projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9385eb3d A |
1 | /*- |
| 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 | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * | |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 24 | * SUCH DAMAGE. | |
| 25 | */ | |
| 26 | ||
| 27 | #include <sys/cdefs.h> | |
| 28 | __FBSDID("$FreeBSD: src/lib/libc/stdio/fgetwc.c,v 1.6 2002/10/16 12:09:43 tjr Exp $"); | |
| 29 | ||
| 30 | #include "namespace.h" | |
| 31 | #include <errno.h> | |
| 32 | #include <stdio.h> | |
| 33 | #include <stdlib.h> | |
| 34 | #include <wchar.h> | |
| 35 | #include "un-namespace.h" | |
| 36 | #include "libc_private.h" | |
| 37 | #include "local.h" | |
| 38 | ||
| 39 | static __inline wint_t __fgetwc_nbf(FILE *); | |
| 40 | ||
| 41 | /* | |
| 42 | * Non-MT-safe version. | |
| 43 | */ | |
| 44 | wint_t | |
| 45 | __fgetwc(FILE *fp) | |
| 46 | { | |
| 47 | wint_t wc; | |
| 48 | ||
| 49 | if (MB_CUR_MAX == 1) { | |
| 50 | /* | |
| 51 | * Assume we're using a single-byte locale. A safer test | |
| 52 | * might be to check _CurrentRuneLocale->encoding. | |
| 53 | */ | |
| 54 | wc = (wint_t)__sgetc(fp); | |
| 55 | } else | |
| 56 | wc = __fgetwc_nbf(fp); | |
| 57 | ||
| 58 | return (wc); | |
| 59 | } | |
| 60 | ||
| 61 | /* | |
| 62 | * MT-safe version. | |
| 63 | */ | |
| 64 | wint_t | |
| 65 | fgetwc(FILE *fp) | |
| 66 | { | |
| 67 | wint_t r; | |
| 68 | ||
| 69 | FLOCKFILE(fp); | |
| 70 | ORIENT(fp, 1); | |
| 71 | r = __fgetwc(fp); | |
| 72 | FUNLOCKFILE(fp); | |
| 73 | ||
| 74 | return (r); | |
| 75 | } | |
| 76 | ||
| 77 | static __inline wint_t | |
| 78 | __fgetwc_nbf(FILE *fp) | |
| 79 | { | |
| 80 | char buf[MB_LEN_MAX]; | |
| 81 | mbstate_t mbs; | |
| 82 | size_t n, nconv; | |
| 83 | int c; | |
| 84 | wchar_t wc; | |
| 85 | ||
| 86 | n = 0; | |
| 87 | while (n < MB_CUR_MAX) { | |
| 88 | if ((c = __sgetc(fp)) == EOF) { | |
| 89 | if (n == 0) | |
| 90 | return (WEOF); | |
| 91 | break; | |
| 92 | } | |
| 93 | buf[n++] = (char)c; | |
| 94 | memset(&mbs, 0, sizeof(mbs)); | |
| 95 | nconv = mbrtowc(&wc, buf, n, &mbs); | |
| 96 | if (nconv == n) | |
| 97 | return (wc); | |
| 98 | else if (nconv == 0) | |
| 99 | return (L'\0'); | |
| 100 | else if (nconv == (size_t)-1) | |
| 101 | break; | |
| 102 | } | |
| 103 | ||
| 104 | while (n-- != 0) | |
| 105 | __ungetc((unsigned char)buf[n], fp); | |
| 106 | errno = EILSEQ; | |
| 107 | fp->_flags |= __SERR; | |
| 108 | return (WEOF); | |
| 109 | } |