1 /* 2 * Copyright (c) Ian F. Darwin 1986-1995. 3 * Software written by Ian F. Darwin and others; 4 * maintained 1995-present by Christos Zoulas and others. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice immediately at the beginning of the file, without modification, 11 * this list of conditions, and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 /* 29 * compress routines: 30 * zmagic() - returns 0 if not recognized, uncompresses and prints 31 * information if recognized 32 * uncompress(method, old, n, newch) - uncompress old into new, 33 * using method, return sizeof new 34 */ 35 #include "file.h" 36 37 #ifndef lint 38 FILE_RCSID("@(#)$File: compress.c,v 1.105 2017/05/25 00:13:03 christos Exp $") 39 #endif 40 41 #include "magic.h" 42 #include <stdlib.h> 43 #ifdef HAVE_UNISTD_H 44 #include <unistd.h> 45 #endif 46 #include <string.h> 47 #include <errno.h> 48 #include <ctype.h> 49 #include <stdarg.h> 50 #ifdef HAVE_SIGNAL_H 51 #include <signal.h> 52 # ifndef HAVE_SIG_T 53 typedef void (*sig_t)(int); 54 # endif /* HAVE_SIG_T */ 55 #endif 56 #if !defined(__MINGW32__) && !defined(WIN32) 57 #include <sys/ioctl.h> 58 #endif 59 #ifdef HAVE_SYS_WAIT_H 60 #include <sys/wait.h> 61 #endif 62 #if defined(HAVE_SYS_TIME_H) 63 #include <sys/time.h> 64 #endif 65 #if defined(HAVE_ZLIB_H) && defined(ZLIBSUPPORT) 66 #define BUILTIN_DECOMPRESS 67 #include <zlib.h> 68 #endif 69 #ifdef DEBUG 70 int tty = -1; 71 #define DPRINTF(...) do { \ 72 if (tty == -1) \ 73 tty = open("/dev/tty", O_RDWR); \ 74 if (tty == -1) \ 75 abort(); \ 76 dprintf(tty, __VA_ARGS__); \ 77 } while (/*CONSTCOND*/0) 78 #else 79 #define DPRINTF(...) 80 #endif 81 82 #ifdef ZLIBSUPPORT 83 /* 84 * The following python code is not really used because ZLIBSUPPORT is only 85 * defined if we have a built-in zlib, and the built-in zlib handles that. 86 * That is not true for android where we have zlib.h and not -lz. 87 */ 88 static const char zlibcode[] = 89 "import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))"; 90 91 static const char *zlib_args[] = { "python", "-c", zlibcode, NULL }; 92 93 static int 94 zlibcmp(const unsigned char *buf) 95 { 96 unsigned short x = 1; 97 unsigned char *s = CAST(unsigned char *, CAST(void *, &x)); 98 99 if ((buf[0] & 0xf) != 8 || (buf[0] & 0x80) != 0) 100 return 0; 101 if (s[0] != 1) /* endianness test */ 102 x = buf[0] | (buf[1] << 8); 103 else 104 x = buf[1] | (buf[0] << 8); 105 if (x % 31) 106 return 0; 107 return 1; 108 } 109 #endif 110 111 #define gzip_flags "-cd" 112 #define lrzip_flags "-do" 113 #define lzip_flags gzip_flags 114 115 static const char *gzip_args[] = { 116 "gzip", gzip_flags, NULL 117 }; 118 static const char *uncompress_args[] = { 119 "uncompress", "-c", NULL 120 }; 121 static const char *bzip2_args[] = { 122 "bzip2", "-cd", NULL 123 }; 124 static const char *lzip_args[] = { 125 "lzip", lzip_flags, NULL 126 }; 127 static const char *xz_args[] = { 128 "xz", "-cd", NULL 129 }; 130 static const char *lrzip_args[] = { 131 "lrzip", lrzip_flags, NULL 132 }; 133 static const char *lz4_args[] = { 