xref: /titanic_50/usr/src/lib/libast/common/stdio/_stdfun.c (revision 275c9da86e89f8abf71135cf63d9fc23671b2e60)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                      by AT&T Knowledge Ventures                      *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #pragma prototyped
23 
24 #include <ast.h>
25 
26 #if !_UWIN
27 
28 void _STUB_stdfun(){}
29 
30 #else
31 
32 #include <ast_windows.h>
33 #include <uwin.h>
34 #include <dlfcn.h>
35 #include "FEATURE/uwin"
36 
37 #if _lib___iob_func
38 #define IOB		((char*)__iob_func())
39 #elif _dat__iob
40 #define IOB		((char*)_iob)
41 #else
42 #define IOB		((char*)__p__iob())
43 #endif
44 
45 #define IOBMAX		(512*32)
46 
47 #include "stdhdr.h"
48 
49 int
50 _stdfun(Sfio_t* f, Funvec_t* vp)
51 {
52 	static char*	iob;
53 	static int	init;
54 	static void*	bp;
55 	static void*	np;
56 
57 	if (!iob && !(iob = IOB))
58 		return 0;
59 	if (f && ((char*)f < iob || (char*)f > iob+IOBMAX))
60 		return 0;
61 	if (!vp->vec[1])
62 	{
63 		if (!init)
64 		{
65 			init = 1;
66 			bp = dlopen("/usr/bin/stdio.dll", 0);
67 		}
68 		if (bp && (vp->vec[1] = (Fun_f)dlsym(bp, vp->name)))
69 			return 1;
70 		if (!np && !(np = dlopen("/sys/msvcrt.dll", 0)))
71 			return -1;
72 		if (!(vp->vec[1] = (Fun_f)dlsym(np, vp->name)))
73 			return -1;
74 	}
75 	return 1;
76 }
77 
78 #endif
79