tests/truncate.c

   1 /*
   2  * Copyright (c) 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <stdio.h>
  39 #include <unistd.h>
  40 #include <fcntl.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #include <err.h>
  45 #include <roken.h>
  46
  47 RCSID("$Id$");
  48
  49 static void
  50 create_and_write (char *name, const char *buf)
  51 {
  52     int fd, ret;
  53     int len = strlen(buf);
  54
  55     fd = open (name, O_WRONLY|O_CREAT|O_TRUNC, 0666);
  56     if (fd < 0)
  57         err (1, "open");
  58     ret = write (fd, buf, len);
  59     if (ret != len)
  60         err (1, "write");
  61     ret = close (fd);
  62     if (ret < 0)
  63         err (1, "close");
  64 }
  65
  66 static void
  67 check_size (char *name, int len)
  68 {
  69     struct stat sb;
  70     int ret;
  71
  72     ret = stat(name, &sb);
  73     if (ret < 0)
  74         err (1, "stat");
  75
  76     if (len != sb.st_size)
  77         errx (1, "len != sb.st_size");
  78 }
  79
  80 int
  81 main(int argc, char **argv)
  82 {
  83     int ret;
  84
  85     setprogname (argv[0]);
  86
  87     create_and_write ("foo", "hej\n");
  88
  89     ret = truncate ("foo", 0);
  90     if (ret < 0)
  91         err (1, "truncate(0)");
  92
  93     check_size ("foo", 0);
  94
  95     ret = unlink("foo");
  96     if (ret < 0)
  97         errx (1, "unlink");
  98
  99     create_and_write ("bar", "hej\nhej\n");
 100
 101     ret = truncate ("bar", 16);
 102     if (ret < 0)
 103         err (1, "truncate(16)");
 104
 105     check_size ("bar", 16);
 106
 107     ret = unlink("bar");
 108     if (ret < 0)
 109         errx (1, "unlink");
 110
 111     return 0;
 112 }