The Battle for Wesnoth  1.17.0-dev
liolib.cpp
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1 /*
2 ** $Id: liolib.c $
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 != '+' || ((void)(++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_checkmodep)
56 /* By default, Lua accepts only "r" or "w" as mode */
57 #define l_checkmodep(m) ((m[0] == 'r' || m[0] == 'w') && m[1] == '\0')
58 #endif
59 
60 
61 #if !defined(l_popen) /* { */
62 
63 #if defined(LUA_USE_POSIX) /* { */
64 
65 #define l_popen(L,c,m) (fflush(NULL), popen(c,m))
66 #define l_pclose(L,file) (pclose(file))
67 
68 #elif defined(LUA_USE_WINDOWS) /* }{ */
69 
70 #define l_popen(L,c,m) (_popen(c,m))
71 #define l_pclose(L,file) (_pclose(file))
72 
73 #else /* }{ */
74 
75 /* ISO C definitions */
76 #define l_popen(L,c,m) \
77  ((void)c, (void)m, \
78  luaL_error(L, "'popen' not supported"), \
79  (FILE*)0)
80 #define l_pclose(L,file) ((void)L, (void)file, -1)
81 
82 #endif /* } */
83 
84 #endif /* } */
85 
86 /* }====================================================== */
87 
88 
89 #if !defined(l_getc) /* { */
90 
91 #if defined(LUA_USE_POSIX)
92 #define l_getc(f) getc_unlocked(f)
93 #define l_lockfile(f) flockfile(f)
94 #define l_unlockfile(f) funlockfile(f)
95 #else
96 #define l_getc(f) getc(f)
97 #define l_lockfile(f) ((void)0)
98 #define l_unlockfile(f) ((void)0)
99 #endif
100 
101 #endif /* } */
102 
103 
104 /*
105 ** {======================================================
106 ** l_fseek: configuration for longer offsets
107 ** =======================================================
108 */
109 
110 #if !defined(l_fseek) /* { */
111 
112 #if defined(LUA_USE_POSIX) /* { */
113 
114 #include <sys/types.h>
115 
116 #define l_fseek(f,o,w) fseeko(f,o,w)
117 #define l_ftell(f) ftello(f)
118 #define l_seeknum off_t
119 
120 #elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \
121  && defined(_MSC_VER) && (_MSC_VER >= 1400) /* }{ */
122 
123 /* Windows (but not DDK) and Visual C++ 2005 or higher */
124 #define l_fseek(f,o,w) _fseeki64(f,o,w)
125 #define l_ftell(f) _ftelli64(f)
126 #define l_seeknum __int64
127 
128 #else /* }{ */
129 
130 /* ISO C definitions */
131 #define l_fseek(f,o,w) fseek(f,o,w)
132 #define l_ftell(f) ftell(f)
133 #define l_seeknum long
134 
135 #endif /* } */
136 
137 #endif /* } */
138 
139 /* }====================================================== */
140 
141 
142 
143 #define IO_PREFIX "_IO_"
144 #define IOPREF_LEN (sizeof(IO_PREFIX)/sizeof(char) - 1)
145 #define IO_INPUT (IO_PREFIX "input")
146 #define IO_OUTPUT (IO_PREFIX "output")
147 
148 
150 
151 
152 #define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
153 
154 #define isclosed(p) ((p)->closef == NULL)
155 
156 
157 static int io_type (lua_State *L) {
158  LStream *p;
159  luaL_checkany(L, 1);
160  p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
161  if (p == NULL)
162  luaL_pushfail(L); /* not a file */
163  else if (isclosed(p))
164  lua_pushliteral(L, "closed file");
165  else
166  lua_pushliteral(L, "file");
167  return 1;
168 }
169 
170 
171 static int f_tostring (lua_State *L) {
172  LStream *p = tolstream(L);
173  if (isclosed(p))
174  lua_pushliteral(L, "file (closed)");
175  else
176  lua_pushfstring(L, "file (%p)", p->f);
177  return 1;
178 }
179 
180 
181 static FILE *tofile (lua_State *L) {
182  LStream *p = tolstream(L);
183  if (isclosed(p))
184  luaL_error(L, "attempt to use a closed file");
185  lua_assert(p->f);
186  return p->f;
187 }
188 
189 
190 /*
191 ** When creating file handles, always creates a 'closed' file handle
192 ** before opening the actual file; so, if there is a memory error, the
193 ** handle is in a consistent state.
