-
Notifications
You must be signed in to change notification settings - Fork 0
/
fin.c
564 lines (473 loc) · 14.3 KB
/
fin.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
/********************************************
fin.c
copyright 1991,1992,2014-2016 Michael D. Brennan
This is a source file for mawk, an implementation of
the AWK programming language.
Mawk is distributed without warranty under the terms of
the GNU General Public License, version 3, 2007.
If you import elements of this code into another product,
you agree to not name that product mawk.
********************************************/
/* fin.c */
#include "mawk.h"
#include "fin.h"
#include "types_string.h"
#include "bi_vars.h"
#include "field.h"
#include "table.h"
#include "scan.h"
#include <fcntl.h>
/* This file handles input files. Opening, closing,
buffering and (most important) splitting files into
records, FINgets().
*/
static char * enlarge_fin_buffer( FIN * );
static void set_main_to_stdin( void );
int is_cmdline_assign( char * ); /* also used by init */
/* convert file-descriptor to FIN*.
It's the main stream if main_flag is set
*/
FIN *
FINdopen( int fd, int main_flag )
{
register FIN * fin = ZMALLOC( FIN );
fin->fd = fd;
fin->flags = main_flag ? ( MAIN_FLAG | START_FLAG ) : START_FLAG;
fin->end = fin->start = fin->buff = (char *)emalloc( FINBUFFSZ );
fin->buffsz = FINBUFFSZ;
if ( ( isatty( fd ) && rs_shadow.type == SEP_CHAR && rs_shadow.c == '\n' )
|| ( interactive_flag && fd == 0 ) ) {
/* interactive, i.e., line buffer this file */
if ( fd == 0 )
fin->fp = stdin;
else if ( !( fin->fp = fdopen( fd, "r" ) ) ) {
errmsg( errno, "fdopen failed" );
mawk_exit( 2 );
}
fin->fd = -1; /* marks it interactive */
}
else
fin->fp = (FILE *)0;
return fin;
}
/* open a FIN* by filename.
It's the main stream if main_flag is set.
Recognizes "-" as stdin.
Recognizes "/dev/stdin" as stdin.
*/
FIN *
FINopen( const char * filename, int main_flag )
{
int fd;
int oflag = O_RDONLY;
#if MSDOS
int bm = binmode() & 1;
if ( bm )
oflag |= O_BINARY;
#endif
if ( ( filename[0] == '-' && filename[1] == 0 ) || strcmp( filename, "/dev/stdin" ) == 0 ) {
#if MSDOS
if ( bm )
setmode( 0, O_BINARY );
#endif
return FINdopen( 0, main_flag );
}
if ( ( fd = open( filename, oflag, 0 ) ) == -1 )
return (FIN *)0;
else
return FINdopen( fd, main_flag );
}
FIN *
FINpopen( const char * command )
{
FIN * ret = 0;
FILE * fp = popen( command, "r" );
if ( fp ) {
ret = FINdopen( fileno( fp ), 0 );
ret->fp = fp;
}
return ret;
}
/* frees the buffer and fd, but leaves FIN structure until
the user calls close()
This only gets called from getline and FINclose
we don't really close stdin/0 so association to "-" always works
*/
void
FINsemi_close( FIN * fin )
{
static char dead = 0;
if ( fin->buff != &dead ) {
free( fin->buff );
fin->buff = &dead;
/* belt and suspenders */
fin->start = fin->end = fin->buff;
fin->flags = EOF_FLAG;
fin->close_val = 0;
if ( fin->fd == -1 ) {
if ( fin->fp != stdin ) {
fin->close_val = fclose( fin->fp );
}
}
else if ( fin->fp ) {
fin->close_val = pclose( fin->fp );
}
else if ( fin->fd != 0 ) {
fin->close_val = close( fin->fd );
}
}
/* else was already semi_closed */
}
/* user called close() on input file */
int
FINclose( FIN * fin )
{
int ret;
FINsemi_close( fin );
ret = fin->close_val;
ZFREE( fin );
return ret;
}
/* return one input record as determined by RS,
from input file (FIN) fin
*/
char *
FINgets( FIN * fin, size_t * len_p )
{
char * rec_start;
char * rec_end = 0;
size_t match_len;
restart:
rec_start = fin->start;
if ( fin->start >= fin->end ) {
if ( fin->flags & EOF_FLAG ) {
if ( fin->flags & MAIN_FLAG ) {
fin = next_main( 0 );
goto restart;
}
else {
*len_p = 0;
return (char *)0;
}
}
if ( fin->fd == -1 ) {
/* line buffering */
if ( !fgets( fin->buff, BUFFSZ - 1, fin->fp ) ) {
fin->flags |= EOF_FLAG;
fin->buff[0] = 0;
fin->end = fin->start = fin->buff;
goto restart; /* might be main_fin */
}
else /* return this line */
{
/* TBD fix -- doesn't handle lines bigger than BUFFSZ-1 */
/* low priority */
/* find eol */
