blob: 6db076f9cd34440b9bd10e72d526a797b94518c8
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * parse_num.c - Parse the number of blocks |
4 | * |
5 | * Copyright (C) 2004,2005 Theodore Ts'o <tytso@mit.edu> |
6 | * |
7 | * This file can be redistributed under the terms of the GNU Library General |
8 | * Public License |
9 | */ |
10 | |
11 | #include "e2p.h" |
12 | |
13 | #include <stdlib.h> |
14 | |
15 | unsigned long parse_num_blocks(const char *arg, int log_block_size) |
16 | { |
17 | char *p; |
18 | unsigned long long num; |
19 | |
20 | num = strtoull(arg, &p, 0); |
21 | |
22 | if (p[0] && p[1]) |
23 | return 0; |
24 | |
25 | switch (*p) { /* Using fall-through logic */ |
26 | case 'T': case 't': |
27 | num <<= 10; |
28 | case 'G': case 'g': |
29 | num <<= 10; |
30 | case 'M': case 'm': |
31 | num <<= 10; |
32 | case 'K': case 'k': |
33 | num >>= log_block_size; |
34 | break; |
35 | case 's': |
36 | num >>= 1; |
37 | break; |
38 | case '\0': |
39 | break; |
40 | default: |
41 | return 0; |
42 | } |
43 | return num; |
44 | } |
45 | |
46 | #ifdef DEBUG |
47 | #include <unistd.h> |
48 | #include <stdio.h> |
49 | |
50 | main(int argc, char **argv) |
51 | { |
52 | unsigned long num; |
53 | int log_block_size = 0; |
54 | |
55 | if (argc != 2) { |
56 | fprintf(stderr, "Usage: %s arg\n", argv[0]); |
57 | exit(1); |
58 | } |
59 | |
60 | num = parse_num_blocks(argv[1], log_block_size); |
61 | |
62 | printf("Parsed number: %lu\n", num); |
63 | exit(0); |
64 | } |
65 | #endif |
66 |