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 <inttypes.h> 35 #include <libutil.h> 36 #include <stdint.h> 37 38 /* 39 * Convert an expression of the following forms to a int64_t. 40 * 1) A positive decimal number. 41 * 2) A positive decimal number followed by a 'b' or 'B' (mult by 1). 42 * 3) A positive decimal number followed by a 'k' or 'K' (mult by 1 << 10). 43 * 4) A positive decimal number followed by a 'm' or 'M' (mult by 1 << 20). 44 * 5) A positive decimal number followed by a 'g' or 'G' (mult by 1 << 30). 45 * 6) A positive decimal number followed by a 't' or 'T' (mult by 1 << 40). 46 * 7) A positive decimal number followed by a 'p' or 'P' (mult by 1 << 50). 47 * 8) A positive decimal number followed by a 'e' or 'E' (mult by 1 << 60). 48 */ 49 int 50 expand_number(const char *buf, int64_t *num) 51 { 52 static const char unit[] = "bkmgtpe"; 53 char *endptr, s; 54 int64_t number; 55 int i; 56 57 number = strtoimax(buf, &endptr, 0); 58 59 if (endptr == buf) { 60 /* No valid digits. */ 61 errno = EINVAL; 62 return (-1); 63 } 64 65 if (*endptr == '\0') { 66 /* No unit. */ 67 *num = number; 68 return (0); 69 } 70 71 s = tolower(*endptr); 72 switch (s) { 73 case 'b': 74 case 'k': 75 case 'm': 76 case 'g': 77 case 't': 78 case 'p': 79 case 'e': 80 break; 81 default: 82 /* Unrecognized unit. */ 83 errno = EINVAL; 84 return (-1); 85 } 86 87 for (i = 0; unit[i] != '\0'; i++) { 88 if (s == unit[i]) 89 break; 90 if ((number < 0 && (number << 10) > number) || 91 (number >= 0 && (number << 10) < number)) { 92 errno = ERANGE; 93 return (-1); 94 } 95 number <<= 10; 96 } 97 98 *num = number; 99 return (0); 100 } 101