| 1 | /* $NetBSD: wcsftime.c,v 1.2 2006/10/04 14:19:16 tnozaki Exp $ */
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| 2 | /*-
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| 3 | * Copyright (c) 2002 Tim J. Robbins
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | *
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| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 25 | * SUCH DAMAGE.
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| 26 | */
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| 27 | #include <LibConfig.h>
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| 28 | #include <sys/EfiCdefs.h>
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| 29 | #if defined(LIBC_SCCS) && !defined(lint)
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| 30 | #if 0
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| 31 | __FBSDID("$FreeBSD: src/lib/libc/locale/wcsftime.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
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| 32 | #else
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| 33 | __RCSID("$NetBSD: wcsftime.c,v 1.2 2006/10/04 14:19:16 tnozaki Exp $");
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| 34 | #endif
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| 35 | #endif /* LIBC_SCCS and not lint */
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| 36 |
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| 37 | #include <errno.h>
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| 38 | #include <limits.h>
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| 39 | #include <stdlib.h>
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| 40 | #include <time.h>
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| 41 | #include <wchar.h>
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| 42 | #include <machine/int_limits.h>
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| 43 |
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| 44 | /*
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| 45 | * Convert date and time to a wide-character string.
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| 46 | *
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| 47 | * This is the wide-character counterpart of strftime(). So that we do not
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| 48 | * have to duplicate the code of strftime(), we convert the format string to
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| 49 | * multibyte, call strftime(), then convert the result back into wide
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| 50 | * characters.
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| 51 | *
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| 52 | * This technique loses in the presence of stateful multibyte encoding if any
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| 53 | * of the conversions in the format string change conversion state. When
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| 54 | * stateful encoding is implemented, we will need to reset the state between
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| 55 | * format specifications in the format string.
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| 56 | */
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| 57 | size_t
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| 58 | wcsftime(wchar_t *wcs, size_t maxsize,
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| 59 | const wchar_t *format, const struct tm *timeptr)
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| 60 | {
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| 61 | char *dst, *dstp, *sformat;
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| 62 | size_t n, sflen;
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| 63 | int sverrno;
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| 64 |
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| 65 | sformat = dst = NULL;
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| 66 |
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| 67 | /*
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| 68 | * Convert the supplied format string to a multibyte representation
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| 69 | * for strftime(), which only handles single-byte characters.
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| 70 | */
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| 71 | sflen = wcstombs(NULL, format, 0);
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| 72 | if (sflen == (size_t)-1)
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| 73 | goto error;
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| 74 | if ((sformat = malloc(sflen + 1)) == NULL)
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| 75 | goto error;
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| 76 | wcstombs(sformat, format, sflen + 1);
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| 77 |
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| 78 | /*
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| 79 | * Allocate memory for longest multibyte sequence that will fit
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| 80 | * into the caller's buffer and call strftime() to fill it.
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| 81 | * Then, copy and convert the result back into wide characters in
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| 82 | * the caller's buffer.
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| 83 | */
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| 84 | if (SIZE_T_MAX / MB_CUR_MAX <= maxsize) {
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| 85 | /* maxsize is preposturously large - avoid int. overflow. */
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| 86 | errno = EINVAL;
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| 87 | goto error;
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| 88 | }
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| 89 | dst = malloc(maxsize * MB_CUR_MAX);
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| 90 | if (dst == NULL)
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| 91 | goto error;
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| 92 | if (strftime(dst, maxsize, sformat, timeptr) == 0)
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| 93 | goto error;
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| 94 | dstp = dst;
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| 95 | n = mbstowcs(wcs, dstp, maxsize);
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| 96 | if (n == (size_t)-2 || n == (size_t)-1)
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| 97 | goto error;
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| 98 |
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| 99 | free(sformat);
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| 100 | free(dst);
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| 101 | return n;
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| 102 |
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| 103 | error:
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| 104 | sverrno = errno;
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| 105 | free(sformat);
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| 106 | free(dst);
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| 107 | errno = sverrno;
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| 108 | return 0;
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| 109 | }
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