The Battle for Wesnoth  1.15.0-dev
liolib.cpp
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1 /*
2 ** $Id: liolib.c,v 2.151 2016/12/20 18:37:00 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 io_close (lua_State *L) {
210  if (lua_isnone(L, 1)) /* no argument? */
211  lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use standard output */
212  tofile(L); /* make sure argument is an open stream */
213  return aux_close(L);
214 }
215 
216 
217 static int f_gc (lua_State *L) {
218  LStream *p = tolstream(L);
219  if (!isclosed(p) && p->f != NULL)
220  aux_close(L); /* ignore closed and incompletely open files */
221  return 0;
222 }
223 
224 
225 /*
226 ** function to close regular files
227 */
228 static int io_fclose (lua_State *L) {
229  LStream *p = tolstream(L);
230  int res = fclose(p->f);
231  return luaL_fileresult(L, (res == 0), NULL);
232 }
233 
234 
235 static LStream *newfile (lua_State *L) {
236  LStream *p = newprefile(L);
237  p->f = NULL;
238  p->closef = &io_fclose;
239  return p;
240 }
241 
242 
243 static void opencheck (lua_State *L, const char *fname, const char *mode) {
244  LStream *p = newfile(L);
245  p->f = fopen(fname, mode);
246  if (p->f == NULL)
247  luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));
248 }
249 
250 
251 static int io_open (lua_State *L) {
252  const char *filename = luaL_checkstring(L, 1);
253  const char *mode = luaL_optstring(L, 2, "r");
254  LStream *p = newfile(L);
255  const char *md = mode; /* to traverse/check mode */
256  luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
257  p->f = fopen(filename, mode);
258  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
259 }
260 
261 
262 /*
263 ** function to close 'popen' files
264 */
265 static int io_pclose (lua_State *L) {
266  LStream *p = tolstream(L);
267  return luaL_execresult(L, l_pclose(L, p->f));
268 }
269 
270 
271 static int io_popen (lua_State *L) {
272  const char *filename = luaL_checkstring(L, 1);
273  const char *mode = luaL_optstring(L, 2, "r");
274  LStream *p = newprefile(L);
275  p->f = l_popen(L, filename, mode);
276  p->closef = &io_pclose;
277  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
278 }
279 
280 
281 static int io_tmpfile (lua_State *L) {
282  LStream *p = newfile(L);
283  p->f = tmpfile();
284  return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
285 }
286 
287 
288 static FILE *getiofile (lua_State *L, const char *findex) {
289  LStream *p;
290  lua_getfield(L, LUA_REGISTRYINDEX, findex);
291  p = (LStream *)lua_touserdata(L, -1);
292  if (isclosed(p))
293  luaL_error(L, "standard %s file is closed", findex + IOPREF_LEN);
294  return p->f;
295 }
296 
297 
298 static int g_iofile (lua_State *L, const char *f, const char *mode) {
299  if (!lua_isnoneornil(L, 1)) {
300  const char *filename = lua_tostring(L, 1);
301  if (filename)
302  opencheck(L, filename, mode);
303  else {
304  tofile(L); /* check that it's a valid file handle */
305  lua_pushvalue(L, 1);
306  }
308  }
309  /* return current value */
311  return 1;
312 }
313 
314 
315 static int io_input (lua_State *L) {
316  return g_iofile(L, IO_INPUT, "r");
317 }
318 
319 
320 static int io_output (lua_State *L) {
321  return g_iofile(L, IO_OUTPUT, "w");
322 }
323 
324 
325 static int io_readline (lua_State *L);
326 
327 
328 /*
329 ** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit
330 ** in the limit for upvalues of a closure)
331 */
332 #define MAXARGLINE 250
333 
334 static void aux_lines (lua_State *L, int toclose) {
335  int n = lua_gettop(L) - 1; /* number of arguments to read */
336  luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
337  lua_pushinteger(L, n); /* number of arguments to read */
338  lua_pushboolean(L, toclose); /* close/not close file when finished */
339  lua_rotate(L, 2, 2); /* move 'n' and 'toclose' to their positions */