char * p = fin->buff;
while ( *p != '\n' && *p != 0 )
p++;
*p = 0;
*len_p = p - fin->buff;
fin->end = fin->start = p;
return fin->buff;
}
}
else {
/* block buffering */
size_t r = fillbuff( fin->fd, fin->buff, fin->buffsz );
if ( r == 0 ) {
fin->flags |= EOF_FLAG;
fin->end = fin->start = fin->buff;
goto restart; /* might be main */
}
else if ( r < fin->buffsz ) {
fin->flags |= EOF_FLAG;
}
rec_start = fin->start = fin->buff;
fin->end = fin->start + r;
if ( fin->flags & START_FLAG ) {
fin->flags &= ~START_FLAG;
if ( rs_shadow.type == SEP_MLR ) {
/* trim blank lines from front of file */
while ( rec_start < fin->end && *rec_start == '\n' )
rec_start++;
fin->start = rec_start;
if ( rec_start >= fin->end ) {
goto restart;
}
}
}
}
}
retry:
switch ( rs_shadow.type ) {
case SEP_CHAR:
rec_end = (char *)memchr( rec_start, rs_shadow.c, fin->end - rec_start );
match_len = 1;
break;
case SEP_STR: {
STRING * str = (STRING *)rs_shadow.ptr;
rec_end = str_str( rec_start, fin->end - rec_start, str->str, str->len );
match_len = str->len;
break;
}
case SEP_MLR:
case SEP_RE:
rec_end = re_pos_match( rec_start, fin->end - rec_start, rs_shadow.ptr, &match_len, 0 );
/* if the match is at the end, there might still be
more to match in the file */
if ( rec_end && rec_end + match_len == fin->end && !( fin->flags & EOF_FLAG ) ) {
rec_end = (char *)0;
}
break;
default:
bozo( "type of rs_shadow" );
}
if ( rec_end ) {
/* the easy and normal case */
*len_p = rec_end - rec_start;
fin->start = rec_end + match_len;
return rec_start;
}
if ( fin->flags & EOF_FLAG ) {
/* last record without a record terminator */
*len_p = fin->end - rec_start;
fin->start = fin->end;
if ( rs_shadow.type == SEP_MLR && fin->end[-1] == '\n' ) {
/* multi line terminator
last record was terminated with only one '\n'
make the single '\n' the last record terminator
*/
*len_p -= 1;
}
return rec_start;
}
if ( rec_start == fin->buff ) {
/* current record is too big for the input buffer, grow buffer */
rec_start = enlarge_fin_buffer( fin );
}
else {
/* move a partial line to front of buffer and try again
the partial line starts at rec_start and ends at fin->end */
size_t partial_sz = fin->end - rec_start;
size_t fillsz = fin->buffsz - partial_sz;
size_t actual_fillsz;
/* the man pages say memcpy might not work here, probably BS but ...*/
memmove( fin->buff, rec_start, partial_sz );
rec_start = fin->buff;
actual_fillsz = fillbuff( fin->fd, fin->buff + partial_sz, fillsz );
fin->end = fin->buff + partial_sz + actual_fillsz;
if ( actual_fillsz < fillsz ) {
fin->flags |= EOF_FLAG;
}
}
goto retry;
}
#define K256 ( 1024 * 256 )
/* double buffer size up to 256K, then grow by 256K */
static char *
enlarge_fin_buffer( FIN * fin )
{
size_t r;
size_t oldsize = fin->buffsz;
size_t newsize = oldsize < K256 ? 2 * oldsize : oldsize + K256;
size_t delta = newsize - oldsize;
fin->start = fin->buff = (char *)erealloc( fin->buff, newsize );
fin->buffsz = newsize;
r = fillbuff( fin->fd, fin->buff + oldsize, delta );
if ( r < delta )
fin->flags |= EOF_FLAG;
fin->end = fin->buff + oldsize + r;
return fin->buff;
}
/*--------
target is big enough to hold size chars
terminates if read error
Note a return of less than size indicates EOF
*--------------*/
size_t
fillbuff( int fd, char * target, size_t size )
{
int r;
size_t entry_size = size;
while ( size > 0 ) {
switch ( r = read( fd, target, size ) ) {
case -1:
errmsg( errno, "read error" );
mawk_exit( 2 );
case 0:
goto out;
default:
target += r;
size -= r;
break;
}
}
out:
return entry_size - size;
}
/* main_fin is a handle to the main input stream
== 0 never been opened */
FIN * main_fin;
ARRAY Argv; /* to the user this is ARGV */
static double argi = 1.0; /* index of next ARGV[argi] to try to open */
static void
set_main_to_stdin( void )
{
cell_destroy( FILENAME );
FILENAME->type = C_STRING;
FILENAME->ptr = (void *)new_STRING( "-" );
cell_destroy( FNR );
FNR->type = C_DOUBLE;
FNR->dval = 0.0;
rt_fnr = 0;
main_fin = FINdopen( 0, 1 );
}
/* this gets called once to get the input stream going.
