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