1 /* $NetBSD: dehumanize_number.c,v 1.2 2007/12/14 17:32:47 xtraeme 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 __RCSID("$NetBSD: dehumanize_number.c,v 1.2 2007/12/14 17:32:47 xtraeme Exp $"); 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 #include <inttypes.h> 46 #include <ctype.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <errno.h> 50 #include <limits.h> 51 52 /* 53 * Converts the number given in 'str', which may be given in a humanized 54 * form (as described in humanize_number(3), but with some limitations), 55 * to an int64_t without units. 56 * In case of success, 0 is returned and *size holds the value. 57 * Otherwise, -1 is returned and *size is untouched. 58 * 59 * TODO: Internationalization, SI units. 60 */ 61 int 62 dehumanize_number(const char *str, int64_t *size) 63 { 64 char *ep, unit; 65 const char *delimit; 66 long multiplier; 67 long long tmp, tmp2; 68 size_t len; 69 70 len = strlen(str); 71 if (len == 0) { 72 errno = EINVAL; 73 return -1; 74 } 75 76 multiplier = 1; 77 78 unit = str[len - 1]; 79 if (isalpha((unsigned char)unit)) { 80 switch (tolower((unsigned char)unit)) { 81 case 'b': 82 multiplier = 1; 83 break; 84 85 case 'k': 86 multiplier = 1024; 87 break; 88 89 case 'm': 90 multiplier = 1024 * 1024; 91 break; 92 93 case 'g': 94 multiplier = 1024 * 1024 * 1024; 95 break; 96 97 default: 98 errno = EINVAL; 99 return -1; /* Invalid suffix. */ 100 } 101 102 delimit = &str[len - 1]; 103 } else 104 delimit = NULL; 105 106 errno = 0; 107 tmp = strtoll(str, &ep, 10); 108 if (str[0] == '\0' || (ep != delimit && *ep != '\0')) 109 return -1; /* Not a number. */ 110 else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) 111 return -1; /* Out of range. */ 112 113 tmp2 = tmp * multiplier; 114 tmp2 = tmp2 / multiplier; 115 if (tmp != tmp2) { 116 errno = ERANGE; 117 return -1; /* Out of range. */ 118 } 119 *size = tmp * multiplier; 120 121 return 0; 122 } 123