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1 | /* |
2 | ** $Id: liolib.c,v 2.148 2015/11/23 11:36:11 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 | #define l_checkmode(mode) \ | |
41 | (*mode != '\0' && strchr("rwa", *(mode++)) != NULL && \ | |
42 | (*mode != '+' || (++mode, 1)) && /* skip if char is '+' */ \ | |
43 | (strspn(mode, L_MODEEXT) == strlen(mode))) | |
44 | ||
45 | #endif | |
46 | ||
47 | /* | |
48 | ** {====================================================== | |
49 | ** l_popen spawns a new process connected to the current | |
50 | ** one through the file streams. | |
51 | ** ======================================================= | |
52 | */ | |
53 | ||
54 | #if !defined(l_popen) /* { */ | |
55 | ||
56 | #if defined(LUA_USE_POSIX) /* { */ | |
57 | ||
58 | #define l_popen(L,c,m) (fflush(NULL), popen(c,m)) | |
59 | #define l_pclose(L,file) (pclose(file)) | |
60 | ||
61 | #elif defined(LUA_USE_WINDOWS) /* }{ */ | |
62 | ||
63 | #define l_popen(L,c,m) (_popen(c,m)) | |
64 | #define l_pclose(L,file) (_pclose(file)) | |
65 | ||
66 | #else /* }{ */ | |
67 | ||
68 | /* ISO C definitions */ | |
69 | #define l_popen(L,c,m) \ | |
70 | ((void)((void)c, m), \ | |
71 | luaL_error(L, "'popen' not supported"), \ | |
72 | (FILE*)0) | |
73 | #define l_pclose(L,file) ((void)L, (void)file, -1) | |
74 | ||
75 | #endif /* } */ | |
76 | ||
77 | #endif /* } */ | |
78 | ||
79 | /* }====================================================== */ | |
80 | ||
81 | ||
82 | #if !defined(l_getc) /* { */ | |
83 | ||
84 | #if defined(LUA_USE_POSIX) | |
85 | #define l_getc(f) getc_unlocked(f) | |
86 | #define l_lockfile(f) flockfile(f) | |
87 | #define l_unlockfile(f) funlockfile(f) | |
88 | #else | |
89 | #define l_getc(f) getc(f) | |
90 | #define l_lockfile(f) ((void)0) | |
91 | #define l_unlockfile(f) ((void)0) | |
92 | #endif | |
93 | ||
94 | #endif /* } */ | |
95 | ||
96 | ||
97 | /* | |
98 | ** {====================================================== | |
99 | ** l_fseek: configuration for longer offsets | |
100 | ** ======================================================= | |
101 | */ | |
102 | ||
103 | #if !defined(l_fseek) /* { */ | |
104 | ||
105 | #if defined(LUA_USE_POSIX) /* { */ | |
106 | ||
107 | #include <sys/types.h> | |
108 | ||
109 | #define l_fseek(f,o,w) fseeko(f,o,w) | |
110 | #define l_ftell(f) ftello(f) | |
111 | #define l_seeknum off_t | |
112 | ||
113 | #elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \ | |
114 | && defined(_MSC_VER) && (_MSC_VER >= 1400) /* }{ */ | |
115 | ||
116 | /* Windows (but not DDK) and Visual C++ 2005 or higher */ | |
117 | #define l_fseek(f,o,w) _fseeki64(f,o,w) | |
118 | #define l_ftell(f) _ftelli64(f) | |
119 | #define l_seeknum __int64 | |
120 | ||
121 | #else /* }{ */ | |
122 | ||
123 | /* ISO C definitions */ | |
124 | #define l_fseek(f,o,w) fseek(f,o,w) | |
125 | #define l_ftell(f) ftell(f) | |
126 | #define l_seeknum long | |
127 | ||
128 | #endif /* } */ | |
129 | ||
130 | #endif /* } */ | |
131 | ||
132 | /* }====================================================== */ | |
133 | ||
134 | ||
135 | #define IO_PREFIX "_IO_" | |
136 | #define IOPREF_LEN (sizeof(IO_PREFIX)/sizeof(char) - 1) | |
137 | #define IO_INPUT (IO_PREFIX "input") | |
138 | #define IO_OUTPUT (IO_PREFIX "output") | |
139 | ||
140 | ||
141 | typedef luaL_Stream LStream; | |
142 | ||
143 | ||
144 | #define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE)) | |
145 | ||
146 | #define isclosed(p) ((p)->closef == NULL) | |
147 | ||
148 | ||
149 | static int io_type (lua_State *L) { | |
