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