1 /* $NetBSD: dehumanize_number.c,v 1.3 2008/04/28 20:22:59 martin Exp $ */ 2 /* $DragonFly: src/lib/libutil/dehumanize_number.c,v 1.2 2008/10/29 22:03:12 swildner Exp $ */ 3 4 /* 5 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 10 * 2005 program. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <inttypes.h> 35 #include <ctype.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <errno.h> 39 #include <limits.h> 40 41 #include "libutil.h" 42 43 /* 44 * Converts the number given in 'str', which may be given in a humanized 45 * form (as described in humanize_number(3), but with some limitations), 46 * to an int64_t without units. 47 * In case of success, 0 is returned and *size holds the value. 48 * Otherwise, -1 is returned and *size is untouched. 49 * 50 * TODO: Internationalization, SI units. 51 */ 52 int 53 dehumanize_number(const char *str, int64_t *size) 54 { 55 char *ep, unit; 56 const char *delimit; 57 long multiplier; 58 long long tmp, tmp2; 59 size_t len; 60 61 len = strlen(str); 62 if (len == 0) { 63 errno = EINVAL; 64 return -1; 65 } 66 67 multiplier = 1; 68 69 unit = str[len - 1]; 70 if (isalpha((unsigned char)unit)) { 71 switch (tolower((unsigned char)unit)) { 72 case 'b': 73 multiplier = 1; 74 break; 75 76 case 'k': 77 multiplier = 1024; 78 break; 79 80 case 'm': 81 multiplier = 1024 * 1024; 82 break; 83 84 case 'g': 85 multiplier = 1024 * 1024 * 1024; 86 break; 87 88 default: 89 errno = EINVAL; 90 return -1; /* Invalid suffix. */ 91 } 92 93 delimit = &str[len - 1]; 94 } else 95 delimit = NULL; 96 97 errno = 0; 98 tmp = strtoll(str, &ep, 10); 99 if (str[0] == '\0' || (ep != delimit && *ep != '\0')) 100 return -1; /* Not a number. */ 101 else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) 102 return -1; /* Out of range. */ 103 104 tmp2 = tmp * multiplier; 105 tmp2 = tmp2 / multiplier; 106 if (tmp != tmp2) { 107 errno = ERANGE; 108 return -1; /* Out of range. */ 109 } 110 *size = tmp * multiplier; 111 112 return 0; 113 } 114