Guess the line-endings mode of a text buffer

gistfile1.c

typedef enum
{
  LINE_END_MODE_CR,
  LINE_END_MODE_LF,
  LINE_END_MODE_CRLF
}
LineEndMode;

LineEndMode guess_line_endings(const char* buffer, size_t size)
{
# define MAX_LINES 10
  size_t i;
  unsigned int cr, lf, crlf, max_mode;
  LineEndMode mode;

  cr = lf = crlf = 0;

  for (i = 0; i < size ; i++)
    {
      if (buffer[i] == 0x0a)
        {
          /* LF */
          lf++;
        }
      else if (buffer[i] == 0x0d)
        {
          if (i >= (size - 1))
            {
              /* Last char, CR */
              cr++;
            }
          else
          {
            if (buffer[i + 1] != 0x0a)
              {
                /* CR */
                cr++;
              }
            else
              {
                /* CRLF */
                crlf++;
              }
            i++;
          }
      }
      if ((lf + cr + crlf) > MAX_LINES)
        break;
    }

  /* Vote for the maximum */
  mode = LINE_END_MODE_LF;
  max_mode = lf;
  if (crlf > max_mode)
    {
      mode = LINE_END_MODE_CRLF;
      max_mode = crlf;
    }
  if (cr > max_mode)
    {
      mode = LINE_END_MODE_CR;
      max_mode = cr;
    }

  return mode;
# undef MAX_LINES
}