139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/* Test of POSIX compatible fflush() function.
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Copyright (C) 2007 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Eric Blake, 2007. */
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#include <config.h>
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#include <stdio.h>
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#include <unistd.h>
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int
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main (int argc, char *argv[])
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{
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FILE *f;
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char buffer[10];
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int fd;
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/* Create test file. */
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f = fopen ("test-fflush.txt", "w");
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if (!f || fwrite ("1234567890ABCDEFG", 1, 17, f) != 17 || fclose (f) != 0)
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{
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fputs ("Failed to create sample file.\n", stderr);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* Test fflush. */
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f = fopen ("test-fflush.txt", "r");
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fd = fileno (f);
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if (!f || 0 > fd || fread (buffer, 1, 5, f) != 5)
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{
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fputs ("Failed initial read of sample file.\n", stderr);
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* For deterministic results, ensure f read a bigger buffer.
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This is not the case on BeOS, nor on uClibc. */
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#if !(defined __BEOS__ || defined __UCLIBC__)
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if (lseek (fd, 0, SEEK_CUR) == 5)
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{
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fputs ("Sample file was not buffered after fread.\n", stderr);
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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#endif
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/* POSIX requires fflush-fseek to set file offset of fd. */
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if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
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{
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fputs ("Failed to flush-fseek sample file.\n", stderr);
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* Check that offset is correct. */
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if (lseek (fd, 0, SEEK_CUR) != 5)
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{
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fprintf (stderr, "File offset is wrong after fseek: %ld.\n",
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(long) lseek (fd, 0, SEEK_CUR));
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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if (ftell (f) != 5)
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{
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fprintf (stderr, "ftell result is wrong after fseek: %ld.\n",
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(long) ftell (f));
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* Check that file reading resumes at correct location. */
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if (fgetc (f) != '6')
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{
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fputs ("Failed to read next byte after fseek.\n", stderr);
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* For deterministic results, ensure f read a bigger buffer. */
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if (lseek (fd, 0, SEEK_CUR) == 6)
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{
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fputs ("Sample file was not buffered after fgetc.\n", stderr);
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* POSIX requires fflush-fseeko to set file offset of fd. */
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if (fflush (f) != 0 || fseeko (f, 0, SEEK_CUR) != 0)
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{
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fputs ("Failed to flush-fseeko sample file.\n", stderr);
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* Check that offset is correct. */
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if (lseek (fd, 0, SEEK_CUR) != 6)
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{
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fprintf (stderr, "File offset is wrong after fseeko: %ld.\n",
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(long) lseek (fd, 0, SEEK_CUR));
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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if (ftell (f) != 6)
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{
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fprintf (stderr, "ftell result is wrong after fseeko: %ld.\n",
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(long) ftell (f));
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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/* Check that file reading resumes at correct location. */
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if (fgetc (f) != '7')
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{
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fputs ("Failed to read next byte after fseeko.\n", stderr);
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fclose (f);
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unlink ("test-fflush.txt");
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return 1;
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}
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fclose (f);
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unlink ("test-fflush.txt");
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return 0;
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}
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