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/* Conversion of files between different charsets and surfaces.
Copyright © 1990-2018 Free Software Foundation, Inc.
Contributed by François Pinard <pinard@iro.umontreal.ca>, 1988.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 3 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the Recode Library; see the file `COPYING.LIB'.
If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "common.h"
#include "decsteps.h"
#define CR 13 /* carriage return */
#define LF 10 /* line feed */
#define OLD_EOF 26 /* oldish end of file */
static bool
transform_data_cr (RECODE_SUBTASK subtask)
{
bool strict = subtask->step->fallback_routine != recode_reversibility;
int character;
while (character = recode_get_byte (subtask), character != EOF)
switch (character)
{
case '\n':
recode_put_byte (CR, subtask);
break;
case CR:
if (!strict)
{
recode_put_byte ('\n', subtask);
break;
}
RETURN_IF_NOGO (RECODE_AMBIGUOUS_OUTPUT, subtask);
FALLTHROUGH;
default:
recode_put_byte (character, subtask);
}
SUBTASK_RETURN (subtask);
}
static bool
transform_cr_data (RECODE_SUBTASK subtask)
{
bool strict = subtask->step->fallback_routine != recode_reversibility;
int character;
while (character = recode_get_byte (subtask), character != EOF)
switch (character)
{
case CR:
recode_put_byte ('\n', subtask);
break;
case '\n':
if (!strict)
{
recode_put_byte (CR, subtask);
break;
}
RETURN_IF_NOGO (RECODE_AMBIGUOUS_OUTPUT, subtask);
FALLTHROUGH;
default:
recode_put_byte (character, subtask);
}
SUBTASK_RETURN (subtask);
}
static bool
transform_data_crlf (RECODE_SUBTASK subtask)
{
int character = recode_get_byte (subtask);
while (character != EOF)
switch (character)
{
case '\n':
recode_put_byte (CR, subtask);
recode_put_byte (LF, subtask);
character = recode_get_byte (subtask);
break;
case CR:
character = recode_get_byte (subtask);
if (character == LF)
RETURN_IF_NOGO (RECODE_AMBIGUOUS_OUTPUT, subtask);
recode_put_byte (CR, subtask);
break;
case OLD_EOF:
RETURN_IF_NOGO (RECODE_AMBIGUOUS_OUTPUT, subtask);
FALLTHROUGH;
default:
recode_put_byte (character, subtask);
character = recode_get_byte (subtask);
}
SUBTASK_RETURN (subtask);
}
static bool
transform_crlf_data (RECODE_SUBTASK subtask)
{
int character = recode_get_byte (subtask);
while (character != EOF)
switch (character)
{
case OLD_EOF:
RETURN_IF_NOGO (RECODE_NOT_CANONICAL, subtask);
SUBTASK_RETURN (subtask);
case CR:
character = recode_get_byte (subtask);
if (character == LF)
{
recode_put_byte ('\n', subtask);
character = recode_get_byte (subtask);
}
else
recode_put_byte (CR, subtask);
break;
case LF:
RETURN_IF_NOGO (RECODE_AMBIGUOUS_OUTPUT, subtask);
FALLTHROUGH;
default:
recode_put_byte (character, subtask);
character = recode_get_byte (subtask);
}
SUBTASK_RETURN (subtask);
}
bool
module_endline (RECODE_OUTER outer)
{
return
recode_declare_single (outer, "data", "CR",
outer->quality_byte_to_byte,
NULL, transform_data_cr)
&& recode_declare_single (outer, "CR", "data",
outer->quality_byte_to_byte,
NULL, transform_cr_data)
&& recode_declare_single (outer, "data", "CR-LF",
outer->quality_byte_to_variable,
NULL, transform_data_crlf)
&& recode_declare_single (outer, "CR-LF", "data",
outer->quality_variable_to_byte,
NULL, transform_crlf_data)
&& recode_declare_alias (outer, "cl", "CR-LF");
}
void
delmodule_endline (_GL_UNUSED RECODE_OUTER outer)
{
}
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