150 | LStream *p; | |
151 | luaL_checkany(L, 1); | |
152 | p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE); | |
153 | if (p == NULL) | |
154 | lua_pushnil(L); /* not a file */ | |
155 | else if (isclosed(p)) | |
156 | lua_pushliteral(L, "closed file"); | |
157 | else | |
158 | lua_pushliteral(L, "file"); | |
159 | return 1; | |
160 | } | |
161 | ||
162 | ||
163 | static int f_tostring (lua_State *L) { | |
164 | LStream *p = tolstream(L); | |
165 | if (isclosed(p)) | |
166 | lua_pushliteral(L, "file (closed)"); | |
167 | else | |
168 | lua_pushfstring(L, "file (%p)", p->f); | |
169 | return 1; | |
170 | } | |
171 | ||
172 | ||
173 | static FILE *tofile (lua_State *L) { | |
174 | LStream *p = tolstream(L); | |
175 | if (isclosed(p)) | |
176 | luaL_error(L, "attempt to use a closed file"); | |
177 | lua_assert(p->f); | |
178 | return p->f; | |
179 | } | |
180 | ||
181 | ||
182 | /* | |
183 | ** When creating file handles, always creates a 'closed' file handle | |
184 | ** before opening the actual file; so, if there is a memory error, the | |
185 | ** handle is in a consistent state. | |
186 | */ | |
187 | static LStream *newprefile (lua_State *L) { | |
188 | LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream)); | |
189 | p->closef = NULL; /* mark file handle as 'closed' */ | |
190 | luaL_setmetatable(L, LUA_FILEHANDLE); | |
191 | return p; | |
192 | } | |
193 | ||
194 | ||
195 | /* | |
196 | ** Calls the 'close' function from a file handle. The 'volatile' avoids | |
197 | ** a bug in some versions of the Clang compiler (e.g., clang 3.0 for | |
198 | ** 32 bits). | |
199 | */ | |
200 | static int aux_close (lua_State *L) { | |
201 | LStream *p = tolstream(L); | |
202 | volatile lua_CFunction cf = p->closef; | |
203 | p->closef = NULL; /* mark stream as closed */ | |
204 | return (*cf)(L); /* close it */ | |
205 | } | |
206 | ||
207 | ||
208 | static int io_close (lua_State *L) { | |
209 | if (lua_isnone(L, 1)) /* no argument? */ | |
210 | lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use standard output */ | |
211 | tofile(L); /* make sure argument is an open stream */ | |
212 | return aux_close(L); | |
213 | } | |
214 | ||
215 | ||
216 | static int f_gc (lua_State *L) { | |
217 | LStream *p = tolstream(L); | |
218 | if (!isclosed(p) && p->f != NULL) | |
219 | aux_close(L); /* ignore closed and incompletely open files */ | |
220 | return 0; | |
221 | } | |
222 | ||
223 | ||
224 | /* | |
225 | ** function to close regular files | |
226 | */ | |
227 | static int io_fclose (lua_State *L) { | |
228 | LStream *p = tolstream(L); | |
229 | int res = fclose(p->f); | |
230 | return luaL_fileresult(L, (res == 0), NULL); | |
231 | } | |
232 | ||
233 | ||
234 | static LStream *newfile (lua_State *L) { | |
235 | LStream *p = newprefile(L); | |
236 | p->f = NULL; | |
237 | p->closef = &io_fclose; | |
238 | return p; | |
239 | } | |
240 | ||
241 | ||
242 | static void opencheck (lua_State *L, const char *fname, const char *mode) { | |
243 | LStream *p = newfile(L); | |
244 | p->f = fopen(fname, mode); | |
245 | if (p->f == NULL) | |
246 | luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno)); | |
247 | } | |
248 | ||
249 | ||
250 | static int io_open (lua_State *L) { | |
251 | const char *filename = luaL_checkstring(L, 1); | |
252 | const char *mode = luaL_optstring(L, 2, "r"); | |
253 | LStream *p = newfile(L); | |
254 | const char *md = mode; /* to traverse/check mode */ | |
255 | luaL_argcheck(L, l_checkmode(md), 2, "invalid mode"); | |
256 | p->f = fopen(filename, mode); | |
