summaryrefslogtreecommitdiffstats
path: root/tools/h5jam/getub.c
blob: e2aec5c5be4153197a8107481add56694384f57f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>

#include "h5tools_utils.h"

void parse_command_line (int argc, const char *argv[]);

#define TRUE 1
#define FALSE 0

static char *progname="getub";
char *nbytes = NULL;

static const char *s_opts = "c:";	/* add more later ? */
static struct long_options l_opts[] = {
  {"c", require_arg, 'c'},	/* input file */
  {NULL, 0, '\0'}
};

/*-------------------------------------------------------------------------
 * Function:    usage
 *
 * Purpose:     Print the usage message 
 *
 * Return:      void
 *
 * Programmer:  
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void
usage (const char *prog)
{
  fflush (stdout);
  fprintf (stdout, "usage: %s -c nb file] \n", prog);
  fprintf (stdout, "           print first 'nb' byts of file to stdoug.\n");
}

/*-------------------------------------------------------------------------
 * Function:    parse_command_line
 *
 * Purpose:     Parse the command line for the h5dumper.
 *
 * Return:      Success:    
 *
 *              Failure:    Exits program with EXIT_FAILURE value.
 *
 * Programmer:  
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */

void
parse_command_line (int argc, const char *argv[])
{
  int opt = FALSE;

  /* parse command line options */
  while ((opt = get_option (argc, argv, s_opts, l_opts)) != EOF)
    {
      switch ((char) opt)
	{
	case 'c':
	  nbytes = strdup (opt_arg);
	  break;
	case '?':
	default:
	  usage (progname);
	  exit (EXIT_FAILURE);
	}
    }

  if (argc <= opt_ind)
    {
      error_msg (progname, "missing file name\n");
      usage (progname);
      exit (EXIT_FAILURE);
    }
}

int
main (int argc, const char *argv[])
{
  int fd;
  unsigned int size;
  char *filename;
  long res;
  char *buf;

  parse_command_line (argc, argv);

  if (nbytes == NULL)
    {
      /* missing arg */
      error_msg (progname, "missing size\n");
      usage (progname);
      exit (EXIT_FAILURE);
    }
  if (argc <= (opt_ind))
    {
      error_msg (progname, "missing file name\n");
      usage (progname);
      exit (EXIT_FAILURE);
    }
  filename = strdup (argv[opt_ind]);

  size = 0;
  res = sscanf (nbytes, "%u", &size);
  if (res == EOF)
    {
      /* fail */
      error_msg (progname, "missing file name\n");
      usage (progname);
      exit (EXIT_FAILURE);
    }

  fd = open (filename, O_RDONLY);
  if (fd < 0)
    {
      error_msg (progname, "can't open file %s\n", filename);
      exit (EXIT_FAILURE);
    }

  buf = malloc ((unsigned)(size + 1));
  if (buf == NULL)
    {
      close (fd);
      exit (EXIT_FAILURE);
    }

  res = read (fd, buf, (unsigned)size);

  if (res < size)
    {
      if (buf)
	free (buf);
      close (fd);
      exit (EXIT_FAILURE);
    }

  write (1, buf, (unsigned)size);

  if (buf)
    free (buf);
  close (fd);
  return (EXIT_SUCCESS);
}