contrib/libarchive-2/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 1.20 2008/02/19 05:46:58 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 #ifndef O_BINARY
  51 #define O_BINARY 0
  52 #endif
  53
  54 struct write_file_data {
  55         int             fd;
  56         char            filename[1];
  57 };
  58
  59 static int      file_close(struct archive *, void *);
  60 static int      file_open(struct archive *, void *);
  61 static ssize_t  file_write(struct archive *, void *, const void *buff, size_t);
  62
  63 int
  64 archive_write_open_file(struct archive *a, const char *filename)
  65 {
  66         return (archive_write_open_filename(a, filename));
  67 }
  68
  69 int
  70 archive_write_open_filename(struct archive *a, const char *filename)
  71 {
  72         struct write_file_data *mine;
  73
  74         if (filename == NULL || filename[0] == '\0') {
  75                 mine = (struct write_file_data *)malloc(sizeof(*mine));
  76                 if (mine == NULL) {
  77                         archive_set_error(a, ENOMEM, "No memory");
  78                         return (ARCHIVE_FATAL);
  79                 }
  80                 mine->filename[0] = '\0'; /* Record that we're using stdout. */
  81         } else {
  82                 mine = (struct write_file_data *)malloc(sizeof(*mine) + strlen(filename));
  83                 if (mine == NULL) {
  84                         archive_set_error(a, ENOMEM, "No memory");
  85                         return (ARCHIVE_FATAL);
  86                 }
  87                 strcpy(mine->filename, filename);
  88         }
  89         mine->fd = -1;
  90         return (archive_write_open(a, mine,
  91                     file_open, file_write, file_close));
  92 }
  93
  94 static int
  95 file_open(struct archive *a, void *client_data)
  96 {
  97         int flags;
  98         struct write_file_data *mine;
  99         struct stat st;
 100
 101         mine = (struct write_file_data *)client_data;
 102         flags = O_WRONLY | O_CREAT | O_TRUNC | O_BINARY;
 103
 104         /*
 105          * Open the file.
 106          */
 107         if (mine->filename[0] != '\0') {
 108                 mine->fd = open(mine->filename, flags, 0666);
 109                 if (mine->fd < 0) {
 110                         archive_set_error(a, errno, "Failed to open '%s'",
 111                             mine->filename);
 112                         return (ARCHIVE_FATAL);
 113                 }
 114         } else {
 115                 /*
 116                  * NULL filename is stdout.
 117                  */
 118                 mine->fd = 1;
 119                 /* By default, pad archive when writing to stdout. */
 120                 if (archive_write_get_bytes_in_last_block(a) < 0)
 121                         archive_write_set_bytes_in_last_block(a, 0);
 122         }
 123
 124         if (fstat(mine->fd, &st) != 0) {
 125                archive_set_error(a, errno, "Couldn't stat '%s'",
 126                    mine->filename);
 127                return (ARCHIVE_FATAL);
 128         }
 129
 130         /*
 131          * Set up default last block handling.
 132          */
 133         if (archive_write_get_bytes_in_last_block(a) < 0) {
 134                 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode) ||
 135                     S_ISFIFO(st.st_mode))
 136                         /* Pad last block when writing to device or FIFO. */
 137                         archive_write_set_bytes_in_last_block(a, 0);
 138                 else
 139                         /* Don't pad last block otherwise. */
 140                         archive_write_set_bytes_in_last_block(a, 1);
 141         }
 142
 143         /*
 144          * If the output file is a regular file, don't add it to
 145          * itself.  If it's a device file, it's okay to add the device
 146          * entry to the output archive.
 147          */
 148         if (S_ISREG(st.st_mode))
 149                 archive_write_set_skip_file(a, st.st_dev, st.st_ino);
 150
 151         return (ARCHIVE_OK);
 152 }
 153
 154 static ssize_t
 155 file_write(struct archive *a, void *client_data, const void *buff, size_t length)
 156 {
 157         struct write_file_data  *mine;
 158         ssize_t bytesWritten;
 159
 160         mine = (struct write_file_data *)client_data;
 161         bytesWritten = write(mine->fd, buff, length);
 162         if (bytesWritten <= 0) {
 163                 archive_set_error(a, errno, "Write error");
 164                 return (-1);
 165         }
 166         return (bytesWritten);
 167 }
 168
 169 static int
 170 file_close(struct archive *a, void *client_data)
 171 {
 172         struct write_file_data  *mine = (struct write_file_data *)client_data;
 173
 174         (void)a; /* UNUSED */
 175         if (mine->filename[0] != '\0')
 176                 close(mine->fd);
 177         free(mine);
 178         return (ARCHIVE_OK);
 179 }