257 | return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1; | |
258 | } | |
259 | ||
260 | ||
261 | /* | |
262 | ** function to close 'popen' files | |
263 | */ | |
264 | static int io_pclose (lua_State *L) { | |
265 | LStream *p = tolstream(L); | |
266 | return luaL_execresult(L, l_pclose(L, p->f)); | |
267 | } | |
268 | ||
269 | ||
270 | static int io_popen (lua_State *L) { | |
271 | const char *filename = luaL_checkstring(L, 1); | |
272 | const char *mode = luaL_optstring(L, 2, "r"); | |
273 | LStream *p = newprefile(L); | |
274 | p->f = l_popen(L, filename, mode); | |
275 | p->closef = &io_pclose; | |
276 | return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1; | |
277 | } | |
278 | ||
279 | ||
280 | static int io_tmpfile (lua_State *L) { | |
281 | LStream *p = newfile(L); | |
282 | p->f = tmpfile(); | |
283 | return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1; | |
284 | } | |
285 | ||
286 | ||
287 | static FILE *getiofile (lua_State *L, const char *findex) { | |
288 | LStream *p; | |
289 | lua_getfield(L, LUA_REGISTRYINDEX, findex); | |
290 | p = (LStream *)lua_touserdata(L, -1); | |
291 | if (isclosed(p)) | |
292 | luaL_error(L, "standard %s file is closed", findex + IOPREF_LEN); | |
293 | return p->f; | |
294 | } | |
295 | ||
296 | ||
297 | static int g_iofile (lua_State *L, const char *f, const char *mode) { | |
298 | if (!lua_isnoneornil(L, 1)) { | |
299 | const char *filename = lua_tostring(L, 1); | |
300 | if (filename) | |
301 | opencheck(L, filename, mode); | |
302 | else { | |
303 | tofile(L); /* check that it's a valid file handle */ | |
304 | lua_pushvalue(L, 1); | |
305 | } | |
306 | lua_setfield(L, LUA_REGISTRYINDEX, f); | |
307 | } | |
308 | /* return current value */ | |
309 | lua_getfield(L, LUA_REGISTRYINDEX, f); | |
310 | return 1; | |
311 | } | |
312 | ||
313 | ||
314 | static int io_input (lua_State *L) { | |
315 | return g_iofile(L, IO_INPUT, "r"); | |
316 | } | |
317 | ||
318 | ||
319 | static int io_output (lua_State *L) { | |
320 | return g_iofile(L, IO_OUTPUT, "w"); | |
321 | } | |
322 | ||
323 | ||
324 | static int io_readline (lua_State *L); | |
325 | ||
326 | ||
327 | /* | |
328 | ** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit | |
329 | ** in the limit for upvalues of a closure) | |
330 | */ | |
331 | #define MAXARGLINE 250 | |
332 | ||
333 | static void aux_lines (lua_State *L, int toclose) { | |
334 | int n = lua_gettop(L) - 1; /* number of arguments to read */ | |
335 | luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments"); | |
336 | lua_pushinteger(L, n); /* number of arguments to read */ | |
337 | lua_pushboolean(L, toclose); /* close/not close file when finished */ | |
338 | lua_rotate(L, 2, 2); /* move 'n' and 'toclose' to their positions */ | |
339 | lua_pushcclosure(L, io_readline, 3 + n); | |
340 | } | |
341 | ||
342 | ||
343 | static int f_lines (lua_State *L) { | |
344 | tofile(L); /* check that it's a valid file handle */ | |
345 | aux_lines(L, 0); | |
346 | return 1; | |
347 | } | |
348 | ||
349 | ||
350 | static int io_lines (lua_State *L) { | |
351 | int toclose; | |
352 | if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */ | |
353 | if (lua_isnil(L, 1)) { /* no file name? */ | |
354 | lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */ | |
355 | lua_replace(L, 1); /* put it at index 1 */ | |
356 | tofile(L); /* check that it's a valid file handle */ | |
357 | toclose = 0; /* do not close it after iteration */ | |
358 | } | |
359 | else { /* open a new file */ | |
360 | const char *filename = luaL_checkstring(L, 1); | |
