1 /*- 2 * Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org> 3 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: head/lib/libutil/expand_number.c 255069 2013-08-30 11:21:52Z pluknet $"); 30 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 case '\0': /* No unit. */ 78 *num = number; 79 return (0); 80 default: 81 /* Unrecognized unit. */ 82 errno = EINVAL; 83 return (-1); 84 } 85 86 if ((number << shift) >> shift != number) { 87 /* Overflow */ 88 errno = ERANGE; 89 return (-1); 90 } 91 *num = number << shift; 92 return (0); 93 } 94