lib/libc/nameser/ns_ttl.c

   1 /*      $NetBSD: ns_ttl.c,v 1.7 2009/04/12 17:07:17 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 1.7 2009/04/12 17:07:17 christos Exp $");
  26 #endif
  27 #endif
  28
  29 /* Import. */
  30
  31 #include "port_before.h"
  32
  33 #include <arpa/nameser.h>
  34
  35 #include <ctype.h>
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39
  40 #include "port_after.h"
  41
  42 #ifdef SPRINTF_CHAR
  43 # define SPRINTF(x) strlen(sprintf/**/x)
  44 #else
  45 # define SPRINTF(x) ((size_t)sprintf x)
  46 #endif
  47
  48 /* Forward. */
  49
  50 static int      fmt1(int t, char s, char **buf, size_t *buflen);
  51
  52 /* Macros. */
  53
  54 #define T(x) if ((x) < 0) return (-1)
  55
  56 /* Public. */
  57
  58 int
  59 ns_format_ttl(u_long src, char *dst, size_t dstlen) {
  60         char *odst = dst;
  61         int secs, mins, hours, days, weeks, x;
  62         char *p;
  63
  64         secs = src % 60;   src /= 60;
  65         mins = src % 60;   src /= 60;
  66         hours = src % 24;  src /= 24;
  67         days = src % 7;    src /= 7;
  68         weeks = src;       src = 0;
  69
  70         x = 0;
  71         if (weeks) {
  72                 T(fmt1(weeks, 'W', &dst, &dstlen));
  73                 x++;
  74         }
  75         if (days) {
  76                 T(fmt1(days, 'D', &dst, &dstlen));
  77                 x++;
  78         }
  79         if (hours) {
  80                 T(fmt1(hours, 'H', &dst, &dstlen));
  81                 x++;
  82         }
  83         if (mins) {
  84                 T(fmt1(mins, 'M', &dst, &dstlen));
  85                 x++;
  86         }
  87         if (secs || !(weeks || days || hours || mins)) {
  88                 T(fmt1(secs, 'S', &dst, &dstlen));
  89                 x++;
  90         }
  91
  92         if (x > 1) {
  93                 int ch;
  94
  95                 for (p = odst; (ch = *p) != '\0'; p++)
  96                         if (isascii(ch) && isupper(ch))
  97                                 *p = tolower(ch);
  98         }
  99
 100         return (dst - odst);
 101 }
 102
 103 #ifndef _LIBC
 104 int
 105 ns_parse_ttl(const char *src, u_long *dst) {
 106         u_long ttl, tmp;
 107         int ch, digits, dirty;
 108
 109         ttl = 0;
 110         tmp = 0;
 111         digits = 0;
 112         dirty = 0;
 113         while ((ch = *src++) != '\0') {
 114                 if (!isascii(ch) || !isprint(ch))
 115                         goto einval;
 116                 if (isdigit(ch)) {
 117                         tmp *= 10;
 118                         tmp += (ch - '0');
 119                         digits++;
 120                         continue;
 121                 }
 122                 if (digits == 0)
 123                         goto einval;
 124                 if (islower(ch))
 125                         ch = toupper(ch);
 126                 switch (ch) {
 127                 case 'W':  tmp *= 7;    /*FALLTHROUGH*/
 128                 case 'D':  tmp *= 24;   /*FALLTHROUGH*/
 129                 case 'H':  tmp *= 60;   /*FALLTHROUGH*/
 130                 case 'M':  tmp *= 60;   /*FALLTHROUGH*/
 131                 case 'S':  break;
 132                 default:   goto einval;
 133                 }
 134                 ttl += tmp;
 135                 tmp = 0;
 136                 digits = 0;
 137                 dirty = 1;
 138         }
 139         if (digits > 0) {
 140                 if (dirty)
 141                         goto einval;
 142                 else
 143                         ttl += tmp;
 144         } else if (!dirty)
 145                 goto einval;
 146         *dst = ttl;
 147         return (0);
 148
 149  einval:
 150         errno = EINVAL;
 151         return (-1);
 152 }
 153 #endif
 154
 155 /* Private. */
 156
 157 static int
 158 fmt1(int t, char s, char **buf, size_t *buflen) {
 159         char tmp[50];
 160         size_t len;
 161
 162         len = SPRINTF((tmp, "%d%c", t, s));
 163         if (len + 1 > *buflen)
 164                 return (-1);
 165         strcpy(*buf, tmp);
 166         *buf += len;
 167         *buflen -= len;
 168         return (0);
 169 }
 170
 171 /*! \file */