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| 
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| #define isclosed(p)	((p)->closef == NULL)
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| 
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| 
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| static int io_type (lua_State *L) {
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|   LStream *p;
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|   luaL_checkany(L, 1);
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|   p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
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|   if (p == NULL)
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|     lua_pushnil(L);  /* not a file */
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|   else if (isclosed(p))
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|     lua_pushliteral(L, "closed file");
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|   else
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|     lua_pushliteral(L, "file");
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|   return 1;
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| }
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| 
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| 
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| static int f_tostring (lua_State *L) {
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|   LStream *p = tolstream(L);
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|   if (isclosed(p))
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|     lua_pushliteral(L, "file (closed)");
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|   else
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|     lua_pushfstring(L, "file (%p)", p->f);
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|   return 1;
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| }
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| 
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| 
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| static FILE *tofile (lua_State *L) {
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|   LStream *p = tolstream(L);
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|   if (isclosed(p))
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|     luaL_error(L, "attempt to use a closed file");
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|   lua_assert(p->f);
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|   return p->f;
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| }
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| 
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| 
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| /*
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| ** When creating file handles, always creates a 'closed' file handle
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| ** before opening the actual file; so, if there is a memory error, the
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| ** handle is in a consistent state.
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| */
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| static LStream *newprefile (lua_State *L) {
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|   LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
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|   p->closef = NULL;  /* mark file handle as 'closed' */
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|   luaL_setmetatable(L, LUA_FILEHANDLE);
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|   return p;
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| }
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| 
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| 
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| /*
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| ** Calls the 'close' function from a file handle. The 'volatile' avoids
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| ** a bug in some versions of the Clang compiler (e.g., clang 3.0 for
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| ** 32 bits).
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| */
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| static int aux_close (lua_State *L) {
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|   LStream *p = tolstream(L);
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|   volatile lua_CFunction cf = p->closef;
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|   p->closef = NULL;  /* mark stream as closed */
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|   return (*cf)(L);  /* close it */
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| }
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| 
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| 
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| static int io_close (lua_State *L) {
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|   if (lua_isnone(L, 1))  /* no argument? */
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|     lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT);  /* use standard output */
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|   tofile(L);  /* make sure argument is an open stream */
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|   return aux_close(L);
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| }
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| 
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| 
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| static int f_gc (lua_State *L) {
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|   LStream *p = tolstream(L);
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|   if (!isclosed(p) && p->f != NULL)
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|     aux_close(L);  /* ignore closed and incompletely open files */
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|   return 0;
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| }
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| 
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| 
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| /*
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| ** function to close regular files
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| */
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| static int io_fclose (lua_State *L) {
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|   LStream *p = tolstream(L);
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|   int res = fclose(p->f);
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|   return luaL_fileresult(L, (res == 0), NULL);
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| }
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| 
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| 
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| static LStream *newfile (lua_State *L) {
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|   LStream *p = newprefile(L);
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|   p->f = NULL;
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|   p->closef = &io_fclose;
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|   return p;
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| }
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| 
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| 
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| static void opencheck (lua_State *L, const char *fname, const char *mode) {
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|   LStream *p = newfile(L);
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|   p->f = fopen(fname, mode);
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|   if (p->f == NULL)
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|     luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));
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| }
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| 
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| 
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| static int io_open (lua_State *L) {
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|   const char *filename = luaL_checkstring(L, 1);
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|   const char *mode = luaL_optstring(L, 2, "r");
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|   LStream *p = newfile(L);
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|   const char *md = mode;  /* to traverse/check mode */
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|   luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
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|   p->f = fopen(filename, mode);
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|   return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
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| }
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| 
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| 
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| /*
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| ** function to close 'popen' files
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| */
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| static int io_pclose (lua_State *L) {
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|   LStream *p = tolstream(L);
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|   return luaL_execresult(L, l_pclose(L, p->f));
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| }
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| 
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| 
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| static int io_popen (lua_State *L) {
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|   const char *filename = luaL_checkstring(L, 1);
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|   const char *mode = luaL_optstring(L, 2, "r");
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|   LStream *p = newprefile(L);
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|   p->f = l_popen(L, filename, mode);
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|   p->closef = &io_pclose;
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|   return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
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| }
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| 
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| 
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| static int io_tmpfile (lua_State *L) {
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|   LStream *p = newfile(L);
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|   p->f = tmpfile();
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|   return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
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| }
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| 
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| 
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| static FILE *getiofile (lua_State *L, const char *findex) {
