1: /*
    2:  * Copyright (c) 1996,1999 by Internet Software Consortium.
    3:  *
    4:  * Permission to use, copy, modify, and distribute this software for any
    5:  * purpose with or without fee is hereby granted, provided that the above
    6:  * copyright notice and this permission notice appear in all copies.
    7:  *
    8:  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
    9:  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
   10:  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
   11:  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
   12:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
   13:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
   14:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
   15:  * SOFTWARE.
   16:  */
   17: 
   18: #if !defined(_LIBC) && !defined(lint)
   19: static const char rcsid[] = "$BINDId: ns_ttl.c,v 8.8 1999/10/13 16:39:36 vixie Exp $";
   20: #endif
   21: 
   22: /* Import. */
   23: 
   24: #include <arpa/nameser.h>
   25: 
   26: #include <ctype.h>
   27: #include <errno.h>
   28: #include <stdio.h>
   29: #include <string.h>
   30: 
   31: #ifdef SPRINTF_CHAR
   32: # define SPRINTF(x) strlen(sprintf/**/x)
   33: #else
   34: # define SPRINTF(x) ((size_t)sprintf x)
   35: #endif
   36: 
   37: /* Forward. */
   38: 
   39: static int      fmt1(int t, char s, char **buf, size_t *buflen);
   40: 
   41: /* Macros. */
   42: 
   43: #define T(x) if ((x) < 0) return (-1); else (void)NULL
   44: 
   45: /* Public. */
   46: 
   47: int
   48: ns_format_ttl(u_long src, char *dst, size_t dstlen) {
   49:         char *odst = dst;
   50:         int secs, mins, hours, days, weeks, x;
   51:         char *p;
   52: 
   53:         secs = src % 60;   src /= 60;
   54:         mins = src % 60;   src /= 60;
   55:         hours = src % 24;  src /= 24;
   56:         days = src % 7;    src /= 7;
   57:         weeks = src;       src = 0;
   58: 
   59:         x = 0;
   60:         if (weeks) {
   61:                 T(fmt1(weeks, 'W', &dst, &dstlen));
   62:                 x++;
   63:         }
   64:         if (days) {
   65:                 T(fmt1(days, 'D', &dst, &dstlen));
   66:                 x++;
   67:         }
   68:         if (hours) {
   69:                 T(fmt1(hours, 'H', &dst, &dstlen));
   70:                 x++;
   71:         }
   72:         if (mins) {
   73:                 T(fmt1(mins, 'M', &dst, &dstlen));
   74:                 x++;
   75:         }
   76:         if (secs || !(weeks || days || hours || mins)) {
   77:                 T(fmt1(secs, 'S', &dst, &dstlen));
   78:                 x++;
   79:         }
   80: 
   81:         if (x > 1) {
   82:                 int ch;
   83: 
   84:                 for (p = odst; (ch = *p) != '\0'; p++)
   85:                         if (isascii(ch) && isupper(ch))
   86:                                 *p = tolower(ch);
   87:         }
   88: 
   89:         return (dst - odst);
   90: }
   91: 
   92: #ifndef SHARED
   93: // Seems not to be needed.  It's not exported from the DSO.  Some libresolv.a
   94: // might depend on it so we let it in.
   95: int
   96: ns_parse_ttl(const char *src, u_long *dst) {
   97:         u_long ttl, tmp;
   98:         int ch, digits, dirty;
   99: 
  100:         ttl = 0;
  101:         tmp = 0;
  102:         digits = 0;
  103:         dirty = 0;
  104:         while ((ch = *src++) != '\0') {
  105:                 if (!isascii(ch) || !isprint(ch))
  106:                         goto einval;
  107:                 if (isdigit(ch)) {
  108:                         tmp *= 10;
  109:                         tmp += (ch - '0');
  110:                         digits++;
  111:                         continue;
  112:                 }
  113:                 if (digits == 0)
  114:                         goto einval;
  115:                 if (islower(ch))
  116:                         ch = toupper(ch);
  117:                 switch (ch) {
  118:                 case 'W':  tmp *= 7;
  119:                 case 'D':  tmp *= 24;
  120:                 case 'H':  tmp *= 60;
  121:                 case 'M':  tmp *= 60;
  122:                 case 'S':  break;
  123:                 default:   goto einval;
  124:                 }
  125:                 ttl += tmp;
  126:                 tmp = 0;
  127:                 digits = 0;
  128:                 dirty = 1;
  129:         }
  130:         if (digits > 0) {
  131:                 if (dirty)
  132:                         goto einval;
  133:                 else
  134:                         ttl += tmp;
  135:         }
  136:         *dst = ttl;
  137:         return (0);
  138: 
  139:  einval:
  140:         __set_errno (EINVAL);
  141:         return (-1);
  142: }
  143: #endif
  144: 
  145: /* Private. */
  146: 
  147: static int
  148: fmt1(int t, char s, char **buf, size_t *buflen) {
  149:         char tmp[50];
  150:         size_t len;
  151: 
  152:         len = SPRINTF((tmp, "%d%c", t, s));
  153:         if (len + 1 > *buflen)
  154:                 return (-1);
  155:         strcpy(*buf, tmp);
  156:         *buf += len;
  157:         *buflen -= len;
  158:         return (0);
  159: }