340  lua_pushcclosure(L, io_readline, 3 + n);
341 }
342 
343 
344 static int f_lines (lua_State *L) {
345  tofile(L); /* check that it's a valid file handle */
346  aux_lines(L, 0);
347  return 1;
348 }
349 
350 
351 static int io_lines (lua_State *L) {
352  int toclose;
353  if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */
354  if (lua_isnil(L, 1)) { /* no file name? */
355  lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */
356  lua_replace(L, 1); /* put it at index 1 */
357  tofile(L); /* check that it's a valid file handle */
358  toclose = 0; /* do not close it after iteration */
359  }
360  else { /* open a new file */
361  const char *filename = luaL_checkstring(L, 1);
362  opencheck(L, filename, "r");
363  lua_replace(L, 1); /* put file at index 1 */
364  toclose = 1; /* close it after iteration */
365  }
366  aux_lines(L, toclose);
367  return 1;
368 }
369 
370 
371 /*
372 ** {======================================================
373 ** READ
374 ** =======================================================
375 */
376 
377 
378 /* maximum length of a numeral */
379 #if !defined (L_MAXLENNUM)
380 #define L_MAXLENNUM 200
381 #endif
382 
383 
384 /* auxiliary structure used by 'read_number' */
385 typedef struct {
386  FILE *f; /* file being read */
387  int c; /* current character (look ahead) */
388  int n; /* number of elements in buffer 'buff' */
389  char buff[L_MAXLENNUM + 1]; /* +1 for ending '\0' */
390 } RN;
391 
392 
393 /*
394 ** Add current char to buffer (if not out of space) and read next one
395 */
396 static int nextc (RN *rn) {
397  if (rn->n >= L_MAXLENNUM) { /* buffer overflow? */
398  rn->buff[0] = '\0'; /* invalidate result */
399  return 0; /* fail */
400  }
401  else {
402  rn->buff[rn->n++] = rn->c; /* save current char */
403  rn->c = l_getc(rn->f); /* read next one */
404  return 1;
405  }
406 }
407 
408 
409 /*
410 ** Accept current char if it is in 'set' (of size 2)
411 */
412 static int test2 (RN *rn, const char *set) {
413  if (rn->c == set[0] || rn->c == set[1])
414  return nextc(rn);
415  else return 0;
416 }
417 
418 
419 /*
420 ** Read a sequence of (hex)digits
421 */
422 static int readdigits (RN *rn, int hex) {
423  int count = 0;
424  while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))
425  count++;
426  return count;
427 }
428 
429 
430 /*
431 ** Read a number: first reads a valid prefix of a numeral into a buffer.
432 ** Then it calls 'lua_stringtonumber' to check whether the format is
433 ** correct and to convert it to a Lua number
434 */
435 static int read_number (lua_State *L, FILE *f) {
436  RN rn;
437  int count = 0;
438  int hex = 0;
439  char decp[2];
440  rn.f = f; rn.n = 0;
441  decp[0] = lua_getlocaledecpoint(); /* get decimal point from locale */
442  decp[1] = '.'; /* always accept a dot */
443  l_lockfile(rn.f);
444  do { rn.c = l_getc(rn.f); } while (isspace(rn.c)); /* skip spaces */
445  test2(&rn, "-+"); /* optional signal */
446  if (test2(&rn, "00")) {
447  if (test2(&rn, "xX")) hex = 1; /* numeral is hexadecimal */
448  else count = 1; /* count initial '0' as a valid digit */
449  }
450  count += readdigits(&rn, hex); /* integral part */
451  if (test2(&rn, decp)) /* decimal point? */
452  count += readdigits(&rn, hex); /* fractional part */
453  if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) { /* exponent mark? */
454  test2(&rn, "-+"); /* exponent signal */
455  readdigits(&rn, 0); /* exponent digits */
456  }
457  ungetc(rn.c, rn.f); /* unread look-ahead char */
458  l_unlockfile(rn.f);
459  rn.buff[rn.n] = '\0'; /* finish string */
460  if (lua_stringtonumber(L, rn.buff)) /* is this a valid number? */
461  return 1; /* ok */
462  else { /* invalid format */
463  lua_pushnil(L); /* "result" to be removed */
464  return 0; /* read fails */
465  }
466 }
467 
468 
469 static int test_eof (lua_State *L, FILE *f) {
470  int c = getc(f);
