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- Committer: Evan Broder
- Date: 2010-11-09 04:26:42 UTC
- Revision ID: evan@ebroder.net-20101109042642-pmjtl9t4ev9r38no
Enable lua from grub-extras.
- files added:
- debian/grub-extras/lua
- debian/grub-extras/lua/conf
- files modified:
- debian/changelog
added
removed
debian/grub-extras/lua/liolib.c
1
/*
2
** $Id: liolib.c,v 2.73.1.3 2008/01/18 17:47:43 roberto Exp $
3
** Standard I/O (and system) library
4
** See Copyright Notice in lua.h
5
*/
6
7
8
#include <errno.h>
9
#include <stdio.h>
10
#include <stdlib.h>
11
#include <string.h>
12
13
#define liolib_c
14
#define LUA_LIB
15
16
#include "lua.h"
17
18
#include "lauxlib.h"
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#include "lualib.h"
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#define IO_INPUT 1
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#define IO_OUTPUT 2
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26
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static const char *const fnames[] = {"input", "output"};
28
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static int pushresult (lua_State *L, int i, const char *filename) {
31
int en = errno; /* calls to Lua API may change this value */
32
if (i) {
33
lua_pushboolean(L, 1);
34
return 1;
35
}
36
else {
37
lua_pushnil(L);
38
if (filename)
39
lua_pushfstring(L, "%s: %s", filename, strerror(en));
40
else
41
lua_pushfstring(L, "%s", strerror(en));
42
lua_pushinteger(L, en);
43
return 3;
44
}
45
}
46
47
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static void fileerror (lua_State *L, int arg, const char *filename) {
49
lua_pushfstring(L, "%s: %s", filename, strerror(errno));
50
luaL_argerror(L, arg, lua_tostring(L, -1));
51
}
52
53
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#define tofilep(L) ((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
55
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static int io_type (lua_State *L) {
58
void *ud;
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luaL_checkany(L, 1);
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ud = lua_touserdata(L, 1);
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lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
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if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
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lua_pushnil(L); /* not a file */
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else if (*((FILE **)ud) == NULL)
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lua_pushliteral(L, "closed file");
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else
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lua_pushliteral(L, "file");
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return 1;
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}
70
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static FILE *tofile (lua_State *L) {
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FILE **f = tofilep(L);
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if (*f == NULL)
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luaL_error(L, "attempt to use a closed file");
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return *f;
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}
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/*
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** When creating file handles, always creates a `closed' file handle
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** before opening the actual file; so, if there is a memory error, the
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** file is not left opened.
85
*/
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static FILE **newfile (lua_State *L) {
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FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
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*pf = NULL; /* file handle is currently `closed' */
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luaL_getmetatable(L, LUA_FILEHANDLE);
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lua_setmetatable(L, -2);
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return pf;
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}
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/*
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** function to (not) close the standard files stdin, stdout, and stderr
97
*/
98
static int io_noclose (lua_State *L) {
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lua_pushnil(L);
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lua_pushliteral(L, "cannot close standard file");
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return 2;
102
}
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104
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/*
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** function to close 'popen' files
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*/