It is called after the execution of the BEGIN block
unless there is a getline inside BEGIN {}
*/
void
open_main( void )
{
CELL argc;
#if MSDOS
int k = binmode();
if ( k & 1 )
setmode( 0, O_BINARY );
if ( k & 2 ) {
setmode( 1, O_BINARY );
setmode( 2, O_BINARY );
}
#endif
cellcpy( &argc, ARGC );
if ( argc.type != C_DOUBLE )
cast1_to_d( &argc );
if ( argc.dval == 1.0 )
set_main_to_stdin();
else
next_main( 1 );
}
/* get the next command line file open */
FIN *
next_main( int open_flag )
/* called by open_main() if open_flag is on */
{
register CELL * cp;
CELL argc; /* copy of ARGC */
CELL c_argi; /* cell copy of argi */
CELL argval; /* copy of ARGV[c_argi] */
argval.type = C_NOINIT;
c_argi.type = C_DOUBLE;
if ( main_fin )
FINclose( main_fin );
/* FILENAME and FNR don't change unless we really open
a new file */
/* make a copy of ARGC to avoid side effect */
if ( cellcpy( &argc, ARGC )->type != C_DOUBLE )
cast1_to_d( &argc );
while ( argi < argc.dval ) {
c_argi.dval = argi;
argi += 1.0;
if ( !( cp = array_find( Argv, &c_argi, NO_CREATE ) ) )
continue; /* its deleted */
/* make a copy so we can cast w/o side effect */
cell_destroy( &argval );
cp = cellcpy( &argval, cp );
if ( cp->type < C_STRING )
cast1_to_s( cp );
if ( string( cp )->len == 0 )
continue;
/* file argument is "" */
/* it might be a command line assignment */
if ( is_cmdline_assign( string( cp )->str ) )
continue;
/* try to open it -- we used to continue on failure,
but posix says we should quit */
if ( !( main_fin = FINopen( string( cp )->str, 1 ) ) ) {
errmsg( errno, "cannot open %s", string( cp )->str );
mawk_exit( 2 );
}
/* success -- set FILENAME and FNR */
cell_destroy( FILENAME );
cellcpy( FILENAME, cp );
free_STRING( string( cp ) );
cell_destroy( FNR );
FNR->type = C_DOUBLE;
FNR->dval = 0.0;
rt_fnr = 0;
return main_fin;
}
/* failure */
cell_destroy( &argval );
if ( open_flag ) {
/* all arguments were null or assignment */
set_main_to_stdin();
return main_fin;
}
/* real failure */
{
/* this is how we mark EOF on main_fin */
static char dead_buff = 0;
static FIN dead_main = { 0, (FILE *)0, &dead_buff, &dead_buff, &dead_buff, 0, EOF_FLAG };
return main_fin = &dead_main;
/* since MAIN_FLAG is not set, FINgets won't call next_main() */
}
}
int
is_cmdline_assign( char * s )
{
char * p;
int c;
SYMTAB * stp;
CELL * cp = 0;
unsigned len;
CELL cell; /* used if command line assign to pseudo field */
CELL * fp = (CELL *)0; /* ditto */
if ( scan_code_get(*(unsigned char *)s) != SC_IDCHAR )
return 0;
p = s + 1;
while ( ( c = scan_code_get(*(unsigned char *)p) ) == SC_IDCHAR
|| c == SC_DIGIT )
p++;
if ( *p != '=' )
return 0;
*p = 0;
stp = find( s );
switch ( stp->type ) {
case ST_NONE:
stp->type = ST_VAR;
stp->stval.cp = cp = ZMALLOC( CELL );
break;
case ST_VAR:
case ST_NR: /* !! no one will do this */
cp = stp->stval.cp;
cell_destroy( cp );
break;
case ST_FIELD:
/* must be pseudo field */
fp = stp->stval.cp;
cp = &cell;
break;
default:
rt_error(
"cannot command line assign to %s\n\ttype clash or keyword", s );
}
/* we need to keep ARGV[i] intact */
*p++ = '=';
len = strlen( p ) + 1;
p = strcpy( (char *)zmalloc( len ), p );
{
/* posix says escape sequences are on from command line */
size_t rlen = rm_escape( p );
cp->ptr = new_STRING2( p, rlen );
}
zfree( p, len );
check_strnum( cp ); /* sets cp->type */
if ( fp ) /* move it from cell to pfield[] */
{
field_assign( fp, cp );
free_STRING( string( cp ) );
}
return 1;
}