1 /* $NetBSD: ns_ttl.c,v 1.9 2026/04/08 14:12:06 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1996,1999 by Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/cdefs.h> 21 #ifndef lint 22 #ifdef notdef 23 static const char rcsid[] = "Id: ns_ttl.c,v 1.4 2005/07/28 06:51:49 marka Exp"; 24 #else 25 __RCSID("$NetBSD: ns_ttl.c,v 1.9 2026/04/08 14:12:06 christos Exp $"); 26 #endif 27 #endif 28 29 /* Import. */ 30 31 #include "port_before.h" 32 33 #include <arpa/nameser.h> 34 35 #include <assert.h> 36 #include <ctype.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <string.h> 40 41 #include "port_after.h" 42 43 /* Forward. */ 44 45 static int fmt1(int t, char s, char **buf, size_t *buflen); 46 47 /* Macros. */ 48 49 #define T(x) if ((x) < 0) return (-1) 50 51 /* Public. */ 52 53 int 54 ns_format_ttl(u_long src, char *dst, size_t dstlen) { 55 char *odst = dst; 56 int secs, mins, hours, days, weeks, x; 57 char *p; 58 59 secs = (int)(src % 60); src /= 60; 60 mins = (int)(src % 60); src /= 60; 61 hours = (int)(src % 24); src /= 24; 62 days = (int)(src % 7); src /= 7; 63 weeks = (int)src; src = 0; 64 65 x = 0; 66 if (weeks) { 67 T(fmt1(weeks, 'W', &dst, &dstlen)); 68 x++; 69 } 70 if (days) { 71 T(fmt1(days, 'D', &dst, &dstlen)); 72 x++; 73 } 74 if (hours) { 75 T(fmt1(hours, 'H', &dst, &dstlen)); 76 x++; 77 } 78 if (mins) { 79 T(fmt1(mins, 'M', &dst, &dstlen)); 80 x++; 81 } 82 if (secs || !(weeks || days || hours || mins)) { 83 T(fmt1(secs, 'S', &dst, &dstlen)); 84 x++; 85 } 86 87 if (x > 1) { 88 int ch; 89 90 for (p = odst; (ch = *p) != '\0'; p++) 91 if (isascii(ch) && isupper(ch)) 92 *p = tolower(ch); 93 } 94 95 _DIAGASSERT(__type_fit(int, dst - odst)); 96 return (int)(dst - odst); 97 } 98 99 #ifndef _LIBC 100 int 101 ns_parse_ttl(const char *src, u_long *dst) { 102 u_long ttl, tmp; 103 int ch, digits, dirty; 104 105 ttl = 0; 106 tmp = 0; 107 digits = 0; 108 dirty = 0; 109 while ((ch = *src++) != '\0') { 110 if (!isascii(ch) || !isprint(ch)) 111 goto einval; 112 if (isdigit(ch)) { 113 tmp *= 10; 114 tmp += (ch - '0'); 115 digits++; 116 continue; 117 } 118 if (digits == 0) 119 goto einval; 120 if (islower(ch)) 121 ch = toupper(ch); 122 switch (ch) { 123 case 'W': tmp *= 7; /*FALLTHROUGH*/ 124 case 'D': tmp *= 24; /*FALLTHROUGH*/ 125 case 'H': tmp *= 60; /*FALLTHROUGH*/ 126 case 'M': tmp *= 60; /*FALLTHROUGH*/ 127 case 'S': break; 128 default: goto einval; 129 } 130 ttl += tmp; 131 tmp = 0; 132 digits = 0; 133 dirty = 1; 134 } 135 if (digits > 0) { 136 if (dirty) 137 goto einval; 138 else 139 ttl += tmp; 140 } else if (!dirty) 141 goto einval; 142 *dst = ttl; 143 return (0); 144 145 einval: 146 errno = EINVAL; 147 return (-1); 148 } 149 #endif 150 151 /* Private. */ 152 153 static int 154 fmt1(int t, char s, char **buf, size_t *buflen) { 155 char tmp[50]; 156 int len; 157 158 len = snprintf(tmp, sizeof(tmp), "%d%c", t, s); 159 if (len == -1 || (size_t)(len + 1) > *buflen) 160 return (-1); 161 strcpy(*buf, tmp); 162 *buf += len; 163 *buflen -= len; 164 return (0); 165 } 166 167 /*! \file */ 168