src/basic/fileio.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2010 Lennart Poettering
   4 ***/
   5
   6 #include <errno.h>
   7 #include <fcntl.h>
   8 #include <limits.h>
   9 #include <stdarg.h>
  10 #include <stdint.h>
  11 #include <stdio_ext.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/mman.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <unistd.h>
  18
  19 #include "alloc-util.h"
  20 #include "ctype.h"
  21 #include "def.h"
  22 #include "env-util.h"
  23 #include "escape.h"
  24 #include "fd-util.h"
  25 #include "fileio.h"
  26 #include "fs-util.h"
  27 #include "hexdecoct.h"
  28 #include "log.h"
  29 #include "macro.h"
  30 #include "missing.h"
  31 #include "parse-util.h"
  32 #include "path-util.h"
  33 #include "process-util.h"
  34 #include "random-util.h"
  35 #include "stdio-util.h"
  36 #include "string-util.h"
  37 #include "strv.h"
  38 #include "time-util.h"
  39 #include "umask-util.h"
  40 #include "utf8.h"
  41
  42 #define READ_FULL_BYTES_MAX (4U*1024U*1024U)
  43
  44 int write_string_stream_ts(
  45                 FILE *f,
  46                 const char *line,
  47                 WriteStringFileFlags flags,
  48                 struct timespec *ts) {
  49
  50         bool needs_nl;
  51         int r;
  52
  53         assert(f);
  54         assert(line);
  55
  56         if (ferror(f))
  57                 return -EIO;
  58
  59         needs_nl = !(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n");
  60
  61         if (needs_nl && (flags & WRITE_STRING_FILE_DISABLE_BUFFER)) {
  62                 /* If STDIO buffering was disabled, then let's append the newline character to the string itself, so
  63                  * that the write goes out in one go, instead of two */
  64
  65                 line = strjoina(line, "\n");
  66                 needs_nl = false;
  67         }
  68
  69         if (fputs(line, f) == EOF)
  70                 return -errno;
  71
  72         if (needs_nl)
  73                 if (fputc('\n', f) == EOF)
  74                         return -errno;
  75
  76         if (flags & WRITE_STRING_FILE_SYNC)
  77                 r = fflush_sync_and_check(f);
  78         else
  79                 r = fflush_and_check(f);
  80         if (r < 0)
  81                 return r;
  82
  83         if (ts) {
  84                 struct timespec twice[2] = {*ts, *ts};
  85
  86                 if (futimens(fileno(f), twice) < 0)
  87                         return -errno;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int write_string_file_atomic(
  94                 const char *fn,
  95                 const char *line,
  96                 WriteStringFileFlags flags,
  97                 struct timespec *ts) {
  98
  99         _cleanup_fclose_ FILE *f = NULL;
 100         _cleanup_free_ char *p = NULL;
 101         int r;
 102
 103         assert(fn);
 104         assert(line);
 105
 106         r = fopen_temporary(fn, &f, &p);
 107         if (r < 0)
 108                 return r;
 109
 110         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 111         (void) fchmod_umask(fileno(f), 0644);
 112
 113         r = write_string_stream_ts(f, line, flags, ts);
 114         if (r < 0)
 115                 goto fail;
 116
 117         if (rename(p, fn) < 0) {
 118                 r = -errno;
 119                 goto fail;
 120         }
 121
 122         return 0;
 123
 124 fail:
 125         (void) unlink(p);
 126         return r;
 127 }
 128
 129 int write_string_file_ts(
 130                 const char *fn,
 131                 const char *line,
 132                 WriteStringFileFlags flags,
 133                 struct timespec *ts) {
 134
 135         _cleanup_fclose_ FILE *f = NULL;
 136         int q, r;
 137
 138         assert(fn);
 139         assert(line);
 140
 141         /* We don't know how to verify whether the file contents was already on-disk. */
 142         assert(!((flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE) && (flags & WRITE_STRING_FILE_SYNC)));
 143
 144         if (flags & WRITE_STRING_FILE_ATOMIC) {
 145                 assert(flags & WRITE_STRING_FILE_CREATE);
 146
 147                 r = write_string_file_atomic(fn, line, flags, ts);
 148                 if (r < 0)
 149                         goto fail;
 150
 151                 return r;
 152         } else
 153                 assert(!ts);
 154
 155         if (flags & WRITE_STRING_FILE_CREATE) {
 156                 f = fopen(fn, "we");
 157                 if (!f) {
 158                         r = -errno;
 159                         goto fail;
 160                 }
 161         } else {
 162                 int fd;
 163
 164                 /* We manually build our own version of fopen(..., "we") that
 165                  * works without O_CREAT */
 166                 fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY);
 167                 if (fd < 0) {
 168                         r = -errno;
 169                         goto fail;
 170                 }
 171
 172                 f = fdopen(fd, "we");
 173                 if (!f) {
 174                         r = -errno;
 175                         safe_close(fd);
 176                         goto fail;
 177                 }
 178         }
 179
 180         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 181
 182         if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
 183                 setvbuf(f, NULL, _IONBF, 0);
 184
 185         r = write_string_stream_ts(f, line, flags, ts);
 186         if (r < 0)
 187                 goto fail;
 188
 189         return 0;
 190
 191 fail:
 192         if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE))
 193                 return r;
 194
 195         f = safe_fclose(f);
 196
 197         /* OK, the operation failed, but let's see if the right
 198          * contents in place already. If so, eat up the error. */
 199
 200         q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
 201         if (q <= 0)
 202                 return r;
 203
 204         return 0;
 205 }
 206
 207 int write_string_filef(
 208                 const char *fn,
 209                 WriteStringFileFlags flags,
 210                 const char *format, ...) {
 211
 212         _cleanup_free_ char *p = NULL;
 213         va_list ap;
 214         int r;
 215
 216         va_start(ap, format);
 217         r = vasprintf(&p, format, ap);
 218         va_end(ap);
 219
