1 /* $NetBSD: dehumanize_number.c,v 1.4 2012/03/13 21:13:34 christos 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 1.4 2012/03/13 21:13:34 christos Exp $"); 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include "namespace.h" 38 #include <assert.h> 39 #include <inttypes.h> 40 #include <ctype.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <errno.h> 44 #include <limits.h> 45 46 /* 47 * Converts the number given in 'str', which may be given in a humanized 48 * form (as described in humanize_number(3), but with some limitations), 49 * to an int64_t without units. 50 * In case of success, 0 is returned and *size holds the value. 51 * Otherwise, -1 is returned and *size is untouched. 52 * 53 * TODO: Internationalization, SI units. 54 */ 55 int 56 dehumanize_number(const char *str, int64_t *size) 57 { 58 char *ep, unit; 59 const char *delimit; 60 long multiplier; 61 long long tmp, tmp2; 62 size_t len; 63 64 len = strlen(str); 65 if (len == 0) { 66 errno = EINVAL; 67 return -1; 68 } 69 70 multiplier = 1; 71 72 unit = str[len - 1]; 73 if (isalpha((unsigned char)unit)) { 74 switch (tolower((unsigned char)unit)) { 75 case 'b': 76 multiplier = 1; 77 break; 78 79 case 'k': 80 multiplier = 1024; 81 break; 82 83 case 'm': 84 multiplier = 1024 * 1024; 85 break; 86 87 case 'g': 88 multiplier = 1024 * 1024 * 1024; 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 tmp *= multiplier; 114 _DIAGASSERT(__type_fit(int64_t, tmp)); 115 *size = (int64_t)tmp; 116 117 return 0; 118 } 119