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|   LStream *p;
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|   lua_getfield(L, LUA_REGISTRYINDEX, findex);
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|   p = (LStream *)lua_touserdata(L, -1);
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|   if (isclosed(p))
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|     luaL_error(L, "standard %s file is closed", findex + IOPREF_LEN);
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|   return p->f;
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| }
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| 
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| 
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| static int g_iofile (lua_State *L, const char *f, const char *mode) {
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|   if (!lua_isnoneornil(L, 1)) {
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|     const char *filename = lua_tostring(L, 1);
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|     if (filename)
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|       opencheck(L, filename, mode);
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|     else {
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|       tofile(L);  /* check that it's a valid file handle */
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|       lua_pushvalue(L, 1);
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|     }
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|     lua_setfield(L, LUA_REGISTRYINDEX, f);
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|   }
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|   /* return current value */
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|   lua_getfield(L, LUA_REGISTRYINDEX, f);
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|   return 1;
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| }
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| 
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| 
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| static int io_input (lua_State *L) {
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|   return g_iofile(L, IO_INPUT, "r");
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| }
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| 
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| 
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| static int io_output (lua_State *L) {
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|   return g_iofile(L, IO_OUTPUT, "w");
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| }
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| 
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| 
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| static int io_readline (lua_State *L);
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| 
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| 
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| /*
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| ** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit
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| ** in the limit for upvalues of a closure)
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| */
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| #define MAXARGLINE	250
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| 
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| static void aux_lines (lua_State *L, int toclose) {
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|   int n = lua_gettop(L) - 1;  /* number of arguments to read */
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|   luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
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|   lua_pushinteger(L, n);  /* number of arguments to read */
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|   lua_pushboolean(L, toclose);  /* close/not close file when finished */
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|   lua_rotate(L, 2, 2);  /* move 'n' and 'toclose' to their positions */
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|   lua_pushcclosure(L, io_readline, 3 + n);
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| }
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| 
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| 
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| static int f_lines (lua_State *L) {
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|   tofile(L);  /* check that it's a valid file handle */
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|   aux_lines(L, 0);
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|   return 1;
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| }
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| 
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| 
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| static int io_lines (lua_State *L) {
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|   int toclose;
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|   if (lua_isnone(L, 1)) lua_pushnil(L);  /* at least one argument */
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|   if (lua_isnil(L, 1)) {  /* no file name? */
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|     lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT);  /* get default input */
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|     lua_replace(L, 1);  /* put it at index 1 */
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|     tofile(L);  /* check that it's a valid file handle */
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|     toclose = 0;  /* do not close it after iteration */
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|   }
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|   else {  /* open a new file */
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|     const char *filename = luaL_checkstring(L, 1);
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|     opencheck(L, filename, "r");
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|     lua_replace(L, 1);  /* put file at index 1 */
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|     toclose = 1;  /* close it after iteration */
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|   }
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|   aux_lines(L, toclose);
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|   return 1;
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| }
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| 
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| 
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| /*
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| ** {======================================================
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| ** READ
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| ** =======================================================
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| */
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| 
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| 
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| /* maximum length of a numeral */
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| #if !defined (L_MAXLENNUM)
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| #define L_MAXLENNUM     200
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| #endif
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| 
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| 
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| /* auxiliary structure used by 'read_number' */
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| typedef struct {
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|   FILE *f;  /* file being read */
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|   int c;  /* current character (look ahead) */
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|   int n;  /* number of elements in buffer 'buff' */
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|   char buff[L_MAXLENNUM + 1];  /* +1 for ending '\0' */
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| } RN;
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| 
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| 
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| /*
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| ** Add current char to buffer (if not out of space) and read next one
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| */
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| static int nextc (RN *rn) {
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|   if (rn->n >= L_MAXLENNUM) {  /* buffer overflow? */
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|     rn->buff[0] = '\0';  /* invalidate result */
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|     return 0;  /* fail */
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|   }
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|   else {
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|     rn->buff[rn->n++] = rn->c;  /* save current char */
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|     rn->c = l_getc(rn->f);  /* read next one */
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|     return 1;
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|   }
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| }
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| 
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| 
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| /*
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| ** Accept current char if it is in 'set' (of size 2)
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| */
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| static int test2 (RN *rn, const char *set) {
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|   if (rn->c == set[0] || rn->c == set[1])
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|     return nextc(rn);
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|   else return 0;
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| }
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| 
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| 
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| /*
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| ** Read a sequence of (hex)digits
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| */
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| static int readdigits (RN *rn, int hex) {
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|   int count = 0;
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|   while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))
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|     count++;
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|   return count;
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| }
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| 
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| 
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| /*
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| ** Read a number: first reads a valid prefix of a numeral into a buffer.
