stdio-common/tst-fseek.c

   1 /* Tests of fseek and fseeko.
   2    Copyright (C) 2000-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <error.h>
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <time.h>
  26 #include <sys/stat.h>
  27
  28 #include <support/support.h>
  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   fname = xasprintf ("%s/tst-fseek.XXXXXX", tmpdir);
  49
  50   /* Create a temporary file.   */
  51   fd = mkstemp (fname);
  52   if (fd == -1)
  53     error (EXIT_FAILURE, errno, "cannot open temporary file");
  54
  55   fp = fdopen (fd, "w+");
  56   if (fp == NULL)
  57     error (EXIT_FAILURE, errno, "cannot get FILE for temporary file");
  58
  59   setbuffer (fp, strbuf, sizeof (outstr) -1);
  60
  61   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
  62     {
  63       printf ("%d: write error\n", __LINE__);
  64       result = 1;
  65       goto out;
  66     }
  67
  68   /* The EOF flag must be reset.  */
  69   if (fgetc (fp) != EOF)
  70     {
  71       printf ("%d: managed to read at end of file\n", __LINE__);
  72       result = 1;
  73     }
  74   else if (! feof (fp))
  75     {
  76       printf ("%d: EOF flag not set\n", __LINE__);
  77       result = 1;
  78     }
  79   if (fseek (fp, 0, SEEK_CUR) != 0)
  80     {
  81       printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
  82       result = 1;
  83     }
  84   else if (feof (fp))
  85     {
  86       printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
  87       result = 1;
  88     }
  89
  90   /* Do the same for fseeko().  */
  91     if (fgetc (fp) != EOF)
  92     {
  93       printf ("%d: managed to read at end of file\n", __LINE__);
  94       result = 1;
  95     }
  96   else if (! feof (fp))
  97     {
  98       printf ("%d: EOF flag not set\n", __LINE__);
  99       result = 1;
 100     }
 101   if (fseeko (fp, 0, SEEK_CUR) != 0)
 102     {
 103       printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
 104       result = 1;
 105     }
 106   else if (feof (fp))
 107     {
 108       printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
 109       result = 1;
 110     }
 111
 112   /* Go back to the beginning of the file: absolute.  */
 113   if (fseek (fp, 0, SEEK_SET) != 0)
 114     {
 115       printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
 116       result = 1;
 117     }
 118   else if (fflush (fp) != 0)
 119     {
 120       printf ("%d: fflush() failed\n", __LINE__);
 121       result = 1;
 122     }
 123   else if (lseek (fd, 0, SEEK_CUR) != 0)
 124     {
 125       printf ("%d: lseek() returned different position\n", __LINE__);
 126       result = 1;
 127     }
 128   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 129     {
 130       printf ("%d: fread() failed\n", __LINE__);
 131       result = 1;
 132     }
 133   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 134     {
 135       printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
 136       result = 1;
 137     }
 138
 139   /* Now with fseeko.  */
 140   if (fseeko (fp, 0, SEEK_SET) != 0)
 141     {
 142       printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
 143       result = 1;
 144     }
 145   else if (fflush (fp) != 0)
 146     {
 147       printf ("%d: fflush() failed\n", __LINE__);
 148       result = 1;
 149     }
 150   else if (lseek (fd, 0, SEEK_CUR) != 0)
 151     {
 152       printf ("%d: lseek() returned different position\n", __LINE__);
 153       result = 1;
 154     }
 155   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 156     {
 157       printf ("%d: fread() failed\n", __LINE__);
 158       result = 1;
 159     }
 160   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 161     {
 162       printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
 163       result = 1;
 164     }
 165
 166   /* Go back to the beginning of the file: relative.  */
 167   if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
 168     {
 169       printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
 170       result = 1;
 171     }
 172   else if (fflush (fp) != 0)
 173     {
 174       printf ("%d: fflush() failed\n", __LINE__);
 175       result = 1;
 176     }
 177   else if (lseek (fd, 0, SEEK_CUR) != 0)
 178     {
 179       printf ("%d: lseek() returned different position\n", __LINE__);
 180       result = 1;
 181     }
 182   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 183     {
 184       printf ("%d: fread() failed\n", __LINE__);
 185       result = 1;
 186     }
