lib/roken/dumpdata.c

   1 /*
   2  * Copyright (c) 2005 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 #include <config.h>
  35
  36 #include <unistd.h>
  37
  38 #include "roken.h"
  39
  40 /*
  41  * Write datablob to a filename, don't care about errors.
  42  */
  43
  44 void ROKEN_LIB_FUNCTION
  45 rk_dumpdata (const char *filename, const void *buf, size_t size)
  46 {
  47     int fd;
  48
  49     fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0640);
  50     if (fd < 0)
  51         return;
  52     net_write(fd, buf, size);
  53     close(fd);
  54 }
  55
  56 /*
  57  * Read all data from a filename, care about errors.
  58  */
  59
  60 int ROKEN_LIB_FUNCTION
  61 rk_undumpdata(const char *filename, void **buf, size_t *size)
  62 {
  63     struct stat sb;
  64     int fd, ret;
  65     ssize_t sret;
  66
  67     *buf = NULL;
  68
  69     fd = open(filename, O_RDONLY, 0);
  70     if (fd < 0)
  71         return errno;
  72     if (fstat(fd, &sb) != 0){
  73         ret = errno;
  74         goto out;
  75     }
  76     *buf = malloc(sb.st_size);
  77     if (*buf == NULL) {
  78         ret = ENOMEM;
  79         goto out;
  80     }
  81     *size = sb.st_size;
  82
  83     sret = net_read(fd, *buf, *size);
  84     if (sret < 0)
  85         ret = errno;
  86     else if (sret != *size) {
  87         ret = EINVAL;
  88         free(*buf);
  89         *buf = NULL;
  90     } else
  91         ret = 0;
  92
  93  out:
  94     close(fd);
  95     return ret;
  96 }