 220         if (r < 0)
 221                 return -ENOMEM;
 222
 223         return write_string_file(fn, p, flags);
 224 }
 225
 226 int read_one_line_file(const char *fn, char **line) {
 227         _cleanup_fclose_ FILE *f = NULL;
 228         int r;
 229
 230         assert(fn);
 231         assert(line);
 232
 233         f = fopen(fn, "re");
 234         if (!f)
 235                 return -errno;
 236
 237         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 238
 239         r = read_line(f, LONG_LINE_MAX, line);
 240         return r < 0 ? r : 0;
 241 }
 242
 243 int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
 244         _cleanup_fclose_ FILE *f = NULL;
 245         _cleanup_free_ char *buf = NULL;
 246         size_t l, k;
 247
 248         assert(fn);
 249         assert(blob);
 250
 251         l = strlen(blob);
 252
 253         if (accept_extra_nl && endswith(blob, "\n"))
 254                 accept_extra_nl = false;
 255
 256         buf = malloc(l + accept_extra_nl + 1);
 257         if (!buf)
 258                 return -ENOMEM;
 259
 260         f = fopen(fn, "re");
 261         if (!f)
 262                 return -errno;
 263
 264         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 265
 266         /* We try to read one byte more than we need, so that we know whether we hit eof */
 267         errno = 0;
 268         k = fread(buf, 1, l + accept_extra_nl + 1, f);
 269         if (ferror(f))
 270                 return errno > 0 ? -errno : -EIO;
 271
 272         if (k != l && k != l + accept_extra_nl)
 273                 return 0;
 274         if (memcmp(buf, blob, l) != 0)
 275                 return 0;
 276         if (k > l && buf[l] != '\n')
 277                 return 0;
 278
 279         return 1;
 280 }
 281
 282 int read_full_stream(FILE *f, char **contents, size_t *size) {
 283         _cleanup_free_ char *buf = NULL;
 284         struct stat st;
 285         size_t n, l;
 286         int fd;
 287
 288         assert(f);
 289         assert(contents);
 290
 291         n = LINE_MAX;
 292
 293         fd = fileno(f);
 294         if (fd >= 0) { /* If the FILE* object is backed by an fd (as opposed to memory or such, see fmemopen(), let's
 295                         * optimize our buffering) */
 296
 297                 if (fstat(fileno(f), &st) < 0)
 298                         return -errno;
 299
 300                 if (S_ISREG(st.st_mode)) {
 301
 302                         /* Safety check */
 303                         if (st.st_size > READ_FULL_BYTES_MAX)
 304                                 return -E2BIG;
 305
 306                         /* Start with the right file size, but be prepared for files from /proc which generally report a file
 307                          * size of 0. Note that we increase the size to read here by one, so that the first read attempt
 308                          * already makes us notice the EOF. */
 309                         if (st.st_size > 0)
 310                                 n = st.st_size + 1;
 311                 }
 312         }
 313
 314         l = 0;
 315         for (;;) {
 316                 char *t;
 317                 size_t k;
 318
 319                 t = realloc(buf, n + 1);
 320                 if (!t)
 321                         return -ENOMEM;
 322
 323                 buf = t;
 324                 errno = 0;
 325                 k = fread(buf + l, 1, n - l, f);
 326                 if (k > 0)
 327                         l += k;
 328
 329                 if (ferror(f))
 330                         return errno > 0 ? -errno : -EIO;
 331
 332                 if (feof(f))
 333                         break;
 334
 335                 /* We aren't expecting fread() to return a short read outside
 336                  * of (error && eof), assert buffer is full and enlarge buffer.
 337                  */
 338                 assert(l == n);
 339
 340                 /* Safety check */
 341                 if (n >= READ_FULL_BYTES_MAX)
 342                         return -E2BIG;
 343
 344                 n = MIN(n * 2, READ_FULL_BYTES_MAX);
 345         }
 346
 347         buf[l] = 0;
 348         *contents = TAKE_PTR(buf);
 349
 350         if (size)
 351                 *size = l;
 352
 353         return 0;
 354 }
 355
 356 int read_full_file(const char *fn, char **contents, size_t *size) {
 357         _cleanup_fclose_ FILE *f = NULL;
 358
 359         assert(fn);
 360         assert(contents);
 361
 362         f = fopen(fn, "re");
 363         if (!f)
 364                 return -errno;
 365
 366         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 367
 368         return read_full_stream(f, contents, size);
 369 }
 370
 371 static int parse_env_file_internal(
 372                 FILE *f,
 373                 const char *fname,
 374                 const char *newline,
 375                 int (*push) (const char *filename, unsigned line,
 376                              const char *key, char *value, void *userdata, int *n_pushed),
 377                 void *userdata,
 378                 int *n_pushed) {
 379
 380         size_t key_alloc = 0, n_key = 0, value_alloc = 0, n_value = 0, last_value_whitespace = (size_t) -1, last_key_whitespace = (size_t) -1;
 381         _cleanup_free_ char *contents = NULL, *key = NULL, *value = NULL;
 382         unsigned line = 1;
 383         char *p;
 384         int r;
 385
 386         enum {
 387                 PRE_KEY,
 388                 KEY,
 389                 PRE_VALUE,
 390                 VALUE,
 391                 VALUE_ESCAPE,
 392                 SINGLE_QUOTE_VALUE,
 393                 SINGLE_QUOTE_VALUE_ESCAPE,
 394                 DOUBLE_QUOTE_VALUE,
 395                 DOUBLE_QUOTE_VALUE_ESCAPE,
 396                 COMMENT,
 397                 COMMENT_ESCAPE
 398         } state = PRE_KEY;
 399
 400         assert(newline);
 401
 402         if (f)
 403                 r = read_full_stream(f, &contents, NULL);
 404         else
 405                 r = read_full_file(fname, &contents, NULL);
 406         if (r < 0)
 407                 return r;
 408
 409         for (p = contents; *p; p++) {
 410                 char c = *p;
 411
 412                 switch (state) {
 413
 414                 case PRE_KEY:
 415                         if (strchr(COMMENTS, c))
 416                                 state = COMMENT;
 417                         else if (!strchr(WHITESPACE, c)) {
