The Battle for Wesnoth  1.15.0-dev
liolib.cpp
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1 /*
2 ** $Id: liolib.c,v 2.151.1.1 2017/04/19 17:29:57 roberto Exp $
3 ** Standard I/O (and system) library
4 ** See Copyright Notice in lua.h
5 */
6 
7 #define liolib_c
8 #define LUA_LIB
9 
10 #include "lprefix.h"
11 
12 
13 #include <ctype.h>
14 #include <errno.h>
15 #include <locale.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 
20 #include "lua.h"
21 
22 #include "lauxlib.h"
23 #include "lualib.h"
24 
25 
26 
27 
28 /*
29 ** Change this macro to accept other modes for 'fopen' besides
30 ** the standard ones.
31 */
32 #if !defined(l_checkmode)
33 
34 /* accepted extensions to 'mode' in 'fopen' */
35 #if !defined(L_MODEEXT)
36 #define L_MODEEXT "b"
37 #endif
38 
39 /* Check whether 'mode' matches '[rwa]%+?[L_MODEEXT]*' */
40 static int l_checkmode (const char *mode) {
41  return (*mode != '\0' && strchr("rwa", *(mode++)) != NULL &&
42  (*mode != '+' || (++mode, 1)) && /* skip if char is '+' */
43  (strspn(mode, L_MODEEXT) == strlen(mode))); /* check extensions */
44 }
45 
46 #endif
47 
48 /*
49 ** {======================================================
50 ** l_popen spawns a new process connected to the current
51 ** one through the file streams.
52 ** =======================================================
53 */
54 
55 #if !defined(l_popen) /* { */
56 
57 #if defined(LUA_USE_POSIX) /* { */
58 
59 #define l_popen(L,c,m) (fflush(NULL), popen(c,m))
60 #define l_pclose(L,file) (pclose(file))
61 
62 #elif defined(LUA_USE_WINDOWS) /* }{ */
63 
64 #define l_popen(L,c,m) (_popen(c,m))
65 #define l_pclose(L,file) (_pclose(file))
66 
67 #else /* }{ */
68 
69 /* ISO C definitions */
70 #define l_popen(L,c,m) \
71  ((void)((void)c, m), \
72  luaL_error(L, "'popen' not supported"), \
73  (FILE*)0)
74 #define l_pclose(L,file) ((void)L, (void)file, -1)
75 
76 #endif /* } */
77 
78 #endif /* } */
79 
80 /* }====================================================== */
81 
82 
83 #if !defined(l_getc) /* { */
84 
85 #if defined(LUA_USE_POSIX)
86 #define l_getc(f) getc_unlocked(f)
87 #define l_lockfile(f) flockfile(f)
88 #define l_unlockfile(f) funlockfile(f)
89 #else
90 #define l_getc(f) getc(f)
91 #define l_lockfile(f) ((void)0)
92 #define l_unlockfile(f) ((void)0)
93 #endif
94 
95 #endif /* } */
96 
97 
98 /*
99 ** {======================================================
100 ** l_fseek: configuration for longer offsets
101 ** =======================================================
102 */
103 
104 #if !defined(l_fseek) /* { */
105 
106 #if defined(LUA_USE_POSIX) /* { */
107 
108 #include <sys/types.h>
109 
110 #define l_fseek(f,o,w) fseeko(f,o,w)
111 #define l_ftell(f) ftello(f)
112 #define l_seeknum off_t
113 
114 #elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \
115  && defined(_MSC_VER) && (_MSC_VER >= 1400) /* }{ */
116 
117 /* Windows (but not DDK) and Visual C++ 2005 or higher */
118 #define l_fseek(f,o,w) _fseeki64(f,o,w)
119 #define l_ftell(f) _ftelli64(f)
120 #define l_seeknum __int64
121 
122 #else /* }{ */
123 
124 /* ISO C definitions */
125 #define l_fseek(f,o,w) fseek(f,o,w)
126 #define l_ftell(f) ftell(f)
127 #define l_seeknum long
128 
129 #endif /* } */
130 
131 #endif /* } */
132 
133 /* }====================================================== */
134 
135 
136 #define IO_PREFIX "_IO_"
137 #define IOPREF_LEN (sizeof(IO_PREFIX)/sizeof(char) - 1)
138 #define IO_INPUT (IO_PREFIX "input")
139 #define IO_OUTPUT (IO_PREFIX "output")
140 
141 
143 
144 
145 #define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
146 
147 #define isclosed(p) ((p)->closef == NULL)
148 
149 
150 static int io_type (lua_State *L) {
151  LStream *p;
152  luaL_checkany(L, 1);
153  p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
