/*** $Id: liolib.c,v 2.142 2015/01/02 12:50:28 roberto Exp $** Standard I/O (and system) library** See Copyright Notice in lua.h*/ #define liolib_c#define LUA_LIB #include "lprefix.h"  #include <ctype.h>#include <errno.h>#include <locale.h>#include <stdio.h>#include <stdlib.h>#include <string.h> #include "lua.h" #include "lauxlib.h"#include "lualib.h"  #if !defined(l_checkmode) /*** Check whether 'mode' matches '[rwa]%+?b?'.** Change this macro to accept other modes for 'fopen' besides** the standard ones.*/#define l_checkmode(mode) \	(*mode != '\0' && strchr("rwa", *(mode++)) != NULL &&	\	(*mode != '+' || ++mode) &&  /* skip if char is '+' */	\	(*mode != 'b' || ++mode) &&  /* skip if char is 'b' */	\	(*mode == '\0')) #endif /*** {======================================================** l_popen spawns a new process connected to the current** one through the file streams.** =======================================================*/ #if !defined(l_popen)		/* { */ #if defined(LUA_USE_POSIX)	/* { */ #define l_popen(L,c,m)		(fflush(NULL), popen(c,m))#define l_pclose(L,file)	(pclose(file)) #elif defined(LUA_USE_WINDOWS)	/* }{ */ #define l_popen(L,c,m)		(_popen(c,m))#define l_pclose(L,file)	(_pclose(file)) #else				/* }{ */ /* ISO C definitions */#define l_popen(L,c,m)  \	  ((void)((void)c, m), \	  luaL_error(L, "'popen' not supported"), \	  (FILE*)0)#define l_pclose(L,file)		((void)L, (void)file, -1) #endif				/* } */ #endif				/* } */ /* }====================================================== */  #if !defined(l_getc)		/* { */ #if defined(LUA_USE_POSIX)#define l_getc(f)		getc_unlocked(f)#define l_lockfile(f)		flockfile(f)#define l_unlockfile(f)		funlockfile(f)#else#define l_getc(f)		getc(f)#define l_lockfile(f)		((void)0)#define l_unlockfile(f)		((void)0)#endif #endif				/* } */  /*** {======================================================** l_fseek: configuration for longer offsets** =======================================================*/ #if !defined(l_fseek)		/* { */ #if defined(LUA_USE_POSIX)	/* { */ #include <sys/types.h> #define l_fseek(f,o,w)		fseeko(f,o,w)#define l_ftell(f)		ftello(f)#define l_seeknum		off_t #elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \   && defined(_MSC_VER) && (_MSC_VER >= 1400)	/* }{ */ /* Windows (but not DDK) and Visual C++ 2005 or higher */#define l_fseek(f,o,w)		_fseeki64(f,o,w)#define l_ftell(f)		_ftelli64(f)#define l_seeknum		__int64 #else				/* }{ */ /* ISO C definitions */#define l_fseek(f,o,w)		fseek(f,o,w)#define l_ftell(f)		ftell(f)#define l_seeknum		long #endif				/* } */ #endif				/* } */ /* }====================================================== */  #define IO_PREFIX	"_IO_"#define IOPREF_LEN	(sizeof(IO_PREFIX)/sizeof(char) - 1)#define IO_INPUT	(IO_PREFIX "input")#define IO_OUTPUT	(IO_PREFIX "output")  typedef luaL_Stream LStream;  #define tolstream(L)	((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE)) #define isclosed(p)	((p)->closef == NULL)  static int io_type (lua_State *L) {  LStream *p;  luaL_checkany(L, 1);  p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);  if (p == NULL)    lua_pushnil(L);  /* not a file */  else if (isclosed(p))    lua_pushliteral(L, "closed file");  else    lua_pushliteral(L, "file");  return 1;}  static int f_tostring (lua_State *L) {  LStream *p = tolstream(L);  if (isclosed(p))    lua_pushliteral(L, "file (closed)");  else    lua_pushfstring(L, "file (%p)", p->f);  return 1;}  static FILE *tofile (lua_State *L) {  LStream *p = tolstream(L);  if (isclosed(p))    luaL_error(L, "attempt to use a closed file");  lua_assert(p->f);  return p->f;}  /*** When creating file handles, always creates a 'closed' file handle** before opening the actual file; so, if there is a memory error, the** file is not left opened.*/static LStream *newprefile (lua_State *L) {  LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));  p->closef = NULL;  /* mark file handle as 'closed' */  luaL_setmetatable(L, LUA_FILEHANDLE);  return p;}  /*** Calls the 'close' function from a file handle. The 'volatile' avoids** a bug in some versions of the Clang compiler (e.g., clang 3.0 for** 32 bits).