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| ** Then it calls 'lua_stringtonumber' to check whether the format is
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| ** correct and to convert it to a Lua number
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| */
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| static int read_number (lua_State *L, FILE *f) {
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|   RN rn;
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|   int count = 0;
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|   int hex = 0;
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|   char decp[2];
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|   rn.f = f; rn.n = 0;
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|   decp[0] = lua_getlocaledecpoint();  /* get decimal point from locale */
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|   decp[1] = '.';  /* always accept a dot */
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|   l_lockfile(rn.f);
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|   do { rn.c = l_getc(rn.f); } while (isspace(rn.c));  /* skip spaces */
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|   test2(&rn, "-+");  /* optional signal */
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|   if (test2(&rn, "00")) {
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|     if (test2(&rn, "xX")) hex = 1;  /* numeral is hexadecimal */
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|     else count = 1;  /* count initial '0' as a valid digit */
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|   }
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|   count += readdigits(&rn, hex);  /* integral part */
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|   if (test2(&rn, decp))  /* decimal point? */
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|     count += readdigits(&rn, hex);  /* fractional part */
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|   if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) {  /* exponent mark? */
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|     test2(&rn, "-+");  /* exponent signal */
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|     readdigits(&rn, 0);  /* exponent digits */
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|   }
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|   ungetc(rn.c, rn.f);  /* unread look-ahead char */
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|   l_unlockfile(rn.f);
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|   rn.buff[rn.n] = '\0';  /* finish string */
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|   if (lua_stringtonumber(L, rn.buff))  /* is this a valid number? */
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|     return 1;  /* ok */
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|   else {  /* invalid format */
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|    lua_pushnil(L);  /* "result" to be removed */
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|    return 0;  /* read fails */
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|   }
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| }
 | |
| 
 | |
| 
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| static int test_eof (lua_State *L, FILE *f) {
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|   int c = getc(f);
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|   ungetc(c, f);  /* no-op when c == EOF */
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|   lua_pushliteral(L, "");
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|   return (c != EOF);
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| }
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| 
 | |
| 
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| static int read_line (lua_State *L, FILE *f, int chop) {
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|   luaL_Buffer b;
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|   int c = '\0';
