tests/truncate-files.c

   1 /*
   2  * Copyright (c) 1995 - 2001 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 #include <roken.h>
  49
  50 #ifdef RCSID
  51 RCSID("$Id$");
  52 #endif
  53
  54 static void do_dir(const char *);
  55 static void repeat_dir(const char *);
  56
  57 static void
  58 do_dir(const char *dirname)
  59 {
  60     int ret;
  61
  62     ret = chdir (dirname);
  63     if (ret < 0)
  64         err (1, "chdir %s", dirname);
  65     repeat_dir (dirname);
  66     ret = chdir ("..");
  67     if (ret < 0)
  68         err (1, "chdir ..");
  69 }
  70
  71 static void
  72 read_and_truncate (const char *filename, const struct stat *sb)
  73 {
  74     int fd;
  75     char *buf;
  76     int ret;
  77     struct stat sb2;
  78
  79     buf = malloc (sb->st_size);
  80     if (buf == NULL)
  81         err (1, "malloc %lu", (unsigned long)sb->st_size);
  82     fd = open (filename, O_RDONLY);
  83     if (fd < 0)
  84         err (1, "open readonly %s", filename);
  85     ret = read (fd, buf, sb->st_size);
  86     if (ret < 0)
  87         err (1, "read %s", filename);
  88     if (ret != sb->st_size)
  89         errx (1, "short read from %s", filename);
  90     if (close (fd))
  91         err (1, "close reading %s", filename);
  92     fd = open (filename, O_WRONLY | O_TRUNC, 0);
  93     if (fd < 0)
  94         err(1, "open wronly-trunc %s", filename);
  95     ret = write (fd, buf, sb->st_size);
  96     if (ret < 0)
  97         err (1, "write %s", filename);
  98     if (ret != sb->st_size)
  99         errx (1, "short write %s", filename);
 100     if (close (fd))
 101         err (1, "close writing %s", filename);
 102     ret = lstat (filename, &sb2);
 103     if (ret < 0)
 104         err (1, "stat %s", filename);
 105     if (sb2.st_size != sb->st_size)
 106         errx (1, "wrong size after re-writing %s: %lu != %lu",
 107               filename,
 108               (unsigned long)sb->st_size, (unsigned long)sb2.st_size);
 109     free(buf);
 110 }
 111
 112 static void
 113 repeat_dir (const char *dirname)
 114 {
 115     DIR *dir;
 116     struct dirent *dp;
 117
 118     dir = opendir (".");
 119     if (dir == NULL)
 120         err(1, "opendir %s", dirname);
 121     while ((dp = readdir (dir)) != NULL) {
 122         struct stat sb;
 123         int ret;
 124
 125         if (strcmp (dp->d_name, ".") == 0
 126             || strcmp (dp->d_name, "..") == 0)
 127             continue;
 128
 129         ret = lstat (dp->d_name, &sb);
 130         if (ret < 0)
 131             err (1, "lstat %s", dp->d_name);
 132         if (S_ISDIR(sb.st_mode))
 133             do_dir (dp->d_name);
 134         else if (S_ISREG(sb.st_mode))
 135             read_and_truncate (dp->d_name, &sb);
 136     }
 137     closedir (dir);
 138 }
 139
 140
 141 int
 142 main(int argc, char **argv)
 143 {
 144     setprogname (argv[0]);
 145
 146     if (argc != 2)
 147         errx (1, "usage: %s directory", argv[0]);
 148     do_dir (argv[1]);
 149     return 0;
 150 }