*/static int aux_close (lua_State *L) {  LStream *p = tolstream(L);  volatile lua_CFunction cf = p->closef;  p->closef = NULL;  /* mark stream as closed */  return (*cf)(L);  /* close it */}  static int io_close (lua_State *L) {  if (lua_isnone(L, 1))  /* no argument? */    lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT);  /* use standard output */  tofile(L);  /* make sure argument is an open stream */  return aux_close(L);}  static int f_gc (lua_State *L) {  LStream *p = tolstream(L);  if (!isclosed(p) && p->f != NULL)    aux_close(L);  /* ignore closed and incompletely open files */  return 0;}  /*** function to close regular files*/static int io_fclose (lua_State *L) {  LStream *p = tolstream(L);  int res = fclose(p->f);  return luaL_fileresult(L, (res == 0), NULL);}  static LStream *newfile (lua_State *L) {  LStream *p = newprefile(L);  p->f = NULL;  p->closef = &io_fclose;  return p;}  static void opencheck (lua_State *L, const char *fname, const char *mode) {  LStream *p = newfile(L);  p->f = fopen(fname, mode);  if (p->f == NULL)    luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));}  static int io_open (lua_State *L) {  const char *filename = luaL_checkstring(L, 1);  const char *mode = luaL_optstring(L, 2, "r");  LStream *p = newfile(L);  const char *md = mode;  /* to traverse/check mode */  luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");  p->f = fopen(filename, mode);  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;}  /*** function to close 'popen' files*/static int io_pclose (lua_State *L) {  LStream *p = tolstream(L);  return luaL_execresult(L, l_pclose(L, p->f));}  static int io_popen (lua_State *L) {  const char *filename = luaL_checkstring(L, 1);  const char *mode = luaL_optstring(L, 2, "r");  LStream *p = newprefile(L);  p->f = l_popen(L, filename, mode);  p->closef = &io_pclose;  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;}  static int io_tmpfile (lua_State *L) {  LStream *p = newfile(L);  p->f = tmpfile();  return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;}  static FILE *getiofile (lua_State *L, const char *findex) {  LStream *p;  lua_getfield(L, LUA_REGISTRYINDEX, findex);  p = (LStream *)lua_touserdata(L, -1);  if (isclosed(p))    luaL_error(L, "standard %s file is closed", findex + IOPREF_LEN);  return p->f;}  static int g_iofile (lua_State *L, const char *f, const char *mode) {  if (!lua_isnoneornil(L, 1)) {    const char *filename = lua_tostring(L, 1);    if (filename)      opencheck(L, filename, mode);    else {      tofile(L);  /* check that it's a valid file handle */      lua_pushvalue(L, 1);    }    lua_setfield(L, LUA_REGISTRYINDEX, f);  }  /* return current value */  lua_getfield(L, LUA_REGISTRYINDEX, f);  return 1;}  static int io_input (lua_State *L) {  return g_iofile(L, IO_INPUT, "r");}  static int io_output (lua_State *L) {  return g_iofile(L, IO_OUTPUT, "w");}  static int io_readline (lua_State *L);  static void aux_lines (lua_State *L, int toclose) {  int n = lua_gettop(L) - 1;  /* number of arguments to read */  lua_pushinteger(L, n);  /* number of arguments to read */  lua_pushboolean(L, toclose);  /* close/not close file when finished */  lua_rotate(L, 2, 2);  /* move 'n' and 'toclose' to their positions */  lua_pushcclosure(L, io_readline, 3 + n);}  static int f_lines (lua_State *L) {  tofile(L);  /* check that it's a valid file handle */  aux_lines(L, 0);  return 1;}  static int io_lines (lua_State *L) {  int toclose;  if (lua_isnone(L, 1)) lua_pushnil(L);  /* at least one argument */  if (lua_isnil(L, 1)) {  /* no file name? */    lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT);  /* get default input */    lua_replace(L, 1);  /* put it at index 1 */    tofile(L);  /* check that it's a valid file handle */    toclose = 0;  /* do not close it after iteration */  }  else {  /* open a new file */    const char *filename = luaL_checkstring(L, 1);    opencheck(L, filename, "r");    lua_replace(L, 1);  /* put file at index 1 */    toclose = 1;  /* close it after iteration */  }  aux_lines(L, toclose);  