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 1.1 2008/09/14 20:04:59 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 /* 42 * Converts the number given in 'str', which may be given in a humanized 43 * form (as described in humanize_number(3), but with some limitations), 44 * to an int64_t without units. 45 * In case of success, 0 is returned and *size holds the value. 46 * Otherwise, -1 is returned and *size is untouched. 47 * 48 * TODO: Internationalization, SI units. 49 */ 50 int 51 dehumanize_number(const char *str, int64_t *size) 52 { 53 char *ep, unit; 54 const char *delimit; 55 long multiplier; 56 long long tmp, tmp2; 57 size_t len; 58 59 len = strlen(str); 60 if (len == 0) { 61 errno = EINVAL; 62 return -1; 63 } 64 65 multiplier = 1; 66 67 unit = str[len - 1]; 68 if (isalpha((unsigned char)unit)) { 69 switch (tolower((unsigned char)unit)) { 70 case 'b': 71 multiplier = 1; 72 break; 73 74 case 'k': 75 multiplier = 1024; 76 break; 77 78 case 'm': 79 multiplier = 1024 * 1024; 80 break; 81 82 case 'g': 83 multiplier = 1024 * 1024 * 1024; 84 break; 85 86 default: 87 errno = EINVAL; 88 return -1; /* Invalid suffix. */ 89 } 90 91 delimit = &str[len - 1]; 92 } else 93 delimit = NULL; 94 95 errno = 0; 96 tmp = strtoll(str, &ep, 10); 97 if (str[0] == '\0' || (ep != delimit && *ep != '\0')) 98 return -1; /* Not a number. */ 99 else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) 100 return -1; /* Out of range. */ 101 102 tmp2 = tmp * multiplier; 103 tmp2 = tmp2 / multiplier; 104 if (tmp != tmp2) { 105 errno = ERANGE; 106 return -1; /* Out of range. */ 107 } 108 *size = tmp * multiplier; 109 110 return 0; 111 } 112