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/* stream.c - open streams on pipes or files
Copyright 1988-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include <config.h>
#include "a2ps.h"
#include "stream.h"
#include "routines.h"
#include "message.h"
#include "quotearg.h"
#include <assert.h>
/* Open for reading. */
static inline struct stream *
_stream_ropen (const char * command, bool is_file)
{
struct stream * res = XMALLOC (struct stream);
res->is_file = is_file;
if (!res->is_file)
res->fp = xrpopen (command);
else
{
if (!IS_EMPTY (command))
res->fp = xrfopen (command);
else
res->fp = stdin;
}
return res;
}
/*
* Inline wrapper
*/
struct stream *
stream_ropen (const char * command, bool is_file)
{
return _stream_ropen (command, is_file);
}
/*
* Open for writing
*/
static inline struct stream *
_stream_wopen (const char * command, bool is_file,
enum backup_type backup_type)
{
struct stream * res = XMALLOC (struct stream);
res->is_file = is_file;
if (!res->is_file)
res->fp = xwpopen (command);
else
{
if (!IS_EMPTY (command))
res->fp = fopen_backup (command, backup_type);
else
res->fp = stdout;
}
return res;
}
/*
* Inline wrapper
*/
struct stream *
stream_wopen (const char * command, bool is_file)
{
return _stream_wopen (command, is_file, no_backups);
}
struct stream *
stream_wopen_backup (const char * command, bool is_file,
enum backup_type backup_type)
{
return _stream_wopen (command, is_file, backup_type);
}
/* Open a r or w stream depending in PERL_COMMAND. PERL_COMMAND can
be:
- `> file', open a w-stream on FILE, and backup is asked.
- `| cmd', open a w-pipe on CMD.
- `cmd |', open a r-pipe on CMD.
- otherwise, PERL_COMMAND is a file to read.
Once the decoding done, NAME points to the first char of the file
name.
*/
struct stream *
stream_perl_open_backup (const char * perl_command,
enum backup_type backup,
const char **name)
{
char * cp;
size_t len;
assert (perl_command);
message (msg_file,
(stderr, "perl-open (%s)\n", quotearg (perl_command)));
*name = perl_command + strspn (perl_command, "\t >|");
switch (*perl_command)
{
case '|':
return _stream_wopen (*name, false, no_backups);
case '>':
return _stream_wopen (*name, true, backup);
default:
/* Open for reading. */
len = strlen (perl_command);
switch (perl_command [len - 1])
{
case '|':
/* Read a pipe. */
cp = ALLOCA (char, len);
strncpy (cp, *name, len - 1);
return _stream_ropen (cp, false);
default:
/* Read a file. */
return _stream_ropen (*name, true);
}
}
}
/*
* Closes and frees.
*/
void
stream_close (struct stream * stream)
{
if (stream->is_file)
fclose (stream->fp);
else
pclose (stream->fp);
}
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