ungetwc.c (1e98f88776fc606df245a382685b1ac634a81389) ungetwc.c (e74101e4eff767325553039def89de70b70f36d3)
1/*-
1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
2 * Copyright (c) 2002 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright

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24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include "namespace.h"
31#include <errno.h>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright

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24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include "namespace.h"
31#include <errno.h>
32#include <limits.h>
32#include <rune.h>
33#include <stdio.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <wchar.h>
36#include "un-namespace.h"
37#include "libc_private.h"
38#include "local.h"
34#include <wchar.h>
35#include "un-namespace.h"
36#include "libc_private.h"
37#include "local.h"
39#include "mblocal.h"
40
38
41/*
42 * Non-MT-safe version.
43 */
44wint_t
39wint_t
45__ungetwc(wint_t wc, FILE *fp)
46{
47 char buf[MB_LEN_MAX];
48 size_t len;
49
50 if (wc == WEOF)
51 return (WEOF);
52 if ((len = __wcrtomb(buf, wc, &fp->_mbstate)) == (size_t)-1) {
53 fp->_flags |= __SERR;
54 return (WEOF);
55 }
56 while (len-- != 0)
57 if (__ungetc((unsigned char)buf[len], fp) == EOF)
58 return (WEOF);
59
60 return (wc);
61}
62
63/*
64 * MT-safe version.
65 */
66wint_t
67ungetwc(wint_t wc, FILE *fp)
68{
40ungetwc(wint_t wc, FILE *fp)
41{
69 wint_t r;
70
42
71 FLOCKFILE(fp);
72 ORIENT(fp, 1);
73 r = __ungetwc(wc, fp);
74 FUNLOCKFILE(fp);
43 ORIENTLOCK(fp, 1);
75
44
76 return (r);
45 return (fungetrune((rune_t)wc, fp) == EOF ? WEOF : wc);
77}
46}