stdio-common/tst-fseek.c

   1 /* Tests of fseek and fseeko.
   2    Copyright (C) 2000-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <error.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <time.h>
  27 #include <sys/stat.h>
  28
  29
  30 static int
  31 do_test (void)
  32 {
  33   const char *tmpdir;
  34   char *fname;
  35   int fd;
  36   FILE *fp;
  37   const char outstr[] = "hello world!\n";
  38   char strbuf[sizeof outstr];
  39   char buf[200];
  40   struct stat64 st1;
  41   struct stat64 st2;
  42   int result = 0;
  43
  44   tmpdir = getenv ("TMPDIR");
  45   if (tmpdir == NULL || tmpdir[0] == '\0')
  46     tmpdir = "/tmp";
  47
  48   asprintf (&fname, "%s/tst-fseek.XXXXXX", tmpdir);
  49   if (fname == NULL)
  50     error (EXIT_FAILURE, errno, "cannot generate name for temporary file");
  51
  52   /* Create a temporary file.   */
  53   fd = mkstemp (fname);
  54   if (fd == -1)
  55     error (EXIT_FAILURE, errno, "cannot open temporary file");
  56
  57   fp = fdopen (fd, "w+");
  58   if (fp == NULL)
  59     error (EXIT_FAILURE, errno, "cannot get FILE for temporary file");
  60
  61   setbuffer (fp, strbuf, sizeof (outstr) -1);
  62
  63   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
  64     {
  65       printf ("%d: write error\n", __LINE__);
  66       result = 1;
  67       goto out;
  68     }
  69
  70   /* The EOF flag must be reset.  */
  71   if (fgetc (fp) != EOF)
  72     {
  73       printf ("%d: managed to read at end of file\n", __LINE__);
  74       result = 1;
  75     }
  76   else if (! feof (fp))
  77     {
  78       printf ("%d: EOF flag not set\n", __LINE__);
  79       result = 1;
  80     }
  81   if (fseek (fp, 0, SEEK_CUR) != 0)
  82     {
  83       printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
  84       result = 1;
  85     }
  86   else if (feof (fp))
  87     {
  88       printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
  89       result = 1;
  90     }
  91
  92   /* Do the same for fseeko().  */
  93     if (fgetc (fp) != EOF)
  94     {
  95       printf ("%d: managed to read at end of file\n", __LINE__);
  96       result = 1;
  97     }
  98   else if (! feof (fp))
  99     {
 100       printf ("%d: EOF flag not set\n", __LINE__);
 101       result = 1;
 102     }
 103   if (fseeko (fp, 0, SEEK_CUR) != 0)
 104     {
 105       printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
 106       result = 1;
 107     }
 108   else if (feof (fp))
 109     {
 110       printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
 111       result = 1;
 112     }
 113
 114   /* Go back to the beginning of the file: absolute.  */
 115   if (fseek (fp, 0, SEEK_SET) != 0)
 116     {
 117       printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
 118       result = 1;
 119     }
 120   else if (fflush (fp) != 0)
 121     {
 122       printf ("%d: fflush() failed\n", __LINE__);
 123       result = 1;
 124     }
 125   else if (lseek (fd, 0, SEEK_CUR) != 0)
 126     {
 127       printf ("%d: lseek() returned different position\n", __LINE__);
 128       result = 1;
 129     }
 130   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 131     {
 132       printf ("%d: fread() failed\n", __LINE__);
 133       result = 1;
 134     }
 135   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 136     {
 137       printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
 138       result = 1;
 139     }
 140
 141   /* Now with fseeko.  */
 142   if (fseeko (fp, 0, SEEK_SET) != 0)
 143     {
 144       printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
 145       result = 1;
 146     }
 147   else if (fflush (fp) != 0)
 148     {
 149       printf ("%d: fflush() failed\n", __LINE__);
 150       result = 1;
 151     }
 152   else if (lseek (fd, 0, SEEK_CUR) != 0)
 153     {
 154       printf ("%d: lseek() returned different position\n", __LINE__);
 155       result = 1;
 156     }
 157   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 158     {
 159       printf ("%d: fread() failed\n", __LINE__);
 160       result = 1;
 161     }
 162   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 163     {
 164       printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
 165       result = 1;
 166     }
 167
 168   /* Go back to the beginning of the file: relative.  */
 169   if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
 170     {
 171       printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
 172       result = 1;
 173     }
 174   else if (fflush (fp) != 0)
 175     {
 176       printf ("%d: fflush() failed\n", __LINE__);
 177       result = 1;
 178     }
 179   else if (lseek (fd, 0, SEEK_CUR) != 0)
 180     {
