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/types.h> 31 #include <ctype.h> 32 #include <errno.h> 33 #include <inttypes.h> 34 #include <libutil.h> 35 #include <stdint.h> 36 37 int 38 expand_number(const char *buf, uint64_t *num) 39 { 40 char *endptr; 41 uintmax_t umaxval; 42 uint64_t number; 43 unsigned shift; 44 int serrno; 45 46 serrno = errno; 47 errno = 0; 48 umaxval = strtoumax(buf, &endptr, 0); 49 if (umaxval > UINT64_MAX) 50 errno = ERANGE; 51 if (errno != 0) 52 return (-1); 53 errno = serrno; 54 number = umaxval; 55 56 switch (tolower((unsigned char)*endptr)) { 57 case 'e': 58 shift = 60; 59 break; 60 case 'p': 61 shift = 50; 62 break; 63 case 't': 64 shift = 40; 65 break; 66 case 'g': 67 shift = 30; 68 break; 69 case 'm': 70 shift = 20; 71 break; 72 case 'k': 73 shift = 10; 74 break; 75 case 'b': 76 shift = 0; 77 break; 78 case '\0': /* No unit. */ 79 *num = number; 80 return (0); 81 default: 82 /* Unrecognized unit. */ 83 errno = EINVAL; 84 return (-1); 85 } 86 87 /* 88 * Treat 'b' as an ignored suffix for all unit except 'b', 89 * otherwise there should be no remaining character(s). 90 */ 91 endptr++; 92 if (shift != 0 && tolower((unsigned char)*endptr) == 'b') 93 endptr++; 94 if (*endptr != '\0') { 95 errno = EINVAL; 96 return (-1); 97 } 98 99 if ((number << shift) >> shift != number) { 100 /* Overflow */ 101 errno = ERANGE; 102 return (-1); 103 } 104 *num = number << shift; 105 return (0); 106 } 107