471  ungetc(c, f); /* no-op when c == EOF */
472  lua_pushliteral(L, "");
473  return (c != EOF);
474 }
475 
476 
477 static int read_line (lua_State *L, FILE *f, int chop) {
478  luaL_Buffer b;
479  int c = '\0';
480  luaL_buffinit(L, &b);
481  while (c != EOF && c != '\n') { /* repeat until end of line */
482  char *buff = luaL_prepbuffer(&b); /* preallocate buffer */
483  int i = 0;
484  l_lockfile(f); /* no memory errors can happen inside the lock */
485  while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')
486  buff[i++] = c;
487  l_unlockfile(f);
488  luaL_addsize(&b, i);
489  }
490  if (!chop && c == '\n') /* want a newline and have one? */
491  luaL_addchar(&b, c); /* add ending newline to result */
492  luaL_pushresult(&b); /* close buffer */
493  /* return ok if read something (either a newline or something else) */
494  return (c == '\n' || lua_rawlen(L, -1) > 0);
495 }
496 
497 
498 static void read_all (lua_State *L, FILE *f) {
499  size_t nr;
500  luaL_Buffer b;
501  luaL_buffinit(L, &b);
502  do { /* read file in chunks of LUAL_BUFFERSIZE bytes */
503  char *p = luaL_prepbuffer(&b);
504  nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);
505  luaL_addsize(&b, nr);
506  } while (nr == LUAL_BUFFERSIZE);
507  luaL_pushresult(&b); /* close buffer */
508 }
509 
510 
511 static int read_chars (lua_State *L, FILE *f, size_t n) {
512  size_t nr; /* number of chars actually read */
513  char *p;
514  luaL_Buffer b;
515  luaL_buffinit(L, &b);
516  p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */
517  nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */
518  luaL_addsize(&b, nr);
519  luaL_pushresult(&b); /* close buffer */
520  return (nr > 0); /* true iff read something */
521 }
522 
523 
524 static int g_read (lua_State *L, FILE *f, int first) {
525  int nargs = lua_gettop(L) - 1;
526  int success;
527  int n;
528  clearerr(f);
529  if (nargs == 0) { /* no arguments? */
530  success = read_line(L, f, 1);
531  n = first+1; /* to return 1 result */
532  }
533  else { /* ensure stack space for all results and for auxlib's buffer */
534  luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
535  success = 1;
536  for (n = first; nargs-- && success; n++) {
537  if (lua_type(L, n) == LUA_TNUMBER) {
538  size_t l = (size_t)luaL_checkinteger(L, n);
539  success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
540  }
541  else {
542  const char *p = luaL_checkstring(L, n);
543  if (*p == '*') p++; /* skip optional '*' (for compatibility) */
544  switch (*p) {
545  case 'n': /* number */
546  success = read_number(L, f);
547  break;
548  case 'l': /* line */
549  success = read_line(L, f, 1);
550  break;
551  case 'L': /* line with end-of-line */
552  success = read_line(L, f, 0);
553  break;
554  case 'a': /* file */
555  read_all(L, f); /* read entire file */
556  success = 1; /* always success */
557  break;
558  default:
559  return luaL_argerror(L, n, "invalid format");
560  }
561  }
562  }
563  }
564  if (ferror(f))
565  return luaL_fileresult(L, 0, NULL);
566  if (!success) {
567  lua_pop(L, 1); /* remove last result */
568  lua_pushnil(L); /* push nil instead */
569  }
570  return n - first;
571 }
572 
573 
574 static int io_read (lua_State *L) {
575  return g_read(L, getiofile(L, IO_INPUT), 1);
576 }
577 
578 
579 static int f_read (lua_State *L) {
580  return g_read(L, tofile(L), 2);
581 }
582 
583 
584 static int io_readline (lua_State *L) {
586  int i;
587  int n = (int)lua_tointeger(L, lua_upvalueindex(2));
588  if (isclosed(p)) /* file is already closed? */
589  return luaL_error(L, "file is already closed");
590  lua_settop(L , 1);
591  luaL_checkstack(L, n, "too many arguments");
592  for (i = 1; i <= n; i++) /* push arguments to 'g_read' */
593  lua_pushvalue(L, lua_upvalueindex(3 + i));
594  n = g_read(L, p->f, 2); /* 'n' is number of results */
