xref: /titanic_44/usr/src/lib/libast/common/stdio/vfwscanf.c (revision 0db3240d392634cfff2f95fb6da34b56b8dc574f)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2009 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
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 "stdhdr.h"
25 
26 typedef struct
27 {
28 	Sfdisc_t	sfdisc;		/* sfio discipline		*/
29 	Sfio_t*		f;		/* original wide stream		*/
30 	char		fmt[1];		/* mb fmt			*/
31 } Wide_t;
32 
33 /*
34  * wide exception handler
35  * free on close
36  */
37 
38 static int
39 wideexcept(Sfio_t* f, int op, void* val, Sfdisc_t* dp)
40 {
41 	if (sffileno(f) >= 0)
42 		return -1;
43 	switch (op)
44 	{
45 	case SF_ATEXIT:
46 		sfdisc(f, SF_POPDISC);
47 		break;
48 	case SF_CLOSING:
49 	case SF_DPOP:
50 	case SF_FINAL:
51 		if (op != SF_CLOSING)
52 			free(dp);
53 		break;
54 	}
55 	return 0;
56 }
57 
58 /*
59  * sfio wide discipline read
60  * 1 wchar_t at a time
61  * go pure multibyte for best performance
62  */
63 
64 static ssize_t
65 wideread(Sfio_t* f, Void_t* buf, size_t size, Sfdisc_t* dp)
66 {
67 	register Wide_t*	w = (Wide_t*)dp;
68 	wchar_t			wuf[2];
69 
70 #if 0
71 	if (sfread(w->f, wuf, sizeof(wuf[0])) != sizeof(wuf[0]))
72 		return -1;
73 	wuf[1] = 0;
74 	return wcstombs(buf, wuf, size);
75 #else
76 	ssize_t	r;
77 
78 	r = sfread(w->f, wuf, sizeof(wuf[0]));
79 	if (r != sizeof(wuf[0]))
80 		return -1;
81 	wuf[1] = 0;
82 	r = wcstombs(buf, wuf, size);
83 	return r;
84 #endif
85 }
86 
87 int
88 vfwscanf(Sfio_t* f, const wchar_t* fmt, va_list args)
89 {
90 	size_t	n;
91 	int	v;
92 	Sfio_t*	t;
93 	Wide_t*	w;
94 	char	buf[1024];
95 
96 	STDIO_INT(f, "vfwscanf", int, (Sfio_t*, const wchar_t*, va_list), (f, fmt, args))
97 
98 	FWIDE(f, WEOF);
99 	n = wcstombs(NiL, fmt, 0);
100 	if (w = newof(0, Wide_t, 1, n))
101 	{
102 		if (t = sfnew(NiL, buf, sizeof(buf), OPEN_MAX+1, SF_READ))
103 		{
104 			w->sfdisc.exceptf = wideexcept;
105 			w->sfdisc.readf = wideread;
106 			w->f = f;
107 			if (sfdisc(t, &w->sfdisc) == &w->sfdisc)
108 			{
109 				wcstombs(w->fmt, fmt, n + 1);
110 				v = sfvscanf(t, w->fmt, args);
111 			}
112 			else
113 			{
114 				free(w);
115 				v = -1;
116 			}
117 			sfsetfd(t, -1);
118 			sfclose(t);
119 		}
120 		else
121 		{
122 			free(w);
123 			v = -1;
124 		}
125 	}
126 	else
127 		v = -1;
128 	return v;
129 }
130