1/*
2 * parse_num.c		- Parse the number of blocks
3 *
4 * Copyright (C) 2004,2005  Theodore Ts'o <tytso@mit.edu>
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12#include "e2p.h"
13
14#include <stdlib.h>
15
16unsigned long parse_num_blocks(const char *arg, int log_block_size)
17{
18	char *p;
19	unsigned long long num;
20
21	num = strtoull(arg, &p, 0);
22
23	if (p[0] && p[1])
24		return 0;
25
26	switch (*p) {		/* Using fall-through logic */
27	case 'T': case 't':
28		num <<= 10;
29	case 'G': case 'g':
30		num <<= 10;
31	case 'M': case 'm':
32		num <<= 10;
33	case 'K': case 'k':
34		num >>= log_block_size;
35		break;
36	case 's':
37		num >>= (1+log_block_size);
38		break;
39	case '\0':
40		break;
41	default:
42		return 0;
43	}
44	return num;
45}
46
47#ifdef DEBUG
48#include <unistd.h>
49#include <stdio.h>
50
51main(int argc, char **argv)
52{
53	unsigned long num;
54	int log_block_size = 0;
55
56	if (argc != 2) {
57		fprintf(stderr, "Usage: %s arg\n", argv[0]);
58		exit(1);
59	}
60
61	num = parse_num_blocks(argv[1], log_block_size);
62
63	printf("Parsed number: %lu\n", num);
64	exit(0);
65}
66#endif
67