134 "lz4", "-cd", NULL 135 }; 136 static const char *zstd_args[] = { 137 "zstd", "-cd", NULL 138 }; 139 140 private const struct { 141 const void *magic; 142 size_t maglen; 143 const char **argv; 144 } compr[] = { 145 { "\037\235", 2, gzip_args }, /* compressed */ 146 /* Uncompress can get stuck; so use gzip first if we have it 147 * Idea from Damien Clark, thanks! */ 148 { "\037\235", 2, uncompress_args }, /* compressed */ 149 { "\037\213", 2, gzip_args }, /* gzipped */ 150 { "\037\236", 2, gzip_args }, /* frozen */ 151 { "\037\240", 2, gzip_args }, /* SCO LZH */ 152 /* the standard pack utilities do not accept standard input */ 153 { "\037\036", 2, gzip_args }, /* packed */ 154 { "PK\3\4", 4, gzip_args }, /* pkzipped, */ 155 /* ...only first file examined */ 156 { "BZh", 3, bzip2_args }, /* bzip2-ed */ 157 { "LZIP", 4, lzip_args }, /* lzip-ed */ 158 { "\3757zXZ\0", 6, xz_args }, /* XZ Utils */ 159 { "LRZI", 4, lrzip_args }, /* LRZIP */ 160 { "\004\"M\030",4, lz4_args }, /* LZ4 */ 161 { "\x28\xB5\x2F\xFD", 4, zstd_args }, /* zstd */ 162 #ifdef ZLIBSUPPORT 163 { RCAST(const void *, zlibcmp), 0, zlib_args }, /* zlib */ 164 #endif 165 }; 166 167 #define OKDATA 0 168 #define NODATA 1 169 #define ERRDATA 2 170 171 private ssize_t swrite(int, const void *, size_t); 172 #if HAVE_FORK 173 private size_t ncompr = sizeof(compr) / sizeof(compr[0]); 174 private int uncompressbuf(int, size_t, size_t, const unsigned char *, 175 unsigned char **, size_t *); 176 #ifdef BUILTIN_DECOMPRESS 177 private int uncompresszlib(const unsigned char *, unsigned char **, size_t, 178 size_t *, int); 179 private int uncompressgzipped(const unsigned char *, unsigned char **, size_t, 180 size_t *); 181 #endif 182 static int makeerror(unsigned char **, size_t *, const char *, ...) 183 __attribute__((__format__(__printf__, 3, 4))); 184 private const char *methodname(size_t); 185 186 protected int 187 file_zmagic(struct magic_set *ms, int fd, const char *name, 188 const unsigned char *buf, size_t nbytes) 189 { 190 unsigned char *newbuf = NULL; 191 size_t i, nsz; 192 char *rbuf; 193 file_pushbuf_t *pb; 194 int urv, prv, rv = 0; 195 int mime = ms->flags & MAGIC_MIME; 196 #ifdef HAVE_SIGNAL_H 197 sig_t osigpipe; 198 #endif 199 200 if ((ms->flags & MAGIC_COMPRESS) == 0) 201 return 0; 202 203 #ifdef HAVE_SIGNAL_H 204 osigpipe = signal(SIGPIPE, SIG_IGN); 205 #endif 206 for (i = 0; i < ncompr; i++) { 207 int zm; 208 if (nbytes < compr[i].maglen) 209 continue; 210 #ifdef ZLIBSUPPORT 211 if (compr[i].maglen == 0) 212 zm = (RCAST(int (*)(const unsigned char *), 213 CCAST(void *, compr[i].magic)))(buf); 214 else 215 #endif 216 zm = memcmp(buf, compr[i].magic, compr[i].maglen) == 0; 217 218 if (!zm) 219 continue; 220 nsz = nbytes; 221 urv = uncompressbuf(fd, ms->bytes_max, i, buf, &newbuf, &nsz); 222 DPRINTF("uncompressbuf = %d, %s, %zu\n", urv, (char *)newbuf, 223 nsz); 224 switch (urv) { 225 case OKDATA: 226 case ERRDATA: 227 228 ms->flags &= ~MAGIC_COMPRESS; 229 if (urv == ERRDATA) 230 prv = file_printf(ms, "%s ERROR: %s", 231 methodname(i), newbuf); 