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static int io_pclose (lua_State *L) {
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FILE **p = tofilep(L);
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int ok = lua_pclose(L, *p);
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*p = NULL;
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return pushresult(L, ok, NULL);
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}
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/*
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** function to close regular files
118
*/
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static int io_fclose (lua_State *L) {
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FILE **p = tofilep(L);
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int ok = (fclose(*p) == 0);
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*p = NULL;
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return pushresult(L, ok, NULL);
124
}
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static int aux_close (lua_State *L) {
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lua_getfenv(L, 1);
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lua_getfield(L, -1, "__close");
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return (lua_tocfunction(L, -1))(L);
131
}
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static int io_close (lua_State *L) {
135
if (lua_isnone(L, 1))
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lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
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tofile(L); /* make sure argument is a file */
138
return aux_close(L);
139
}
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static int io_gc (lua_State *L) {
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FILE *f = *tofilep(L);
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/* ignore closed files */
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if (f != NULL)
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aux_close(L);
147
return 0;
148
}
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150
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static int io_tostring (lua_State *L) {
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FILE *f = *tofilep(L);
153
if (f == NULL)
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lua_pushliteral(L, "file (closed)");
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else
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lua_pushfstring(L, "file (%p)", f);
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return 1;
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}
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static int io_open (lua_State *L) {
162
const char *filename = luaL_checkstring(L, 1);
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const char *mode = luaL_optstring(L, 2, "r");
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FILE **pf = newfile(L);
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*pf = fopen(filename, mode);
166
return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
167
}
168
169
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/*
171
** this function has a separated environment, which defines the
172
** correct __close for 'popen' files
173
*/
174
static int io_popen (lua_State *L) {
175
const char *filename = luaL_checkstring(L, 1);
176
const char *mode = luaL_optstring(L, 2, "r");
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FILE **pf = newfile(L);
178
*pf = lua_popen(L, filename, mode);
179
return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
180
}
181
182
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static int io_tmpfile (lua_State *L) {
184
FILE **pf = newfile(L);
185
*pf = tmpfile();
186
return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
187
}
188
189
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static FILE *getiofile (lua_State *L, int findex) {
191
FILE *f;
192
lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
193
f = *(FILE **)lua_touserdata(L, -1);
194
if (f == NULL)
195
luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
196
return f;
197
}
198
199
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static int g_iofile (lua_State *L, int f, const char *mode) {
201
if (!lua_isnoneornil(L, 1)) {
202
const char *filename = lua_tostring(L, 1);
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if (filename) {
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FILE **pf = newfile(L);
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*pf = fopen(filename, mode);
206
if (*pf == NULL)
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fileerror(L, 1, filename);
208
}
209
else {
210
tofile(L); /* check that it's a valid file handle */
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lua_pushvalue(L, 1);
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}
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lua_rawseti(L, LUA_ENVIRONINDEX, f);
214
}
215
/* return current value */