361 | opencheck(L, filename, "r"); | |
362 | lua_replace(L, 1); /* put file at index 1 */ | |
363 | toclose = 1; /* close it after iteration */ | |
364 | } | |
365 | aux_lines(L, toclose); | |
366 | return 1; | |
367 | } | |
368 | ||
369 | ||
370 | /* | |
371 | ** {====================================================== | |
372 | ** READ | |
373 | ** ======================================================= | |
374 | */ | |
375 | ||
376 | ||
377 | /* maximum length of a numeral */ | |
378 | #define MAXRN 200 | |
379 | ||
380 | /* auxiliary structure used by 'read_number' */ | |
381 | typedef struct { | |
382 | FILE *f; /* file being read */ | |
383 | int c; /* current character (look ahead) */ | |
384 | int n; /* number of elements in buffer 'buff' */ | |
385 | char buff[MAXRN + 1]; /* +1 for ending '\0' */ | |
386 | } RN; | |
387 | ||
388 | ||
389 | /* | |
390 | ** Add current char to buffer (if not out of space) and read next one | |
391 | */ | |
392 | static int nextc (RN *rn) { | |
393 | if (rn->n >= MAXRN) { /* buffer overflow? */ | |
394 | rn->buff[0] = '\0'; /* invalidate result */ | |
395 | return 0; /* fail */ | |
396 | } | |
397 | else { | |
398 | rn->buff[rn->n++] = rn->c; /* save current char */ | |
399 | rn->c = l_getc(rn->f); /* read next one */ | |
400 | return 1; | |
401 | } | |
402 | } | |
403 | ||
404 | ||
405 | /* | |
406 | ** Accept current char if it is in 'set' (of size 1 or 2) | |
407 | */ | |
408 | static int test2 (RN *rn, const char *set) { | |
409 | if (rn->c == set[0] || (rn->c == set[1] && rn->c != '\0')) | |
410 | return nextc(rn); | |
411 | else return 0; | |
412 | } | |
413 | ||
414 | ||
415 | /* | |
416 | ** Read a sequence of (hex)digits | |
417 | */ | |
418 | static int readdigits (RN *rn, int hex) { | |
419 | int count = 0; | |
420 | while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn)) | |
421 | count++; | |
422 | return count; | |
423 | } | |
424 | ||
425 | ||
426 | /* | |
427 | ** Read a number: first reads a valid prefix of a numeral into a buffer. | |
428 | ** Then it calls 'lua_stringtonumber' to check whether the format is | |
429 | ** correct and to convert it to a Lua number | |
430 | */ | |
431 | static int read_number (lua_State *L, FILE *f) { | |
432 | RN rn; | |
433 | int count = 0; | |
434 | int hex = 0; | |
435 | char decp[2]; | |
436 | rn.f = f; rn.n = 0; | |
437 | decp[0] = lua_getlocaledecpoint(); /* get decimal point from locale */ | |
438 | decp[1] = '\0'; | |
439 | l_lockfile(rn.f); | |
440 | do { rn.c = l_getc(rn.f); } while (isspace(rn.c)); /* skip spaces */ | |
441 | test2(&rn, "-+"); /* optional signal */ | |
442 | if (test2(&rn, "0")) { | |
443 | if (test2(&rn, "xX")) hex = 1; /* numeral is hexadecimal */ | |
444 | else count = 1; /* count initial '0' as a valid digit */ | |
445 | } | |
446 | count += readdigits(&rn, hex); /* integral part */ | |
447 | if (test2(&rn, decp)) /* decimal point? */ | |
448 | count += readdigits(&rn, hex); /* fractional part */ | |
449 | if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) { /* exponent mark? */ | |
450 | test2(&rn, "-+"); /* exponent signal */ | |
451 | readdigits(&rn, 0); /* exponent digits */ | |
452 | } | |
453 | ungetc(rn.c, rn.f); /* unread look-ahead char */ | |
454 | l_unlockfile(rn.f); | |
455 | rn.buff[rn.n] = '\0'; /* finish string */ | |
456 | if (lua_stringtonumber(L, rn.buff)) /* is this a valid number? */ | |
457 | return 1; /* ok */ | |
458 | else { /* invalid format */ | |
459 | lua_pushnil(L); /* "result" to be removed */ | |
460 | return 0; /* read fails */ | |