 187   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 188     {
 189       printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
 190       result = 1;
 191     }
 192
 193   /* Now with fseeko.  */
 194   if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
 195     {
 196       printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
 197       result = 1;
 198     }
 199   else if (fflush (fp) != 0)
 200     {
 201       printf ("%d: fflush() failed\n", __LINE__);
 202       result = 1;
 203     }
 204   else if (lseek (fd, 0, SEEK_CUR) != 0)
 205     {
 206       printf ("%d: lseek() returned different position\n", __LINE__);
 207       result = 1;
 208     }
 209   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 210     {
 211       printf ("%d: fread() failed\n", __LINE__);
 212       result = 1;
 213     }
 214   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 215     {
 216       printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
 217       result = 1;
 218     }
 219
 220   /* Go back to the beginning of the file: from the end.  */
 221   if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
 222     {
 223       printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
 224       result = 1;
 225     }
 226   else if (fflush (fp) != 0)
 227     {
 228       printf ("%d: fflush() failed\n", __LINE__);
 229       result = 1;
 230     }
 231   else if (lseek (fd, 0, SEEK_CUR) != 0)
 232     {
 233       printf ("%d: lseek() returned different position\n", __LINE__);
 234       result = 1;
 235     }
 236   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 237     {
 238       printf ("%d: fread() failed\n", __LINE__);
 239       result = 1;
 240     }
 241   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 242     {
 243       printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
 244       result = 1;
 245     }
 246
 247   /* Now with fseeko.  */
 248   if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
 249     {
 250       printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
 251       result = 1;
 252     }
 253   else if (fflush (fp) != 0)
 254     {
 255       printf ("%d: fflush() failed\n", __LINE__);
 256       result = 1;
 257     }
 258   else if (lseek (fd, 0, SEEK_CUR) != 0)
 259     {
 260       printf ("%d: lseek() returned different position\n", __LINE__);
 261       result = 1;
 262     }
 263   else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
 264     {
 265       printf ("%d: fread() failed\n", __LINE__);
 266       result = 1;
 267     }
 268   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
 269     {
 270       printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
 271       result = 1;
 272     }
 273
 274   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 275     {
 276       printf ("%d: write error 2\n", __LINE__);
 277       result = 1;
 278       goto out;
 279     }
 280
 281   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 282     {
 283       printf ("%d: write error 3\n", __LINE__);
 284       result = 1;
 285       goto out;
 286     }
 287
 288   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 289     {
 290       printf ("%d: write error 4\n", __LINE__);
 291       result = 1;
 292       goto out;
 293     }
 294
 295   if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
 296     {
 297       printf ("%d: write error 5\n", __LINE__);
 298       result = 1;
 299       goto out;
 300     }
 301
 302   if (fputc ('1', fp) == EOF || fputc ('2', fp) == EOF)
 303     {
 304       printf ("%d: cannot add characters at the end\n", __LINE__);
 305       result = 1;
 306       goto out;
 307     }
 308
 309   /* Check the access time.  */
 310   if (fstat64 (fd, &st1) < 0)
 311     {
 312       printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
 313       result = 1;
 314     }
 315   else
 316     {
 317       sleep (1);
 318
 319       if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_CUR) != 0)
 320         {
 321           printf ("%d: fseek() after write characters failed\n", __LINE__);
 322           result = 1;
 323           goto out;
 324         }
 325       else
 326         {
 327
 328           time_t t;
 329           /* Make sure the timestamp actually can be different.  */
 330           sleep (1);
 331           t = time (NULL);
 332
 333           if (fstat64 (fd, &st2) < 0)
 334             {
 335               printf ("%d: fstat64() after fseeko() failed\n\n", __LINE__);
 336               result = 1;
 337             }
 338           if (st1.st_ctime >= t)