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lua_rawgeti(L, LUA_ENVIRONINDEX, f);
217
return 1;
218
}
219
220
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static int io_input (lua_State *L) {
222
return g_iofile(L, IO_INPUT, "r");
223
}
224
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static int io_output (lua_State *L) {
227
return g_iofile(L, IO_OUTPUT, "w");
228
}
229
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static int io_readline (lua_State *L);
232
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static void aux_lines (lua_State *L, int idx, int toclose) {
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lua_pushvalue(L, idx);
236
lua_pushboolean(L, toclose); /* close/not close file when finished */
237
lua_pushcclosure(L, io_readline, 2);
238
}
239
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static int f_lines (lua_State *L) {
242
tofile(L); /* check that it's a valid file handle */
243
aux_lines(L, 1, 0);
244
return 1;
245
}
246
247
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static int io_lines (lua_State *L) {
249
if (lua_isnoneornil(L, 1)) { /* no arguments? */
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/* will iterate over default input */
251
lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
252
return f_lines(L);
253
}
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else {
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const char *filename = luaL_checkstring(L, 1);
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FILE **pf = newfile(L);
257
*pf = fopen(filename, "r");
258
if (*pf == NULL)
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fileerror(L, 1, filename);
260
aux_lines(L, lua_gettop(L), 1);
261
return 1;
262
}
263
}
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/*
267
** {======================================================
268
** READ
269
** =======================================================
270
*/
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static int read_number (lua_State *L, FILE *f) {
274
lua_Number d;
275
if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
276
lua_pushnumber(L, d);
277
return 1;
278
}
279
else return 0; /* read fails */
280
}
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static int test_eof (lua_State *L, FILE *f) {
284
int c = getc(f);
285
ungetc(c, f);
286
lua_pushlstring(L, NULL, 0);
287
return (c != EOF);
288
}
289
290
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static int read_line (lua_State *L, FILE *f) {
292
luaL_Buffer b;
293
luaL_buffinit(L, &b);
294
for (;;) {
295
size_t l;
296
char *p = luaL_prepbuffer(&b);
297
if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
298
luaL_pushresult(&b); /* close buffer */
299
return (lua_objlen(L, -1) > 0); /* check whether read something */
300
}
301
l = strlen(p);
302
if (l == 0 || p[l-1] != '\n')
303
luaL_addsize(&b, l);
304
else {
305
luaL_addsize(&b, l - 1); /* do not include `eol' */
306
luaL_pushresult(&b); /* close buffer */
307
return 1; /* read at least an `eol' */
308
}
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}
310
}
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static int read_chars (lua_State *L, FILE *f, size_t n) {
314
size_t rlen; /* how much to read */
315
size_t nr; /* number of chars actually read */
316
luaL_Buffer b;
317
luaL_buffinit(L, &b);
318
rlen = LUAL_BUFFERSIZE; /* try to read that much each time */
319
do {
320
char *p = luaL_prepbuffer(&b);
321
if (rlen > n) rlen = n; /* cannot read more than asked */
322
nr = fread(p, sizeof(char), rlen, f);
323
luaL_addsize(&b, nr);
324
n -= nr; /* still have to read `n' chars */
325
} while (n > 0 && nr == rlen); /* until end of count or eof */
326
luaL_pushresult(&b); /* close buffer */
327
return (n == 0 || lua_objlen(L, -1) > 0);
328
}
329
330
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static int g_read (lua_State *L, FILE *f, int first) {
332
int nargs = lua_gettop(L) - 1;
333
int success;
334
int n;
335
clearerr(f);
336
if (nargs == 0) { /* no arguments? */
337
success = read_line(L, f);
338
n = first+1; /* to return 1 result */
339
}
340
else { /* ensure stack space for all results and for auxlib's buffer */
341
luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
342
success = 1;
343
for (n = first; nargs-- && success; n++) {
344
if (lua_type(L, n) == LUA_TNUMBER) {
345
size_t l = (size_t)lua_tointeger(L, n);
346
success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
347
}
348
else {
349
const char *p = lua_tostring(L, n);
350
luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
351
switch (p[1]) {
352
case 'n': /* number */
353
success = read_number(L, f);
354
break;
355
case 'l': /* line */
356
success = read_line(L, f);
357
break;
358
case 'a': /* file */
359
read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */
360
success = 1; /* always success */
361
break;
362
default:
363
return luaL_argerror(L, n, "invalid format");
364
}
365
}
366
}
367
}
368
if (ferror(f))
369
return pushresult(L, 0, NULL);
370
if (!success) {
371
lua_pop(L, 1); /* remove last result */
372
