1 /* 2 * parse_num.c - Parse the number of blocks 3 * 4 * Copyright (C) 2004,2005 Theodore Ts'o <tytso (at) 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 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 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
