digests, copy-file: increase the IO buffer size from 4KiB to 32KiB

[gnulib.git] / lib / copy-file.c

diff --git a/lib/copy-file.c b/lib/copy-file.c
index 5416c76..939fd07 100644 (file)
--- a/lib/copy-file.c
+++ b/lib/copy-file.c
@@ -2,10 +2,10 @@
    Copyright (C) 2001-2003, 2006-2007 Free Software Foundation, Inc.
    Written by Bruno Haible <haible@clisp.cons.org>, 2001.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,8 +13,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
 #include <config.h>
@@ -43,6 +42,7 @@
 #include "acl.h"
 #include "binary-io.h"
 #include "gettext.h"
+#include "xalloc.h"
 
 #define _(str) gettext (str)
 
@@ -51,6 +51,7 @@
 #undef open
 #undef close
 
+enum { IO_SIZE = 32 * 1024 };
 
 void
 copy_file_preserving (const char *src_filename, const char *dest_filename)
@@ -59,8 +60,7 @@ copy_file_preserving (const char *src_filename, const char *dest_filename)
   struct stat statbuf;
   int mode;
   int dest_fd;
-  char buf[4096];
-  const size_t buf_size = sizeof (buf);
+  char *buf = xmalloc (IO_SIZE);
 
   src_fd = open (src_filename, O_RDONLY | O_BINARY);
   if (src_fd < 0 || fstat (src_fd, &statbuf) < 0)
@@ -77,7 +77,7 @@ copy_file_preserving (const char *src_filename, const char *dest_filename)
   /* Copy the file contents.  */
   for (;;)
     {
-      size_t n_read = safe_read (src_fd, buf, buf_size);
+      size_t n_read = safe_read (src_fd, buf, IO_SIZE);
       if (n_read == SAFE_READ_ERROR)
        error (EXIT_FAILURE, errno, _("error reading \"%s\""), src_filename);
       if (n_read == 0)
@@ -87,6 +87,8 @@ copy_file_preserving (const char *src_filename, const char *dest_filename)
        error (EXIT_FAILURE, errno, _("error writing \"%s\""), dest_filename);
     }
 
+  free (buf);
+
 #if !USE_ACL
   if (close (dest_fd) < 0)
     error (EXIT_FAILURE, errno, _("error writing \"%s\""), dest_filename);