 181       printf ("%d: lseek() returned different position\n", __LINE__);
 182       result = 1;
 183     }
 184   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 185     {
 186       printf ("%d: fread() failed\n", __LINE__);
 187       result = 1;
 188     }
 189   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 190     {
 191       printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
 192       result = 1;
 193     }
 194
 195   /* Now with fseeko.  */
 196   if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
 197     {
 198       printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
 199       result = 1;
 200     }
 201   else if (fflush (fp) != 0)
 202     {
 203       printf ("%d: fflush() failed\n", __LINE__);
 204       result = 1;
 205     }
 206   else if (lseek (fd, 0, SEEK_CUR) != 0)
 207     {
 208       printf ("%d: lseek() returned different position\n", __LINE__);
 209       result = 1;
 210     }
 211   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 212     {
 213       printf ("%d: fread() failed\n", __LINE__);
 214       result = 1;
 215     }
 216   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 217     {
 218       printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
 219       result = 1;
 220     }
 221
 222   /* Go back to the beginning of the file: from the end.  */
 223   if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
 224     {
 225       printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
 226       result = 1;
 227     }
 228   else if (fflush (fp) != 0)
 229     {
 230       printf ("%d: fflush() failed\n", __LINE__);
 231       result = 1;
 232     }
 233   else if (lseek (fd, 0, SEEK_CUR) != 0)
 234     {
 235       printf ("%d: lseek() returned different position\n", __LINE__);
 236       result = 1;
 237     }
 238   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 239     {
 240       printf ("%d: fread() failed\n", __LINE__);
 241       result = 1;
 242     }
 243   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 244     {
 245       printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
 246       result = 1;
 247     }
 248
 249   /* Now with fseeko.  */
 250   if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
 251     {
 252       printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
 253       result = 1;
 254     }
 255   else if (fflush (fp) != 0)
 256     {
 257       printf ("%d: fflush() failed\n", __LINE__);
 258       result = 1;
 259     }
 260   else if (lseek (fd, 0, SEEK_CUR) != 0)
 261     {
 262       printf ("%d: lseek() returned different position\n", __LINE__);
 263       result = 1;
 264     }
 265   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 266     {
 267       printf ("%d: fread() failed\n", __LINE__);
 268       result = 1;
 269     }
 270   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 271     {
 272       printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
 273       result = 1;
 274     }
 275
 276   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 277     {
 278       printf ("%d: write error 2\n", __LINE__);
 279       result = 1;
 280       goto out;
 281     }
 282
 283   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 284     {
 285       printf ("%d: write error 3\n", __LINE__);
 286       result = 1;
 287       goto out;
 288     }
 289
 290   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 291     {
 292       printf ("%d: write error 4\n", __LINE__);
 293       result = 1;
 294       goto out;
 295     }
 296
 297   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 298     {
 299       printf ("%d: write error 5\n", __LINE__);
 300       result = 1;
 301       goto out;
 302     }
 303
 304   if (fputc ('1', fp) == EOF || fputc ('2', fp) == EOF)
 305     {
 306       printf ("%d: cannot add characters at the end\n", __LINE__);
 307       result = 1;
 308       goto out;
 309     }
 310
 311   /* Check the access time.  */
 312   if (fstat64 (fd, &st1) < 0)
 313     {
 314       printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
 315       result = 1;
 316     }
 317   else
 318     {
 319       sleep (1);
 320
 321       if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_CUR) != 0)
 322         {
 323           printf ("%d: fseek() after write characters failed\n", __LINE__);
 324           result = 1;
 325           goto out;
 326         }
 327       else
 328         {
 329
 330           time_t t;
 331           /* Make sure the timestamp actually can be different.  */
 332           sleep (1);
 333           t = time (NULL);
 334
 335           if (fstat64 (fd, &st2) < 0)
 336             {