232 else 233 prv = file_buffer(ms, -1, name, newbuf, nsz); 234 if (prv == -1) 235 goto error; 236 rv = 1; 237 if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0) 238 goto out; 239 if (mime != MAGIC_MIME && mime != 0) 240 goto out; 241 if ((file_printf(ms, 242 mime ? " compressed-encoding=" : " (")) == -1) 243 goto error; 244 if ((pb = file_push_buffer(ms)) == NULL) 245 goto error; 246 /* 247 * XXX: If file_buffer fails here, we overwrite 248 * the compressed text. FIXME. 249 */ 250 if (file_buffer(ms, -1, NULL, buf, nbytes) == -1) 251 goto error; 252 if ((rbuf = file_pop_buffer(ms, pb)) != NULL) { 253 if (file_printf(ms, "%s", rbuf) == -1) { 254 free(rbuf); 255 goto error; 256 } 257 free(rbuf); 258 } 259 if (!mime && file_printf(ms, ")") == -1) 260 goto error; 261 /*FALLTHROUGH*/ 262 case NODATA: 263 break; 264 default: 265 abort(); 266 /*NOTREACHED*/ 267 error: 268 rv = -1; 269 break; 270 } 271 } 272 out: 273 DPRINTF("rv = %d\n", rv); 274 275 #ifdef HAVE_SIGNAL_H 276 (void)signal(SIGPIPE, osigpipe); 277 #endif 278 free(newbuf); 279 ms->flags |= MAGIC_COMPRESS; 280 DPRINTF("Zmagic returns %d\n", rv); 281 return rv; 282 } 283 #endif 284 /* 285 * `safe' write for sockets and pipes. 286 */ 287 private ssize_t 288 swrite(int fd, const void *buf, size_t n) 289 { 290 ssize_t rv; 291 size_t rn = n; 292 293 do 294 switch (rv = write(fd, buf, n)) { 295 case -1: 296 if (errno == EINTR) 297 continue; 298 return -1; 299 default: 300 n -= rv; 301 buf = CAST(const char *, buf) + rv; 302 break; 303 } 304 while (n > 0); 305 return rn; 306 } 307 308 309 /* 310 * `safe' read for sockets and pipes. 311 */ 312 protected ssize_t 313 sread(int fd, void *buf, size_t n, int canbepipe __attribute__((__unused__))) 314 { 315 ssize_t rv; 316 #ifdef FIONREAD 317 int t = 0; 318 #endif 319 size_t rn = n; 320 321 if (fd == STDIN_FILENO) 322 goto nocheck; 323 324 #ifdef FIONREAD 325 if (canbepipe && (ioctl(fd, FIONREAD, &t) == -1 || t == 0)) { 326 #ifdef FD_ZERO 327 ssize_t cnt; 328 for (cnt = 0;; cnt++) { 329 fd_set check; 330 struct timeval tout = {0, 100 * 1000}; 331 int selrv; 332 333 FD_ZERO(&check); 334 FD_SET(fd, &check); 335 336 /* 337 * Avoid soft deadlock: do not read if there 338 * is nothing to read from sockets and pipes. 339 */ 340 selrv = select(fd + 1, &check, NULL, NULL, &tout); 341 if (selrv == -1) { 342 if (errno == EINTR || errno == EAGAIN) 343 continue; 344 } else if (selrv == 0 && cnt >= 5) { 345 return 0; 346 } else 347 break; 348 } 349 #endif 350 (void)ioctl(fd, FIONREAD, &t); 351 } 352 353 if (t > 0 && (size_t)t < n) { 354 n = t; 355 rn = n; 356 } 357 #endif 358 359 nocheck: 360 do 361 switch ((rv = read(fd, buf, n))) { 362 case -1: 363 if (errno == EINTR) 364 continue; 365 return -1; 366 case 0: 367 return rn - n; 368 default: 369 n -= rv; 370 buf = CAST(char *, CCAST(void *, buf)) + rv; 371 break; 372 } 373 while (n > 0); 374 return rn; 375 } 376 377 protected int 378 file_pipe2file(struct magic_set *ms, int fd, const void *startbuf, 379 size_t nbytes) 380 { 381 char buf[4096]; 382 ssize_t r; 