/* * 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