1 /* $NetBSD: dehumanize_number.c,v 1.8 2020/08/18 19:18:06 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 33 #ifdef HAVE_NBTOOL_CONFIG_H 34 #include "nbtool_config.h" 35 #endif /* HAVE_NBTOOL_CONFIG_H */ 36 37 #include <sys/cdefs.h> 38 #if defined(LIBC_SCCS) && !defined(lint) 39 __RCSID("$NetBSD: dehumanize_number.c,v 1.8 2020/08/18 19:18:06 christos Exp $"); 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include "namespace.h" 43 #include <assert.h> 44 #include <inttypes.h> 45 #include <ctype.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <errno.h> 49 #include <limits.h> 50 51 /* 52 * Converts the number given in 'str', which may be given in a humanized 53 * form (as described in humanize_number(3), but with some limitations), 54 * to an int64_t without units. 55 * In case of success, 0 is returned and *size holds the value. 56 * Otherwise, -1 is returned and *size is untouched. 57 * 58 * TODO: Internationalization, SI units. 59 */ 60 int 61 dehumanize_number(const char *str, int64_t *size) 62 { 63 char *ep, unit; 64 const char *delimit; 65 long multiplier; 66 long long tmp, tmp2; 67 size_t len; 68 69 len = strlen(str); 70 if (len == 0) { 71 errno = EINVAL; 72 return -1; 73 } 74 75 multiplier = 1; 76 77 unit = str[len - 1]; 78 if (isalpha((unsigned char)unit)) { 79 switch (tolower((unsigned char)unit)) { 80 case 'b': 81 multiplier = 1; 82 break; 83 84 case 'k': 85 multiplier = 1024; 86 break; 87 88 case 'm': 89 multiplier = 1024 * 1024; 90 break; 91 92 case 'g': 93 multiplier = 1024 * 1024 * 1024; 94 break; 95 96 default: 97 errno = EINVAL; 98 return -1; /* Invalid suffix. */ 99 } 100 101 delimit = &str[len - 1]; 102 } else 103 delimit = NULL; 104 105 errno = 0; 106 tmp = strtoll(str, &ep, 10); 107 if (str[0] == '\0' || (ep != delimit && *ep != '\0')) { 108 errno = EINVAL; 109 return -1; /* Not a number. */ 110 } 111 else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) 112 return -1; /* Out of range. */ 113 114 tmp2 = tmp * multiplier; 115 tmp2 = tmp2 / multiplier; 116 if (tmp != tmp2) { 117 errno = ERANGE; 118 return -1; /* Out of range. */ 119 } 120 tmp *= multiplier; 121 #ifdef _DIAGASSERT 122 _DIAGASSERT(__type_fit(int64_t, tmp)); 123 #endif 124 *size = (int64_t)tmp; 125 126 return 0; 127 } 128