92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
/*
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* parse_num.c - Parse the number of blocks
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*
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* Copyright (C) 2004,2005 Theodore Ts'o <tytso@mit.edu>
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include "config.h"
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#include "e2p.h"
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#include <stdlib.h>
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unsigned long long parse_num_blocks2(const char *arg, int log_block_size)
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{
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char *p;
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unsigned long long num;
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num = strtoull(arg, &p, 0);
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if (p[0] && p[1])
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return 0;
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switch (*p) { /* Using fall-through logic */
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case 'T': case 't':
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num <<= 10;
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/* fallthrough */
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case 'G': case 'g':
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num <<= 10;
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/* fallthrough */
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case 'M': case 'm':
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num <<= 10;
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/* fallthrough */
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case 'K': case 'k':
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if (log_block_size < 0)
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num <<= 10;
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else
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num >>= log_block_size;
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break;
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case 's':
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if (log_block_size < 0)
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num <<= 9;
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else
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num >>= (1+log_block_size);
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break;
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case '\0':
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break;
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default:
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return 0;
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}
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return num;
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}
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unsigned long parse_num_blocks(const char *arg, int log_block_size)
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{
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return parse_num_blocks2(arg, log_block_size);
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}
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#ifdef DEBUG
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#include <unistd.h>
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#include <stdio.h>
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main(int argc, char **argv)
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{
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unsigned long num;
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int log_block_size = 0;
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if (argc != 2 && argc != 3) {
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fprintf(stderr, "Usage: %s arg [log_block_size]\n", argv[0]);
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exit(1);
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}
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if (argc == 3) {
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char *p;
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log_block_size = strtol(argv[2], &p, 0);
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if (*p) {
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fprintf(stderr, "Bad log_block_size: %s\n", argv[2]);
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exit(1);
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}
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}
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num = parse_num_blocks(argv[1], log_block_size);
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printf("Parsed number: %lu\n", num);
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exit(0);
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}
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#endif
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