contrib/libarchive-2.1/libarchive/archive_write_open_filename.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_open_filename.c,v 1.19 2007/01/09 08:05:56 kientzle Exp $");
  28
  29 #ifdef HAVE_SYS_STAT_H
  30 #include <sys/stat.h>
  31 #endif
  32 #ifdef HAVE_ERRNO_H
  33 #include <errno.h>
  34 #endif
  35 #ifdef HAVE_FCNTL_H
  36 #include <fcntl.h>
  37 #endif
  38 #ifdef HAVE_STDLIB_H
  39 #include <stdlib.h>
  40 #endif
  41 #ifdef HAVE_STRING_H
  42 #include <string.h>
  43 #endif
  44 #ifdef HAVE_UNISTD_H
  45 #include <unistd.h>
  46 #endif
  47
  48 #include "archive.h"
  49
  50 struct write_file_data {
  51         int             fd;
  52         char            filename[1];
  53 };
  54
  55 static int      file_close(struct archive *, void *);
  56 static int      file_open(struct archive *, void *);
  57 static ssize_t  file_write(struct archive *, void *, const void *buff, size_t);
  58
  59 int
  60 archive_write_open_file(struct archive *a, const char *filename)
  61 {
  62         return (archive_write_open_filename(a, filename));
  63 }
  64
  65 int
  66 archive_write_open_filename(struct archive *a, const char *filename)
  67 {
  68         struct write_file_data *mine;
  69
  70         if (filename == NULL || filename[0] == '\0') {
  71                 mine = (struct write_file_data *)malloc(sizeof(*mine));
  72                 if (mine == NULL) {
  73                         archive_set_error(a, ENOMEM, "No memory");
  74                         return (ARCHIVE_FATAL);
  75                 }
  76                 mine->filename[0] = '\0'; /* Record that we're using stdout. */
  77         } else {
  78                 mine = (struct write_file_data *)malloc(sizeof(*mine) + strlen(filename));
  79                 if (mine == NULL) {
  80                         archive_set_error(a, ENOMEM, "No memory");
  81                         return (ARCHIVE_FATAL);
  82                 }
  83                 strcpy(mine->filename, filename);
  84         }
  85         mine->fd = -1;
  86         return (archive_write_open(a, mine,
  87                     file_open, file_write, file_close));
  88 }
  89
  90 static int
  91 file_open(struct archive *a, void *client_data)
  92 {
  93         int flags;
  94         struct write_file_data *mine;
  95         struct stat st;
  96
  97         mine = (struct write_file_data *)client_data;
  98         flags = O_WRONLY | O_CREAT | O_TRUNC;
  99
 100         /*
 101          * Open the file.
 102          */
 103         if (mine->filename[0] != '\0') {
 104                 mine->fd = open(mine->filename, flags, 0666);
 105                 if (mine->fd < 0) {
 106                         archive_set_error(a, errno, "Failed to open '%s'",
 107                             mine->filename);
 108                         return (ARCHIVE_FATAL);
 109                 }
 110         } else {
 111                 /*
 112                  * NULL filename is stdout.
 113                  */
 114                 mine->fd = 1;
 115                 /* By default, pad archive when writing to stdout. */
 116                 if (archive_write_get_bytes_in_last_block(a) < 0)
 117                         archive_write_set_bytes_in_last_block(a, 0);
 118         }
 119
 120         if (fstat(mine->fd, &st) != 0) {
 121                archive_set_error(a, errno, "Couldn't stat '%s'",
 122                    mine->filename);
 123                return (ARCHIVE_FATAL);
 124         }
 125
 126         /*
 127          * Set up default last block handling.
 128          */
 129         if (archive_write_get_bytes_in_last_block(a) < 0) {
 130                 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode) ||
 131                     S_ISFIFO(st.st_mode))
 132                         /* Pad last block when writing to device or FIFO. */
 133                         archive_write_set_bytes_in_last_block(a, 0);
 134                 else
 135                         /* Don't pad last block otherwise. */
 136                         archive_write_set_bytes_in_last_block(a, 1);
 137         }
 138
 139         /*
 140          * If the output file is a regular file, don't add it to
 141          * itself.  If it's a device file, it's okay to add the device
 142          * entry to the output archive.
 143          */
 144         if (S_ISREG(st.st_mode))
 145                 archive_write_set_skip_file(a, st.st_dev, st.st_ino);
 146
 147         return (ARCHIVE_OK);
 148 }
 149
 150 static ssize_t
 151 file_write(struct archive *a, void *client_data, const void *buff, size_t length)
 152 {
 153         struct write_file_data  *mine;
 154         ssize_t bytesWritten;
 155
 156         mine = (struct write_file_data *)client_data;
 157         bytesWritten = write(mine->fd, buff, length);
 158         if (bytesWritten <= 0) {
 159                 archive_set_error(a, errno, "Write error");
 160                 return (-1);
 161         }
 162         return (bytesWritten);
 163 }
 164
 165 static int
 166 file_close(struct archive *a, void *client_data)
 167 {
 168         struct write_file_data  *mine = (struct write_file_data *)client_data;
 169
 170         (void)a; /* UNUSED */
 171         if (mine->filename[0] != '\0')
 172                 close(mine->fd);
 173         free(mine);
 174         return (ARCHIVE_OK);
 175 }