DBFIsValueNULL()

static int DBFIsValueNULL ( char  chType, const char *  pszValue  )

static

Definition at line 1115 of file dbfopen.c.

References FALSE, SHPAPI_CALL, and TRUE.

Referenced by DBFAlterFieldDefn(), and DBFIsAttributeNULL().

{
    int i;

    if( pszValue == NULL )
        return TRUE;

    switch(chType)
    {
      case 'N':
      case 'F':
        /*
        ** We accept all asterisks or all blanks as NULL
        ** though according to the spec I think it should be all
        ** asterisks.
        */
        if( pszValue[0] == '*' )
            return TRUE;

        for( i = 0; pszValue[i] != '\0'; i++ )
        {
            if( pszValue[i] != ' ' )
                return FALSE;
        }
        return TRUE;

      case 'D':
        /* NULL date fields have value "00000000" or blank or empty */
        if (pszValue[0] == '\0' ||                  /* emtpy string */
            strncmp(pszValue,"00000000",8) == 0 ||
            strncmp(pszValue,"        ",8) == 0) {
            return 1;
        } else {
            return 0;
        }
        /* return strncmp(pszValue,"00000000",8) == 0; */

      case 'L':
        /* NULL boolean fields have value "?" or empty */
        if (pszValue[0] == '\0' || pszValue[0] == '?') {
                return 1;
        } else {
                return 0;
        }

      default:
        /* empty string fields are considered NULL */
        return strlen(pszValue) == 0;
    }
}

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