194 */
196  LStream *p = (LStream *)lua_newuserdatauv(L, sizeof(LStream), 0);
197  p->closef = NULL; /* mark file handle as 'closed' */
199  return p;
200 }
201 
202 
203 /*
204 ** Calls the 'close' function from a file handle. The 'volatile' avoids
205 ** a bug in some versions of the Clang compiler (e.g., clang 3.0 for
206 ** 32 bits).
207 */
208 static int aux_close (lua_State *L) {
209  LStream *p = tolstream(L);
210  volatile lua_CFunction cf = p->closef;
211  p->closef = NULL; /* mark stream as closed */
212  return (*cf)(L); /* close it */
213 }
214 
215 
216 static int f_close (lua_State *L) {
217  tofile(L); /* make sure argument is an open stream */
218  return aux_close(L);
219 }
220 
221 
222 static int io_close (lua_State *L) {
223  if (lua_isnone(L, 1)) /* no argument? */
224  lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use default output */
225  return f_close(L);
226 }
227 
228 
229 static int f_gc (lua_State *L) {
230  LStream *p = tolstream(L);
231  if (!isclosed(p) && p->f != NULL)
232  aux_close(L); /* ignore closed and incompletely open files */
233  return 0;
234 }
235 
236 
237 /*
238 ** function to close regular files
239 */
240 static int io_fclose (lua_State *L) {
241  LStream *p = tolstream(L);
242  int res = fclose(p->f);
243  return luaL_fileresult(L, (res == 0), NULL);
244 }
245 
246 
247 static LStream *newfile (lua_State *L) {
248  LStream *p = newprefile(L);
249  p->f = NULL;
250  p->closef = &io_fclose;
251  return p;
252 }
253 
254 
255 static void opencheck (lua_State *L, const char *fname, const char *mode) {
256  LStream *p = newfile(L);
257  p->f = fopen(fname, mode);
258  if (p->f == NULL)
259  luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));
260 }
261 
262 
263 static int io_open (lua_State *L) {
264  const char *filename = luaL_checkstring(L, 1);
265  const char *mode = luaL_optstring(L, 2, "r");
266  LStream *p = newfile(L);
267  const char *md = mode; /* to traverse/check mode */
268  luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
269  p->f = fopen(filename, mode);
270  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
271 }
272 
273 
274 /*
275 ** function to close 'popen' files
276 */
277 static int io_pclose (lua_State *L) {
278  LStream *p = tolstream(L);
279  errno = 0;
280  return luaL_execresult(L, l_pclose(L, p->f));
281 }
282 
283 
284 static int io_popen (lua_State *L) {
285  const char *filename = luaL_checkstring(L, 1);
286  const char *mode = luaL_optstring(L, 2, "r");
287  LStream *p = newprefile(L);
288  luaL_argcheck(L, l_checkmodep(mode), 2, "invalid mode");
289  p->f = l_popen(L, filename, mode);
290  p->closef = &io_pclose;
291  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
292 }
293 
294 
295 static int io_tmpfile (lua_State *L) {
296  LStream *p = newfile(L);
297  p->f = tmpfile();
298  return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
299 }
300 
301 
302 static FILE *getiofile (lua_State *L, const char *findex) {
303  LStream *p;
304  lua_getfield(L, LUA_REGISTRYINDEX, findex);
305  p = (LStream *)lua_touserdata(L, -1);
306  if (isclosed(p))
307  luaL_error(L, "default %s file is closed", findex + IOPREF_LEN);
308  return p->f;
309 }
310 
311 
312 static int g_iofile (lua_State *L, const char *f, const char *mode) {
313  if (!lua_isnoneornil(L, 1)) {
314  const char *filename = lua_tostring(L, 1);
315  if (filename)
316  opencheck(L, filename, mode);
317  else {
318  tofile(L); /* check that it's a valid file handle */
319  lua_pushvalue(L, 1);
320  }
322  }
323  /* return current value */
325  return 1;
326 }
327 
328 
329 static int io_input (lua_State *L) {
330  return g_iofile(L, IO_INPUT, "r");
331 }
332 
333 
334 static int io_output (lua_State *L) {
335  return g_iofile(L, IO_OUTPUT, "w");
336 }
337 
338 
339 static int io_readline (lua_State *L);
340 
341 
342 /*
343 ** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit
344 ** in the limit for upvalues of a closure)
345 */
346 #define MAXARGLINE 250
347 
348 /*
349 ** Auxiliary function to create the iteration function for 'lines'.