154  if (p == NULL)
155  lua_pushnil(L); /* not a file */
156  else if (isclosed(p))
157  lua_pushliteral(L, "closed file");
158  else
159  lua_pushliteral(L, "file");
160  return 1;
161 }
162 
163 
164 static int f_tostring (lua_State *L) {
165  LStream *p = tolstream(L);
166  if (isclosed(p))
167  lua_pushliteral(L, "file (closed)");
168  else
169  lua_pushfstring(L, "file (%p)", p->f);
170  return 1;
171 }
172 
173 
174 static FILE *tofile (lua_State *L) {
175  LStream *p = tolstream(L);
176  if (isclosed(p))
177  luaL_error(L, "attempt to use a closed file");
178  lua_assert(p->f);
179  return p->f;
180 }
181 
182 
183 /*
184 ** When creating file handles, always creates a 'closed' file handle
185 ** before opening the actual file; so, if there is a memory error, the
186 ** handle is in a consistent state.
187 */
189  LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
190  p->closef = NULL; /* mark file handle as 'closed' */
192  return p;
193 }
194 
195 
196 /*
197 ** Calls the 'close' function from a file handle. The 'volatile' avoids
198 ** a bug in some versions of the Clang compiler (e.g., clang 3.0 for
199 ** 32 bits).
200 */
201 static int aux_close (lua_State *L) {
202  LStream *p = tolstream(L);
203  volatile lua_CFunction cf = p->closef;
204  p->closef = NULL; /* mark stream as closed */
205  return (*cf)(L); /* close it */
206 }
207 
208 
209 static int f_close (lua_State *L) {
210  tofile(L); /* make sure argument is an open stream */
211  return aux_close(L);
212 }
213 
214 
215 static int io_close (lua_State *L) {
216  if (lua_isnone(L, 1)) /* no argument? */
217  lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use standard output */
218  return f_close(L);
219 }
220 
221 
222 static int f_gc (lua_State *L) {
223  LStream *p = tolstream(L);
224  if (!isclosed(p) && p->f != NULL)
225  aux_close(L); /* ignore closed and incompletely open files */
226  return 0;
227 }
228 
229 
230 /*
231 ** function to close regular files
232 */
233 static int io_fclose (lua_State *L) {
234  LStream *p = tolstream(L);
235  int res = fclose(p->f);
236  return luaL_fileresult(L, (res == 0), NULL);
237 }
238 
239 
240 static LStream *newfile (lua_State *L) {
241  LStream *p = newprefile(L);
242  p->f = NULL;
243  p->closef = &io_fclose;
244  return p;
245 }
246 
247 
248 static void opencheck (lua_State *L, const char *fname, const char *mode) {
249  LStream *p = newfile(L);
250  p->f = fopen(fname, mode);
251  if (p->f == NULL)
252  luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));
253 }
254 
255 
256 static int io_open (lua_State *L) {
257  const char *filename = luaL_checkstring(L, 1);
258  const char *mode = luaL_optstring(L, 2, "r");
259  LStream *p = newfile(L);
260  const char *md = mode; /* to traverse/check mode */
261  luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
262  p->f = fopen(filename, mode);
263  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
264 }
265 
266 
267 /*
268 ** function to close 'popen' files
269 */
270 static int io_pclose (lua_State *L) {
271  LStream *p = tolstream(L);
272  return luaL_execresult(L, l_pclose(L, p->f));
273 }
274 
275 
276 static int io_popen (lua_State *L) {
277  const char *filename = luaL_checkstring(L, 1);
278  const char *mode = luaL_optstring(L, 2, "r");
279  LStream *p = newprefile(L);
280  p->f = l_popen(L, filename, mode);
281  p->closef = &io_pclose;
282  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
283 }
284 
285 
286 static int io_tmpfile (lua_State *L) {
287  LStream *p = newfile(L);
288  p->f = tmpfile();
289  return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
290 }
291 
292 
293 static FILE *getiofile (lua_State *L, const char *findex) {
294  LStream *p;
295  lua_getfield(L, LUA_REGISTRYINDEX, findex);