 418                                 state = KEY;
 419                                 last_key_whitespace = (size_t) -1;
 420
 421                                 if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
 422                                         return -ENOMEM;
 423
 424                                 key[n_key++] = c;
 425                         }
 426                         break;
 427
 428                 case KEY:
 429                         if (strchr(newline, c)) {
 430                                 state = PRE_KEY;
 431                                 line++;
 432                                 n_key = 0;
 433                         } else if (c == '=') {
 434                                 state = PRE_VALUE;
 435                                 last_value_whitespace = (size_t) -1;
 436                         } else {
 437                                 if (!strchr(WHITESPACE, c))
 438                                         last_key_whitespace = (size_t) -1;
 439                                 else if (last_key_whitespace == (size_t) -1)
 440                                          last_key_whitespace = n_key;
 441
 442                                 if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
 443                                         return -ENOMEM;
 444
 445                                 key[n_key++] = c;
 446                         }
 447
 448                         break;
 449
 450                 case PRE_VALUE:
 451                         if (strchr(newline, c)) {
 452                                 state = PRE_KEY;
 453                                 line++;
 454                                 key[n_key] = 0;
 455
 456                                 if (value)
 457                                         value[n_value] = 0;
 458
 459                                 /* strip trailing whitespace from key */
 460                                 if (last_key_whitespace != (size_t) -1)
 461                                         key[last_key_whitespace] = 0;
 462
 463                                 r = push(fname, line, key, value, userdata, n_pushed);
 464                                 if (r < 0)
 465                                         return r;
 466
 467                                 n_key = 0;
 468                                 value = NULL;
 469                                 value_alloc = n_value = 0;
 470
 471                         } else if (c == '\'')
 472                                 state = SINGLE_QUOTE_VALUE;
 473                         else if (c == '\"')
 474                                 state = DOUBLE_QUOTE_VALUE;
 475                         else if (c == '\\')
 476                                 state = VALUE_ESCAPE;
 477                         else if (!strchr(WHITESPACE, c)) {
 478                                 state = VALUE;
 479
 480                                 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
 481                                         return  -ENOMEM;
 482
 483                                 value[n_value++] = c;
 484                         }
 485
 486                         break;
 487
 488                 case VALUE:
 489                         if (strchr(newline, c)) {
 490                                 state = PRE_KEY;
 491                                 line++;
 492
 493                                 key[n_key] = 0;
 494
 495                                 if (value)
 496                                         value[n_value] = 0;
 497
 498                                 /* Chomp off trailing whitespace from value */
 499                                 if (last_value_whitespace != (size_t) -1)
 500                                         value[last_value_whitespace] = 0;
 501
 502                                 /* strip trailing whitespace from key */
 503                                 if (last_key_whitespace != (size_t) -1)
 504                                         key[last_key_whitespace] = 0;
 505
 506                                 r = push(fname, line, key, value, userdata, n_pushed);
 507                                 if (r < 0)
 508                                         return r;
 509
 510                                 n_key = 0;
 511                                 value = NULL;
 512                                 value_alloc = n_value = 0;
 513
 514                         } else if (c == '\\') {
 515                                 state = VALUE_ESCAPE;
 516                                 last_value_whitespace = (size_t) -1;
 517                         } else {
 518                                 if (!strchr(WHITESPACE, c))
 519                                         last_value_whitespace = (size_t) -1;
 520                                 else if (last_value_whitespace == (size_t) -1)
 521                                         last_value_whitespace = n_value;
 522
 523                                 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
 524                                         return -ENOMEM;
 525
 526                                 value[n_value++] = c;
 527                         }
 528
 529                         break;
 530
 531                 case VALUE_ESCAPE:
 532                         state = VALUE;
 533
 534                         if (!strchr(newline, c)) {
 535                                 /* Escaped newlines we eat up entirely */
 536                                 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
 537                                         return -ENOMEM;
 538
 539                                 value[n_value++] = c;
 540                         }
 541                         break;
 542
 543                 case SINGLE_QUOTE_VALUE:
 544                         if (c == '\'')
 545                                 state = PRE_VALUE;
 546                         else if (c == '\\')
 547                                 state = SINGLE_QUOTE_VALUE_ESCAPE;
 548                         else {
 549                                 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
 550                                         return -ENOMEM;
 551
 552                                 value[n_value++] = c;
 553                         }
 554
 555                         break;
 556
 557                 case SINGLE_QUOTE_VALUE_ESCAPE:
 558                         state = SINGLE_QUOTE_VALUE;
 559
 560                         if (!strchr(newline, c)) {