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|   luaL_buffinit(L, &b);
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|   while (c != EOF && c != '\n') {  /* repeat until end of line */
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|     char *buff = luaL_prepbuffer(&b);  /* preallocate buffer */
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|     int i = 0;
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|     l_lockfile(f);  /* no memory errors can happen inside the lock */
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|     while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')
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|       buff[i++] = c;
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|     l_unlockfile(f);
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|     luaL_addsize(&b, i);
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|   }
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|   if (!chop && c == '\n')  /* want a newline and have one? */
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|     luaL_addchar(&b, c);  /* add ending newline to result */
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|   luaL_pushresult(&b);  /* close buffer */
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|   /* return ok if read something (either a newline or something else) */
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|   return (c == '\n' || lua_rawlen(L, -1) > 0);
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| }
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| 
 | |
| 
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| static void read_all (lua_State *L, FILE *f) {
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|   size_t nr;
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|   luaL_Buffer b;
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|   luaL_buffinit(L, &b);
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|   do {  /* read file in chunks of LUAL_BUFFERSIZE bytes */
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|     char *p = luaL_prepbuffer(&b);
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|     nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);
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|     luaL_addsize(&b, nr);
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|   } while (nr == LUAL_BUFFERSIZE);
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|   luaL_pushresult(&b);  /* close buffer */
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| }
 | |
| 
 | |
| 
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| static int read_chars (lua_State *L, FILE *f, size_t n) {
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|   size_t nr;  /* number of chars actually read */
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|   char *p;
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|   luaL_Buffer b;
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|   luaL_buffinit(L, &b);
 | |
|   p = luaL_prepbuffsize(&b, n);  /* prepare buffer to read whole block */
 | |
|   nr = fread(p, sizeof(char), n, f);  /* try to read 'n' chars */
 | |
|   luaL_addsize(&b, nr);
 | |
|   luaL_pushresult(&b);  /* close buffer */
 | |
|   return (nr > 0);  /* true iff read something */
 | |
| }
 | |
| 
 | |
| 
 | |
| static int g_read (lua_State *L, FILE *f, int first) {
 | |
|   int nargs = lua_gettop(L) - 1;
 | |
|   int success;
 | |
|   int n;
 | |
|   clearerr(f);
 | |
|   if (nargs == 0) {  /* no arguments? */
 | |
|     success = read_line(L, f, 1);
 | |
|     n = first+1;  /* to return 1 result */
 | |
|   }
 | |
|   else {  /* ensure stack space for all results and for auxlib's buffer */
 | |
|     luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
 | |
|     success = 1;
 | |
|     for (n = first; nargs-- && success; n++) {
 | |
|       if (lua_type(L, n) == LUA_TNUMBER) {
 | |
|         size_t l = (size_t)luaL_checkinteger(L, n);
 | |