return 1;}  /*** {======================================================** READ** =======================================================*/  /* maximum length of a numeral */#define MAXRN		200 /* auxiliary structure used by 'read_number' */typedef struct {  FILE *f;  /* file being read */  int c;  /* current character (look ahead) */  int n;  /* number of elements in buffer 'buff' */  char buff[MAXRN + 1];  /* +1 for ending '\0' */} RN;  /*** Add current char to buffer (if not out of space) and read next one*/static int nextc (RN *rn) {  if (rn->n >= MAXRN) {  /* buffer overflow? */    rn->buff[0] = '\0';  /* invalidate result */    return 0;  /* fail */  }  else {    rn->buff[rn->n++] = rn->c;  /* save current char */    rn->c = l_getc(rn->f);  /* read next one */    return 1;  }}  /*** Accept current char if it is in 'set' (of size 1 or 2)*/static int test2 (RN *rn, const char *set) {  if (rn->c == set[0] || (rn->c == set[1] && rn->c != '\0'))    return nextc(rn);  else return 0;}  /*** Read a sequence of (hex)digits*/static int readdigits (RN *rn, int hex) {  int count = 0;  while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))    count++;  return count;}  /* access to locale "radix character" (decimal point) */#if !defined(l_getlocaledecpoint)#define l_getlocaledecpoint()     (localeconv()->decimal_point[0])#endif  /*** Read a number: first reads a valid prefix of a numeral into a buffer.** Then it calls 'lua_stringtonumber' to check whether the format is** correct and to convert it to a Lua number*/static int read_number (lua_State *L, FILE *f) {  RN rn;  int count = 0;  int hex = 0;  char decp[2] = ".";  rn.f = f; rn.n = 0;  decp[0] = l_getlocaledecpoint();  /* get decimal point from locale */  l_lockfile(rn.f);  do { rn.c = l_getc(rn.f); } while (isspace(rn.c));  /* skip spaces */  test2(&rn, "-+");  /* optional signal */  if (test2(&rn, "0")) {    if (test2(&rn, "xX")) hex = 1;  /* numeral is hexadecimal */    else count = 1;  /* count initial '0' as a valid digit */  }  count += readdigits(&rn, hex);  /* integral part */  if (test2(&rn, decp))  /* decimal point? */    count += readdigits(&rn, hex);  /* fractional part */  if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) {  /* exponent mark? */    test2(&rn, "-+");  /* exponent signal */    readdigits(&rn, 0);  /* exponent digits */  }  ungetc(rn.c, rn.f);  /* unread look-ahead char */  l_unlockfile(rn.f);  rn.buff[rn.n] = '\0';  /* finish string */  if (lua_stringtonumber(L, rn.buff))  /* is this a valid number? */    return 1;  /* ok */  else {  /* invalid format */   lua_pushnil(L);  /* "result" to be removed */   return 0;  /* read fails */  }}  static int test_eof (lua_State *L, FILE *f) {  int c = getc(f);  ungetc(c, f);  /* no-op when c == EOF */  lua_pushlstring(L, NULL, 0);  return (c != EOF);}  static int read_line (lua_State *L, FILE *f, int chop) {  luaL_Buffer b;  int c = '\0';  luaL_buffinit(L, &b);  while (c != EOF && c != '\n') {  /* repeat until end of line */    char *buff = luaL_prepbuffer(&b);  /* pre-allocate buffer */    int i = 0;    l_lockfile(f);  /* no memory errors can happen inside the lock */    while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')      buff[i++] = c;    l_unlockfile(f);    luaL_addsize(&b, i);  }  if (!chop && c == '\n')  /* want a newline and have one? */    luaL_addchar(&b, c);  /* add ending newline to result */  luaL_pushresult(&b);  /* close buffer */  /* return ok if read something (either a newline or something else) */  return (c == '\n' || lua_rawlen(L, -1) > 0);}  static void read_all (lua_State *L, FILE *f) {  size_t nr;  luaL_Buffer b;  luaL_buffinit(L, &b);  do {  /* read file in chunks of LUAL_BUFFERSIZE bytes */    char *p = luaL_prepbuffsize(&b, LUAL_BUFFERSIZE);    nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);    luaL_addsize(&b, nr);  } while (nr == LUAL_BUFFERSIZE);  luaL_pushresult(&b);  /* close buffer */}  static int read_chars (lua_State *L, FILE *f, size_t n) {  size_t nr;  /* number of chars actually read */

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