296  p = (LStream *)lua_touserdata(L, -1);
297  if (isclosed(p))
298  luaL_error(L, "standard %s file is closed", findex + IOPREF_LEN);
299  return p->f;
300 }
301 
302 
303 static int g_iofile (lua_State *L, const char *f, const char *mode) {
304  if (!lua_isnoneornil(L, 1)) {
305  const char *filename = lua_tostring(L, 1);
306  if (filename)
307  opencheck(L, filename, mode);
308  else {
309  tofile(L); /* check that it's a valid file handle */
310  lua_pushvalue(L, 1);
311  }
313  }
314  /* return current value */
316  return 1;
317 }
318 
319 
320 static int io_input (lua_State *L) {
321  return g_iofile(L, IO_INPUT, "r");
322 }
323 
324 
325 static int io_output (lua_State *L) {
326  return g_iofile(L, IO_OUTPUT, "w");
327 }
328 
329 
330 static int io_readline (lua_State *L);
331 
332 
333 /*
334 ** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit
335 ** in the limit for upvalues of a closure)
336 */
337 #define MAXARGLINE 250
338 
339 static void aux_lines (lua_State *L, int toclose) {
340  int n = lua_gettop(L) - 1; /* number of arguments to read */
341  luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
342  lua_pushinteger(L, n); /* number of arguments to read */
343  lua_pushboolean(L, toclose); /* close/not close file when finished */
344  lua_rotate(L, 2, 2); /* move 'n' and 'toclose' to their positions */
345  lua_pushcclosure(L, io_readline, 3 + n);
346 }
347 
348 
349 static int f_lines (lua_State *L) {
350  tofile(L); /* check that it's a valid file handle */
351  aux_lines(L, 0);
352  return 1;
353 }
354 
355 
356 static int io_lines (lua_State *L) {
357  int toclose;
358  if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */
359  if (lua_isnil(L, 1)) { /* no file name? */
360  lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */
361  lua_replace(L, 1); /* put it at index 1 */
362  tofile(L); /* check that it's a valid file handle */
363  toclose = 0; /* do not close it after iteration */
364  }
365  else { /* open a new file */
366  const char *filename = luaL_checkstring(L, 1);
367  opencheck(L, filename, "r");
368  lua_replace(L, 1); /* put file at index 1 */
369  toclose = 1; /* close it after iteration */
370  }
371  aux_lines(L, toclose);
372  return 1;
373 }
374 
375 
376 /*
377 ** {======================================================
378 ** READ
379 ** =======================================================
380 */
381 
382 
383 /* maximum length of a numeral */
384 #if !defined (L_MAXLENNUM)
385 #define L_MAXLENNUM 200
386 #endif
387 
388 
389 /* auxiliary structure used by 'read_number' */
390 typedef struct {
391  FILE *f; /* file being read */
392  int c; /* current character (look ahead) */
393  int n; /* number of elements in buffer 'buff' */
394  char buff[L_MAXLENNUM + 1]; /* +1 for ending '\0' */
395 } RN;
396 
397 
398 /*
399 ** Add current char to buffer (if not out of space) and read next one
400 */
401 static int nextc (RN *rn) {
402  if (rn->n >= L_MAXLENNUM) { /* buffer overflow? */
403  rn->buff[0] = '\0'; /* invalidate result */
404  return 0; /* fail */
405  }
406  else {
407  rn->buff[rn->n++] = rn->c; /* save current char */
408  rn->c = l_getc(rn->f); /* read next one */
409  return 1;
410  }
411 }
412 
413 
414 /*
415 ** Accept current char if it is in 'set' (of size 2)
416 */
417 static int test2 (RN *rn, const char *set) {
418  if (rn->c == set[0] || rn->c == set[1])
419  return nextc(rn);
420  else return 0;
421 }
422 
423 
424 /*
425 ** Read a sequence of (hex)digits
426 */
427 static int readdigits (RN *rn, int hex) {
428  int count = 0;
429  while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))
430  count++;
431  return count;
432 }
433 
434 
435 /*
436 ** Read a number: first reads a valid prefix of a numeral into a buffer.
