cmpt.c

Wget很好的处理了http和ftp的下载,很值得学习的经典代码

            return NULL;
          break;
        case 's':
          {
            /* The number of seconds may be very high so we cannot use
               the `get_number' macro.  Instead read the number
               character for character and construct the result while
               doing this.  */
            time_t secs = 0;
            if (*rp < '0' || *rp > '9')
              /* We need at least one digit.  */
              return NULL;

            do
              {
                secs *= 10;
                secs += *rp++ - '0';
              }
            while (*rp >= '0' && *rp <= '9');

            if (localtime_r (&secs, tm) == NULL)
              /* Error in function.  */
              return NULL;
          }
          break;
        case 'S':
          get_number (0, 61, 2);
          tm->tm_sec = val;
          break;
        case 'X':
#ifdef _NL_CURRENT
          if (*decided != raw)
            {
              if (!recursive (_NL_CURRENT (LC_TIME, T_FMT)))
                {
                  if (*decided == loc)
                    return NULL;
                  else
                    rp = rp_backup;
                }
              else
                {
                  if (strcmp (_NL_CURRENT (LC_TIME, T_FMT), HERE_T_FMT))
                    *decided = loc;
                  break;
                }
              *decided = raw;
            }
#endif
          /* Fall through.  */
        case 'T':
          if (!recursive (HERE_T_FMT))
            return NULL;
          break;
        case 'u':
          get_number (1, 7, 1);
          tm->tm_wday = val % 7;
          have_wday = 1;
          break;
        case 'g':
          get_number (0, 99, 2);
          /* XXX This cannot determine any field in TM.  */
          break;
        case 'G':
          if (*rp < '0' || *rp > '9')
            return NULL;
          /* XXX Ignore the number since we would need some more
             information to compute a real date.  */
          do
            ++rp;
          while (*rp >= '0' && *rp <= '9');
          break;
        case 'U':
        case 'V':
        case 'W':
          get_number (0, 53, 2);
          /* XXX This cannot determine any field in TM without some
             information.  */
          break;
        case 'w':
          /* Match number of weekday.  */
          get_number (0, 6, 1);
          tm->tm_wday = val;
          have_wday = 1;
          break;
        case 'y':
          /* Match year within century.  */
          get_number (0, 99, 2);
          /* The "Year 2000: The Millennium Rollover" paper suggests that
             values in the range 69-99 refer to the twentieth century.  */
          tm->tm_year = val >= 69 ? val : val + 100;
          /* Indicate that we want to use the century, if specified.  */
          want_century = 1;
          want_xday = 1;
          break;
        case 'Y':
          /* Match year including century number.  */
          get_number (0, 9999, 4);
          tm->tm_year = val - 1900;
          want_century = 0;
          want_xday = 1;
          break;
        case 'Z':
          /* XXX How to handle this?  */
          break;
        case 'E':
#ifdef _NL_CURRENT
          switch (*fmt++)
            {
            case 'c':
              /* Match locale's alternate date and time format.  */
              if (*decided != raw)
                {
                  const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT);

                  if (*fmt == '\0')
                    fmt = _NL_CURRENT (LC_TIME, D_T_FMT);

                  if (!recursive (fmt))
                    {
                      if (*decided == loc)
                        return NULL;
                      else
                        rp = rp_backup;
                    }
                  else
                    {
                      if (strcmp (fmt, HERE_D_T_FMT))
                        *decided = loc;
                      want_xday = 1;
                      break;
                    }
                  *decided = raw;
                }
              /* The C locale has no era information, so use the
                 normal representation.  */
              if (!recursive (HERE_D_T_FMT))
                return NULL;
              want_xday = 1;
              break;
            case 'C':
            case 'y':
            case 'Y':
              /* Match name of base year in locale's alternate
                 representation.  */
              /* XXX This is currently not implemented.  It should
                 use the value _NL_CURRENT (LC_TIME, ERA).  */
              break;
            case 'x':
              if (*decided != raw)
                {
                  const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_FMT);

                  if (*fmt == '\0')
                    fmt = _NL_CURRENT (LC_TIME, D_FMT);

                  if (!recursive (fmt))
                    {
                      if (*decided == loc)
                        return NULL;
                      else
                        rp = rp_backup;
                    }
                  else
                    {
                      if (strcmp (fmt, HERE_D_FMT))
                        *decided = loc;
                      break;
                    }
                  *decided = raw;
                }
              if (!recursive (HERE_D_FMT))
                return NULL;
              break;
            case 'X':
              if (*decided != raw)
                {
                  const char *fmt = _NL_CURRENT (LC_TIME, ERA_T_FMT);

                  if (*fmt == '\0')
                    fmt = _NL_CURRENT (LC_TIME, T_FMT);