383 int tfd; 384 385 (void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof buf); 386 #ifndef HAVE_MKSTEMP 387 { 388 char *ptr = mktemp(buf); 389 tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600); 390 r = errno; 391 (void)unlink(ptr); 392 errno = r; 393 } 394 #else 395 { 396 int te; 397 tfd = mkstemp(buf); 398 te = errno; 399 (void)unlink(buf); 400 errno = te; 401 } 402 #endif 403 if (tfd == -1) { 404 file_error(ms, errno, 405 "cannot create temporary file for pipe copy"); 406 return -1; 407 } 408 409 if (swrite(tfd, startbuf, nbytes) != (ssize_t)nbytes) 410 r = 1; 411 else { 412 while ((r = sread(fd, buf, sizeof(buf), 1)) > 0) 413 if (swrite(tfd, buf, (size_t)r) != r) 414 break; 415 } 416 417 switch (r) { 418 case -1: 419 file_error(ms, errno, "error copying from pipe to temp file"); 420 return -1; 421 case 0: 422 break; 423 default: 424 file_error(ms, errno, "error while writing to temp file"); 425 return -1; 426 } 427 428 /* 429 * We duplicate the file descriptor, because fclose on a 430 * tmpfile will delete the file, but any open descriptors 431 * can still access the phantom inode. 432 */ 433 if ((fd = dup2(tfd, fd)) == -1) { 434 file_error(ms, errno, "could not dup descriptor for temp file"); 435 return -1; 436 } 437 (void)close(tfd); 438 if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) { 439 file_badseek(ms); 440 return -1; 441 } 442 return fd; 443 } 444 #if HAVE_FORK 445 #ifdef BUILTIN_DECOMPRESS 446 447 #define FHCRC (1 << 1) 448 #define FEXTRA (1 << 2) 449 #define FNAME (1 << 3) 450 #define FCOMMENT (1 << 4) 451 452 453 private int 454 uncompressgzipped(const unsigned char *old, unsigned char **newch, 455 size_t bytes_max, size_t *n) 456 { 457 unsigned char flg = old[3]; 458 size_t data_start = 10; 459 460 if (flg & FEXTRA) { 461 if (data_start + 1 >= *n) 462 goto err; 463 data_start += 2 + old[data_start] + old[data_start + 1] * 256; 464 } 465 if (flg & FNAME) { 466 while(data_start < *n && old[data_start]) 467 data_start++; 468 data_start++; 469 } 470 if (flg & FCOMMENT) { 471 while(data_start < *n && old[data_start]) 472 data_start++; 473 data_start++; 474 } 475 if (flg & FHCRC) 476 data_start += 2; 477 478 if (data_start >= *n) 479 goto err; 480 481 *n -= data_start; 482 old += data_start; 483 return uncompresszlib(old, newch, bytes_max, n, 0); 484 err: 485 return makeerror(newch, n, "File too short"); 486 } 487 488 private int 489 uncompresszlib(const unsigned char *old, unsigned char **newch, 490 size_t bytes_max, size_t *n, int zlib) 491 { 492 int rc; 493 z_stream z; 494 495 if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL) 496 return makeerror(newch, n, "No buffer, %s", strerror(errno)); 497 498 z.next_in = CCAST(Bytef *, old); 499 z.avail_in = CAST(uint32_t, *n); 500 z.next_out = *newch; 501 z.avail_out = CAST(unsigned int, bytes_max); 502 z.zalloc = Z_NULL; 503 z.zfree = Z_NULL; 504 z.opaque = Z_NULL; 505 506 /* LINTED bug in header macro */ 507 rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15); 508 if (rc != Z_OK) 509 goto err; 510 511 rc = inflate(&z, Z_SYNC_FLUSH); 512 if (rc != Z_OK && rc != Z_STREAM_END) 513 goto err; 514 515 *n = (size_t)z.total_out; 516 rc = inflateEnd(&z); 517 if (rc != Z_OK) 518 goto err; 519 520 /* let's keep the nul-terminate tradition */ 521 (*newch)[*n] = '\0'; 522 523 return OKDATA; 524 err: 525 strlcpy((char *)*newch, z.msg ? z.msg : zError(rc), bytes_max); 526 *n = strlen((char *)*newch); 527 return ERRDATA; 528 } 529 #endif 530 531 static int 532 makeerror(unsigned char **buf, size_t *len, const char *fmt, ...) 533 { 534 char *msg; 535 va_list ap; 536 int rv; 537 538 va_start(ap, fmt); 539 rv = vasprintf(&msg, fmt, ap); 540 va_end(ap); 541 if (rv < 0) { 542 *buf = NULL; 543 *len = 0; 544 return NODATA; 545 } 546 *buf = (unsigned char *)msg; 547 *len = strlen(msg); 548 return ERRDATA; 549 } 550 551 static void 552 closefd(int *fd, size_t i) 553 { 554 if (fd[i] == -1) 555 return; 556 (void) close(fd[i]); 557 fd[i] = -1; 558 } 559 560 static void 561 closep(int *fd) 562 { 563 size_t i; 564 for (i = 0; i < 2; i++) 565 closefd(fd, i); 566 } 567 568 static void 569 copydesc(int i, int *fd) 570 { 571 int j = fd[i == STDIN_FILENO ? 0 : 1]; 572 if (j == i) 573 return; 574 if (dup2(j, i) == -1) { 575 DPRINTF("dup(%d, %d) failed (%s)\n", j, i, strerror(errno)); 576 exit(1); 577 } 578 closep(fd); 579 } 580 581 static void 582 writechild(int fdp[3][2], const void *old, size_t n) 583 { 584 int status; 585 586 closefd(fdp[STDIN_FILENO], 0); 587 /* 588 * fork again, to avoid blocking because both 589 * pipes filled 590 */ 591 switch (fork()) { 592 case 0: /* child */ 593 closefd(fdp[STDOUT_FILENO], 0); 594 if (swrite(fdp[STDIN_FILENO][1], old, n) != (ssize_t)n) { 595 DPRINTF("Write failed (%s)\n", strerror(errno)); 596 exit(1); 597 } 598 exit(0); 599 /*NOTREACHED*/ 600 601 case -1: 602 DPRINTF("Fork failed (%s)\n", strerror(errno)); 603 exit(1); 604 /*NOTREACHED*/ 605 606 default: /* parent */ 607 if (wait(&status) == -1) { 608 DPRINTF("Wait failed (%s)\n", strerror(errno)); 609 exit(1); 610 } 611 DPRINTF("Grandchild wait return %#x\n", status); 612 } 613 closefd(fdp[STDIN_FILENO], 1); 614 } 615 616 static ssize_t 617 filter_error(unsigned char *ubuf, ssize_t n) 618 { 619 char *p; 620 char *buf; 621 622 ubuf[n] = '\0'; 623 buf = (char *)ubuf; 624 while (isspace((unsigned char)*buf)) 625 buf++; 626 DPRINTF("Filter error[[[%s]]]\n", buf); 627 if ((p = strchr((char *)buf, '\n')) != NULL) 628 *p = '\0'; 629 if ((p = strchr((char *)buf, ';')) != NULL) 630 *p = '\0'; 631 if ((p = strrchr((char *)buf, ':')) != NULL) { 632 ++p; 633 while (isspace((unsigned char)*p)) 634 p++; 635 n = strlen(p); 636 memmove(ubuf, p, CAST(size_t, n + 1)); 637 } 638 DPRINTF("Filter error after[[[%s]]]\n", (char *)ubuf); 639 if (islower(*ubuf)) 640 *ubuf = toupper(*ubuf); 641 return n; 642 } 643 644 private const char * 645 methodname(size_t method) 646 { 647 #ifdef BUILTIN_DECOMPRESS 648 /* FIXME: This doesn't cope with bzip2 */ 649 if (method == 2 || compr[method].maglen == 0) 650 return "zlib"; 651 #endif 652 return compr[method].argv[0]; 653 } 654 