437 ** Then it calls 'lua_stringtonumber' to check whether the format is
438 ** correct and to convert it to a Lua number
439 */
440 static int read_number (lua_State *L, FILE *f) {
441  RN rn;
442  int count = 0;
443  int hex = 0;
444  char decp[2];
445  rn.f = f; rn.n = 0;
446  decp[0] = lua_getlocaledecpoint(); /* get decimal point from locale */
447  decp[1] = '.'; /* always accept a dot */
448  l_lockfile(rn.f);
449  do { rn.c = l_getc(rn.f); } while (isspace(rn.c)); /* skip spaces */
450  test2(&rn, "-+"); /* optional signal */
451  if (test2(&rn, "00")) {
452  if (test2(&rn, "xX")) hex = 1; /* numeral is hexadecimal */
453  else count = 1; /* count initial '0' as a valid digit */
454  }
455  count += readdigits(&rn, hex); /* integral part */
456  if (test2(&rn, decp)) /* decimal point? */
457  count += readdigits(&rn, hex); /* fractional part */
458  if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) { /* exponent mark? */
459  test2(&rn, "-+"); /* exponent signal */
460  readdigits(&rn, 0); /* exponent digits */
461  }
462  ungetc(rn.c, rn.f); /* unread look-ahead char */
463  l_unlockfile(rn.f);
464  rn.buff[rn.n] = '\0'; /* finish string */
465  if (lua_stringtonumber(L, rn.buff)) /* is this a valid number? */
466  return 1; /* ok */
467  else { /* invalid format */
468  lua_pushnil(L); /* "result" to be removed */
469  return 0; /* read fails */
470  }
471 }
472 
473 
474 static int test_eof (lua_State *L, FILE *f) {
475  int c = getc(f);
476  ungetc(c, f); /* no-op when c == EOF */
477  lua_pushliteral(L, "");
478  return (c != EOF);
479 }
480 
481 
482 static int read_line (lua_State *L, FILE *f, int chop) {
483  luaL_Buffer b;
484  int c = '\0';
485  luaL_buffinit(L, &b);
486  while (c != EOF && c != '\n') { /* repeat until end of line */
487  char *buff = luaL_prepbuffer(&b); /* preallocate buffer */
488  int i = 0;
489  l_lockfile(f); /* no memory errors can happen inside the lock */
490  while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')
491  buff[i++] = c;
492  l_unlockfile(f);
493  luaL_addsize(&b, i);
494  }
495  if (!chop && c == '\n') /* want a newline and have one? */
496  luaL_addchar(&b, c); /* add ending newline to result */
497  luaL_pushresult(&b); /* close buffer */
498  /* return ok if read something (either a newline or something else) */
499  return (c == '\n' || lua_rawlen(L, -1) > 0);
500 }
501 
502 
503 static void read_all (lua_State *L, FILE *f) {
504  size_t nr;
505  luaL_Buffer b;
506  luaL_buffinit(L, &b);
507  do { /* read file in chunks of LUAL_BUFFERSIZE bytes */
508  char *p = luaL_prepbuffer(&b);
509  nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);
510  luaL_addsize(&b, nr);
511  } while (nr == LUAL_BUFFERSIZE);
512  luaL_pushresult(&b); /* close buffer */
513 }
514 
515 
516 static int read_chars (lua_State *L, FILE *f, size_t n) {
517  size_t nr; /* number of chars actually read */
518  char *p;
519  luaL_Buffer b;
520  luaL_buffinit(L, &b);
521  p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */
522  nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */
523  luaL_addsize(&b, nr);
524  luaL_pushresult(&b); /* close buffer */
525  return (nr > 0); /* true iff read something */
526 }
527 
528 
529 static int g_read (lua_State *L, FILE *f, int first) {
530  int nargs = lua_gettop(L) - 1;
531  int success;
532  int n;
533  clearerr(f);
534  if (nargs == 0) { /* no arguments? */
535  success = read_line(L, f, 1);
536  n = first+1; /* to return 1 result */
537  }
538  else { /* ensure stack space for all results and for auxlib's buffer */
539  luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
540  success = 1;
541  for (n = first; nargs-- && success; n++) {
542  if (lua_type(L, n) == LUA_TNUMBER) {
543  size_t l = (size_t)luaL_checkinteger(L, n);
544  success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
545  }
546  else {
547  const char *p = luaL_checkstring(L, n);
548  if (*p == '*') p++; /* skip optional '*' (for compatibility) */
549  switch (*p) {
