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 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 #ifdef __FreeBSD__ 50 if (umaxval > UINT64_MAX) 51 errno = ERANGE; 52 #endif 53 if (errno != 0) 54 return (-1); 55 errno = serrno; 56 number = umaxval; 57 58 switch (tolower((unsigned char)*endptr)) { 59 case 'e': 60 shift = 60; 61 break; 62 case 'p': 63 shift = 50; 64 break; 65 case 't': 66 shift = 40; 67 break; 68 case 'g': 69 shift = 30; 70 break; 71 case 'm': 72 shift = 20; 73 break; 74 case 'k': 75 shift = 10; 76 break; 77 case 'b': 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 if ((number << shift) >> shift != number) { 88 /* Overflow */ 89 errno = ERANGE; 90 return (-1); 91 } 92 *num = number << shift; 93 return (0); 94 } 95