source: MondoRescue/branches/2.2.9/mindi-busybox/e2fsprogs/old_e2fsprogs/e2p/parse_num.c@ 3320

/* vi: set sw=4 ts=4: */
/*
 * parse_num.c      - Parse the number of blocks
 *
 * Copyright (C) 2004,2005  Theodore Ts'o <tytso@mit.edu>
 *
 * This file can be redistributed under the terms of the GNU Library General
 * Public License
 */

#include "e2p.h"

#include <stdlib.h>

unsigned long parse_num_blocks(const char *arg, int log_block_size)
{
    char *p;
    unsigned long long num;

    num = strtoull(arg, &p, 0);

    if (p[0] && p[1])
        return 0;

    switch (*p) {       /* Using fall-through logic */
    case 'T': case 't':
        num <<= 10;
    case 'G': case 'g':
        num <<= 10;
    case 'M': case 'm':
        num <<= 10;
    case 'K': case 'k':
        num >>= log_block_size;
        break;
    case 's':
        num >>= 1;
        break;
    case '\0':
        break;
    default:
        return 0;
    }
    return num;
}

#ifdef DEBUG
#include <unistd.h>
#include <stdio.h>

main(int argc, char **argv)
{
    unsigned long num;
    int log_block_size = 0;

    if (argc != 2) {
        fprintf(stderr, "Usage: %s arg\n", argv[0]);
        exit(1);
    }

    num = parse_num_blocks(argv[1], log_block_size);

    printf("Parsed number: %lu\n", num);
    exit(0);
}
#endif