aboutsummaryrefslogtreecommitdiff
path: root/paludis/pstream.cc
blob: f5584de6561314207cc77a14286690874dcc8570 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/* vim: set sw=4 sts=4 et foldmethod=syntax : */

/*
 * Copyright (c) 2006 Ciaran McCreesh <ciaranm@gentoo.org>
 *
 * This file is part of the Paludis package manager. Paludis is free software;
 * you can redistribute it and/or modify it under the terms of the GNU General
 * Public License version 2, as published by the Free Software Foundation.
 *
 * Paludis 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., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "pstream.hh"
#include "log.hh"
#include <errno.h>
#include <cstring>

using namespace paludis;

PStreamError::PStreamError(const std::string & message) throw () :
    Exception(message)
{
}

PStreamInBuf::int_type
PStreamInBuf::underflow()
{
    if (0 == fd)
        return EOF;

    if (gptr() < egptr())
        return *gptr();

    int num_putback = gptr() - eback();
    if (num_putback > putback_size)
        num_putback = putback_size;
    std::memmove(buffer + putback_size - num_putback,
            gptr() - num_putback, num_putback);

    size_t n = fread(buffer + putback_size, 1, buffer_size - putback_size, fd);
    if (n <= 0)
        return EOF;

    setg(buffer + putback_size - num_putback, buffer + putback_size,
            buffer + putback_size + n);

    return *gptr();
}

PStreamInBuf::PStreamInBuf(const std::string & command) :
    _command(command),
    fd(popen(command.c_str(), "r"))
{
    Log::get_instance()->message(ll_debug, "popen " + command);

    if (0 == fd)
        throw PStreamError("popen('" + _command + "', 'r') failed: " +
                strerror(errno));

    setg(buffer + putback_size, buffer + putback_size, buffer + putback_size);
}

PStreamInBuf::~PStreamInBuf()
{
    if (0 != fd)
        pclose(fd);
}

int
PStreamInBuf::exit_status()
{
    if (0 != fd)
    {
        _exit_status = pclose(fd);
        fd = 0;
    }
    return _exit_status;
}