1 /* $NetBSD: strtonum.c,v 1.6 2018/12/06 06:29:56 kamil Exp $ */ 2 /*- 3 * Copyright (c) 2014 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Christos Zoulas. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: strtonum.c,v 1.6 2018/12/06 06:29:56 kamil Exp $"); 33 34 #include "namespace.h" 35 36 #define _OPENBSD_SOURCE 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <errno.h> 40 #include <inttypes.h> 41 42 long long 43 strtonum(const char *nptr, long long minval, long long maxval, 44 const char **errstr) 45 { 46 int e; 47 long long rv; 48 const char *resp; 49 50 if (errstr == NULL) 51 errstr = &resp; 52 53 if (minval > maxval) { 54 *errstr = "invalid"; 55 return 0; 56 } 57 58 rv = (long long)strtoi(nptr, NULL, 10, minval, maxval, &e); 59 60 if (e == 0) { 61 *errstr = NULL; 62 return rv; 63 } 64 65 if (e == ERANGE) 66 *errstr = (rv == maxval ? "too large" : "too small"); 67 else 68 *errstr = "invalid"; 69 70 return 0; 71 } 72