1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2010 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 wint_t
ungetwc(wint_t c,Sfio_t * f)27 ungetwc(wint_t c, Sfio_t* f)
28 {
29 register unsigned char* s = (unsigned char*)&c;
30 register unsigned char* e = s + sizeof(c);
31
32 STDIO_INT(f, "ungetwc", wint_t, (wint_t, Sfio_t*), (c, f))
33
34 FWIDE(f, WEOF);
35 while (s < e)
36 if (sfungetc(f, *s++) == EOF)
37 return WEOF;
38 return c;
39 }
40