595  lua_assert(n > 0); /* should return at least a nil */
596  if (lua_toboolean(L, -n)) /* read at least one value? */
597  return n; /* return them */
598  else { /* first result is nil: EOF or error */
599  if (n > 1) { /* is there error information? */
600  /* 2nd result is error message */
601  return luaL_error(L, "%s", lua_tostring(L, -n + 1));
602  }
603  if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */
604  lua_settop(L, 0);
606  aux_close(L); /* close it */
607  }
608  return 0;
609  }
610 }
611 
612 /* }====================================================== */
613 
614 
615 static int g_write (lua_State *L, FILE *f, int arg) {
616  int nargs = lua_gettop(L) - arg;
617  int status = 1;
618  for (; nargs--; arg++) {
619  if (lua_type(L, arg) == LUA_TNUMBER) {
620  /* optimization: could be done exactly as for strings */
621  int len = lua_isinteger(L, arg)
622  ? fprintf(f, LUA_INTEGER_FMT,
623  (LUAI_UACINT)lua_tointeger(L, arg))
624  : fprintf(f, LUA_NUMBER_FMT,
625  (LUAI_UACNUMBER)lua_tonumber(L, arg));
626  status = status && (len > 0);
627  }
628  else {
629  size_t l;
630  const char *s = luaL_checklstring(L, arg, &l);
631  status = status && (fwrite(s, sizeof(char), l, f) == l);
632  }
633  }
634  if (status) return 1; /* file handle already on stack top */
635  else return luaL_fileresult(L, status, NULL);
636 }
637 
638 
639 static int io_write (lua_State *L) {
640  return g_write(L, getiofile(L, IO_OUTPUT), 1);
641 }
642 
643 
644 static int f_write (lua_State *L) {
645  FILE *f = tofile(L);
646  lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
647  return g_write(L, f, 2);
648 }
649 
650 
651 static int f_seek (lua_State *L) {
652  static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
653  static const char *const modenames[] = {"set", "cur", "end", NULL};
654  FILE *f = tofile(L);
655  int op = luaL_checkoption(L, 2, "cur", modenames);
656  lua_Integer p3 = luaL_optinteger(L, 3, 0);
657  l_seeknum offset = (l_seeknum)p3;
658  luaL_argcheck(L, (lua_Integer)offset == p3, 3,
659  "not an integer in proper range");
660  op = l_fseek(f, offset, mode[op]);
661  if (op)
662  return luaL_fileresult(L, 0, NULL); /* error */
663  else {
665  return 1;
666  }
667 }
668 
669 
670 static int f_setvbuf (lua_State *L) {
671  static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
672  static const char *const modenames[] = {"no", "full", "line", NULL};
673  FILE *f = tofile(L);
674  int op = luaL_checkoption(L, 2, NULL, modenames);
676  int res = setvbuf(f, NULL, mode[op], (size_t)sz);
677  return luaL_fileresult(L, res == 0, NULL);
678 }
679 
680 
681 
682 static int io_flush (lua_State *L) {
683  return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
684 }
685 
686 
687 static int f_flush (lua_State *L) {
688  return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
689 }
690 
691 
692 /*
693 ** functions for 'io' library
694 */
695 static const luaL_Reg iolib[] = {
696  {"close", io_close},
697  {"flush", io_flush},
698  {"input", io_input},
699  {"lines", io_lines},
700  {"open", io_open},
701  {"output", io_output},
702  {"popen", io_popen},
703  {"read", io_read},
704  {"tmpfile", io_tmpfile},
705  {"type", io_type},
706  {"write", io_write},
707  {NULL, NULL}
708 };
709 
710 
711 /*
712 ** methods for file handles
713 */
714 static const luaL_Reg flib[] = {
715  {"close", io_close},
716  {"flush", f_flush},
717  {"lines", f_lines},
718  {"read", f_read},
719  {"seek", f_seek},
720  {"setvbuf", f_setvbuf},
721  {"write", f_write},
722  {"__gc", f_gc},
723  {"__tostring", f_tostring},
724  {NULL, NULL}
725 };
726 
727 
728 static void createmeta (lua_State *L) {
729  luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
730  lua_pushvalue(L, -1); /* push metatable */
731  lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
732  luaL_setfuncs(L, flib, 0); /* add file methods to new metatable */