350 ** The iteration function is a closure over 'io_readline', with
351 ** the following upvalues:
352 ** 1) The file being read (first value in the stack)
353 ** 2) the number of arguments to read
354 ** 3) a boolean, true iff file has to be closed when finished ('toclose')
355 ** *) a variable number of format arguments (rest of the stack)
356 */
357 static void aux_lines (lua_State *L, int toclose) {
358  int n = lua_gettop(L) - 1; /* number of arguments to read */
359  luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
360  lua_pushvalue(L, 1); /* file */
361  lua_pushinteger(L, n); /* number of arguments to read */
362  lua_pushboolean(L, toclose); /* close/not close file when finished */
363  lua_rotate(L, 2, 3); /* move the three values to their positions */
364  lua_pushcclosure(L, io_readline, 3 + n);
365 }
366 
367 
368 static int f_lines (lua_State *L) {
369  tofile(L); /* check that it's a valid file handle */
370  aux_lines(L, 0);
371  return 1;
372 }
373 
374 
375 /*
376 ** Return an iteration function for 'io.lines'. If file has to be
377 ** closed, also returns the file itself as a second result (to be
378 ** closed as the state at the exit of a generic for).
379 */
380 static int io_lines (lua_State *L) {
381  int toclose;
382  if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */
383  if (lua_isnil(L, 1)) { /* no file name? */
384  lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */
385  lua_replace(L, 1); /* put it at index 1 */
386  tofile(L); /* check that it's a valid file handle */
387  toclose = 0; /* do not close it after iteration */
388  }
389  else { /* open a new file */
390  const char *filename = luaL_checkstring(L, 1);
391  opencheck(L, filename, "r");
392  lua_replace(L, 1); /* put file at index 1 */
393  toclose = 1; /* close it after iteration */
394  }
395  aux_lines(L, toclose); /* push iteration function */
396  if (toclose) {
397  lua_pushnil(L); /* state */
398  lua_pushnil(L); /* control */
399  lua_pushvalue(L, 1); /* file is the to-be-closed variable (4th result) */
400  return 4;
401  }
402  else
403  return 1;
404 }
405 
406 
407 /*
408 ** {======================================================
409 ** READ
410 ** =======================================================
411 */
412 
413 
414 /* maximum length of a numeral */
415 #if !defined (L_MAXLENNUM)
416 #define L_MAXLENNUM 200
417 #endif
418 
419 
420 /* auxiliary structure used by 'read_number' */
421 typedef struct {
422  FILE *f; /* file being read */
423  int c; /* current character (look ahead) */
424  int n; /* number of elements in buffer 'buff' */
425  char buff[L_MAXLENNUM + 1]; /* +1 for ending '\0' */
426 } RN;
427 
428 
429 /*
430 ** Add current char to buffer (if not out of space) and read next one
431 */
432 static int nextc (RN *rn) {
433  if (rn->n >= L_MAXLENNUM) { /* buffer overflow? */
434  rn->buff[0] = '\0'; /* invalidate result */
435  return 0; /* fail */
436  }
437  else {
438  rn->buff[rn->n++] = rn->c; /* save current char */
439  rn->c = l_getc(rn->f); /* read next one */
440  return 1;
441  }
442 }
443 
444 
445 /*
446 ** Accept current char if it is in 'set' (of size 2)
447 */
448 static int test2 (RN *rn, const char *set) {
449  if (rn->c == set[0] || rn->c == set[1])
450  return nextc(rn);
451  else return 0;
452 }
453 
454 
455 /*
456 ** Read a sequence of (hex)digits
457 */
458 static int readdigits (RN *rn, int hex) {
459  int count = 0;
460  while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))
461  count++;
462  return count;
463 }
464 
465 
466 /*
467 ** Read a number: first reads a valid prefix of a numeral into a buffer.
468 ** Then it calls 'lua_stringtonumber' to check whether the format is
469 ** correct and to convert it to a Lua number.
