L4Re Operating System Framework
Interface and Usage Documentation
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ipc_string
1// vi:set ft=cpp: -*- Mode: C++ -*-
2/*
3 * (c) 2014 Alexander Warg <alexander.warg@kernkonzept.com>
4 *
5 * This file is part of TUD:OS and distributed under the terms of the
6 * GNU General Public License 2.
7 * Please see the COPYING-GPL-2 file for details.
8 *
9 * As a special exception, you may use this file as part of a free software
10 * library without restriction. Specifically, if other files instantiate
11 * templates or use macros or inline functions from this file, or you compile
12 * this file and link it with other files to produce an executable, this
13 * file does not by itself cause the resulting executable to be covered by
14 * the GNU General Public License. This exception does not however
15 * invalidate any other reasons why the executable file might be covered by
16 * the GNU General Public License.
17 */
18#pragma once
19
20#include "types"
21#include "ipc_basics"
22#include "ipc_array"
23
24namespace L4 { namespace Ipc {
25
26template<typename CHAR = char const, typename LEN = unsigned long>
27struct String : Array<CHAR, LEN>
28{
29 static LEN strlength(CHAR *d) { LEN l = 0; while (d[l]) ++l; return l; }
30 String() {}
31 String(CHAR *d) : Array<CHAR, LEN>(strlength(d) + 1, d) {}
32 String(LEN len, CHAR *d) : Array<CHAR, LEN>(len, d) {}
33 void copy_in(CHAR const *s)
34 {
35 if (this->length < 1)
36 return;
37
38 LEN i;
39 for (i = 0; i < this->length - 1 && s[i]; ++i)
40 this->data[i] = s[i];
41 this->length = i + 1;
42 this->data[i] = CHAR();
43 }
44};
45
46#if __cplusplus >= 201103L
47template< typename CHAR = char, typename LEN_TYPE = unsigned long,
48 LEN_TYPE MAX = (L4_UTCB_GENERIC_DATA_SIZE *
49 sizeof(l4_umword_t)) / sizeof(CHAR) >
50using String_in_buf = Array_in_buf<CHAR, LEN_TYPE, MAX>;
51#endif
52
53namespace Msg {
54template<typename A, typename LEN>
55struct Clnt_xmit< String<A, LEN> > : Clnt_xmit< Array<A, LEN> > {};
56
57template<typename A, typename LEN, typename CLASS>
58struct Svr_val_ops< String<A, LEN>, Dir_in, CLASS >
59: Svr_val_ops< Array_ref<A, LEN>, Dir_in, CLASS >
60{
61 typedef Svr_val_ops< Array_ref<A, LEN>, Dir_in, CLASS > Base;
62 typedef typename Base::svr_type svr_type;
63 using Base::to_svr;
64 static int to_svr(char *msg, unsigned offset, unsigned limit,
65 svr_type &a, Dir_in dir, Cls_data cls)
66 {
67 int r = Base::to_svr(msg, offset, limit, a, dir, cls);
68 if (r < 0)
69 return r;
70
71 // correct clients send at least the zero terminator
72 if (a.length < 1)
73 return -L4_EMSGTOOSHORT;
74
75 typedef typename L4::Types::Remove_const<A>::type elem_type;
76 const_cast<elem_type*>(a.data)[a.length - 1] = A();
77 return r;
78 }
79};
80
81template<typename A, typename LEN>
82struct Clnt_xmit<String<A, LEN> &> : Clnt_xmit<Array<A, LEN> &>
83{
84 typedef Array<A, LEN> &type;
85
86 using Clnt_xmit<type>::from_msg;
87 static int from_msg(char *msg, unsigned offset, unsigned limit, long ret,
88 Array<A, LEN> &a, Dir_out dir, Cls_data cls)
89 {
90 int r = Clnt_xmit<type>::from_msg(msg, offset, limit, ret, a, dir, cls);
91 if (r < 0)
92 return r;
93
94 // check for a bad servers
95 if (a.length < 1)
96 return -L4_EMSGTOOSHORT;
97
98 a.data[a.length - 1] = A();
99 return r;
100 };
101};
102
103template<typename A, typename LEN>
104struct Clnt_xmit<String<A, LEN> *> : Clnt_xmit<String<A, LEN> &> {};
105
106template<typename A, typename LEN, typename CLASS>
107struct Svr_val_ops<String<A, LEN>, Dir_out, CLASS>
108: Svr_val_ops<Array_ref<A, LEN>, Dir_out, CLASS>
109{};
110
111template<typename A, typename LEN>
112struct Is_valid_rpc_type<String<A, LEN> const *> : L4::Types::False {};
113template<typename A, typename LEN>
114struct Is_valid_rpc_type<String<A, LEN> const &> : L4::Types::False {};
115
116} // namespace Msg
117
118}}
unsigned long l4_umword_t
Unsigned machine word.
Definition l4int.h:51
@ L4_EMSGTOOSHORT
Message too short.
Definition err.h:67
L4 low-level kernel interface.
Definition io_regblock.h:19
Array()
Make array.
Definition ipc_array:95
False meta value.
Definition types:307