733  lua_pop(L, 1); /* pop new metatable */
734 }
735 
736 
737 /*
738 ** function to (not) close the standard files stdin, stdout, and stderr
739 */
740 static int io_noclose (lua_State *L) {
741  LStream *p = tolstream(L);
742  p->closef = &io_noclose; /* keep file opened */
743  lua_pushnil(L);
744  lua_pushliteral(L, "cannot close standard file");
745  return 2;
746 }
747 
748 
749 static void createstdfile (lua_State *L, FILE *f, const char *k,
750  const char *fname) {
751  LStream *p = newprefile(L);
752  p->f = f;
753  p->closef = &io_noclose;
754  if (k != NULL) {
755  lua_pushvalue(L, -1);
756  lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */
757  }
758  lua_setfield(L, -2, fname); /* add file to module */
759 }
760 
761 
763  luaL_newlib(L, iolib); /* new module */
764  createmeta(L);
765  /* create (and set) default files */
766  createstdfile(L, stdin, IO_INPUT, "stdin");
767  createstdfile(L, stdout, IO_OUTPUT, "stdout");
768  createstdfile(L, stderr, NULL, "stderr");
769  return 1;
770 }
771 
#define luaL_addsize(B, s)
Definition: lauxlib.h:161
static int io_input(lua_State *L)
Definition: liolib.cpp:315
#define lua_isnoneornil(L, n)
Definition: lua.h:359
FILE * f
Definition: lauxlib.h:194
#define isclosed(p)
Definition: liolib.cpp:147
static int f_seek(lua_State *L)
Definition: liolib.cpp:651
static int io_close(lua_State *L)
Definition: liolib.cpp:209
LUA_API void lua_settop(lua_State *L, int idx)
Definition: lapi.cpp:172
#define lua_isnone(L, n)
Definition: lua.h:358
LUA_API int lua_type(lua_State *L, int idx)
Definition: lapi.cpp:251
static void createmeta(lua_State *L)
Definition: liolib.cpp:728
LUALIB_API char * luaL_prepbuffsize(luaL_Buffer *B, size_t sz)
Definition: lauxlib.cpp:505
static int read_line(lua_State *L, FILE *f, int chop)
Definition: liolib.cpp:477
LUA_API void lua_pushboolean(lua_State *L, int b)
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static void read_all(lua_State *L, FILE *f)
Definition: liolib.cpp:498
static int io_fclose(lua_State *L)
Definition: liolib.cpp:228
static FILE * tofile(lua_State *L)
Definition: liolib.cpp:174
#define LUAI_UACNUMBER
Definition: luaconf.h:492
luaL_Stream LStream
Definition: liolib.cpp:142
static void createstdfile(lua_State *L, FILE *f, const char *k, const char *fname)
Definition: liolib.cpp:749
static int test_eof(lua_State *L, FILE *f)
Definition: liolib.cpp:469
static int l_checkmode(const char *mode)
Definition: liolib.cpp:40
LUALIB_API void luaL_pushresult(luaL_Buffer *B)
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static int io_popen(lua_State *L)
Definition: liolib.cpp:271
LUA_API int lua_gettop(lua_State *L)
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#define IOPREF_LEN
Definition: liolib.cpp:137
LUALIB_API int luaL_checkoption(lua_State *L, int arg, const char *def, const char *const lst[])
Definition: lauxlib.cpp:348
static int f_setvbuf(lua_State *L)
Definition: liolib.cpp:670
static int g_write(lua_State *L, FILE *f, int arg)
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#define lua_tointeger(L, i)
Definition: lua.h:342
#define l_popen(L, c, m)
Definition: liolib.cpp:70
#define L_MODEEXT
Definition: liolib.cpp:36
static int g_read(lua_State *L, FILE *f, int first)
Definition: liolib.cpp:524
#define LUA_FILEHANDLE
Definition: lauxlib.h:190
LUALIB_API lua_Integer luaL_optinteger(lua_State *L, int arg, lua_Integer def)
Definition: lauxlib.cpp:440
#define lua_tonumber(L, i)
Definition: lua.h:341
static int f_flush(lua_State *L)
Definition: liolib.cpp:687
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)
Definition: liolib.cpp:91
#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
static int f_read(lua_State *L)
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#define IO_OUTPUT
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#define lua_upvalueindex(i)
