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 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 __RCSID("$NetBSD: dehumanize_number.c,v 1.3 2008/04/28 20:22:59 martin Exp $"); 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include "namespace.h" 38 #include <inttypes.h> 39 #include <ctype.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <errno.h> 43 #include <limits.h> 44 45 /* 46 * Converts the number given in 'str', which may be given in a humanized 47 * form (as described in humanize_number(3), but with some limitations), 48 * to an int64_t without units. 49 * In case of success, 0 is returned and *size holds the value. 50 * Otherwise, -1 is returned and *size is untouched. 51 * 52 * TODO: Internationalization, SI units. 53 */ 54 int 55 dehumanize_number(const char *str, int64_t *size) 56 { 57 char *ep, unit; 58 const char *delimit; 59 long multiplier; 60 long long tmp, tmp2; 61 size_t len; 62 63 len = strlen(str); 64 if (len == 0) { 65 errno = EINVAL; 66 return -1; 67 } 68 69 multiplier = 1; 70 71 unit = str[len - 1]; 72 if (isalpha((unsigned char)unit)) { 73 switch (tolower((unsigned char)unit)) { 74 case 'b': 75 multiplier = 1; 76 break; 77 78 case 'k': 79 multiplier = 1024; 80 break; 81 82 case 'm': 83 multiplier = 1024 * 1024; 84 break; 85 86 case 'g': 87 multiplier = 1024 * 1024 * 1024; 88 break; 89 90 default: 91 errno = EINVAL; 92 return -1; /* Invalid suffix. */ 93 } 94 95 delimit = &str[len - 1]; 96 } else 97 delimit = NULL; 98 99 errno = 0; 100 tmp = strtoll(str, &ep, 10); 101 if (str[0] == '\0' || (ep != delimit && *ep != '\0')) 102 return -1; /* Not a number. */ 103 else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) 104 return -1; /* Out of range. */ 105 106 tmp2 = tmp * multiplier; 107 tmp2 = tmp2 / multiplier; 108 if (tmp != tmp2) { 109 errno = ERANGE; 110 return -1; /* Out of range. */ 111 } 112 *size = tmp * multiplier; 113 114 return 0; 115 } 116