1 /* Part of XPCE --- The SWI-Prolog GUI toolkit
2
3 Author: Jan Wielemaker and Anjo Anjewierden
4 E-mail: jan@swi.psy.uva.nl
5 WWW: http://www.swi.psy.uva.nl/projects/xpce/
6 Copyright (c) 1995-2013, University of Amsterdam
7 All rights reserved.
8
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions
11 are met:
12
13 1. Redistributions of source code must retain the above copyright
14 notice, this list of conditions and the following disclaimer.
15
16 2. Redistributions in binary form must reproduce the above copyright
17 notice, this list of conditions and the following disclaimer in
18 the documentation and/or other materials provided with the
19 distribution.
20
21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <stdio.h>
36 #include <stdarg.h>
37
38 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
39 XPCE Console IO is only used for debugging purposes. On Unix systems
40 this IO will normally be bound to Unix stdout/stdin. On strictly window
41 based systems you may redefine these functions to use a window.
42
43 void
44 vCprintf(const char *fmt, va_list args)
45 Behaves like: vprintf(fmt, args);
46
47 int
48 Cputchar(int chr)
49 Behaves like: putchar(chr);
50
51 void
52 Cflush(void)
53 Behaves like fflush(stdout);
54
55 char *
56 Cgetline(char *buf, int size)
57 Behaves like: fgets(buf, size, stdin);
58 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
59
60 #ifdef __WINDOWS__
61
62 static FILE *console_in = NULL;
63 static FILE *console_out = NULL;
64
65 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
66 Whenever a stand-alone XPCE/Something application writes explicitely to
67 the console, this stub will allocate a console to write to. Note the use
68 of _IONBF, instead of _IOLBF which would be much more natural. It
69 doesn't appear to work however (Windows-NT 4.0, MSVC 4.2).
70 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
71
72 #include <windows.h>
73 #include <io.h>
74 #include <fcntl.h>
75
76 static int
ensure_console(void)77 ensure_console(void)
78 { static int allocated = 0;
79
80 if ( !allocated )
81 { allocated++;
82 if ( AllocConsole() )
83 { HANDLE hin = GetStdHandle(STD_INPUT_HANDLE);
84 HANDLE hout = GetStdHandle(STD_OUTPUT_HANDLE);
85 int in = _open_osfhandle((intptr_t)hin, _O_RDONLY);
86 int out = _open_osfhandle((intptr_t)hout, _O_APPEND);
87
88 console_in = _fdopen(in, "r");
89 console_out = _fdopen(out, "w");
90
91 setvbuf(console_in, NULL, _IONBF, 256);
92 setvbuf(console_out, NULL, _IONBF, 256);
93 }
94 }
95
96 return 1;
97 }
98
99 #else /* ~__WINDOWS__ */
100
101 static FILE *console_in = NULL;
102 static FILE *console_out = NULL;
103
104 static int
ensure_console()105 ensure_console()
106 { console_in = stdin;
107 console_out = stdout;
108
109 return 1;
110 }
111
112 #endif /*__WINDOWS__*/
113
114 void
Stub__vCprintf(const char * fmt,va_list args)115 Stub__vCprintf(const char *fmt, va_list args)
116 { if ( ensure_console() )
117 vfprintf(console_out, fmt, args);
118 }
119
120
121 int
Stub__Cputchar(int chr)122 Stub__Cputchar(int chr)
123 { if ( ensure_console() )
124 return fputc(chr, console_out);
125 else
126 return EOF; /* signal error */
127 }
128
129
130 char *
Stub__Cgetline(char * line,int size)131 Stub__Cgetline(char *line, int size)
132 { if ( ensure_console() )
133 return fgets(line, size, console_in);
134 else
135 return NULL; /* signal error */
136 }
137
138
139 void
Stub__Cflush()140 Stub__Cflush()
141 { if ( ensure_console() )
142 fflush(console_out);
143 }
144