550  case 'n': /* number */
551  success = read_number(L, f);
552  break;
553  case 'l': /* line */
554  success = read_line(L, f, 1);
555  break;
556  case 'L': /* line with end-of-line */
557  success = read_line(L, f, 0);
558  break;
559  case 'a': /* file */
560  read_all(L, f); /* read entire file */
561  success = 1; /* always success */
562  break;
563  default:
564  return luaL_argerror(L, n, "invalid format");
565  }
566  }
567  }
568  }
569  if (ferror(f))
570  return luaL_fileresult(L, 0, NULL);
571  if (!success) {
572  lua_pop(L, 1); /* remove last result */
573  lua_pushnil(L); /* push nil instead */
574  }
575  return n - first;
576 }
577 
578 
579 static int io_read (lua_State *L) {
580  return g_read(L, getiofile(L, IO_INPUT), 1);
581 }
582 
583 
584 static int f_read (lua_State *L) {
585  return g_read(L, tofile(L), 2);
586 }
587 
588 
589 static int io_readline (lua_State *L) {
591  int i;
592  int n = (int)lua_tointeger(L, lua_upvalueindex(2));
593  if (isclosed(p)) /* file is already closed? */
594  return luaL_error(L, "file is already closed");
595  lua_settop(L , 1);
596  luaL_checkstack(L, n, "too many arguments");
597  for (i = 1; i <= n; i++) /* push arguments to 'g_read' */
598  lua_pushvalue(L, lua_upvalueindex(3 + i));
599  n = g_read(L, p->f, 2); /* 'n' is number of results */
600  lua_assert(n > 0); /* should return at least a nil */
601  if (lua_toboolean(L, -n)) /* read at least one value? */
602  return n; /* return them */
603  else { /* first result is nil: EOF or error */
604  if (n > 1) { /* is there error information? */
605  /* 2nd result is error message */
606  return luaL_error(L, "%s", lua_tostring(L, -n + 1));
607  }
608  if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */
609  lua_settop(L, 0);
611  aux_close(L); /* close it */
612  }
613  return 0;
614  }
615 }
616 
617 /* }====================================================== */
618 
619 
620 static int g_write (lua_State *L, FILE *f, int arg) {
621  int nargs = lua_gettop(L) - arg;
622  int status = 1;
623  for (; nargs--; arg++) {
624  if (lua_type(L, arg) == LUA_TNUMBER) {
625  /* optimization: could be done exactly as for strings */
626  int len = lua_isinteger(L, arg)
627  ? fprintf(f, LUA_INTEGER_FMT,
628  (LUAI_UACINT)lua_tointeger(L, arg))
629  : fprintf(f, LUA_NUMBER_FMT,
630  (LUAI_UACNUMBER)lua_tonumber(L, arg));
631  status = status && (len > 0);
632  }
633  else {
634  size_t l;
635  const char *s = luaL_checklstring(L, arg, &l);
636  status = status && (fwrite(s, sizeof(char), l, f) == l);
637  }
638  }
639  if (status) return 1; /* file handle already on stack top */
640  else return luaL_fileresult(L, status, NULL);
641 }
642 
643 
644 static int io_write (lua_State *L) {
645  return g_write(L, getiofile(L, IO_OUTPUT), 1);
646 }
647 
648 
649 static int f_write (lua_State *L) {
650  FILE *f = tofile(L);
651  lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
652  return g_write(L, f, 2);
653 }
654 
655 
656 static int f_seek (lua_State *L) {
657  static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
658  static const char *const modenames[] = {"set", "cur", "end", NULL};
659  FILE *f = tofile(L);
660  int op = luaL_checkoption(L, 2, "cur", modenames);
661  lua_Integer p3 = luaL_optinteger(L, 3, 0);
662  l_seeknum offset = (l_seeknum)p3;
663  luaL_argcheck(L, (lua_Integer)offset == p3, 3,
664  "not an integer in proper range");
665  op = l_fseek(f, offset, mode[op]);
666  if (op)
667  return luaL_fileresult(L, 0, NULL); /* error */
668  else {
670  return 1;
671  }
672 }
673 
674 
675 static int f_setvbuf (lua_State *L) {
676  static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
677  static const char *const modenames[] = {"no", "full", "line", NULL};
678  FILE *f = tofile(L);
679  int op = luaL_checkoption(L, 2, NULL, modenames);
681  int res = setvbuf(f, NULL, mode[op], (size_t)sz);
682  return luaL_fileresult(L, res == 0, NULL);
683 }
684 
685 
686 
687 static int io_flush (lua_State *L) {