461 | } | |
462 | } | |
463 | ||
464 | ||
465 | static int test_eof (lua_State *L, FILE *f) { | |
466 | int c = getc(f); | |
467 | ungetc(c, f); /* no-op when c == EOF */ | |
468 | lua_pushliteral(L, ""); | |
469 | return (c != EOF); | |
470 | } | |
471 | ||
472 | ||
473 | static int read_line (lua_State *L, FILE *f, int chop) { | |
474 | luaL_Buffer b; | |
475 | int c = '\0'; | |
476 | luaL_buffinit(L, &b); | |
477 | while (c != EOF && c != '\n') { /* repeat until end of line */ | |
478 | char *buff = luaL_prepbuffer(&b); /* preallocate buffer */ | |
479 | int i = 0; | |
480 | l_lockfile(f); /* no memory errors can happen inside the lock */ | |
481 | while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n') | |
482 | buff[i++] = c; | |
483 | l_unlockfile(f); | |
484 | luaL_addsize(&b, i); | |
485 | } | |
486 | if (!chop && c == '\n') /* want a newline and have one? */ | |
487 | luaL_addchar(&b, c); /* add ending newline to result */ | |
488 | luaL_pushresult(&b); /* close buffer */ | |
489 | /* return ok if read something (either a newline or something else) */ | |
490 | return (c == '\n' || lua_rawlen(L, -1) > 0); | |
491 | } | |
492 | ||
493 | ||
494 | static void read_all (lua_State *L, FILE *f) { | |
495 | size_t nr; | |
496 | luaL_Buffer b; | |
497 | luaL_buffinit(L, &b); | |
498 | do { /* read file in chunks of LUAL_BUFFERSIZE bytes */ | |
499 | char *p = luaL_prepbuffer(&b); | |
500 | nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f); | |
501 | luaL_addsize(&b, nr); | |
502 | } while (nr == LUAL_BUFFERSIZE); | |
503 | luaL_pushresult(&b); /* close buffer */ | |
504 | } | |
505 | ||
506 | ||
507 | static int read_chars (lua_State *L, FILE *f, size_t n) { | |
508 | size_t nr; /* number of chars actually read */ | |
509 | char *p; | |
510 | luaL_Buffer b; | |
511 | luaL_buffinit(L, &b); | |
512 | p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */ | |
513 | nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */ | |
514 | luaL_addsize(&b, nr); | |
515 | luaL_pushresult(&b); /* close buffer */ | |
516 | return (nr > 0); /* true iff read something */ | |
517 | } | |
518 | ||
519 | ||
520 | static int g_read (lua_State *L, FILE *f, int first) { | |
521 | int nargs = lua_gettop(L) - 1; | |
522 | int success; | |
523 | int n; | |
524 | clearerr(f); | |
525 | if (nargs == 0) { /* no arguments? */ | |
526 | success = read_line(L, f, 1); | |
527 | n = first+1; /* to return 1 result */ | |
528 | } | |
529 | else { /* ensure stack space for all results and for auxlib's buffer */ | |
530 | luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments"); | |
531 | success = 1; | |
532 | for (n = first; nargs-- && success; n++) { | |
533 | if (lua_type(L, n) == LUA_TNUMBER) { | |
534 | size_t l = (size_t)luaL_checkinteger(L, n); | |
535 | success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l); | |
536 | } | |
537 | else { | |
538 | const char *p = luaL_checkstring(L, n); | |
539 | if (*p == '*') p++; /* skip optional '*' (for compatibility) */ | |
540 | switch (*p) { | |
541 | case 'n': /* number */ | |
542 | success = read_number(L, f); | |
543 | break; | |
544 | case 'l': /* line */ | |
545 | success = read_line(L, f, 1); | |
546 | break; | |
547 | case 'L': /* line with end-of-line */ | |
548 | success = read_line(L, f, 0); | |
549 | break; | |
550 | case 'a': /* file */ | |
551 | read_all(L, f); /* read entire file */ | |
552 | success = 1; /* always success */ | |
553 | break; | |
554 | default: | |
555 | return luaL_argerror(L, n, "invalid format"); | |
556 | } | |
557 | } | |
