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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618
|
/********************************************
fin.c
copyright 2008-2018,2020. Thomas E. Dickey
copyright 1991-1995,1996. 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 2, 1991.
********************************************/
/*
* $MawkId: fin.c,v 1.47 2020/01/20 01:56:30 tom Exp $
*/
/* fin.c */
#include "mawk.h"
#include "fin.h"
#include "memory.h"
#include "bi_vars.h"
#include "field.h"
#include "symtype.h"
#include "scan.h"
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
/* This file handles input files. Opening, closing,
buffering and (most important) splitting files into
records, FINgets().
*/
static FIN *next_main(int);
static char *enlarge_fin_buffer(FIN *);
int is_cmdline_assign(char *); /* also used by init */
/* 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,
1, EOF_FLAG};
static void
free_fin_data(FIN * fin)
{
if (fin != &dead_main) {
zfree(fin->buff, (size_t) (fin->nbuffs * BUFFSZ + 1));
ZFREE(fin);
}
}
/* convert file-descriptor to FIN*.
It's the main stream if main_flag is set
*/
FIN *
FINdopen(int fd, int main_flag)
{
FIN *fin = ZMALLOC(FIN);
fin->fd = fd;
fin->flags = main_flag ? (MAIN_FLAG | START_FLAG) : START_FLAG;
fin->buffp = fin->buff = (char *) zmalloc((size_t) BUFFSZ + 1);
fin->limit = fin->buffp;
fin->nbuffs = 1;
fin->buff[0] = 0;
if ((isatty(fd) && rs_shadow.type == SEP_CHAR && rs_shadow.c == '\n')
|| interactive_flag) {
/* interactive, i.e., line buffer this file */
if (fd == 0) {
fin->fp = stdin;
} else if (!(fin->fp = fdopen(fd, "r"))) {
errmsg(errno, "fdopen failed");
free_fin_data(fin);
mawk_exit(2);
}
} 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.
*/
FIN *
FINopen(char *filename, int main_flag)
{
FIN *result = 0;
int fd;
int oflag = O_RDONLY;
#if USE_BINMODE
int bm = binmode() & 1;
if (bm)
oflag |= O_BINARY;
#endif
TRACE(("FINopen(%s)\n", filename));
if ((filename[0] == '-' && filename[1] == 0) ||
(filename[0] == '/' && !strcmp(filename, "/dev/stdin"))) {
#if USE_BINMODE
if (bm)
setmode(0, O_BINARY);
#endif
result = FINdopen(0, main_flag);
} else if ((fd = open(filename, oflag, 0)) != -1) {
result = FINdopen(fd, main_flag);
}
return result;
}
/* frees the buffer and fd, but leaves FIN structure until
the user calls close() */
void
FINsemi_close(FIN * fin)
{
static char dead = 0;
if (fin->buff != &dead) {
zfree(fin->buff, (size_t) (fin->nbuffs * BUFFSZ + 1));
if (fin->fd) {
if (fin->fp)
fclose(fin->fp);
else
close(fin->fd);
}
fin->flags |= EOF_FLAG;
fin->limit =
fin->buff =
fin->buffp = &dead; /* marks it semi_closed */
}
/* else was already semi_closed */
}
/* user called close() on input file */
void
FINclose(FIN * fin)
{
FINsemi_close(fin);
ZFREE(fin);
}
/* return one input record as determined by RS,
from input file (FIN) fin
*/
char *
FINgets(FIN * fin, size_t *len_p)
{
char *p;
char *q = 0;
size_t match_len;
size_t r;
restart:
if ((p = fin->buffp) >= fin->limit) { /* need a refill */
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->fp) {
int have_nl = 0;
int got_any = 0;
char *my_buff = fin->buff;
do {
/* line buffering */
if (!fgets(my_buff, BUFFSZ + 1, fin->fp)) {
if (got_any) {
/* no newline, but we have data -- okay */
break;
}
fin->flags |= EOF_FLAG;
fin->buff[0] = 0;
fin->buffp = fin->buff;
fin->limit = fin->buffp;
goto restart; /* might be main_fin */
} else { /* return this line */
/*
* Using fgets, we cannot detect embedded nulls in the
* input. Assume that a null is the one added by fgets
* after reading data. If we have a newline, that is
* better, since fgets has the complete line.