 339             {
 340               printf ("%d: st_ctime not updated\n", __LINE__);
 341               result = 1;
 342             }
 343           if (st1.st_mtime >= t)
 344             {
 345               printf ("%d: st_mtime not updated\n", __LINE__);
 346               result = 1;
 347             }
 348           if (st1.st_ctime >= st2.st_ctime)
 349             {
 350               printf ("%d: st_ctime not changed\n", __LINE__);
 351               result = 1;
 352             }
 353           if (st1.st_mtime >= st2.st_mtime)
 354             {
 355               printf ("%d: st_mtime not changed\n", __LINE__);
 356               result = 1;
 357             }
 358         }
 359     }
 360
 361   if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
 362       != 2 + 2 * (sizeof (outstr) - 1))
 363     {
 364       printf ("%d: reading 2 records plus bits failed\n", __LINE__);
 365       result = 1;
 366     }
 367   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
 368            || memcmp (&buf[sizeof (outstr) - 1], outstr,
 369                       sizeof (outstr) - 1) != 0
 370            || buf[2 * (sizeof (outstr) - 1)] != '1'
 371            || buf[2 * (sizeof (outstr) - 1) + 1] != '2')
 372     {
 373       printf ("%d: reading records failed\n", __LINE__);
 374       result = 1;
 375     }
 376   else if (ungetc ('9', fp) == EOF)
 377     {
 378       printf ("%d: ungetc() failed\n", __LINE__);
 379       result = 1;
 380     }
 381   else if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_END) != 0)
 382     {
 383       printf ("%d: fseek after ungetc failed\n", __LINE__);
 384       result = 1;
 385     }
 386   else if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
 387       != 2 + 2 * (sizeof (outstr) - 1))
 388     {
 389       printf ("%d: reading 2 records plus bits failed\n", __LINE__);
 390       result = 1;
 391     }
 392   else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
 393            || memcmp (&buf[sizeof (outstr) - 1], outstr,
 394                       sizeof (outstr) - 1) != 0
 395            || buf[2 * (sizeof (outstr) - 1)] != '1')
 396     {
 397       printf ("%d: reading records for the second time failed\n", __LINE__);
 398       result = 1;
 399     }
 400   else if (buf[2 * (sizeof (outstr) - 1) + 1] == '9')
 401     {
 402       printf ("%d: unget character not ignored\n", __LINE__);
 403       result = 1;
 404     }
 405   else if (buf[2 * (sizeof (outstr) - 1) + 1] != '2')
 406     {
 407       printf ("%d: unget somehow changed character\n", __LINE__);
 408       result = 1;
 409     }
 410
 411   fclose (fp);
 412
 413   fp = fopen (fname, "r");
 414   if (fp == NULL)
 415     {
 416       printf ("%d: fopen() failed\n\n", __LINE__);
 417       result = 1;
 418     }
 419   else if (fstat64 (fileno (fp), &st1) < 0)
 420     {
 421       printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
 422       result = 1;
 423     }
 424   else if (fseeko (fp, 0, SEEK_END) != 0)
 425     {
 426       printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
 427       result = 1;
 428     }
 429   else if (ftello (fp) != st1.st_size)
 430     {
 431       printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
 432               (size_t) st1.st_size, (size_t) ftello (fp));
 433       result = 1;
 434     }
 435   else
 436     printf ("%d: SEEK_END works\n", __LINE__);
 437   if (fp != NULL)
 438     fclose (fp);
 439
 440   fp = fopen (fname, "r");
 441   if (fp == NULL)
 442     {
 443       printf ("%d: fopen() failed\n\n", __LINE__);
 444       result = 1;
 445     }
 446   else if (fstat64 (fileno (fp), &st1) < 0)
 447     {
 448       printf ("%d: fstat64() before fgetc() failed\n\n", __LINE__);
 449       result = 1;
 450     }
 451   else if (fgetc (fp) == EOF)
 452     {
 453       printf ("%d: fgetc() before fseeko() failed\n\n", __LINE__);
 454       result = 1;
 455     }
 456   else if (fseeko (fp, 0, SEEK_END) != 0)
 457     {
 458       printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
 459       result = 1;
 460     }
 461   else if (ftello (fp) != st1.st_size)
 462     {
 463       printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
 464               (size_t) st1.st_size, (size_t) ftello (fp));
 465       result = 1;
 466     }
 467   else
 468     printf ("%d: SEEK_END works\n", __LINE__);
 469   if (fp != NULL)
 470     fclose (fp);
 471
 472  out:
 473   unlink (fname);
 474
 475   return result;
 476 }
 477
 478 #define TEST_FUNCTION do_test ()
 479 #include "../test-skeleton.c"