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/*
* parse_num.c - Parse the number of blocks
*
* Copyright (C) 2004,2005 Theodore Ts'o <tytso@mit.edu>
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include "config.h"
#include "e2p.h"
#include <stdlib.h>
unsigned long long parse_num_blocks2(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;
/* fallthrough */
case 'G': case 'g':
num <<= 10;
/* fallthrough */
case 'M': case 'm':
num <<= 10;
/* fallthrough */
case 'K': case 'k':
if (log_block_size < 0)
num <<= 10;
else
num >>= log_block_size;
break;
case 's':
if (log_block_size < 0)
num <<= 9;
else
num >>= (1+log_block_size);
break;
case '\0':
break;
default:
return 0;
}
return num;
}
unsigned long parse_num_blocks(const char *arg, int log_block_size)
{
return parse_num_blocks2(arg, log_block_size);
}
#ifdef DEBUG
#include <unistd.h>
#include <stdio.h>
main(int argc, char **argv)
{
unsigned long num;
int log_block_size = 0;
if (argc != 2 && argc != 3) {
fprintf(stderr, "Usage: %s arg [log_block_size]\n", argv[0]);
exit(1);
}
if (argc == 3) {
char *p;
log_block_size = strtol(argv[2], &p, 0);
if (*p) {
fprintf(stderr, "Bad log_block_size: %s\n", argv[2]);
exit(1);
}
}
num = parse_num_blocks(argv[1], log_block_size);
printf("Parsed number: %lu\n", num);
exit(0);
}
#endif
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