558 | } | |
559 | } | |
560 | if (ferror(f)) | |
561 | return luaL_fileresult(L, 0, NULL); | |
562 | if (!success) { | |
563 | lua_pop(L, 1); /* remove last result */ | |
564 | lua_pushnil(L); /* push nil instead */ | |
565 | } | |
566 | return n - first; | |
567 | } | |
568 | ||
569 | ||
570 | static int io_read (lua_State *L) { | |
571 | return g_read(L, getiofile(L, IO_INPUT), 1); | |
572 | } | |
573 | ||
574 | ||
575 | static int f_read (lua_State *L) { | |
576 | return g_read(L, tofile(L), 2); | |
577 | } | |
578 | ||
579 | ||
580 | static int io_readline (lua_State *L) { | |
581 | LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1)); | |
582 | int i; | |
583 | int n = (int)lua_tointeger(L, lua_upvalueindex(2)); | |
584 | if (isclosed(p)) /* file is already closed? */ | |
585 | return luaL_error(L, "file is already closed"); | |
586 | lua_settop(L , 1); | |
587 | luaL_checkstack(L, n, "too many arguments"); | |
588 | for (i = 1; i <= n; i++) /* push arguments to 'g_read' */ | |
589 | lua_pushvalue(L, lua_upvalueindex(3 + i)); | |
590 | n = g_read(L, p->f, 2); /* 'n' is number of results */ | |
591 | lua_assert(n > 0); /* should return at least a nil */ | |
592 | if (lua_toboolean(L, -n)) /* read at least one value? */ | |
593 | return n; /* return them */ | |
594 | else { /* first result is nil: EOF or error */ | |
595 | if (n > 1) { /* is there error information? */ | |
596 | /* 2nd result is error message */ | |
597 | return luaL_error(L, "%s", lua_tostring(L, -n + 1)); | |
598 | } | |
599 | if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */ | |
600 | lua_settop(L, 0); | |
601 | lua_pushvalue(L, lua_upvalueindex(1)); | |
602 | aux_close(L); /* close it */ | |
603 | } | |
604 | return 0; | |
605 | } | |
606 | } | |
607 | ||
608 | /* }====================================================== */ | |
609 | ||
610 | ||
611 | static int g_write (lua_State *L, FILE *f, int arg) { | |
612 | int nargs = lua_gettop(L) - arg; | |
613 | int status = 1; | |
614 | for (; nargs--; arg++) { | |
615 | if (lua_type(L, arg) == LUA_TNUMBER) { | |
616 | /* optimization: could be done exactly as for strings */ | |
617 | int len = lua_isinteger(L, arg) | |
618 | ? fprintf(f, LUA_INTEGER_FMT, lua_tointeger(L, arg)) | |
619 | : fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)); | |
620 | status = status && (len > 0); | |
621 | } | |
622 | else { | |
623 | size_t l; | |
624 | const char *s = luaL_checklstring(L, arg, &l); | |
625 | status = status && (fwrite(s, sizeof(char), l, f) == l); | |
626 | } | |
627 | } | |
628 | if (status) return 1; /* file handle already on stack top */ | |
629 | else return luaL_fileresult(L, status, NULL); | |
630 | } | |
631 | ||
632 | ||
633 | static int io_write (lua_State *L) { | |
634 | return g_write(L, getiofile(L, IO_OUTPUT), 1); | |
635 | } | |
636 | ||
637 | ||
638 | static int f_write (lua_State *L) { | |
639 | FILE *f = tofile(L); | |
640 | lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */ | |
641 | return g_write(L, f, 2); | |
642 | } | |
643 | ||
644 | ||
645 | static int f_seek (lua_State *L) { | |
646 | static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END}; | |
647 | static const char *const modenames[] = {"set", "cur", "end", NULL}; | |
648 | FILE *f = tofile(L); | |
649 | int op = luaL_checkoption(L, 2, "cur", modenames); | |
650 | lua_Integer p3 = luaL_optinteger(L, 3, 0); | |
651 | l_seeknum offset = (l_seeknum)p3; | |
652 | luaL_argcheck(L, (lua_Integer)offset == p3, 3, | |
653 | "not an integer in proper range"); | |