Definition: lua.h:43
static int test2(RN *rn, const char *set)
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LUA_INTEGER lua_Integer
Definition: lua.h:93
#define MAXARGLINE
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#define LUAL_BUFFERSIZE
Definition: luaconf.h:751
LUALIB_API int luaL_argerror(lua_State *L, int arg, const char *extramsg)
Definition: lauxlib.cpp:164
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)
Definition: lua.h:105
char buff[L_MAXLENNUM+1]
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static int io_noclose(lua_State *L)
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static int io_pclose(lua_State *L)
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static int io_readline(lua_State *L)
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LUA_API int lua_toboolean(lua_State *L, int idx)
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Definition: liolib.cpp:385
static int read_chars(lua_State *L, FILE *f, size_t n)
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#define l_pclose(L, file)
Definition: liolib.cpp:74
LUALIB_API void luaL_buffinit(lua_State *L, luaL_Buffer *B)
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static int io_output(lua_State *L)
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int n
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#define LUA_TNUMBER
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static int f_write(lua_State *L)
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int c
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static LStream * newprefile(lua_State *L)
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static const luaL_Reg iolib[]
Definition: liolib.cpp:695
LUALIB_API void * luaL_testudata(lua_State *L, int ud, const char *tname)
Definition: lauxlib.cpp:318
#define l_fseek(f, o, w)
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#define luaL_addchar(B, c)
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#define tolstream(L)
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LUA_API void lua_pushnil(lua_State *L)
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FILE * f
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#define lua_pushliteral(L, s)
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#define LUA_NUMBER_FMT
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static int readdigits(RN *rn, int hex)
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#define luaL_prepbuffer(B)
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LUALIB_API int luaL_newmetatable(lua_State *L, const char *tname)
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LUA_API void * lua_touserdata(lua_State *L, int idx)
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#define lua_getlocaledecpoint()
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#define lua_isnil(L, n)
Definition: lua.h:355
static int f_tostring(lua_State *L)
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lua_CFunction closef
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#define lua_assert(c)
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std::size_t i
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LUALIB_API lua_Integer luaL_checkinteger(lua_State *L, int arg)
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#define l_ftell(f)
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mock_party p
static map_location::DIRECTION s
static void aux_lines(lua_State *L, int toclose)
Definition: liolib.cpp:334
#define LUAMOD_API
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#define LUA_MINSTACK
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LUA_API void lua_rotate(lua_State *L, int idx, int n)
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LUA_API int lua_isinteger(lua_State *L, int idx)
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