CertTool/cdsaUtils/timeStr.cpp

   1 #include "timeStr.h"
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <ctype.h>
   6
   7 /*
   8  * Given a string containing either a UTC-style or "generalized time"
   9  * time string, convert to a struct tm (in GMT/UTC). Returns nonzero on
  10  * error.
  11  */
  12 int appTimeStringToTm(
  13         const char                      *str,
  14         unsigned                        len,
  15         struct tm                       *tmp)
  16 {
  17         char            szTemp[5];
  18         unsigned        isUtc;
  19         unsigned        x;
  20         unsigned        i;
  21         char            *cp;
  22
  23         if((str == NULL) || (len == 0) || (tmp == NULL)) {
  24         return 1;
  25         }
  26
  27         /* tolerate NULL terminated or not */
  28         if(str[len - 1] == '\0') {
  29                 len--;
  30         }
  31         switch(len) {
  32                 case UTC_TIME_STRLEN:                   // 2-digit year, not Y2K compliant
  33                         isUtc = 1;
  34                         break;
  35                 case GENERALIZED_TIME_STRLEN:   // 4-digit year
  36                         isUtc = 0;
  37                         break;
  38                 default:                                                // unknown format
  39                         return 1;
  40         }
  41
  42         cp = (char *)str;
  43
  44         /* check that all characters except last are digits */
  45         for(i=0; i<(len - 1); i++) {
  46                 if ( !(isdigit(cp[i])) ) {
  47                         return 1;
  48                 }
  49         }
  50
  51         /* check last character is a 'Z' */
  52         if(cp[len - 1] != 'Z' ) {
  53                 return 1;
  54         }
  55
  56         /* YEAR */
  57         szTemp[0] = *cp++;
  58         szTemp[1] = *cp++;
  59         if(!isUtc) {
  60                 /* two more digits */
  61                 szTemp[2] = *cp++;
  62                 szTemp[3] = *cp++;
  63                 szTemp[4] = '\0';
  64         }
  65         else {
  66                 szTemp[2] = '\0';
  67         }
  68         x = atoi( szTemp );
  69         if(isUtc) {
  70                 /*
  71                  * 2-digit year.
  72                  *   0  <= year <  50 : assume century 21
  73                  *   50 <= year <  70 : illegal per PKIX
  74                  *   70 <  year <= 99 : assume century 20
  75                  */
  76                 if(x < 50) {
  77                         x += 2000;
  78                 }
  79                 else if(x < 70) {
  80                         return 1;
  81                 }
  82                 else {
  83                         /* century 20 */
  84                         x += 1900;
  85                 }
  86         }
  87         /* by definition - tm_year is year - 1900 */
  88         tmp->tm_year = x - 1900;
  89
  90         /* MONTH */
  91         szTemp[0] = *cp++;
  92         szTemp[1] = *cp++;
  93         szTemp[2] = '\0';
  94         x = atoi( szTemp );
  95         /* in the string, months are from 1 to 12 */
  96         if((x > 12) || (x <= 0)) {
  97         return 1;
  98         }
  99         /* in a tm, 0 to 11 */
 100         tmp->tm_mon = x - 1;
 101
 102         /* DAY */
 103         szTemp[0] = *cp++;
 104         szTemp[1] = *cp++;
 105         szTemp[2] = '\0';
 106         x = atoi( szTemp );
 107         /* 1..31 in both formats */
 108         if((x > 31) || (x <= 0)) {
 109                 return 1;
 110         }
 111         tmp->tm_mday = x;
 112
 113         /* HOUR */
 114         szTemp[0] = *cp++;
 115         szTemp[1] = *cp++;
 116         szTemp[2] = '\0';
 117         x = atoi( szTemp );
 118         if((x > 23) || (x < 0)) {
 119                 return 1;
 120         }
 121         tmp->tm_hour = x;
 122
 123         /* MINUTE */
 124         szTemp[0] = *cp++;
 125         szTemp[1] = *cp++;
 126         szTemp[2] = '\0';
 127         x = atoi( szTemp );
 128         if((x > 59) || (x < 0)) {
 129                 return 1;
 130         }
 131         tmp->tm_min = x;
 132
 133         /* SECOND */
 134         szTemp[0] = *cp++;
 135         szTemp[1] = *cp++;
 136         szTemp[2] = '\0';
 137         x = atoi( szTemp );
 138         if((x > 59) || (x < 0)) {
 139                 return 1;
 140         }
 141         tmp->tm_sec = x;
 142         return 0;
 143 }
 144