|         success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
 | |
|       }
 | |
|       else {
 | |
|         const char *p = luaL_checkstring(L, n);
 | |
|         if (*p == '*') p++;  /* skip optional '*' (for compatibility) */
 | |
|         switch (*p) {
 | |
|           case 'n':  /* number */
 | |
|             success = read_number(L, f);
 | |
|             break;
 | |
|           case 'l':  /* line */
 | |
|             success = read_line(L, f, 1);
 | |
|             break;
 | |
|           case 'L':  /* line with end-of-line */
 | |
|             success = read_line(L, f, 0);
 | |
|             break;
 | |
|           case 'a':  /* file */
 | |
|             read_all(L, f);  /* read entire file */
 | |
|             success = 1; /* always success */
 | |
|             break;
 | |
|           default:
 | |
|             return luaL_argerror(L, n, "invalid format");
 | |
|         }
 | |
|       }
 | |
|     }
 | |
|   }
 | |
|   if (ferror(f))
 | |
|     return luaL_fileresult(L, 0, NULL);
 | |
|   if (!success) {
 | |
|     lua_pop(L, 1);  /* remove last result */
 | |
|     lua_pushnil(L);  /* push nil instead */
 | |
|   }
 | |
|   return n - first;
 | |
| }
 | |
| 
 | |
| 
 | |
| static int io_read (lua_State *L) {
 | |
|   return g_read(L, getiofile(L, IO_INPUT), 1);
 | |
| }
 | |
| 
 | |
| 
 | |
| static int f_read (lua_State *L) {
 | |
|   return g_read(L, tofile(L), 2);
 | |
| }
 | |
| 
 | |
| 
 | |
| static int io_readline (lua_State *L) {
 | |
|   LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1));
 | |
|   int i;
 | |
|   int n = (int)lua_tointeger(L, lua_upvalueindex(2));
 | |
|   if (isclosed(p))  /* file is already closed? */
 | |
|     return luaL_error(L, "file is already closed");
 | |
|   lua_settop(L , 1);
 | |
|   luaL_checkstack(L, n, "too many arguments");
 | |
|   for (i = 1; i <= n; i++)  /* push arguments to 'g_read' */
 | |
|     lua_pushvalue(L, lua_upvalueindex(3 + i));
 | |
|   n = g_read(L, p->f, 2);  /* 'n' is number of results */
 | |
|   lua_assert(n > 0);  /* should return at least a nil */
 | |
|   if (lua_toboolean(L, -n))  /* read at least one value? */
 | |
|     return n;  /* return them */
 | |
|   else {  /* first result is nil: EOF or error */
 | |
|     if (n > 1) {  /* is there error information? */
 | |
|       /* 2nd result is error message */
 | |
|       return luaL_error(L, "%s", lua_tostring(L, -n + 1));
 | |
|     }
 | |
|     if (lua_toboolean(L, lua_upvalueindex(3))) {  /* generator created file? */
 | |
|       lua_settop(L, 0);
 | |
|       lua_pushvalue(L, lua_upvalueindex(1));
 | |
|       aux_close(L);  /* close it */
 | |
|     }
 | |
|     return 0;
 | |
|   }
 | |
| }
 | |
| 
 | |
| /* }====================================================== */
 | |
| 
 | |
| 
 | |
| static int g_write (lua_State *L, FILE *f, int arg) {
 | |
|   int nargs = lua_gettop(L) - arg;
 | |
|   int status = 1;
 | |
|   for (; nargs--; arg++) {
 | |
|     if (lua_type(L, arg) == LUA_TNUMBER) {
 | |
|       /* optimization: could be done exactly as for strings */
 | |
|       int len = lua_isinteger(L, arg)
 | |
|                 ? fprintf(f, LUA_INTEGER_FMT,
 | |
|                              (LUAI_UACINT)lua_tointeger(L, arg))
 | |
|                 : fprintf(f, LUA_NUMBER_FMT,
 | |
|                              (LUAI_UACNUMBER)lua_tonumber(L, arg));
 | |
|       status = status && (len > 0);
 | |
|     }
 | |
|     else {
 | |
|       size_t l;
 | |
|       const char *s = luaL_checklstring(L, arg, &l);
 | |
|       status = status && (fwrite(s, sizeof(char), l, f) == l);
 | |
|     }
 | |
|   }
 | |
|   if (status) return 1;  /* file handle already on stack top */
 | |
|   else return luaL_fileresult(L, status, NULL);
 | |
| }
 | |
| 
 | |
| 
 | |
| static int io_write (lua_State *L) {
 | |
|   return g_write(L, getiofile(L, IO_OUTPUT), 1);
 | |
| }
 | |
| 
 | |
| 
 | |
| static int f_write (lua_State *L) {
 | |
|   FILE *f = tofile(L);
 | |
|   lua_pushvalue(L, 1);  /* push file at the stack top (to be returned) */
 | |
|   return g_write(L, f, 2);