 561                                 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
 562                                         return -ENOMEM;
 563
 564                                 value[n_value++] = c;
 565                         }
 566                         break;
 567
 568                 case DOUBLE_QUOTE_VALUE:
 569                         if (c == '\"')
 570                                 state = PRE_VALUE;
 571                         else if (c == '\\')
 572                                 state = DOUBLE_QUOTE_VALUE_ESCAPE;
 573                         else {
 574                                 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
 575                                         return -ENOMEM;
 576
 577                                 value[n_value++] = c;
 578                         }
 579
 580                         break;
 581
 582                 case DOUBLE_QUOTE_VALUE_ESCAPE:
 583                         state = DOUBLE_QUOTE_VALUE;
 584
 585                         if (!strchr(newline, c)) {
 586                                 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
 587                                         return -ENOMEM;
 588
 589                                 value[n_value++] = c;
 590                         }
 591                         break;
 592
 593                 case COMMENT:
 594                         if (c == '\\')
 595                                 state = COMMENT_ESCAPE;
 596                         else if (strchr(newline, c)) {
 597                                 state = PRE_KEY;
 598                                 line++;
 599                         }
 600                         break;
 601
 602                 case COMMENT_ESCAPE:
 603                         state = COMMENT;
 604                         break;
 605                 }
 606         }
 607
 608         if (IN_SET(state,
 609                    PRE_VALUE,
 610                    VALUE,
 611                    VALUE_ESCAPE,
 612                    SINGLE_QUOTE_VALUE,
 613                    SINGLE_QUOTE_VALUE_ESCAPE,
 614                    DOUBLE_QUOTE_VALUE,
 615                    DOUBLE_QUOTE_VALUE_ESCAPE)) {
 616
 617                 key[n_key] = 0;
 618
 619                 if (value)
 620                         value[n_value] = 0;
 621
 622                 if (state == VALUE)
 623                         if (last_value_whitespace != (size_t) -1)
 624                                 value[last_value_whitespace] = 0;
 625
 626                 /* strip trailing whitespace from key */
 627                 if (last_key_whitespace != (size_t) -1)
 628                         key[last_key_whitespace] = 0;
 629
 630                 r = push(fname, line, key, value, userdata, n_pushed);
 631                 if (r < 0)
 632                         return r;
 633
 634                 value = NULL;
 635         }
 636
 637         return 0;
 638 }
 639
 640 static int check_utf8ness_and_warn(
 641                 const char *filename, unsigned line,
 642                 const char *key, char *value) {
 643
 644         if (!utf8_is_valid(key)) {
 645                 _cleanup_free_ char *p = NULL;
 646
 647                 p = utf8_escape_invalid(key);
 648                 log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
 649                 return -EINVAL;
 650         }
 651
 652         if (value && !utf8_is_valid(value)) {
 653                 _cleanup_free_ char *p = NULL;
 654
 655                 p = utf8_escape_invalid(value);
 656                 log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
 657                 return -EINVAL;
 658         }
 659
 660         return 0;
 661 }
 662
 663 static int parse_env_file_push(
 664                 const char *filename, unsigned line,
 665                 const char *key, char *value,
 666                 void *userdata,
 667                 int *n_pushed) {
 668
 669         const char *k;
 670         va_list aq, *ap = userdata;
 671         int r;
 672
 673         r = check_utf8ness_and_warn(filename, line, key, value);
 674         if (r < 0)
 675                 return r;
 676
 677         va_copy(aq, *ap);
 678
 679         while ((k = va_arg(aq, const char *))) {
 680                 char **v;
 681
 682                 v = va_arg(aq, char **);
 683
 684                 if (streq(key, k)) {
 685                         va_end(aq);
 686                         free(*v);
 687                         *v = value;
 688
 689                         if (n_pushed)
 690                                 (*n_pushed)++;
 691
 692                         return 1;
 693                 }
 694         }
 695
 696         va_end(aq);
 697         free(value);
 698
 699         return 0;
 700 }
 701
 702 int parse_env_filev(
 703                 FILE *f,
 704                 const char *fname,
 705                 const char *newline,
 706                 va_list ap) {
 707
 708         int r, n_pushed = 0;
 709         va_list aq;
 710
 711         if (!newline)
 712                 newline = NEWLINE;
 713
 714         va_copy(aq, ap);
 715         r = parse_env_file_internal(f, fname, newline, parse_env_file_push, &aq, &n_pushed);
 716         va_end(aq);
 717         if (r < 0)
 718                 return r;
 719
 720         return n_pushed;
 721 }
 722
 723 int parse_env_file(
 724                 FILE *f,
 725                 const char *fname,
 726                 const char *newline,
 727                 ...) {
 728
 729         va_list ap;
 730         int r;
 731
 732         va_start(ap, newline);
 733         r = parse_env_filev(f, fname, newline, ap);
 734         va_end(ap);
 735
 736         return r;
 737 }
 738
 739 static int load_env_file_push(
 740                 const char *filename, unsigned line,
 741                 const char *key, char *value,
 742                 void *userdata,
 743                 int *n_pushed) {
 744         char ***m = userdata;
 745         char *p;
 746         int r;
 747
 748         r = check_utf8ness_and_warn(filename, line, key, value);
 749         if (r < 0)
 750                 return r;
 751
 752         p = strjoin(key, "=", value);
 753         if (!p)
 754                 return -ENOMEM;
 755
 756         r = strv_env_replace(m, p);
 757         if (r < 0) {
 758                 free(p);
 759                 return r;
 760         }
 761
 762         if (n_pushed)
 763                 (*n_pushed)++;