470 */
471 static int read_number (lua_State *L, FILE *f) {
472  RN rn;
473  int count = 0;
474  int hex = 0;
475  char decp[2];
476  rn.f = f; rn.n = 0;
477  decp[0] = lua_getlocaledecpoint(); /* get decimal point from locale */
478  decp[1] = '.'; /* always accept a dot */
479  l_lockfile(rn.f);
480  do { rn.c = l_getc(rn.f); } while (isspace(rn.c)); /* skip spaces */
481  test2(&rn, "-+"); /* optional sign */
482  if (test2(&rn, "00")) {
483  if (test2(&rn, "xX")) hex = 1; /* numeral is hexadecimal */
484  else count = 1; /* count initial '0' as a valid digit */
485  }
486  count += readdigits(&rn, hex); /* integral part */
487  if (test2(&rn, decp)) /* decimal point? */
488  count += readdigits(&rn, hex); /* fractional part */
489  if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) { /* exponent mark? */
490  test2(&rn, "-+"); /* exponent sign */
491  readdigits(&rn, 0); /* exponent digits */
492  }
493  ungetc(rn.c, rn.f); /* unread look-ahead char */
494  l_unlockfile(rn.f);
495  rn.buff[rn.n] = '\0'; /* finish string */
496  if (lua_stringtonumber(L, rn.buff)) /* is this a valid number? */
497  return 1; /* ok */
498  else { /* invalid format */
499  lua_pushnil(L); /* "result" to be removed */
500  return 0; /* read fails */
501  }
502 }
503 
504 
505 static int test_eof (lua_State *L, FILE *f) {
506  int c = getc(f);
507  ungetc(c, f); /* no-op when c == EOF */
508  lua_pushliteral(L, "");
509  return (c != EOF);
510 }
511 
512 
513 static int read_line (lua_State *L, FILE *f, int chop) {
514  luaL_Buffer b;
515  int c;
516  luaL_buffinit(L, &b);
517  do { /* may need to read several chunks to get whole line */
518  char *buff = luaL_prepbuffer(&b); /* preallocate buffer space */
519  int i = 0;
520  l_lockfile(f); /* no memory errors can happen inside the lock */
521  while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')
522  buff[i++] = c; /* read up to end of line or buffer limit */
523  l_unlockfile(f);
524  luaL_addsize(&b, i);
525  } while (c != EOF && c != '\n'); /* repeat until end of line */
526  if (!chop && c == '\n') /* want a newline and have one? */
527  luaL_addchar(&b, c); /* add ending newline to result */
528  luaL_pushresult(&b); /* close buffer */
529  /* return ok if read something (either a newline or something else) */
530  return (c == '\n' || lua_rawlen(L, -1) > 0);
531 }
532 
533 
534 static void read_all (lua_State *L, FILE *f) {
535  size_t nr;
536  luaL_Buffer b;
537  luaL_buffinit(L, &b);
538  do { /* read file in chunks of LUAL_BUFFERSIZE bytes */
539  char *p = luaL_prepbuffer(&b);
540  nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);
541  luaL_addsize(&b, nr);
542  } while (nr == LUAL_BUFFERSIZE);
543  luaL_pushresult(&b); /* close buffer */
544 }
545 
546 
547 static int read_chars (lua_State *L, FILE *f, size_t n) {
548  size_t nr; /* number of chars actually read */
549  char *p;
550  luaL_Buffer b;
551  luaL_buffinit(L, &b);
552  p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */
553  nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */
554  luaL_addsize(&b, nr);
555  luaL_pushresult(&b); /* close buffer */
556  return (nr > 0); /* true iff read something */
557 }
558 
559 
560 static int g_read (lua_State *L, FILE *f, int first) {
561  int nargs = lua_gettop(L) - 1;
562  int n, success;
563  clearerr(f);
564  if (nargs == 0) { /* no arguments? */
565  success = read_line(L, f, 1);
566  n = first + 1; /* to return 1 result */
567  }
568  else {
569  /* ensure stack space for all results and for auxlib's buffer */
570  luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
571  success = 1;
572  for (n = first; nargs-- && success; n++) {
573  if (lua_type(L, n) == LUA_TNUMBER) {
574  size_t l = (size_t)luaL_checkinteger(L, n);
575  success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
576  }
577  else {
578  const char *p = luaL_checkstring(L, n);
579  if (*p == '*') p++; /* skip optional '*' (for compatibility) */
580  switch (*p) {
581  case 'n': /* number */
582  success = read_number(L, f);
583  break;
584  case 'l': /* line */
585  success = read_line(L, f, 1);
586  break;
587  case 'L': /* line with end-of-line */
588  success = read_line(L, f, 0);
589  break;
590  case 'a': /* file */
591  read_all(L, f); /* read entire file */
592  success = 1; /* always success */
593  break;
594  default:
595  return luaL_argerror(L, n, "invalid format");
596  }
597  }
598  }
599  }
600  if (ferror(f))
601  return luaL_fileresult(L, 0, NULL);
602  if (!success) {
603  lua_pop(L, 1); /* remove last result */
604  luaL_pushfail(L); /* push nil instead */
605  }
606  return n - first;
607 }
608 
609 
610 static int io_read (lua_State *L) {
611  return g_read(L, getiofile(L, IO_INPUT), 1);
612 }
613 
614 
615 static int f_read (lua_State *L) {
616  return g_read(L, tofile(L), 2);
617 }
618 
619 
620 /*
621 ** Iteration function for 'lines'.