                  if (!recursive (fmt))
                    {
                      if (*decided == loc)
                        return NULL;
                      else
                        rp = rp_backup;
                    }
                  else
                    {
                      if (strcmp (fmt, HERE_T_FMT))
                        *decided = loc;
                      break;
                    }
                  *decided = raw;
                }
              if (!recursive (HERE_T_FMT))
                return NULL;
              break;
            default:
              return NULL;
            }
          break;
#else
          /* We have no information about the era format.  Just use
             the normal format.  */
          if (*fmt != 'c' && *fmt != 'C' && *fmt != 'y' && *fmt != 'Y'
              && *fmt != 'x' && *fmt != 'X')
            /* This is an illegal format.  */
            return NULL;

          goto start_over;
#endif
        case 'O':
          switch (*fmt++)
            {
            case 'd':
            case 'e':
              /* Match day of month using alternate numeric symbols.  */
              get_alt_number (1, 31, 2);
              tm->tm_mday = val;
              have_mday = 1;
              want_xday = 1;
              break;
            case 'H':
              /* Match hour in 24-hour clock using alternate numeric
                 symbols.  */
              get_alt_number (0, 23, 2);
              tm->tm_hour = val;
              have_I = 0;
              break;
            case 'I':
              /* Match hour in 12-hour clock using alternate numeric
                 symbols.  */
              get_alt_number (1, 12, 2);
              tm->tm_hour = val - 1;
              have_I = 1;
              break;
            case 'm':
              /* Match month using alternate numeric symbols.  */
              get_alt_number (1, 12, 2);
              tm->tm_mon = val - 1;
              have_mon = 1;
              want_xday = 1;
              break;
            case 'M':
              /* Match minutes using alternate numeric symbols.  */
              get_alt_number (0, 59, 2);
              tm->tm_min = val;
              break;
            case 'S':
              /* Match seconds using alternate numeric symbols.  */
              get_alt_number (0, 61, 2);
              tm->tm_sec = val;
              break;
            case 'U':
            case 'V':
            case 'W':
              get_alt_number (0, 53, 2);
              /* XXX This cannot determine any field in TM without
                 further information.  */
              break;
            case 'w':
              /* Match number of weekday using alternate numeric symbols.  */
              get_alt_number (0, 6, 1);
              tm->tm_wday = val;
              have_wday = 1;
              break;
            case 'y':
              /* Match year within century using alternate numeric symbols.  */
              get_alt_number (0, 99, 2);
              tm->tm_year = val >= 69 ? val : val + 100;
              want_xday = 1;
              break;
            default:
              return NULL;
            }
          break;
        default:
          return NULL;
        }
    }

  if (have_I && is_pm)
    tm->tm_hour += 12;

  if (century != -1)
    {
      if (want_century)
        tm->tm_year = tm->tm_year % 100 + (century - 19) * 100;
      else
        /* Only the century, but not the year.  Strange, but so be it.  */
        tm->tm_year = (century - 19) * 100;
    }

  if (want_xday && !have_wday) {
      if ( !(have_mon && have_mday) && have_yday)  {
          /* we don't have tm_mon and/or tm_mday, compute them */
          int t_mon = 0;
          while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon] <= tm->tm_yday)
              t_mon++;
          if (!have_mon)
              tm->tm_mon = t_mon - 1;
          if (!have_mday)
              tm->tm_mday = tm->tm_yday - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1;
      }
      day_of_the_week (tm);
  }
  if (want_xday && !have_yday)
    day_of_the_year (tm);

  return (char *) rp;
}


char *
strptime (buf, format, tm)
     const char *buf;
     const char *format;
     struct tm *tm;
{
  enum locale_status decided;
#ifdef _NL_CURRENT
  decided = not;
#else
  decided = raw;
#endif
  return strptime_internal (buf, format, tm, &decided);
}
#endif /* not HAVE_STRPTIME */

#ifdef NEED_MON_YDAY
const unsigned short int __mon_yday[2][13] =
  {
    /* Normal years.  */
    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
    /* Leap years.  */
    { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
  };
#endif

/* fnmatch is required by POSIX, but we include an implementation for
   the sake of systems that don't have it, most notably Windows.  Some
   systems do have fnmatch, but Apache's installation process installs
   its own fnmatch.h (incompatible with the system one!) in a system
   include directory, effectively rendering fnmatch unusable.  This
   has been fixed with Apache 2, where fnmatch has been moved to apr
   and given a prefix, but many systems out there are still (as of
   this writing in 2005) broken and we must cater to them.

   Additionally, according to some conventional wisdom, many
   historical implementations of fnmatch are buggy and unreliable.  If
   yours is such, undefine SYSTEM_FNMATCH in sysdep.h and tell us
   about it.  */

#ifndef SYSTEM_FNMATCH