688  return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
689 }
690 
691 
692 static int f_flush (lua_State *L) {
693  return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
694 }
695 
696 
697 /*
698 ** functions for 'io' library
699 */
700 static const luaL_Reg iolib[] = {
701  {"close", io_close},
702  {"flush", io_flush},
703  {"input", io_input},
704  {"lines", io_lines},
705  {"open", io_open},
706  {"output", io_output},
707  {"popen", io_popen},
708  {"read", io_read},
709  {"tmpfile", io_tmpfile},
710  {"type", io_type},
711  {"write", io_write},
712  {NULL, NULL}
713 };
714 
715 
716 /*
717 ** methods for file handles
718 */
719 static const luaL_Reg flib[] = {
720  {"close", f_close},
721  {"flush", f_flush},
722  {"lines", f_lines},
723  {"read", f_read},
724  {"seek", f_seek},
725  {"setvbuf", f_setvbuf},
726  {"write", f_write},
727  {"__gc", f_gc},
728  {"__tostring", f_tostring},
729  {NULL, NULL}
730 };
731 
732 
733 static void createmeta (lua_State *L) {
734  luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
735  lua_pushvalue(L, -1); /* push metatable */
736  lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
737  luaL_setfuncs(L, flib, 0); /* add file methods to new metatable */
738  lua_pop(L, 1); /* pop new metatable */
739 }
740 
741 
742 /*
743 ** function to (not) close the standard files stdin, stdout, and stderr
744 */
745 static int io_noclose (lua_State *L) {
746  LStream *p = tolstream(L);
747  p->closef = &io_noclose; /* keep file opened */
748  lua_pushnil(L);
749  lua_pushliteral(L, "cannot close standard file");
750  return 2;
751 }
752 
753 
754 static void createstdfile (lua_State *L, FILE *f, const char *k,
755  const char *fname) {
756  LStream *p = newprefile(L);
757  p->f = f;
758  p->closef = &io_noclose;
759  if (k != NULL) {
760  lua_pushvalue(L, -1);
761  lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */
762  }
763  lua_setfield(L, -2, fname); /* add file to module */
764 }
765 
766 
768  luaL_newlib(L, iolib); /* new module */
769  createmeta(L);
770  /* create (and set) default files */
771  createstdfile(L, stdin, IO_INPUT, "stdin");
772  createstdfile(L, stdout, IO_OUTPUT, "stdout");
773  createstdfile(L, stderr, NULL, "stderr");
774  return 1;
775 }
776 
#define luaL_addsize(B, s)
Definition: lauxlib.h:161
static int io_input(lua_State *L)
Definition: liolib.cpp:320
#define lua_isnoneornil(L, n)
Definition: lua.h:359
FILE * f
Definition: lauxlib.h:194
#define isclosed(p)
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static int f_seek(lua_State *L)
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static int io_close(lua_State *L)
Definition: liolib.cpp:215
LUA_API void lua_settop(lua_State *L, int idx)
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#define lua_isnone(L, n)
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LUA_API int lua_type(lua_State *L, int idx)
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static void createmeta(lua_State *L)
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LUALIB_API char * luaL_prepbuffsize(luaL_Buffer *B, size_t sz)
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LUA_API void lua_pushboolean(lua_State *L, int b)
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static void read_all(lua_State *L, FILE *f)
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static int io_fclose(lua_State *L)
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static FILE * tofile(lua_State *L)
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#define LUAI_UACNUMBER
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luaL_Stream LStream
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static void createstdfile(lua_State *L, FILE *f, const char *k, const char *fname)
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static int test_eof(lua_State *L, FILE *f)
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static int l_checkmode(const char *mode)
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LUALIB_API void luaL_pushresult(luaL_Buffer *B)