622 */
623 static int io_readline (lua_State *L) {
625  int i;
626  int n = (int)lua_tointeger(L, lua_upvalueindex(2));
627  if (isclosed(p)) /* file is already closed? */
628  return luaL_error(L, "file is already closed");
629  lua_settop(L , 1);
630  luaL_checkstack(L, n, "too many arguments");
631  for (i = 1; i <= n; i++) /* push arguments to 'g_read' */
632  lua_pushvalue(L, lua_upvalueindex(3 + i));
633  n = g_read(L, p->f, 2); /* 'n' is number of results */
634  lua_assert(n > 0); /* should return at least a nil */
635  if (lua_toboolean(L, -n)) /* read at least one value? */
636  return n; /* return them */
637  else { /* first result is false: EOF or error */
638  if (n > 1) { /* is there error information? */
639  /* 2nd result is error message */
640  return luaL_error(L, "%s", lua_tostring(L, -n + 1));
641  }
642  if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */
643  lua_settop(L, 0); /* clear stack */
644  lua_pushvalue(L, lua_upvalueindex(1)); /* push file at index 1 */
645  aux_close(L); /* close it */
646  }
647  return 0;
648  }
649 }
650 
651 /* }====================================================== */
652 
653 
654 static int g_write (lua_State *L, FILE *f, int arg) {
655  int nargs = lua_gettop(L) - arg;
656  int status = 1;
657  for (; nargs--; arg++) {
658  if (lua_type(L, arg) == LUA_TNUMBER) {
659  /* optimization: could be done exactly as for strings */
660  int len = lua_isinteger(L, arg)
661  ? fprintf(f, LUA_INTEGER_FMT,
662  (LUAI_UACINT)lua_tointeger(L, arg))
663  : fprintf(f, LUA_NUMBER_FMT,
664  (LUAI_UACNUMBER)lua_tonumber(L, arg));
665  status = status && (len > 0);
666  }
667  else {
668  size_t l;
669  const char *s = luaL_checklstring(L, arg, &l);
670  status = status && (fwrite(s, sizeof(char), l, f) == l);
671  }
672  }
673  if (status) return 1; /* file handle already on stack top */
674  else return luaL_fileresult(L, status, NULL);
675 }
676 
677 
678 static int io_write (lua_State *L) {
679  return g_write(L, getiofile(L, IO_OUTPUT), 1);
680 }
681 
682 
683 static int f_write (lua_State *L) {
684  FILE *f = tofile(L);
685  lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
686  return g_write(L, f, 2);
687 }
688 
689 
690 static int f_seek (lua_State *L) {
691  static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
692  static const char *const modenames[] = {"set", "cur", "end", NULL};
693  FILE *f = tofile(L);
694  int op = luaL_checkoption(L, 2, "cur", modenames);
695  lua_Integer p3 = luaL_optinteger(L, 3, 0);
696  l_seeknum offset = (l_seeknum)p3;
697  luaL_argcheck(L, (lua_Integer)offset == p3, 3,
698  "not an integer in proper range");
699  op = l_fseek(f, offset, mode[op]);
700  if (op)
701  return luaL_fileresult(L, 0, NULL); /* error */
702  else {
704  return 1;
705  }
706 }
707 
708 
709 static int f_setvbuf (lua_State *L) {
710  static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
711  static const char *const modenames[] = {"no", "full", "line", NULL};
712  FILE *f = tofile(L);
713  int op = luaL_checkoption(L, 2, NULL, modenames);
715  int res = setvbuf(f, NULL, mode[op], (size_t)sz);
716  return luaL_fileresult(L, res == 0, NULL);
717 }
718 
719 
720 
721 static int io_flush (lua_State *L) {
722  return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
723 }
724 
725 
726 static int f_flush (lua_State *L) {
727  return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
728 }
729 
730 
731 /*
732 ** functions for 'io' library
733 */
734 static const luaL_Reg iolib[] = {
735  {"close", io_close},
736  {"flush", io_flush},
737  {"input", io_input},
738  {"lines", io_lines},
739  {"open", io_open},
740  {"output", io_output},
741  {"popen", io_popen},
742  {"read", io_read},
743  {"tmpfile", io_tmpfile},
744  {"type", io_type},
745  {"write", io_write},
746  {NULL, NULL}
747 };
748 
749 
750 /*
751 ** methods for file handles
752 */
753 static const luaL_Reg meth[] = {
754  {"read", f_read},
755  {"write", f_write},
756  {"lines", f_lines},
757  {"flush", f_flush},
758  {"seek", f_seek},
