expand_number.c revision 180347
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org> 31556Srgrimes * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 41556Srgrimes * All rights reserved. 51556Srgrimes * 61556Srgrimes * Redistribution and use in source and binary forms, with or without 71556Srgrimes * modification, are permitted provided that the following conditions 81556Srgrimes * are met: 91556Srgrimes * 1. Redistributions of source code must retain the above copyright 101556Srgrimes * notice, this list of conditions and the following disclaimer. 111556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer in the 131556Srgrimes * documentation and/or other materials provided with the distribution. 141556Srgrimes * 151556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 161556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 171556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 181556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 191556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 201556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 211556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 221556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 231556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 241556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 251556Srgrimes * SUCH DAMAGE. 261556Srgrimes */ 271556Srgrimes 281556Srgrimes#include <sys/cdefs.h> 291556Srgrimes__FBSDID("$FreeBSD: head/lib/libutil/expand_number.c 180347 2008-07-07 12:20:34Z kib $"); 301556Srgrimes 311556Srgrimes#include <sys/types.h> 321556Srgrimes#include <ctype.h> 331556Srgrimes#include <errno.h> 341556Srgrimes#include <inttypes.h> 351556Srgrimes#include <libutil.h> 3617987Speter#include <stdint.h> 3738521Scracauer 381556Srgrimes/* 391556Srgrimes * Convert an expression of the following forms to a int64_t. 401556Srgrimes * 1) A positive decimal number. 4138521Scracauer * 2) A positive decimal number followed by a 'b' or 'B' (mult by 1). 421556Srgrimes * 3) A positive decimal number followed by a 'k' or 'K' (mult by 1 << 10). 4317987Speter * 4) A positive decimal number followed by a 'm' or 'M' (mult by 1 << 20). 4420425Ssteve * 5) A positive decimal number followed by a 'g' or 'G' (mult by 1 << 30). 4531098Sbde * 6) A positive decimal number followed by a 't' or 'T' (mult by 1 << 40). 4617987Speter * 7) A positive decimal number followed by a 'p' or 'P' (mult by 1 << 50). 4717987Speter * 8) A positive decimal number followed by a 'e' or 'E' (mult by 1 << 60). 4817987Speter */ 4917987Speterint 5020425Ssteveexpand_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