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