759  {"close", f_close},
760  {"setvbuf", f_setvbuf},
761  {NULL, NULL}
762 };
763 
764 
765 /*
766 ** metamethods for file handles
767 */
768 static const luaL_Reg metameth[] = {
769  {"__index", NULL}, /* place holder */
770  {"__gc", f_gc},
771  {"__close", f_gc},
772  {"__tostring", f_tostring},
773  {NULL, NULL}
774 };
775 
776 
777 static void createmeta (lua_State *L) {
778  luaL_newmetatable(L, LUA_FILEHANDLE); /* metatable for file handles */
779  luaL_setfuncs(L, metameth, 0); /* add metamethods to new metatable */
780  luaL_newlibtable(L, meth); /* create method table */
781  luaL_setfuncs(L, meth, 0); /* add file methods to method table */
782  lua_setfield(L, -2, "__index"); /* metatable.__index = method table */
783  lua_pop(L, 1); /* pop metatable */
784 }
785 
786 
787 /*
788 ** function to (not) close the standard files stdin, stdout, and stderr
789 */
790 static int io_noclose (lua_State *L) {
791  LStream *p = tolstream(L);
792  p->closef = &io_noclose; /* keep file opened */
793  luaL_pushfail(L);
794  lua_pushliteral(L, "cannot close standard file");
795  return 2;
796 }
797 
798 
799 static void createstdfile (lua_State *L, FILE *f, const char *k,
800  const char *fname) {
801  LStream *p = newprefile(L);
802  p->f = f;
803  p->closef = &io_noclose;
804  if (k != NULL) {
805  lua_pushvalue(L, -1);
806  lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */
807  }
808  lua_setfield(L, -2, fname); /* add file to module */
809 }
810 
811 
813  luaL_newlib(L, iolib); /* new module */
814  createmeta(L);
815  /* create (and set) default files */
816  createstdfile(L, stdin, IO_INPUT, "stdin");
817  createstdfile(L, stdout, IO_OUTPUT, "stdout");
818  createstdfile(L, stderr, NULL, "stderr");
819  return 1;
820 }
821 
#define luaL_addsize(B, s)
Definition: lauxlib.h:186
static int io_input(lua_State *L)
Definition: liolib.cpp:329
#define lua_isnoneornil(L, n)
Definition: lua.h:379
FILE * f
Definition: lauxlib.h:221
#define isclosed(p)
Definition: liolib.cpp:154
static int f_seek(lua_State *L)
Definition: liolib.cpp:690
static int io_close(lua_State *L)
Definition: liolib.cpp:222
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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#define luaL_pushfail(L)
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LUA_API void lua_pushboolean(lua_State *L, int b)
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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
Definition: liolib.cpp:144
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 lua_tointeger(L, i)
Definition: lua.h:362
#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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#define lua_pop(L, n)
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#define luaL_newlibtable(L, l)
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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)
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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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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:421
static int read_chars(lua_State *L, FILE *f, size_t n)
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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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static int io_output(lua_State *L)
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#define l_checkmodep(m)
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int n
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#define LUA_TNUMBER
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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[]
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#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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FILE * f
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#define LUA_NUMBER_FMT
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std::size_t i
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