New file.

tests/mksparse.c

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+/* This file is part of GNU tar test suite
+
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+   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.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 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.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <string.h>
+
+char *progname;
+char *buffer;
+size_t buffer_size;
+
+void
+die (char *fmt, ...)
+{
+  va_list ap;
+
+  fprintf (stderr, "%s: ", progname);
+  va_start (ap, fmt);
+  vfprintf (stderr, fmt, ap);
+  va_end (ap);
+  fprintf (stderr, "\n");
+}
+
+void
+mkhole (int fd, off_t displ)
+{
+  if (displ = lseek (fd, displ, SEEK_CUR) == -1)
+    {
+      perror ("lseek");
+      exit (1);
+    }
+  ftruncate (fd, lseek (fd, 0, SEEK_CUR));
+}
+
+void
+mksparse (int fd, off_t displ, char *marks)
+{
+  int i;
+
+  for (; *marks; marks++)
+    {
+      memset (buffer, *marks, buffer_size);
+      if (write(fd, buffer, buffer_size) != buffer_size)
+	{
+	  perror ("write");
+	  exit (1);
+	}
+      
+      if (lseek (fd, displ, SEEK_CUR) == -1)
+	{
+	  perror ("lseek");
+	  exit (1);
+	}
+    }
+}
+
+void
+usage ()
+{
+  printf ("Usage: mksparse filename blocksize disp letters [disp letters...] [disp]\n");
+  exit (1);
+}
+
+int
+xlat_suffix (off_t *vp, char *p)
+{
+  if (p[1])
+    return 1;
+  switch (p[0])
+    {
+    case 'g':
+    case 'G':
+      *vp *= 1024;
+      
+    case 'm':
+    case 'M':
+      *vp *= 1024;
+
+    case 'k':
+    case 'K':
+      *vp *= 1024;
+      break;
+
+    default:
+      return 1;
+    }
+  return 0;
+}
+    
+int
+main (int argc, char **argv)
+{
+  int i;
+  int fd;
+  char *p;
+  off_t n;
+  
+  progname = strrchr (argv[0], '/');
+  if (progname)
+    progname++;
+  else
+    progname = argv[0];
+  
+  if (argc < 4)
+    usage ();
+
+  fd = open (argv[1], O_CREAT|O_TRUNC|O_RDWR, 0644);
+  if (fd < 0)
+    die ("cannot open %s", argv[1]);
+  
+  n = strtoul (argv[2], &p, 0);
+  if (n <= 0 || (*p && xlat_suffix (&n, p)))
+    die ("Invalid buffer size: %s", argv[2]);
+  buffer_size = n;
+  buffer = malloc (buffer_size);
+  if (!buffer)
+    die ("Not enough memory");
+  
+  for (i = 3; i < argc; i += 2)
+    {
+      off_t displ;
+      
+      displ = strtoul (argv[i], &p, 0);
+      if (displ < 0 || (*p && xlat_suffix (&displ, p)))
+	die ("Invalid displacement: %s", argv[i]);
+
+      if (i == argc-1)
+	{
+	  mkhole (fd, displ);
+	  break;
+	}
+      else
+	mksparse (fd, displ, argv[i+1]);
+    }
+      
+  close(fd);
+  return 0;
+}