1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org> 5 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <ctype.h> 35 #include <errno.h> 36 #include <inttypes.h> 37 #include <libutil.h> 38 #include <stdint.h> 39 40 int 41 expand_number(const char *buf, uint64_t *num) 42 { 43 char *endptr; 44 uintmax_t umaxval; 45 uint64_t number; 46 unsigned shift; 47 int serrno; 48 49 serrno = errno; 50 errno = 0; 51 umaxval = strtoumax(buf, &endptr, 0); 52 if (umaxval > UINT64_MAX) 53 errno = ERANGE; 54 if (errno != 0) 55 return (-1); 56 errno = serrno; 57 number = umaxval; 58 59 switch (tolower((unsigned char)*endptr)) { 60 case 'e': 61 shift = 60; 62 break; 63 case 'p': 64 shift = 50; 65 break; 66 case 't': 67 shift = 40; 68 break; 69 case 'g': 70 shift = 30; 71 break; 72 case 'm': 73 shift = 20; 74 break; 75 case 'k': 76 shift = 10; 77 break; 78 case 'b': 79 case '\0': /* No unit. */ 80 *num = number; 81 return (0); 82 default: 83 /* Unrecognized unit. */ 84 errno = EINVAL; 85 return (-1); 86 } 87 88 if ((number << shift) >> shift != number) { 89 /* Overflow */ 90 errno = ERANGE; 91 return (-1); 92 } 93 *num = number << shift; 94 return (0); 95 } 96