654 | op = l_fseek(f, offset, mode[op]); | |
655 | if (op) | |
656 | return luaL_fileresult(L, 0, NULL); /* error */ | |
657 | else { | |
658 | lua_pushinteger(L, (lua_Integer)l_ftell(f)); | |
659 | return 1; | |
660 | } | |
661 | } | |
662 | ||
663 | ||
664 | static int f_setvbuf (lua_State *L) { | |
665 | static const int mode[] = {_IONBF, _IOFBF, _IOLBF}; | |
666 | static const char *const modenames[] = {"no", "full", "line", NULL}; | |
667 | FILE *f = tofile(L); | |
668 | int op = luaL_checkoption(L, 2, NULL, modenames); | |
669 | lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE); | |
670 | int res = setvbuf(f, NULL, mode[op], (size_t)sz); | |
671 | return luaL_fileresult(L, res == 0, NULL); | |
672 | } | |
673 | ||
674 | ||
675 | ||
676 | static int io_flush (lua_State *L) { | |
677 | return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL); | |
678 | } | |
679 | ||
680 | ||
681 | static int f_flush (lua_State *L) { | |
682 | return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL); | |
683 | } | |
684 | ||
685 | ||
686 | /* | |
687 | ** functions for 'io' library | |
688 | */ | |
689 | static const luaL_Reg iolib[] = { | |
690 | {"close", io_close}, | |
691 | {"flush", io_flush}, | |
692 | {"input", io_input}, | |
693 | {"lines", io_lines}, | |
694 | {"open", io_open}, | |
695 | {"output", io_output}, | |
696 | {"popen", io_popen}, | |
697 | {"read", io_read}, | |
698 | {"tmpfile", io_tmpfile}, | |
699 | {"type", io_type}, | |
700 | {"write", io_write}, | |
701 | {NULL, NULL} | |
702 | }; | |
703 | ||
704 | ||
705 | /* | |
706 | ** methods for file handles | |
707 | */ | |
708 | static const luaL_Reg flib[] = { | |
709 | {"close", io_close}, | |
710 | {"flush", f_flush}, | |
711 | {"lines", f_lines}, | |
712 | {"read", f_read}, | |
713 | {"seek", f_seek}, | |
714 | {"setvbuf", f_setvbuf}, | |
715 | {"write", f_write}, | |
716 | {"__gc", f_gc}, | |
717 | {"__tostring", f_tostring}, | |
718 | {NULL, NULL} | |
719 | }; | |
720 | ||
721 | ||
722 | static void createmeta (lua_State *L) { | |
723 | luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */ | |
724 | lua_pushvalue(L, -1); /* push metatable */ | |
725 | lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */ | |
726 | luaL_setfuncs(L, flib, 0); /* add file methods to new metatable */ | |
727 | lua_pop(L, 1); /* pop new metatable */ | |
728 | } | |
729 | ||
730 | ||
731 | /* | |
732 | ** function to (not) close the standard files stdin, stdout, and stderr | |
733 | */ | |
734 | static int io_noclose (lua_State *L) { | |
735 | LStream *p = tolstream(L); | |
736 | p->closef = &io_noclose; /* keep file opened */ | |
737 | lua_pushnil(L); | |
738 | lua_pushliteral(L, "cannot close standard file"); | |
739 | return 2; | |
740 | } | |
741 | ||
742 | ||
743 | static void createstdfile (lua_State *L, FILE *f, const char *k, | |
744 | const char *fname) { | |
745 | LStream *p = newprefile(L); | |
746 | p->f = f; | |
747 | p->closef = &io_noclose; | |
748 | if (k != NULL) { | |
749 | lua_pushvalue(L, -1); | |
750 | lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */ | |
751 | } | |
752 | lua_setfield(L, -2, fname); /* add file to module */ | |
753 | } | |
754 | ||
755 | ||
756 | LUAMOD_API int luaopen_io (lua_State *L) { | |
757 | luaL_newlib(L, iolib); /* new module */ | |
758 | createmeta(L); | |
759 | /* create (and set) default files */ | |
760 | createstdfile(L, stdin, IO_INPUT, "stdin"); | |
761 | createstdfile(L, stdout, IO_OUTPUT, "stdout"); | |
762 | createstdfile(L, stderr, NULL, "stderr"); | |
763 | return 1; | |
764 | } | |
765 |