aos/build/queues/print_field.rb

require File.dirname(__FILE__) + '/load.rb'

# TODO(brians): Special-case Time too and float/double if we can find a good way to do it.
GenericTypeNames = ['float', 'double', 'char', '::aos::time::Time']
IntegerSizes = [8, 16, 32, 64]

WriteIffChanged.open(ARGV[0]) do |output|
  output.puts <<END
// This file is generated by #{File.expand_path(__FILE__)}.
// DO NOT EDIT BY HAND!

#include <sys/types.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>

#include "aos/common/byteorder.h"
#include "aos/common/time.h"
#include "aos/common/print_field_helpers.h"

namespace aos {

bool PrintField(char *output, size_t *output_bytes, const void *input,
                size_t *input_bytes, uint32_t type) {
  switch (type) {
#{GenericTypeNames.collect do |name|
  message_element = Target::MessageElement.new(name, 'value')
  statement = MessageElementStmt.new(name, 'value')
  message_element.size = statement.size
  print_args = []
  message_element.fetchPrintArgs(print_args)
  next <<END2
    case #{message_element.getTypeID()}:
      {
        if (*input_bytes < #{statement.size}) return false;
        *input_bytes -= #{statement.size};
        #{name} value;
        to_host(static_cast<const char *>(input), &value);
        int ret = snprintf(output, *output_bytes,
                           "#{statement.toPrintFormat()}",
                           #{print_args[0]});
        if (ret < 0) return false;
        if (static_cast<unsigned int>(ret) >= *output_bytes) return false;
        *output_bytes -= ret;
        return true;
      }
END2
end.join('')}
#{IntegerSizes.collect do |size|
  [true, false].collect do |signed|
    size_bytes = size / 8
    name = "#{signed ? '' : 'u'}int#{size}_t"
    message_element = Target::MessageElement.new(name, 'value')
    message_element.size = size_bytes
    next <<END2
    case #{message_element.getTypeID()}:
      {
        if (*input_bytes < #{size_bytes}) return false;
        *input_bytes -= #{size_bytes};
        #{name} value;
        to_host(static_cast<const char *>(input), &value);
        return PrintInteger<#{name}>(output, value, output_bytes);
      }
END2
  end
end.flatten.join('')}
#{
  message_element = Target::MessageElement.new('bool', 'value')
  message_element.size = 1
  r = <<END2
    case #{message_element.getTypeID()}:
      {
        if (*input_bytes < 1) return false;
        if (*output_bytes < 1) return false;
        *input_bytes -= 1;
        bool value = static_cast<const char *>(input)[0];
        *output_bytes += 1;
        *output = value ? 'T' : 'f';
        return true;
      }
END2
}
    default:
      return false;
  }
}

}  // namespace aos
END
end