dehumanize_number.c revision 1.2.2.2
1 1.2.2.2 matt /* $NetBSD: dehumanize_number.c,v 1.2.2.2 2008/01/09 01:34:04 matt Exp $ */ 2 1.2.2.2 matt 3 1.2.2.2 matt /* 4 1.2.2.2 matt * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 1.2.2.2 matt * All rights reserved. 6 1.2.2.2 matt * 7 1.2.2.2 matt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 matt * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 1.2.2.2 matt * 2005 program. 10 1.2.2.2 matt * 11 1.2.2.2 matt * Redistribution and use in source and binary forms, with or without 12 1.2.2.2 matt * modification, are permitted provided that the following conditions 13 1.2.2.2 matt * are met: 14 1.2.2.2 matt * 1. Redistributions of source code must retain the above copyright 15 1.2.2.2 matt * notice, this list of conditions and the following disclaimer. 16 1.2.2.2 matt * 2. Redistributions in binary form must reproduce the above copyright 17 1.2.2.2 matt * notice, this list of conditions and the following disclaimer in the 18 1.2.2.2 matt * documentation and/or other materials provided with the distribution. 19 1.2.2.2 matt * 3. All advertising materials mentioning features or use of this software 20 1.2.2.2 matt * must display the following acknowledgement: 21 1.2.2.2 matt * This product includes software developed by the NetBSD 22 1.2.2.2 matt * Foundation, Inc. and its contributors. 23 1.2.2.2 matt * 4. Neither the name of The NetBSD Foundation nor the names of its 24 1.2.2.2 matt * contributors may be used to endorse or promote products derived 25 1.2.2.2 matt * from this software without specific prior written permission. 26 1.2.2.2 matt * 27 1.2.2.2 matt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 1.2.2.2 matt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 1.2.2.2 matt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 1.2.2.2 matt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 1.2.2.2 matt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 1.2.2.2 matt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 1.2.2.2 matt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 1.2.2.2 matt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 1.2.2.2 matt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 1.2.2.2 matt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 1.2.2.2 matt * POSSIBILITY OF SUCH DAMAGE. 38 1.2.2.2 matt */ 39 1.2.2.2 matt #include <sys/cdefs.h> 40 1.2.2.2 matt #if defined(LIBC_SCCS) && !defined(lint) 41 1.2.2.2 matt __RCSID("$NetBSD: dehumanize_number.c,v 1.2.2.2 2008/01/09 01:34:04 matt Exp $"); 42 1.2.2.2 matt #endif /* LIBC_SCCS and not lint */ 43 1.2.2.2 matt 44 1.2.2.2 matt #include "namespace.h" 45 1.2.2.2 matt #include <inttypes.h> 46 1.2.2.2 matt #include <ctype.h> 47 1.2.2.2 matt #include <stdlib.h> 48 1.2.2.2 matt #include <string.h> 49 1.2.2.2 matt #include <errno.h> 50 1.2.2.2 matt #include <limits.h> 51 1.2.2.2 matt 52 1.2.2.2 matt /* 53 1.2.2.2 matt * Converts the number given in 'str', which may be given in a humanized 54 1.2.2.2 matt * form (as described in humanize_number(3), but with some limitations), 55 1.2.2.2 matt * to an int64_t without units. 56 1.2.2.2 matt * In case of success, 0 is returned and *size holds the value. 57 1.2.2.2 matt * Otherwise, -1 is returned and *size is untouched. 58 1.2.2.2 matt * 59 1.2.2.2 matt * TODO: Internationalization, SI units. 60 1.2.2.2 matt */ 61 1.2.2.2 matt int 62 1.2.2.2 matt dehumanize_number(const char *str, int64_t *size) 63 1.2.2.2 matt { 64 1.2.2.2 matt char *ep, unit; 65 1.2.2.2 matt const char *delimit; 66 1.2.2.2 matt long multiplier; 67 1.2.2.2 matt long long tmp, tmp2; 68 1.2.2.2 matt size_t len; 69 1.2.2.2 matt 70 1.2.2.2 matt len = strlen(str); 71 1.2.2.2 matt if (len == 0) { 72 1.2.2.2 matt errno = EINVAL; 73 1.2.2.2 matt return -1; 74 1.2.2.2 matt } 75 1.2.2.2 matt 76 1.2.2.2 matt multiplier = 1; 77 1.2.2.2 matt 78 1.2.2.2 matt unit = str[len - 1]; 79 1.2.2.2 matt if (isalpha((unsigned char)unit)) { 80 1.2.2.2 matt switch (tolower((unsigned char)unit)) { 81 1.2.2.2 matt case 'b': 82 1.2.2.2 matt multiplier = 1; 83 1.2.2.2 matt break; 84 1.2.2.2 matt 85 1.2.2.2 matt case 'k': 86 1.2.2.2 matt multiplier = 1024; 87 1.2.2.2 matt break; 88 1.2.2.2 matt 89 1.2.2.2 matt case 'm': 90 1.2.2.2 matt multiplier = 1024 * 1024; 91 1.2.2.2 matt break; 92 1.2.2.2 matt 93 1.2.2.2 matt case 'g': 94 1.2.2.2 matt multiplier = 1024 * 1024 * 1024; 95 1.2.2.2 matt break; 96 1.2.2.2 matt 97 1.2.2.2 matt default: 98 1.2.2.2 matt errno = EINVAL; 99 1.2.2.2 matt return -1; /* Invalid suffix. */ 100 1.2.2.2 matt } 101 1.2.2.2 matt 102 1.2.2.2 matt delimit = &str[len - 1]; 103 1.2.2.2 matt } else 104 1.2.2.2 matt delimit = NULL; 105 1.2.2.2 matt 106 1.2.2.2 matt errno = 0; 107 1.2.2.2 matt tmp = strtoll(str, &ep, 10); 108 1.2.2.2 matt if (str[0] == '\0' || (ep != delimit && *ep != '\0')) 109 1.2.2.2 matt return -1; /* Not a number. */ 110 1.2.2.2 matt else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN)) 111 1.2.2.2 matt return -1; /* Out of range. */ 112 1.2.2.2 matt 113 1.2.2.2 matt tmp2 = tmp * multiplier; 114 1.2.2.2 matt tmp2 = tmp2 / multiplier; 115 1.2.2.2 matt if (tmp != tmp2) { 116 1.2.2.2 matt errno = ERANGE; 117 1.2.2.2 matt return -1; /* Out of range. */ 118 1.2.2.2 matt } 119 1.2.2.2 matt *size = tmp * multiplier; 120 1.2.2.2 matt 121 1.2.2.2 matt return 0; 122 1.2.2.2 matt } 123
Indexes created Wed Oct 01 07:09:59 GMT 2025