 764
 765         free(value);
 766         return 0;
 767 }
 768
 769 int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
 770         char **m = NULL;
 771         int r;
 772
 773         if (!newline)
 774                 newline = NEWLINE;
 775
 776         r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL);
 777         if (r < 0) {
 778                 strv_free(m);
 779                 return r;
 780         }
 781
 782         *rl = m;
 783         return 0;
 784 }
 785
 786 static int load_env_file_push_pairs(
 787                 const char *filename, unsigned line,
 788                 const char *key, char *value,
 789                 void *userdata,
 790                 int *n_pushed) {
 791         char ***m = userdata;
 792         int r;
 793
 794         r = check_utf8ness_and_warn(filename, line, key, value);
 795         if (r < 0)
 796                 return r;
 797
 798         r = strv_extend(m, key);
 799         if (r < 0)
 800                 return -ENOMEM;
 801
 802         if (!value) {
 803                 r = strv_extend(m, "");
 804                 if (r < 0)
 805                         return -ENOMEM;
 806         } else {
 807                 r = strv_push(m, value);
 808                 if (r < 0)
 809                         return r;
 810         }
 811
 812         if (n_pushed)
 813                 (*n_pushed)++;
 814
 815         return 0;
 816 }
 817
 818 int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) {
 819         char **m = NULL;
 820         int r;
 821
 822         if (!newline)
 823                 newline = NEWLINE;
 824
 825         r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL);
 826         if (r < 0) {
 827                 strv_free(m);
 828                 return r;
 829         }
 830
 831         *rl = m;
 832         return 0;
 833 }
 834
 835 static int merge_env_file_push(
 836                 const char *filename, unsigned line,
 837                 const char *key, char *value,
 838                 void *userdata,
 839                 int *n_pushed) {
 840
 841         char ***env = userdata;
 842         char *expanded_value;
 843
 844         assert(env);
 845
 846         if (!value) {
 847                 log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key);
 848                 return 0;
 849         }
 850
 851         if (!env_name_is_valid(key)) {
 852                 log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key);
 853                 free(value);
 854                 return 0;
 855         }
 856
 857         expanded_value = replace_env(value, *env,
 858                                      REPLACE_ENV_USE_ENVIRONMENT|
 859                                      REPLACE_ENV_ALLOW_BRACELESS|
 860                                      REPLACE_ENV_ALLOW_EXTENDED);
 861         if (!expanded_value)
 862                 return -ENOMEM;
 863
 864         free_and_replace(value, expanded_value);
 865
 866         return load_env_file_push(filename, line, key, value, env, n_pushed);
 867 }
 868
 869 int merge_env_file(
 870                 char ***env,
 871                 FILE *f,
 872                 const char *fname) {
 873
 874         /* NOTE: this function supports braceful and braceless variable expansions,
 875          * plus "extended" substitutions, unlike other exported parsing functions.
 876          */
 877
 878         return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL);
 879 }
 880
 881 static void write_env_var(FILE *f, const char *v) {
 882         const char *p;
 883
 884         p = strchr(v, '=');
 885         if (!p) {
 886                 /* Fallback */
 887                 fputs_unlocked(v, f);
 888                 fputc_unlocked('\n', f);
 889                 return;
 890         }
 891
 892         p++;
 893         fwrite_unlocked(v, 1, p-v, f);
 894
 895         if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
 896                 fputc_unlocked('\"', f);
 897
 898                 for (; *p; p++) {
 899                         if (strchr(SHELL_NEED_ESCAPE, *p))
 900                                 fputc_unlocked('\\', f);
 901
 902                         fputc_unlocked(*p, f);
 903                 }
 904
 905                 fputc_unlocked('\"', f);
 906         } else
 907                 fputs_unlocked(p, f);
 908
 909         fputc_unlocked('\n', f);
 910 }
 911
 912 int write_env_file(const char *fname, char **l) {
 913         _cleanup_fclose_ FILE *f = NULL;
 914         _cleanup_free_ char *p = NULL;
 915         char **i;
 916         int r;
 917
 918         assert(fname);
 919
 920         r = fopen_temporary(fname, &f, &p);
 921         if (r < 0)
 922                 return r;
 923
 924         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 925         (void) fchmod_umask(fileno(f), 0644);
 926
 927         STRV_FOREACH(i, l)
 928                 write_env_var(f, *i);
 929
 930         r = fflush_and_check(f);
 931         if (r >= 0) {
 932                 if (rename(p, fname) >= 0)
 933                         return 0;
 934
 935                 r = -errno;
 936         }
 937
 938         unlink(p);
 939         return r;
 940 }
 941
 942 int executable_is_script(const char *path, char **interpreter) {
 943         _cleanup_free_ char *line = NULL;
 944         size_t len;
 945         char *ans;
 946         int r;
 947
 948         assert(path);
 949
 950         r = read_one_line_file(path, &line);
 951         if (r == -ENOBUFS) /* First line overly long? if so, then it's not a script */
 952                 return 0;
 953         if (r < 0)
 954                 return r;
 955
 956         if (!startswith(line, "#!"))
 957                 return 0;
 958
 959         ans = strstrip(line + 2);
 960         len = strcspn(ans, " \t");
 961
 962         if (len == 0)
 963                 return 0;
 964
 965         ans = strndup(ans, len);
 966         if (!ans)
 967                 return -ENOMEM;
 968
 969         *interpreter = ans;
 970         return 1;
 971 }
 972
 973 /**
 974  * Retrieve one field from a file like /proc/self/status.  pattern
 975  * should not include whitespace or the delimiter (':'). pattern matches only
 976  * the beginning of a line. Whitespace before ':' is skipped. Whitespace and
 977  * zeros after the ':' will be skipped. field must be freed afterwards.
 978  * terminator specifies the terminating characters of the field value (not
 979  * included in the value).