 337               printf ("%d: fstat64() after fseeko() failed\n\n", __LINE__);
 338               result = 1;
 339             }
 340           if (st1.st_ctime >= t)
 341             {
 342               printf ("%d: st_ctime not updated\n", __LINE__);
 343               result = 1;
 344             }
 345           if (st1.st_mtime >= t)
 346             {
 347               printf ("%d: st_mtime not updated\n", __LINE__);
 348               result = 1;
 349             }
 350           if (st1.st_ctime >= st2.st_ctime)
 351             {
 352               printf ("%d: st_ctime not changed\n", __LINE__);
 353               result = 1;
 354             }
 355           if (st1.st_mtime >= st2.st_mtime)
 356             {
 357               printf ("%d: st_mtime not changed\n", __LINE__);
 358               result = 1;
 359             }
 360         }
 361     }
 362
 363   if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
 364       != 2 + 2 * (sizeof (outstr) - 1))
 365     {
 366       printf ("%d: reading 2 records plus bits failed\n", __LINE__);
 367       result = 1;
 368     }
 369   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
 370            || memcmp (&buf[sizeof (outstr) - 1], outstr,
 371                       sizeof (outstr) - 1) != 0
 372            || buf[2 * (sizeof (outstr) - 1)] != '1'
 373            || buf[2 * (sizeof (outstr) - 1) + 1] != '2')
 374     {
 375       printf ("%d: reading records failed\n", __LINE__);
 376       result = 1;
 377     }
 378   else if (ungetc ('9', fp) == EOF)
 379     {
 380       printf ("%d: ungetc() failed\n", __LINE__);
 381       result = 1;
 382     }
 383   else if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_END) != 0)
 384     {
 385       printf ("%d: fseek after ungetc failed\n", __LINE__);
 386       result = 1;
 387     }
 388   else if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
 389       != 2 + 2 * (sizeof (outstr) - 1))
 390     {
 391       printf ("%d: reading 2 records plus bits failed\n", __LINE__);
 392       result = 1;
 393     }
 394   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
 395            || memcmp (&buf[sizeof (outstr) - 1], outstr,
 396                       sizeof (outstr) - 1) != 0
 397            || buf[2 * (sizeof (outstr) - 1)] != '1')
 398     {
 399       printf ("%d: reading records for the second time failed\n", __LINE__);
 400       result = 1;
 401     }
 402   else if (buf[2 * (sizeof (outstr) - 1) + 1] == '9')
 403     {
 404       printf ("%d: unget character not ignored\n", __LINE__);
 405       result = 1;
 406     }
 407   else if (buf[2 * (sizeof (outstr) - 1) + 1] != '2')
 408     {
 409       printf ("%d: unget somehow changed character\n", __LINE__);
 410       result = 1;
 411     }
 412
 413   fclose (fp);
 414
 415   fp = fopen (fname, "r");
 416   if (fp == NULL)
 417     {
 418       printf ("%d: fopen() failed\n\n", __LINE__);
 419       result = 1;
 420     }
 421   else if (fstat64 (fileno (fp), &st1) < 0)
 422     {
 423       printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
 424       result = 1;
 425     }
 426   else if (fseeko (fp, 0, SEEK_END) != 0)
 427     {
 428       printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
 429       result = 1;
 430     }
 431   else if (ftello (fp) != st1.st_size)
 432     {
 433       printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
 434               (size_t) st1.st_size, (size_t) ftello (fp));
 435       result = 1;
 436     }
 437   else
 438     printf ("%d: SEEK_END works\n", __LINE__);
 439   if (fp != NULL)
 440     fclose (fp);
 441
 442   fp = fopen (fname, "r");
 443   if (fp == NULL)
 444     {
 445       printf ("%d: fopen() failed\n\n", __LINE__);
 446       result = 1;
 447     }
 448   else if (fstat64 (fileno (fp), &st1) < 0)
 449     {
 450       printf ("%d: fstat64() before fgetc() failed\n\n", __LINE__);
 451       result = 1;
 452     }
 453   else if (fgetc (fp) == EOF)
 454     {
 455       printf ("%d: fgetc() before fseeko() failed\n\n", __LINE__);
 456       result = 1;
 457     }
 458   else if (fseeko (fp, 0, SEEK_END) != 0)
 459     {
 460       printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
 461       result = 1;
 462     }
 463   else if (ftello (fp) != st1.st_size)
 464     {
 465       printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
 466               (size_t) st1.st_size, (size_t) ftello (fp));
 467       result = 1;
 468     }
 469   else
 470     printf ("%d: SEEK_END works\n", __LINE__);
 471   if (fp != NULL)
 472     fclose (fp);
 473
 474  out:
 475   unlink (fname);
 476
 477   return result;
 478 }
 479
 480 #define TEST_FUNCTION do_test ()
 481 #include "../test-skeleton.c"