LXR busybox/e2fsprogs/old_e2fsprogs/e2p/parse

   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
  15unsigned 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
  50main(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