 980  */
 981 int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) {
 982         _cleanup_free_ char *status = NULL;
 983         char *t, *f;
 984         size_t len;
 985         int r;
 986
 987         assert(terminator);
 988         assert(filename);
 989         assert(pattern);
 990         assert(field);
 991
 992         r = read_full_file(filename, &status, NULL);
 993         if (r < 0)
 994                 return r;
 995
 996         t = status;
 997
 998         do {
 999                 bool pattern_ok;
1000
1001                 do {
1002                         t = strstr(t, pattern);
1003                         if (!t)
1004                                 return -ENOENT;
1005
1006                         /* Check that pattern occurs in beginning of line. */
1007                         pattern_ok = (t == status || t[-1] == '\n');
1008
1009                         t += strlen(pattern);
1010
1011                 } while (!pattern_ok);
1012
1013                 t += strspn(t, " \t");
1014                 if (!*t)
1015                         return -ENOENT;
1016
1017         } while (*t != ':');
1018
1019         t++;
1020
1021         if (*t) {
1022                 t += strspn(t, " \t");
1023
1024                 /* Also skip zeros, because when this is used for
1025                  * capabilities, we don't want the zeros. This way the
1026                  * same capability set always maps to the same string,
1027                  * irrespective of the total capability set size. For
1028                  * other numbers it shouldn't matter. */
1029                 t += strspn(t, "0");
1030                 /* Back off one char if there's nothing but whitespace
1031                    and zeros */
1032                 if (!*t || isspace(*t))
1033                         t--;
1034         }
1035
1036         len = strcspn(t, terminator);
1037
1038         f = strndup(t, len);
1039         if (!f)
1040                 return -ENOMEM;
1041
1042         *field = f;
1043         return 0;
1044 }
1045
1046 DIR *xopendirat(int fd, const char *name, int flags) {
1047         int nfd;
1048         DIR *d;
1049
1050         assert(!(flags & O_CREAT));
1051
1052         nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
1053         if (nfd < 0)
1054                 return NULL;
1055
1056         d = fdopendir(nfd);
1057         if (!d) {
1058                 safe_close(nfd);
1059                 return NULL;
1060         }
1061
1062         return d;
1063 }
1064
1065 static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
1066         char **i;
1067
1068         assert(path);
1069         assert(mode);
1070         assert(_f);
1071
1072         if (!path_strv_resolve_uniq(search, root))
1073                 return -ENOMEM;
1074
1075         STRV_FOREACH(i, search) {
1076                 _cleanup_free_ char *p = NULL;
1077                 FILE *f;
1078
1079                 if (root)
1080                         p = strjoin(root, *i, "/", path);
1081                 else
1082                         p = strjoin(*i, "/", path);
1083                 if (!p)
1084                         return -ENOMEM;
1085
1086                 f = fopen(p, mode);
1087                 if (f) {
1088                         *_f = f;
1089                         return 0;
1090                 }
1091
1092                 if (errno != ENOENT)
1093                         return -errno;
1094         }
1095
1096         return -ENOENT;
1097 }
1098
1099 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
1100         _cleanup_strv_free_ char **copy = NULL;
1101
1102         assert(path);
1103         assert(mode);
1104         assert(_f);
1105
1106         if (path_is_absolute(path)) {
1107                 FILE *f;
1108
1109                 f = fopen(path, mode);
1110                 if (f) {
1111                         *_f = f;
1112                         return 0;
1113                 }
1114
1115                 return -errno;
1116         }
1117
1118         copy = strv_copy((char**) search);
1119         if (!copy)
1120                 return -ENOMEM;
1121
1122         return search_and_fopen_internal(path, mode, root, copy, _f);
1123 }
1124
1125 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
1126         _cleanup_strv_free_ char **s = NULL;
1127
1128         if (path_is_absolute(path)) {
1129                 FILE *f;
1130
1131                 f = fopen(path, mode);
1132                 if (f) {
1133                         *_f = f;
1134                         return 0;
1135                 }
1136
1137                 return -errno;
1138         }
1139
1140         s = strv_split_nulstr(search);
1141         if (!s)
1142                 return -ENOMEM;
1143
1144         return search_and_fopen_internal(path, mode, root, s, _f);
1145 }
1146
1147 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
1148         FILE *f;
1149         char *t;
1150         int r, fd;
1151
1152         assert(path);
1153         assert(_f);
1154         assert(_temp_path);
1155
1156         r = tempfn_xxxxxx(path, NULL, &t);
1157         if (r < 0)
1158                 return r;
1159
1160         fd = mkostemp_safe(t);
1161         if (fd < 0) {
1162                 free(t);
1163                 return -errno;
1164         }
1165
1166         f = fdopen(fd, "we");
1167         if (!f) {
1168                 unlink_noerrno(t);
1169                 free(t);
1170                 safe_close(fd);
1171                 return -errno;
1172         }
1173
1174         *_f = f;
1175         *_temp_path = t;
1176
1177         return 0;
1178 }
1179
1180 int fflush_and_check(FILE *f) {
1181         assert(f);
1182
1183         errno = 0;
1184         fflush(f);
1185
1186         if (ferror(f))
1187                 return errno > 0 ? -errno : -EIO;
1188
1189         return 0;
1190 }
1191
1192 int fflush_sync_and_check(FILE *f) {
1193         int r;
1194
1195         assert(f);
1196
1197         r = fflush_and_check(f);
1198         if (r < 0)
1199                 return r;
1200
1201         if (fsync(fileno(f)) < 0)
1202                 return -errno;
1203
1204         r = fsync_directory_of_file(fileno(f));
1205         if (r < 0)
1206                 return r;
1207
1208         return 0;
1209 }
1210
1211 /* This is much like mkostemp() but is subject to umask(). */
1212 int mkostemp_safe(char *pattern) {
1213         _cleanup_umask_ mode_t u = 0;
1214         int fd;
1215
1216         assert(pattern);
1217
1218         u = umask(077);
1219
1220         fd = mkostemp(pattern, O_CLOEXEC);
1221         if (fd < 0)
1222                 return -errno;
1223
1224         return fd;
1225 }
1226
1227 int tempfn_xxxxxx(const char *p, const char *extra, char **ret) {
1228         const char *fn;
1229         char *t;
1230
1231         assert(p);
1232         assert(ret);
1233
1234         /*
1235          * Turns this:
1236          *         /foo/bar/waldo
1237          *
1238          * Into this:
1239          *         /foo/bar/.#<extra>waldoXXXXXX
1240          */
1241
1242         fn = basename(p);
1243         if (!filename_is_valid(fn))
1244                 return -EINVAL;
1245
1246         extra = strempty(extra);
1247
1248         t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1);
1249         if (!t)
1250                 return -ENOMEM;
1251
1252         strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX");