*/
p = my_buff;
while (*p != '\n' && *p != 0)
p++;
if (*p == '\n') {
have_nl = 1;
*p = 0;
} else {
/*
* Increase the buffer size to allow reading more data,
* and point 'my_buff' to the beginning of the extra
* space. Doing it this way assumes very-long lines
* are rare.
*/
size_t old_size = (size_t) (fin->nbuffs++ * BUFFSZ + 1);
size_t new_size = old_size + BUFFSZ;
char *new_buff = (char *) zmalloc(new_size);
size_t my_size = (size_t) (p - fin->buff);
if (new_buff != fin->buff) {
memcpy(new_buff, fin->buff, my_size);
zfree(fin->buff, old_size);
fin->buff = new_buff;
}
my_buff = my_size + fin->buff;
p = my_buff;
got_any = 1;
}
}
} while (!have_nl);
/*
* At this point, 'p' points to the terminating null for the
* input line. Fill in the FIN structure details.
*/
*len_p = (size_t) (p - fin->buff);
fin->buffp = p;
fin->limit = fin->buffp + strlen(fin->buffp);
return fin->buff;
} else {
/* block buffering */
r = fillbuff(fin->fd, fin->buff, (size_t) (fin->nbuffs * BUFFSZ));
if (r == 0) {
fin->flags |= EOF_FLAG;
fin->buffp = fin->buff;
fin->limit = fin->buffp;
goto restart; /* might be main */
} else if (r < fin->nbuffs * BUFFSZ) {
fin->flags |= EOF_FLAG;
}
fin->limit = fin->buff + r;
p = fin->buffp = fin->buff;
if (fin->flags & START_FLAG) {
fin->flags &= ~START_FLAG;
if (rs_shadow.type == SEP_MLR) {
/* trim blank lines from front of file */
while (*p == '\n')
p++;
fin->buffp = p;
if (p >= fin->limit)
goto restart;
}
}
}
}
retry:
switch (rs_shadow.type) {
case SEP_CHAR:
q = memchr(p, rs_shadow.c, (size_t) (fin->limit - p));
match_len = 1;
break;
case SEP_STR:
q = str_str(p,
(size_t) (fin->limit - p),
((STRING *) rs_shadow.ptr)->str,
match_len = ((STRING *) rs_shadow.ptr)->len);
break;
case SEP_MLR:
case SEP_RE:
q = re_pos_match(p, (size_t) (fin->limit - p), rs_shadow.ptr,
&match_len,
(p != fin->buff) ||
(fin->flags & FIN_FLAG));
/* if the match is at the end, there might still be
more to match in the file */
if (q && q[match_len] == 0 && !(fin->flags & EOF_FLAG)) {
TRACE(("re_pos_match cancelled\n"));
q = (char *) 0;
}
break;
default:
bozo("type of rs_shadow");
}
if (q) {
/* the easy and normal case */
*q = 0;
*len_p = (unsigned) (q - p);
fin->buffp = q + match_len;
return p;
}
if (fin->flags & EOF_FLAG) {
/* last line without a record terminator */
*len_p = r = (unsigned) (fin->limit - p);
fin->buffp = p + r;
if (rs_shadow.type == SEP_MLR && fin->buffp[-1] == '\n'
&& r != 0) {
(*len_p)--;
*--fin->buffp = 0;
fin->limit--;
}
return p;
}
if (p == fin->buff) {
/* current record is too big for the input buffer, grow buffer */
p = enlarge_fin_buffer(fin);
} else {
/* move a partial line to front of buffer and try again */
size_t rr;
size_t amount = (size_t) (fin->limit - p);
size_t blocks = fin->nbuffs * BUFFSZ;
fin->flags |= FIN_FLAG;
r = amount;
if (blocks < r) {
fin->flags |= EOF_FLAG;
return 0;
}
p = (char *) memmove(fin->buff, p, r);
