1 /* $NetBSD: dehumanize_number.c,v 1.3 2008/04/28 20:22:59 martin Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <inttypes.h> 34 #include <ctype.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <errno.h> 38 #include <limits.h> 39 #include <libutil.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 'e': 71 multiplier *= 1024; 72 /* FALLTHROUGH */ 73 case 'p': 74 multiplier *= 1024; 75 /* FALLTHROUGH */ 76 case 't': 77 multiplier *= 1024; 78 /* FALLTHROUGH */ 79 case 'g': 80 multiplier *= 1024; 81 /* FALLTHROUGH */ 82 case 'm': 83 multiplier *= 1024; 84 /* FALLTHROUGH */ 85 case 'k': 86 multiplier *= 1024; 87 /* FALLTHROUGH */ 88 case 'b': 89 break; 90 91 default: 92 errno = EINVAL; 93 return -1; /* Invalid suffix. */ 94 } 95 96 delimit = &str[len - 1]; 97 } else 98 delimit = NULL; 99 100 errno = 0; 101 tmp = strtoll(str, &ep, 10); 102 if (str[0] == '\0' || (ep != delimit && *ep != '\0')) 103 return -1; /* Not a number. */ 104 else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) 105 return -1; /* Out of range. */ 106 107 tmp2 = tmp * multiplier; 108 tmp2 = tmp2 / multiplier; 109 if (tmp != tmp2) { 110 errno = ERANGE; 111 return -1; /* Out of range. */ 112 } 113 *size = tmp * multiplier; 114 115 return 0; 116 } 117