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 #include <sys/types.h> 32 #include <ctype.h> 33 #include <errno.h> 34 #include <inttypes.h> 35 #include <libutil.h> 36 #include <stdint.h> 37 38 int 39 expand_number(const char *buf, uint64_t *num) 40 { 41 char *endptr; 42 uintmax_t umaxval; 43 uint64_t number; 44 unsigned shift; 45 int serrno; 46 47 serrno = errno; 48 errno = 0; 49 umaxval = strtoumax(buf, &endptr, 0); 50 if (umaxval > UINT64_MAX) 51 errno = ERANGE; 52 if (errno != 0) 53 return (-1); 54 errno = serrno; 55 number = umaxval; 56 57 switch (tolower((unsigned char)*endptr)) { 58 case 'e': 59 shift = 60; 60 break; 61 case 'p': 62 shift = 50; 63 break; 64 case 't': 65 shift = 40; 66 break; 67 case 'g': 68 shift = 30; 69 break; 70 case 'm': 71 shift = 20; 72 break; 73 case 'k': 74 shift = 10; 75 break; 76 case 'b': 77 shift = 0; 78 break; 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 /* 89 * Treat 'b' as an ignored suffix for all unit except 'b', 90 * otherwise there should be no remaining character(s). 91 */ 92 endptr++; 93 if (shift != 0 && tolower((unsigned char)*endptr) == 'b') 94 endptr++; 95 if (*endptr != '\0') { 96 errno = EINVAL; 97 return (-1); 98 } 99 100 if ((number << shift) >> shift != number) { 101 /* Overflow */ 102 errno = ERANGE; 103 return (-1); 104 } 105 *num = number << shift; 106 return (0); 107 } 108