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lib/e2p/parse_num.c
91 строка
2 KB
Jan Kara
e2p: Fix 's' handling in parse_num_blocks2()
01 мар 2013, 05:12
01 мар 2013, 05:12
9e20cf2
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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