655 private int 656 uncompressbuf(int fd, size_t bytes_max, size_t method, const unsigned char *old, 657 unsigned char **newch, size_t* n) 658 { 659 int fdp[3][2]; 660 int status, rv; 661 size_t i; 662 ssize_t r; 663 664 #ifdef BUILTIN_DECOMPRESS 665 /* FIXME: This doesn't cope with bzip2 */ 666 if (method == 2) 667 return uncompressgzipped(old, newch, bytes_max, n); 668 if (compr[method].maglen == 0) 669 return uncompresszlib(old, newch, bytes_max, n, 1); 670 #endif 671 (void)fflush(stdout); 672 (void)fflush(stderr); 673 674 for (i = 0; i < __arraycount(fdp); i++) 675 fdp[i][0] = fdp[i][1] = -1; 676 677 if ((fd == -1 && pipe(fdp[STDIN_FILENO]) == -1) || 678 pipe(fdp[STDOUT_FILENO]) == -1 || pipe(fdp[STDERR_FILENO]) == -1) { 679 closep(fdp[STDIN_FILENO]); 680 closep(fdp[STDOUT_FILENO]); 681 return makeerror(newch, n, "Cannot create pipe, %s", 682 strerror(errno)); 683 } 684 switch (fork()) { 685 case 0: /* child */ 686 if (fd != -1) { 687 fdp[STDIN_FILENO][0] = fd; 688 (void) lseek(fd, (off_t)0, SEEK_SET); 689 } 690 691 for (i = 0; i < __arraycount(fdp); i++) 692 copydesc(CAST(int, i), fdp[i]); 693 694 (void)execvp(compr[method].argv[0], 695 (char *const *)(intptr_t)compr[method].argv); 696 dprintf(STDERR_FILENO, "exec `%s' failed, %s", 697 compr[method].argv[0], strerror(errno)); 698 exit(1); 699 /*NOTREACHED*/ 700 case -1: 701 return makeerror(newch, n, "Cannot fork, %s", 702 strerror(errno)); 703 704 default: /* parent */ 705 for (i = 1; i < __arraycount(fdp); i++) 706 closefd(fdp[i], 1); 707 708 /* Write the buffer data to the child, if we don't have fd */ 709 if (fd == -1) 710 writechild(fdp, old, *n); 711 712 *newch = CAST(unsigned char *, malloc(bytes_max + 1)); 713 if (*newch == NULL) { 714 rv = makeerror(newch, n, "No buffer, %s", 715 strerror(errno)); 716 goto err; 717 } 718 rv = OKDATA; 719 if ((r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0)) > 0) 720 break; 721 DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0], 722 r != -1 ? strerror(errno) : "no data"); 723 724 rv = ERRDATA; 725 if (r == 0 && 726 (r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0) 727 { 728 r = filter_error(*newch, r); 729 break; 730 } 731 free(*newch); 732 if (r == 0) 733 rv = makeerror(newch, n, "Read failed, %s", 734 strerror(errno)); 735 else 736 rv = makeerror(newch, n, "No data"); 737 goto err; 738 } 739 740 *n = r; 741 /* NUL terminate, as every buffer is handled here. */ 742 (*newch)[*n] = '\0'; 743 err: 744 closefd(fdp[STDIN_FILENO], 1); 745 closefd(fdp[STDOUT_FILENO], 0); 746 closefd(fdp[STDERR_FILENO], 0); 747 if (wait(&status) == -1) { 748 free(*newch); 749 rv = makeerror(newch, n, "Wait failed, %s", strerror(errno)); 750 DPRINTF("Child wait return %#x\n", status); 751 } else if (!WIFEXITED(status)) { 752 DPRINTF("Child not exited (%#x)\n", status); 753 } else if (WEXITSTATUS(status) != 0) { 754 DPRINTF("Child exited (%#x)\n", WEXITSTATUS(status)); 755 } 756 757 closefd(fdp[STDIN_FILENO], 0); 758 DPRINTF("Returning %p n=%zu rv=%d\n", *newch, *n, rv); 759 760 return rv; 761 } 762 #endif 763