src/tests/create-files.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997, 1998, 1999 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 <stdlib.h>
  40 #include <string.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <fcntl.h>
  44 #include <unistd.h>
  45 #include <dirent.h>
  46
  47 #include <err.h>
  48
  49 #undef max
  50 #define max(a,b) ((a) > (b) ? (a) : (b))
  51 #undef min
  52 #define min(a,b) ((a) < (b) ? (a) : (b))
  53
  54 static int
  55 creat_files(int count, long startsize)
  56 {
  57     int i;
  58     long size = 0;
  59
  60     for (i = 0; i < count; ++i) {
  61         char num[17];
  62         int fd;
  63
  64         snprintf(num, sizeof(num), "%d", i);
  65
  66         fd = open(num, O_WRONLY | O_CREAT | O_EXCL, 0777);
  67         if (fd < 0)
  68             err(1, "open %s", num);
  69         size = startsize;
  70         while (size > 0) {
  71             char buf[8192];
  72             size_t len;
  73             ssize_t ret;
  74
  75             len = min(sizeof(buf), size);
  76
  77             ret = write(fd, buf, len);
  78             if (ret < 0)
  79                 err(1, "write to %s", num);
  80             if (ret != len)
  81                 errx(1, "short write to %s", num);
  82             size -= ret;
  83         }
  84         if (close(fd) < 0)
  85             err(1, "close %s", num);
  86     }
  87     return 0;
  88 }
  89
  90 static void
  91 usage(int ret)
  92 {
  93     fprintf(stderr, "%s number-of-files size-of-files\n", __progname);
  94     exit(ret);
  95 }
  96
  97 int
  98 main(int argc, char **argv)
  99 {
 100     char *ptr;
 101     int count;
 102     long size;
 103
 104
 105     if (argc != 3)
 106         usage(1);
 107
 108     count = strtol(argv[1], &ptr, 0);
 109     if (count == 0 && ptr == argv[1])
 110         errx(1, "'%s' not a number", argv[1]);
 111
 112     size = strtol(argv[2], &ptr, 0);
 113     if (size == 0 && ptr == argv[2])
 114         errx(1, "`%s' not a number", argv[2]);
 115
 116     return creat_files(count, size);
 117 }