q = p + r;
rr = blocks - r;
if ((r = fillbuff(fin->fd, q, rr)) < rr) {
fin->flags |= EOF_FLAG;
fin->limit = fin->buff + amount + r;
}
}
goto retry;
}
static char *
enlarge_fin_buffer(FIN * fin)
{
size_t r;
size_t oldsize = fin->nbuffs * BUFFSZ + 1;
size_t limit = (size_t) (fin->limit - fin->buff);
#ifdef MSDOS
/* I'm not sure this can really happen:
avoid "16bit wrap" */
if (fin->nbuffs == MAX_BUFFS) {
errmsg(0, "out of input buffer space");
mawk_exit(2);
}
#endif
fin->buffp =
fin->buff = (char *) zrealloc(fin->buff, oldsize, oldsize + BUFFSZ);
fin->nbuffs++;
r = fillbuff(fin->fd, fin->buff + (oldsize - 1), (size_t) BUFFSZ);
if (r < BUFFSZ)
fin->flags |= EOF_FLAG;
fin->limit = fin->buff + limit + r;
return fin->buff;
}
/*--------
target is big enough to hold size + 1 chars
on exit the back of the target is zero terminated
*--------------*/
size_t
fillbuff(int fd, char *target, size_t size)
{
register int r;
size_t entry_size = size;
while (size)
switch (r = (int) read(fd, target, size)) {
case -1:
errmsg(errno, "read error");
mawk_exit(2);
case 0:
goto out;
default:
target += r;
size -= (unsigned) r;
break;
}
out:
*target = 0;
return (size_t) (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 = (PTR) 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 USE_BINMODE
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 */
static FIN *
next_main(int open_flag) /* called by open_main() if on */
{
register CELL *cp;
CELL argc; /* copy of ARGC */
CELL c_argi; /* cell copy of argi */
CELL argval; /* copy of ARGV[c_argi] */
int failed = 1;
argval.type = C_NOINIT;
c_argi.type = C_DOUBLE;
if (main_fin) {
FINclose(main_fin);
main_fin = 0;
}
/* 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) {
/* file argument is "" */
cell_destroy(cp);
continue;
}
/* 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);
cell_destroy(cp);
cell_destroy(FNR);
FNR->type = C_DOUBLE;
FNR->dval = 0.0;
rt_fnr = 0;
failed = 0;
break;
}
if (failed) {
cell_destroy(&argval);
if (open_flag) {
/* all arguments were null or assignment */
set_main_to_stdin();
} else {
main_fin = &dead_main;
/* since MAIN_FLAG is not set, FINgets won't call next_main() */
}
}
return main_fin;
}
int
is_cmdline_assign(char *s)
{
register char *p;
int c;
SYMTAB *stp;
CELL *cp = 0;
size_t len;
CELL cell; /* used if command line assign to pseudo field */
CELL *fp = (CELL *) 0; /* ditto */
size_t length;
if (scan_code[*(unsigned char *) s] != SC_IDCHAR)
return 0;
p = s + 1;
while ((c = scan_code[*(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;
/* posix says escape sequences are on from command line */
p = rm_escape(strcpy((char *) zmalloc(len), p), &length);
cp->ptr = (PTR) new_STRING1(p, length);
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;
}
#ifdef NO_LEAKS
void
fin_leaks(void)
{
TRACE(("fin_leaks\n"));
if (main_fin) {
free_fin_data(main_fin);
main_fin = 0;
}
}
#endif
|