 | |
| }
 | |
| 
 | |
| 
 | |
| static int f_seek (lua_State *L) {
 | |
|   static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
 | |
|   static const char *const modenames[] = {"set", "cur", "end", NULL};
 | |
|   FILE *f = tofile(L);
 | |
|   int op = luaL_checkoption(L, 2, "cur", modenames);
 | |
|   lua_Integer p3 = luaL_optinteger(L, 3, 0);
 | |
|   l_seeknum offset = (l_seeknum)p3;
 | |
|   luaL_argcheck(L, (lua_Integer)offset == p3, 3,
 | |
|                   "not an integer in proper range");
 | |
|   op = l_fseek(f, offset, mode[op]);
 | |
|   if (op)
 | |
|     return luaL_fileresult(L, 0, NULL);  /* error */
 | |
|   else {
 | |
|     lua_pushinteger(L, (lua_Integer)l_ftell(f));
 | |
|     return 1;
 | |
|   }
 | |
| }
 | |
| 
 | |
| 
 | |
| static int f_setvbuf (lua_State *L) {
 | |
|   static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
 | |
|   static const char *const modenames[] = {"no", "full", "line", NULL};
 | |
|   FILE *f = tofile(L);
 | |
|   int op = luaL_checkoption(L, 2, NULL, modenames);
 | |
|   lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
 | |
|   int res = setvbuf(f, NULL, mode[op], (size_t)sz);
 | |
|   return luaL_fileresult(L, res == 0, NULL);
 | |
| }
 | |
| 
 | |
| 
 | |
| 
 | |
| static int io_flush (lua_State *L) {
 | |
|   return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
 | |
| }
 | |
| 
 | |
| 
 | |
| static int f_flush (lua_State *L) {
 | |
|   return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
 | |
| }
 | |
| 
 | |
| 
 | |
| /*
 | |
| ** functions for 'io' library
 | |
| */
 | |
| static const luaL_Reg iolib[] = {
 | |
|   {"close", io_close},
 | |
|   {"flush", io_flush},
 | |
|   {"input", io_input},
 | |
|   {"lines", io_lines},
 | |
|   {"open", io_open},
 | |
|   {"output", io_output},
 | |
|   {"popen", io_popen},
 | |
|   {"read", io_read},
 | |
|   {"tmpfile", io_tmpfile},
 | |
|   {"type", io_type},
 | |
|   {"write", io_write},
 | |
|   {NULL, NULL}
 | |
| };
 | |
| 
 | |
| 
 | |
| /*
 | |
| ** methods for file handles
 | |
| */
 | |
| static const luaL_Reg flib[] = {
 | |
|   {"close", io_close},
 | |
|   {"flush", f_flush},
 | |
|   {"lines", f_lines},
 | |
|   {"read", f_read},
 | |
|   {"seek", f_seek},
 | |
|   {"setvbuf", f_setvbuf},
 | |
|   {"write", f_write},
 | |
|   {"__gc", f_gc},
 | |
|   {"__tostring", f_tostring},
 | |
|   {NULL, NULL}
 | |
| };
 | |
| 
 | |
| 
 | |
| static void createmeta (lua_State *L) {
 | |
|   luaL_newmetatable(L, LUA_FILEHANDLE);  /* create metatable for file handles */
 | |
|   lua_pushvalue(L, -1);  /* push metatable */
 | |
|   lua_setfield(L, -2, "__index");  /* metatable.__index = metatable */
 | |
|   luaL_setfuncs(L, flib, 0);  /* add file methods to new metatable */
 | |
|   lua_pop(L, 1);  /* pop new metatable */
 | |
| }
 | |
| 
 | |
| 
 | |
| /*
 | |
| ** function to (not) close the standard files stdin, stdout, and stderr
 | |
| */
 | |
| static int io_noclose (lua_State *L) {
 | |
|   LStream *p = tolstream(L);
 | |
|   p->closef = &io_noclose;  /* keep file opened */
 | |
|   lua_pushnil(L);
 | |
|   lua_pushliteral(L, "cannot close standard file");
 | |
|   return 2;
 | |
| }
 | |
| 
 | |
| 
 | |
| static void createstdfile (lua_State *L, FILE *f, const char *k,
 | |
|                            const char *fname) {
 | |
|   LStream *p = newprefile(L);
 | |
|   p->f = f;
 | |
|   p->closef = &io_noclose;
 | |
|   if (k != NULL) {
 | |
|     lua_pushvalue(L, -1);
 | |
|     lua_setfield(L, LUA_REGISTRYINDEX, k);  /* add file to registry */
 | |
|   }
 | |
|   lua_setfield(L, -2, fname);  /* add file to module */
 | |
| }
 | |
| 
 | |
| 
 | |
| LUAMOD_API int luaopen_io (lua_State *L) {
 | |
|   luaL_newlib(L, iolib);  /* new module */
 | |
|   createmeta(L);
 | |
|   /* create (and set) default files */
 | |
|   createstdfile(L, stdin, IO_INPUT, "stdin");
 | |
|   createstdfile(L, stdout, IO_OUTPUT, "stdout");
 | |
|   createstdfile(L, stderr, NULL, "stderr");
 | |
|   return 1;
 | |
| }
 | |
| 
 | |
| } // end NS_SLUA
 |