[GRASS-dev] [GRASS GIS] #3155: inconsistent newlines handling on Windows

[GRASS GIS]

#3155: inconsistent newlines handling on Windows
-------------------------+-------------------------
 Reporter:  annakrat     |      Owner:  grass-dev@…
     Type:  defect       |     Status:  new
 Priority:  normal       |  Milestone:  7.2.0
Component:  LibVector    |    Version:  svn-trunk
 Keywords:  newline      |        CPU:  Unspecified
 Platform:  MSWindows 8  |
-------------------------+-------------------------
 Function [https://grass.osgeo.org/programming7/ascii_8c_source.html#l00336
 Vect_write_ascii] uses:

 {{{
 fprintf(ascii, "%s", HOST_NEWLINE);
 }}}
 where HOST_NEWLINE is defined as '\r\n' on Windows.
 Other modules like v.info use:

 {{{
 fprintf(stdout, "north=%s\n", tmp1);
 }}}

 This is problem when you process the output in Python:

 {{{
 >>> output_points = grass.read_command("v.out.ascii", input='hospitals',
 format="point", separator=",").strip()
 >>> repr(output_points)
 '697237.5638615,182012.65540056,1\r\r\n704563.1878615,183568.90640056,2\r\r\n371094.1568615,274897.21940056,3\r\r\n640607.6248615,224673.12440056,4\r\r\n640952.4998615,224309.56340056,5\r\r\n670385.0618615,229717.53040056,6\r\r\n643879.5628615,230462.43740056,7\r\r\n636274.0638615,229165.37540056,8\r\r\n627390.7508615,202760.56240056,9\r\r\n646823.5628615,226063.35940056,10\r\r\n206065.7348615,195917.60840056,11\r\r\n444744.4678615,280199.56340056,12\r\r\n501025.1878615,179551.84440056,13\r\r\n566335.3748615,111190.14840056,14\r\r\n566327.6258615,111195.04740056,15\r\r\n671357.9988615,139627.76540056,16...
 }}}

 but:

 {{{
 x= grass.read_command('v.info', map='hospitals', flags='g')
 repr(x)
 'north=308097.937400562\r\nsouth=20235.5644005626\r\neast=914347.8748615\r\nwest=156998.1718615\r\ntop=0.000000\r\nbottom=0.000000\r\n'
 }}}

 so you have '\r\r\n' instead of '\r\n' which results in problems:

 {{{
 >>> output_points.splitlines()
 ['640607.6248615,224673.12440056,4', '',
 '640952.4998615,224309.56340056,5', ' ', ...]

 }}}

 Should we stop using 'HOST_NEWLINE' then?

--
Ticket URL: <https://trac.osgeo.org/grass/ticket/3155>
GRASS GIS <https://grass.osgeo.org>