lua_pushnil(L); /* push nil instead */
373
}
374
return n - first;
375
}
376
377
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static int io_read (lua_State *L) {
379
return g_read(L, getiofile(L, IO_INPUT), 1);
380
}
381
382
383
static int f_read (lua_State *L) {
384
return g_read(L, tofile(L), 2);
385
}
386
387
388
static int io_readline (lua_State *L) {
389
FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
390
int sucess;
391
if (f == NULL) /* file is already closed? */
392
luaL_error(L, "file is already closed");
393
sucess = read_line(L, f);
394
if (ferror(f))
395
return luaL_error(L, "%s", strerror(errno));
396
if (sucess) return 1;
397
else { /* EOF */
398
if (lua_toboolean(L, lua_upvalueindex(2))) { /* generator created file? */
399
lua_settop(L, 0);
400
lua_pushvalue(L, lua_upvalueindex(1));
401
aux_close(L); /* close it */
402
}
403
return 0;
404
}
405
}
406
407
/* }====================================================== */
408
409
410
static int g_write (lua_State *L, FILE *f, int arg) {
411
int nargs = lua_gettop(L) - 1;
412
int status = 1;
413
for (; nargs--; arg++) {
414
if (lua_type(L, arg) == LUA_TNUMBER) {
415
/* optimization: could be done exactly as for strings */
416
status = status &&
417
fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
418
}
419
else {
420
size_t l;
421
const char *s = luaL_checklstring(L, arg, &l);
422
status = status && (fwrite(s, sizeof(char), l, f) == l);
423
}
424
}
425
return pushresult(L, status, NULL);
426
}
427
428
429
static int io_write (lua_State *L) {
430
return g_write(L, getiofile(L, IO_OUTPUT), 1);
431
}
432
433
434
static int f_write (lua_State *L) {
435
return g_write(L, tofile(L), 2);
436
}
437
438
439
static int f_seek (lua_State *L) {
440
static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
441
static const char *const modenames[] = {"set", "cur", "end", NULL};
442
FILE *f = tofile(L);
443
int op = luaL_checkoption(L, 2, "cur", modenames);
444
long offset = luaL_optlong(L, 3, 0);
445
op = fseek(f, offset, mode[op]);
446
if (op)
447
return pushresult(L, 0, NULL); /* error */
448
else {
449
lua_pushinteger(L, ftell(f));
450
return 1;
451
}
452
}
453
454
455
static int f_setvbuf (lua_State *L) {
456
static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
457
static const char *const modenames[] = {"no", "full", "line", NULL};
458
FILE *f = tofile(L);
459
int op = luaL_checkoption(L, 2, NULL, modenames);
460
lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
461
int res = setvbuf(f, NULL, mode[op], sz);
462
return pushresult(L, res == 0, NULL);
463
}
464
465
466
467
static int io_flush (lua_State *L) {
468
return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
469
}
470
471
472
static int f_flush (lua_State *L) {
473
return pushresult(L, fflush(tofile(L)) == 0, NULL);
474
}
475
476
477
static const luaL_Reg iolib[] = {
478
{"close", io_close},
479
{"flush", io_flush},
480
{"input", io_input},
481
{"lines", io_lines},
482
{"open", io_open},
483
{"output", io_output},
484
{"popen", io_popen},
485
{"read", io_read},
486
{"tmpfile", io_tmpfile},
487
{"type", io_type},
488
{"write", io_write},
489
{NULL, NULL}
490
};
491
492
493
static const luaL_Reg flib[] = {
494
{"close", io_close},
495
{"flush", f_flush},
496
{"lines", f_lines},
497
{"read", f_read},
498
{"seek", f_seek},
499
{"setvbuf", f_setvbuf},
500
{"write", f_write},
501
{"__gc", io_gc},
502
{"__tostring", io_tostring},
503
{NULL, NULL}
504
};
505
506
507
static void createmeta (lua_State *L) {
508
luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
509
lua_pushvalue(L, -1); /* push metatable */
510
lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
511
luaL_register(L, NULL, flib); /* file methods */
512
}
513
514
515
static void createstdfile (lua_State *L, FILE *f, int k, const char *fname) {
516
*newfile(L) = f;
517
if (k > 0) {
518
lua_pushvalue(L, -1);
519
lua_rawseti(L, LUA_ENVIRONINDEX, k);
520
}
521
lua_pushvalue(L, -2); /* copy environment */
522
lua_setfenv(L, -2); /* set it */
523
lua_setfield(L, -3, fname);
524
}
525
526
527
static void newfenv (lua_State *L, lua_CFunction cls) {
528
lua_createtable(L, 0, 1);
529
lua_pushcfunction(L, cls);
530
lua_setfield(L, -2, "__close");
531
}
532
533
534
LUALIB_API int luaopen_io (lua_State *L) {
535
createmeta(L);
536
/* create (private) environment (with fields IO_INPUT, IO_OUTPUT, __close) */
537
newfenv(L, io_fclose);
538
lua_replace(L, LUA_ENVIRONINDEX);
539
/* open library */
540
luaL_register(L, LUA_IOLIBNAME, iolib);
541
/* create (and set) default files */
542
newfenv(L, io_noclose); /* close function for default files */
543
createstdfile(L, stdin, IO_INPUT, "stdin");
544
createstdfile(L, stdout, IO_OUTPUT, "stdout");
545
createstdfile(L, stderr, 0, "stderr");
546
lua_pop(L, 1); /* pop environment for default files */
547
lua_getfield(L, -1, "popen");
548
newfenv(L, io_pclose); /* create environment for 'popen' */
549
lua_setfenv(L, -2); /* set fenv for 'popen' */
550
lua_pop(L, 1); /* pop 'popen' */
551
return 1;
552
}
553
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