exceptions.cpp revision 275988 
1// Copyright (c) 2007 The NetBSD Foundation, Inc.
2// All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions
6// are met:
7// 1. Redistributions of source code must retain the above copyright
8//    notice, this list of conditions and the following disclaimer.
9// 2. Redistributions in binary form must reproduce the above copyright
10//    notice, this list of conditions and the following disclaimer in the
11//    documentation and/or other materials provided with the distribution.
12//
13// THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
14// CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
15// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17// IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
18// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
20// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
22// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
24// IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25
26#include "atf-c++/detail/exceptions.hpp"
27
28#if defined(HAVE_CONFIG_H)
29#include "config.h"
30#endif
31
32#include <cstdarg>
33#include <cstdio>
34#include <cstring>
35#include <new>
36
37extern "C" {
38#include "atf-c/error.h"
39}
40
41#include "atf-c++/detail/sanity.hpp"
42
43// ------------------------------------------------------------------------
44// The "system_error" type.
45// ------------------------------------------------------------------------
46
47atf::system_error::system_error(const std::string& who,
48                                const std::string& message,
49                                int sys_err) :
50    std::runtime_error(who + ": " + message),
51    m_sys_err(sys_err)
52{
53}
54
55atf::system_error::~system_error(void)
56    throw()
57{
58}
59
60int
61atf::system_error::code(void)
62    const
63    throw()
64{
65    return m_sys_err;
66}
67
68const char*
69atf::system_error::what(void)
70    const
71    throw()
72{
73    try {
74        if (m_message.length() == 0) {
75            m_message = std::string(std::runtime_error::what()) + ": ";
76            m_message += ::strerror(m_sys_err);
77        }
78
79        return m_message.c_str();
80    } catch (...) {
81        return "Unable to format system_error message";
82    }
83}
84
85// ------------------------------------------------------------------------
86// Free functions.
87// ------------------------------------------------------------------------
88
89static
90void
91throw_libc_error(atf_error_t err)
92{
93    PRE(atf_error_is(err, "libc"));
94
95    const int ecode = atf_libc_error_code(err);
96    const std::string msg = atf_libc_error_msg(err);
97    atf_error_free(err);
98    throw atf::system_error("XXX", msg, ecode);
99}
100
101static
102void
103throw_no_memory_error(atf_error_t err)
104{
105    PRE(atf_error_is(err, "no_memory"));
106
107    atf_error_free(err);
108    throw std::bad_alloc();
109}
110
111static
112void
113throw_unknown_error(atf_error_t err)
114{
115    PRE(atf_is_error(err));
116
117    static char buf[4096];
118    atf_error_format(err, buf, sizeof(buf));
119    atf_error_free(err);
120    throw std::runtime_error(buf);
121}
122
123void
124atf::throw_atf_error(atf_error_t err)
125{
126    static struct handler {
127        const char* m_name;
128        void (*m_func)(atf_error_t);
129    } handlers[] = {
130        { "libc", throw_libc_error },
131        { "no_memory", throw_no_memory_error },
132        { NULL, throw_unknown_error },
133    };
134
135    PRE(atf_is_error(err));
136
137    handler* h = handlers;
138    while (h->m_name != NULL) {
139        if (atf_error_is(err, h->m_name)) {
140            h->m_func(err);
141            UNREACHABLE;
142        } else
143            h++;
144    }
145    // XXX: I'm not sure that raising an "unknown" error is a wise thing
146    // to do here.  The C++ binding is supposed to have feature parity
147    // with the C one, so all possible errors raised by the C library
148    // should have their counterpart in the C++ library.  Still, removing
149    // this will require some code auditing that I can't afford at the
150    // moment.
151    INV(h->m_name == NULL && h->m_func != NULL);
152    h->m_func(err);
153    UNREACHABLE;
154}
155