1253
1254         *ret = path_simplify(t, false);
1255         return 0;
1256 }
1257
1258 int tempfn_random(const char *p, const char *extra, char **ret) {
1259         const char *fn;
1260         char *t, *x;
1261         uint64_t u;
1262         unsigned i;
1263
1264         assert(p);
1265         assert(ret);
1266
1267         /*
1268          * Turns this:
1269          *         /foo/bar/waldo
1270          *
1271          * Into this:
1272          *         /foo/bar/.#<extra>waldobaa2a261115984a9
1273          */
1274
1275         fn = basename(p);
1276         if (!filename_is_valid(fn))
1277                 return -EINVAL;
1278
1279         extra = strempty(extra);
1280
1281         t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1);
1282         if (!t)
1283                 return -ENOMEM;
1284
1285         x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn);
1286
1287         u = random_u64();
1288         for (i = 0; i < 16; i++) {
1289                 *(x++) = hexchar(u & 0xF);
1290                 u >>= 4;
1291         }
1292
1293         *x = 0;
1294
1295         *ret = path_simplify(t, false);
1296         return 0;
1297 }
1298
1299 int tempfn_random_child(const char *p, const char *extra, char **ret) {
1300         char *t, *x;
1301         uint64_t u;
1302         unsigned i;
1303         int r;
1304
1305         assert(ret);
1306
1307         /* Turns this:
1308          *         /foo/bar/waldo
1309          * Into this:
1310          *         /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
1311          */
1312
1313         if (!p) {
1314                 r = tmp_dir(&p);
1315                 if (r < 0)
1316                         return r;
1317         }
1318
1319         extra = strempty(extra);
1320
1321         t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1);
1322         if (!t)
1323                 return -ENOMEM;
1324
1325         x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra);
1326
1327         u = random_u64();
1328         for (i = 0; i < 16; i++) {
1329                 *(x++) = hexchar(u & 0xF);
1330                 u >>= 4;
1331         }
1332
1333         *x = 0;
1334
1335         *ret = path_simplify(t, false);
1336         return 0;
1337 }
1338
1339 int write_timestamp_file_atomic(const char *fn, usec_t n) {
1340         char ln[DECIMAL_STR_MAX(n)+2];
1341
1342         /* Creates a "timestamp" file, that contains nothing but a
1343          * usec_t timestamp, formatted in ASCII. */
1344
1345         if (n <= 0 || n >= USEC_INFINITY)
1346                 return -ERANGE;
1347
1348         xsprintf(ln, USEC_FMT "\n", n);
1349
1350         return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
1351 }
1352
1353 int read_timestamp_file(const char *fn, usec_t *ret) {
1354         _cleanup_free_ char *ln = NULL;
1355         uint64_t t;
1356         int r;
1357
1358         r = read_one_line_file(fn, &ln);
1359         if (r < 0)
1360                 return r;
1361
1362         r = safe_atou64(ln, &t);
1363         if (r < 0)
1364                 return r;
1365
1366         if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
1367                 return -ERANGE;
1368
1369         *ret = (usec_t) t;
1370         return 0;
1371 }
1372
1373 int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) {
1374         int r;
1375
1376         assert(s);
1377
1378         /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
1379          * when specified shall initially point to a boolean variable initialized to false. It is set to true after the
1380          * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
1381          * element, but not before the first one. */
1382
1383         if (!f)
1384                 f = stdout;
1385
1386         if (space) {
1387                 if (!separator)
1388                         separator = " ";
1389
1390                 if (*space) {
1391                         r = fputs(separator, f);
1392                         if (r < 0)
1393                                 return r;
1394                 }
1395
1396                 *space = true;
1397         }
1398
1399         return fputs(s, f);
1400 }
1401
1402 int open_tmpfile_unlinkable(const char *directory, int flags) {
1403         char *p;
1404         int fd, r;
1405
1406         if (!directory) {
1407                 r = tmp_dir(&directory);
1408                 if (r < 0)
1409                         return r;
1410         }
1411
1412         /* Returns an unlinked temporary file that cannot be linked into the file system anymore */
1413
1414         /* Try O_TMPFILE first, if it is supported */
1415         fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
1416         if (fd >= 0)
1417                 return fd;
1418
1419         /* Fall back to unguessable name + unlinking */
1420         p = strjoina(directory, "/systemd-tmp-XXXXXX");
1421
1422         fd = mkostemp_safe(p);
1423         if (fd < 0)
1424                 return fd;
1425
1426         (void) unlink(p);
1427
1428         return fd;
1429 }
1430
1431 int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
1432         _cleanup_free_ char *tmp = NULL;
1433         int r, fd;
1434
1435         assert(target);
1436         assert(ret_path);
1437
1438         /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
1439         assert((flags & O_EXCL) == 0);
1440
1441         /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
1442          * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
1443          * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
1444
1445         {
1446                 _cleanup_free_ char *dn = NULL;
1447
1448                 dn = dirname_malloc(target);
1449                 if (!dn)
1450                         return -ENOMEM;
1451
1452                 fd = open(dn, O_TMPFILE|flags, 0640);
1453                 if (fd >= 0) {
1454                         *ret_path = NULL;
1455                         return fd;
1456                 }
1457
1458                 log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn);
1459         }
1460
1461         r = tempfn_random(target, NULL, &tmp);
1462         if (r < 0)
1463                 return r;
1464
1465         fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640);
1466         if (fd < 0)
1467                 return -errno;
1468
1469         *ret_path = TAKE_PTR(tmp);
1470
1471         return fd;
1472 }
1473
1474 int open_serialization_fd(const char *ident) {
1475         int fd = -1;
1476
1477         fd = memfd_create(ident, MFD_CLOEXEC);
1478         if (fd < 0) {
1479                 const char *path;
1480
1481                 path = getpid_cached() == 1 ? "/run/systemd" : "/tmp";
1482                 fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC);
1483                 if (fd < 0)
1484                         return fd;
1485
1486                 log_debug("Serializing %s to %s.", ident, path);
1487         } else
1488                 log_debug("Serializing %s to memfd.", ident);
1489
1490         return fd;
1491 }
1492
1493 int link_tmpfile(int fd, const char *path, const char *target) {
1494
1495         assert(fd >= 0);
1496         assert(target);
1497
1498         /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
1499          * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
1500          * on the directory, and renameat2() is used instead.
