1 /* c_streambuf class implementation (non-inline functions).
2 Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
3 Copyright (C) 2010-2016 BUGSENG srl (http://bugseng.com)
4
5 This file is part of the Parma Polyhedra Library (PPL).
6
7 The PPL is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 The PPL is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
20
21 For the most up-to-date information see the Parma Polyhedra Library
22 site: http://bugseng.com/products/ppl/ . */
23
24 #include "ppl-config.h"
25 #include "c_streambuf_defs.hh"
26 #include "globals_defs.hh"
27 #include "assertions.hh"
28
29 namespace Parma_Polyhedra_Library {
30
~c_streambuf()31 c_streambuf::~c_streambuf() {
32 }
33
34 c_streambuf::int_type
uflow()35 c_streambuf::uflow() {
36 const int_type c = underflow();
37 next_char_buf = traits_type::eof();
38 return c;
39 }
40
41 c_streambuf::int_type
underflow()42 c_streambuf::underflow() {
43 const int_type eof = traits_type::eof();
44 if (traits_type::eq_int_type(next_char_buf, eof)) {
45 char buf;
46 if (cb_read(&buf, 1) == 1) {
47 next_char_buf = buf;
48 }
49 else {
50 next_char_buf = eof;
51 }
52 }
53 return next_char_buf;
54 }
55
56 std::streamsize
xsgetn(char_type * s,std::streamsize n)57 c_streambuf::xsgetn(char_type* s, std::streamsize n) {
58 PPL_ASSERT(n >= 0);
59 if (n == 0) {
60 return n;
61 }
62 const int_type eof = traits_type::eof();
63 const size_t sz_n = static_cast<size_t>(n);
64 size_t a;
65 if (traits_type::eq_int_type(next_char_buf, eof)) {
66 a = 0;
67 }
68 else {
69 s[0] = static_cast<char_type>(next_char_buf);
70 a = 1;
71 }
72 const size_t r = cb_read(s + a, sz_n - a) + a;
73 if (r > 0) {
74 unget_char_buf = traits_type::to_int_type(s[r - 1]);
75 }
76 else {
77 unget_char_buf = traits_type::eof();
78 }
79 return static_cast<std::streamsize>(r);
80 }
81
82 c_streambuf::int_type
pbackfail(int_type c)83 c_streambuf::pbackfail(int_type c) {
84 const int_type eof = traits_type::eof();
85 next_char_buf = traits_type::eq_int_type(c, eof) ? unget_char_buf : c;
86 unget_char_buf = eof;
87 return next_char_buf;
88 }
89
90 std::streamsize
xsputn(const char_type * s,std::streamsize n)91 c_streambuf::xsputn(const char_type* s, std::streamsize n) {
92 PPL_ASSERT(n >= 0);
93 const size_t r = cb_write(s, static_cast<size_t>(n));
94 return static_cast<std::streamsize>(r);
95 }
96
97 c_streambuf::int_type
overflow(int_type c)98 c_streambuf::overflow(int_type c) {
99 const int_type eof = traits_type::eof();
100 if (traits_type::eq_int_type(c, eof)) {
101 return (sync() != 0) ? eof : traits_type::not_eof(c);
102 }
103 else {
104 char buf = static_cast<char>(c);
105 if (cb_write(&buf, 1) == 1) {
106 return c;
107 }
108 else {
109 return eof;
110 }
111 }
112 }
113
114 int
sync()115 c_streambuf::sync() {
116 return cb_sync();
117 }
118
119 } // namespace Parma_Polyhedra_Library
120