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static int io_popen(lua_State *L)
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LUA_API int lua_gettop(lua_State *L)
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#define IOPREF_LEN
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LUALIB_API int luaL_checkoption(lua_State *L, int arg, const char *def, const char *const lst[])
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static int f_setvbuf(lua_State *L)
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static int g_write(lua_State *L, FILE *f, int arg)
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#define l_popen(L, c, m)
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#define L_MODEEXT
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static int g_read(lua_State *L, FILE *f, int first)
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#define LUA_FILEHANDLE
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LUALIB_API lua_Integer luaL_optinteger(lua_State *L, int arg, lua_Integer def)
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#define lua_tonumber(L, i)
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LUALIB_API void luaL_checkstack(lua_State *L, int space, const char *msg)
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LUA_API void lua_pushcclosure(lua_State *L, lua_CFunction fn, int n)
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#define l_lockfile(f)
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#define l_getc(f)
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LUALIB_API void luaL_setmetatable(lua_State *L, const char *tname)
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static FILE * getiofile(lua_State *L, const char *findex)
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LUA_API void * lua_newuserdata(lua_State *L, size_t size)
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#define lua_pop(L, n)
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static int aux_close(lua_State *L)
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#define b
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#define lua_upvalueindex(i)
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static int test2(RN *rn, const char *set)
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LUA_INTEGER lua_Integer
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#define MAXARGLINE
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#define LUAL_BUFFERSIZE
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LUALIB_API int luaL_argerror(lua_State *L, int arg, const char *extramsg)
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LUAMOD_API int luaopen_io(lua_State *L)
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LUALIB_API int luaL_fileresult(lua_State *L, int stat, const char *fname)
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static int read_number(lua_State *L, FILE *f)
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int(* lua_CFunction)(lua_State *L)
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char buff[L_MAXLENNUM+1]
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LUA_API int lua_toboolean(lua_State *L, int idx)
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#define l_pclose(L, file)
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LUALIB_API void luaL_buffinit(lua_State *L, luaL_Buffer *B)
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int n
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#define LUA_TNUMBER
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int c
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static const luaL_Reg iolib[]
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#define tolstream(L)
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FILE * f
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LUALIB_API lua_Integer luaL_checkinteger(lua_State *L, int arg)
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