1501          *
1502          * Note that in both cases we will not replace existing files. This is because linkat() does not support this
1503          * operation currently (renameat2() does), and there is no nice way to emulate this. */
1504
1505         if (path) {
1506                 if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0)
1507                         return -errno;
1508         } else {
1509                 char proc_fd_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1];
1510
1511                 xsprintf(proc_fd_path, "/proc/self/fd/%i", fd);
1512
1513                 if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0)
1514                         return -errno;
1515         }
1516
1517         return 0;
1518 }
1519
1520 int read_nul_string(FILE *f, char **ret) {
1521         _cleanup_free_ char *x = NULL;
1522         size_t allocated = 0, n = 0;
1523
1524         assert(f);
1525         assert(ret);
1526
1527         /* Reads a NUL-terminated string from the specified file. */
1528
1529         for (;;) {
1530                 int c;
1531
1532                 if (!GREEDY_REALLOC(x, allocated, n+2))
1533                         return -ENOMEM;
1534
1535                 c = fgetc(f);
1536                 if (c == 0) /* Terminate at NUL byte */
1537                         break;
1538                 if (c == EOF) {
1539                         if (ferror(f))
1540                                 return -errno;
1541                         break; /* Terminate at EOF */
1542                 }
1543
1544                 x[n++] = (char) c;
1545         }
1546
1547         if (x)
1548                 x[n] = 0;
1549         else {
1550                 x = new0(char, 1);
1551                 if (!x)
1552                         return -ENOMEM;
1553         }
1554
1555         *ret = TAKE_PTR(x);
1556
1557         return 0;
1558 }
1559
1560 int mkdtemp_malloc(const char *template, char **ret) {
1561         char *p;
1562
1563         assert(template);
1564         assert(ret);
1565
1566         p = strdup(template);
1567         if (!p)
1568                 return -ENOMEM;
1569
1570         if (!mkdtemp(p)) {
1571                 free(p);
1572                 return -errno;
1573         }
1574
1575         *ret = p;
1576         return 0;
1577 }
1578
1579 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
1580
1581 int read_line(FILE *f, size_t limit, char **ret) {
1582         _cleanup_free_ char *buffer = NULL;
1583         size_t n = 0, allocated = 0, count = 0;
1584
1585         assert(f);
1586
1587         /* Something like a bounded version of getline().
1588          *
1589          * Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string
1590          * returned.
1591          *
1592          * Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from
1593          * the number of characters in the returned string). When EOF is hit, 0 is returned.
1594          *
1595          * The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding
1596          * delimiters. If the limit is hit we fail and return -ENOBUFS.
1597          *
1598          * If a line shall be skipped ret may be initialized as NULL. */
1599
1600         if (ret) {
1601                 if (!GREEDY_REALLOC(buffer, allocated, 1))
1602                         return -ENOMEM;
1603         }
1604
1605         {
1606                 _unused_ _cleanup_(funlockfilep) FILE *flocked = f;
1607                 flockfile(f);
1608
1609                 for (;;) {
1610                         int c;
1611
1612                         if (n >= limit)
1613                                 return -ENOBUFS;
1614
1615                         errno = 0;
1616                         c = fgetc_unlocked(f);
1617                         if (c == EOF) {
1618                                 /* if we read an error, and have no data to return, then propagate the error */
1619                                 if (ferror_unlocked(f) && n == 0)
1620                                         return errno > 0 ? -errno : -EIO;
1621
1622                                 break;
1623                         }
1624
1625                         count++;
1626
1627                         if (IN_SET(c, '\n', 0)) /* Reached a delimiter */
1628                                 break;
1629
1630                         if (ret) {
1631                                 if (!GREEDY_REALLOC(buffer, allocated, n + 2))
1632                                         return -ENOMEM;
1633
1634                                 buffer[n] = (char) c;
1635                         }
1636
1637                         n++;
1638                 }
1639         }
1640
1641         if (ret) {
1642                 buffer[n] = 0;
1643
1644                 *ret = TAKE_PTR(buffer);
1645         }
1646
1647         return (int) count;
1648 }