external/bsd/libbind/dist/nameser/ns_ttl.c

   1 /*      $NetBSD$        */
   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 #ifndef lint
  21 static const char rcsid[] = "Id: ns_ttl.c,v 1.4 2005/07/28 06:51:49 marka Exp";
  22 #endif
  23
  24 /* Import. */
  25
  26 #include "port_before.h"
  27
  28 #include <arpa/nameser.h>
  29
  30 #include <ctype.h>
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34
  35 #include "port_after.h"
  36
  37 #ifdef SPRINTF_CHAR
  38 # define SPRINTF(x) strlen(sprintf/**/x)
  39 #else
  40 # define SPRINTF(x) ((size_t)sprintf x)
  41 #endif
  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); else (void)NULL
  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 = src % 60;   src /= 60;
  60         mins = src % 60;   src /= 60;
  61         hours = src % 24;  src /= 24;
  62         days = src % 7;    src /= 7;
  63         weeks = 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         return (dst - odst);
  96 }
  97
  98 int
  99 ns_parse_ttl(const char *src, u_long *dst) {
 100         u_long ttl, tmp;
 101         int ch, digits, dirty;
 102
 103         ttl = 0;
 104         tmp = 0;
 105         digits = 0;
 106         dirty = 0;
 107         while ((ch = *src++) != '\0') {
 108                 if (!isascii(ch) || !isprint(ch))
 109                         goto einval;
 110                 if (isdigit(ch)) {
 111                         tmp *= 10;
 112                         tmp += (ch - '0');
 113                         digits++;
 114                         continue;
 115                 }
 116                 if (digits == 0)
 117                         goto einval;
 118                 if (islower(ch))
 119                         ch = toupper(ch);
 120                 switch (ch) {
 121                 case 'W':  tmp *= 7;
 122                 case 'D':  tmp *= 24;
 123                 case 'H':  tmp *= 60;
 124                 case 'M':  tmp *= 60;
 125                 case 'S':  break;
 126                 default:   goto einval;
 127                 }
 128                 ttl += tmp;
 129                 tmp = 0;
 130                 digits = 0;
 131                 dirty = 1;
 132         }
 133         if (digits > 0) {
 134                 if (dirty)
 135                         goto einval;
 136                 else
 137                         ttl += tmp;
 138         } else if (!dirty)
 139                 goto einval;
 140         *dst = ttl;
 141         return (0);
 142
 143  einval:
 144         errno = EINVAL;
 145         return (-1);
 146 }
 147
 148 /* Private. */
 149
 150 static int
 151 fmt1(int t, char s, char **buf, size_t *buflen) {
 152         char tmp[50];
 153         size_t len;
 154
 155         len = SPRINTF((tmp, "%d%c", t, s));
 156         if (len + 1 > *buflen)
 157                 return (-1);
 158         strcpy(*buf, tmp);
 159         *buf += len;
 160         *buflen -= len;
 161         return (0);
 162 }
 163
 164 /*! \file */