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("$FreeBSD$"); 30 31 #include <sys/types.h> 32 #include <ctype.h> 33 #include <errno.h> 34 #include <libutil.h> 35 #include <stdint.h> 36 37 /* 38 * Convert an expression of the following forms to a int64_t. 39 * 1) A positive decimal number. 40 * 2) A positive decimal number followed by a 'b' or 'B' (mult by 1). 41 * 3) A positive decimal number followed by a 'k' or 'K' (mult by 1 << 10). 42 * 4) A positive decimal number followed by a 'm' or 'M' (mult by 1 << 20). 43 * 5) A positive decimal number followed by a 'g' or 'G' (mult by 1 << 30). 44 * 6) A positive decimal number followed by a 't' or 'T' (mult by 1 << 40). 45 * 7) A positive decimal number followed by a 'p' or 'P' (mult by 1 << 50). 46 * 8) A positive decimal number followed by a 'e' or 'E' (mult by 1 << 60). 47 */ 48 int 49 expand_number(const char *buf, int64_t *num) 50 { 51 static const char unit[] = "bkmgtpe"; 52 char *endptr, s; 53 int64_t number; 54 int i; 55 56 number = strtoimax(buf, &endptr, 0); 57 58 if (endptr == buf) { 59 /* No valid digits. */ 60 errno = EINVAL; 61 return (-1); 62 } 63 64 if (*endptr == '\0') { 65 /* No unit. */ 66 *num = number; 67 return (0); 68 } 69 70 s = tolower(*endptr); 71 switch (s) { 72 case 'b': 73 case 'k': 74 case 'm': 75 case 'g': 76 case 't': 77 case 'p': 78 case 'e': 79 break; 80 default: 81 /* Unrecognized unit. */ 82 errno = EINVAL; 83 return (-1); 84 } 85 86 for (i = 0; unit[i] != '\0'; i++) { 87 if (s == unit[i]) 88 break; 89 if ((number < 0 && (number << 10) > number) || 90 (number >= 0 && (number << 10) < number)) { 91 errno = ERANGE; 92 return (-1); 93 } 94 number <<= 10; 95 } 96 97 *num = number; 98 return (0); 99 } 100