external/ibm-public/postfix/dist/src/global/conv_time.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      conv_time 3
   6 /* SUMMARY
   7 /*      time value conversion
   8 /* SYNOPSIS
   9 /*      #include <conv_time.h>
  10 /*
  11 /*      int     conv_time(strval, timval, def_unit);
  12 /*      const char *strval;
  13 /*      int     *timval;
  14 /*      int     def_unit;
  15 /* DESCRIPTION
  16 /*      conv_time() converts a numerical time value with optional
  17 /*      one-letter suffix that specifies an explicit time unit: s
  18 /*      (seconds), m (minutes), h (hours), d (days) or w (weeks).
  19 /*      Internally, time is represented in seconds.
  20 /*
  21 /*      Arguments:
  22 /* .IP strval
  23 /*      Input value.
  24 /* .IP timval
  25 /*      Result pointer.
  26 /* .IP def_unit
  27 /*      The default time unit suffix character.
  28 /* DIAGNOSTICS
  29 /*      The result value is non-zero in case of success, zero in
  30 /*      case of a bad time value or a bad time unit suffix.
  31 /* LICENSE
  32 /* .ad
  33 /* .fi
  34 /*      The Secure Mailer license must be distributed with this software.
  35 /* AUTHOR(S)
  36 /*      Wietse Venema
  37 /*      IBM T.J. Watson Research
  38 /*      P.O. Box 704
  39 /*      Yorktown Heights, NY 10598, USA
  40 /*--*/
  41
  42 /* System library. */
  43
  44 #include <sys_defs.h>
  45 #include <limits.h>                     /* INT_MAX */
  46 #include <stdio.h>                      /* sscanf() */
  47
  48 /* Utility library. */
  49
  50 #include <msg.h>
  51
  52 /* Global library. */
  53
  54 #include <conv_time.h>
  55
  56 #define MINUTE  (60)
  57 #define HOUR    (60 * MINUTE)
  58 #define DAY     (24 * HOUR)
  59 #define WEEK    (7 * DAY)
  60
  61 /* conv_time - convert time value */
  62
  63 int     conv_time(const char *strval, int *timval, int def_unit)
  64 {
  65     char    unit;
  66     char    junk;
  67     int     intval;
  68
  69     switch (sscanf(strval, "%d%c%c", &intval, &unit, &junk)) {
  70     case 1:
  71         unit = def_unit;
  72         /* FALLTHROUGH */
  73     case 2:
  74         if (intval < 0)
  75             return (0);
  76         switch (unit) {
  77         case 'w':
  78             if (intval < INT_MAX / WEEK) {
  79                 *timval = intval * WEEK;
  80                 return (1);
  81             } else {
  82                 return (0);
  83             }
  84         case 'd':
  85             if (intval < INT_MAX / DAY) {
  86                 *timval = intval * DAY;
  87                 return (1);
  88             } else {
  89                 return (0);
  90             }
  91         case 'h':
  92             if (intval < INT_MAX / HOUR) {
  93                 *timval = intval * HOUR;
  94                 return (1);
  95             } else {
  96                 return (0);
  97             }
  98         case 'm':
  99             if (intval < INT_MAX / MINUTE) {
 100                 *timval = intval * MINUTE;
 101                 return (1);
 102             } else {
 103                 return (0);
 104             }
 105         case 's':
 106             *timval = intval;
 107             return (1);
 108         }
 109     }
 110     return (0);
 111 }