692a3987f2
for intmax_t MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D4434 Reported by: cppcheck Reviewed by: jhb Sponsored by: EMC / Isilon Storage Division
275 lines
6.3 KiB
C
275 lines
6.3 KiB
C
/*-
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* Copyright (c) 2013 Hudson River Trading LLC
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* Written by: John H. Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <assert.h>
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#include <errno.h>
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#ifdef DEBUG
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#include <inttypes.h>
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#endif
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include "un-namespace.h"
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/* XXX: There is no FPOS_MAX. This assumes fpos_t is an off_t. */
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#define FPOS_MAX OFF_MAX
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struct wmemstream {
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wchar_t **bufp;
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size_t *sizep;
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ssize_t len;
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fpos_t offset;
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mbstate_t mbstate;
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};
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static int
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wmemstream_grow(struct wmemstream *ms, fpos_t newoff)
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{
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wchar_t *buf;
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ssize_t newsize;
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if (newoff < 0 || newoff >= SSIZE_MAX / sizeof(wchar_t))
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newsize = SSIZE_MAX / sizeof(wchar_t) - 1;
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else
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newsize = newoff;
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if (newsize > ms->len) {
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buf = realloc(*ms->bufp, (newsize + 1) * sizeof(wchar_t));
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if (buf != NULL) {
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#ifdef DEBUG
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fprintf(stderr, "WMS: %p growing from %zd to %zd\n",
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ms, ms->len, newsize);
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#endif
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wmemset(buf + ms->len + 1, 0, newsize - ms->len);
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*ms->bufp = buf;
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ms->len = newsize;
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return (1);
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}
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return (0);
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}
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return (1);
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}
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static void
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wmemstream_update(struct wmemstream *ms)
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{
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assert(ms->len >= 0 && ms->offset >= 0);
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*ms->sizep = ms->len < ms->offset ? ms->len : ms->offset;
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}
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/*
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* Based on a starting multibyte state and an input buffer, determine
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* how many wchar_t's would be output. This doesn't use mbsnrtowcs()
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* so that it can handle embedded null characters.
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*/
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static size_t
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wbuflen(const mbstate_t *state, const char *buf, int len)
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{
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mbstate_t lenstate;
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size_t charlen, count;
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count = 0;
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lenstate = *state;
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while (len > 0) {
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charlen = mbrlen(buf, len, &lenstate);
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if (charlen == (size_t)-1)
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return (-1);
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if (charlen == (size_t)-2)
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break;
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if (charlen == 0)
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/* XXX: Not sure how else to handle this. */
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charlen = 1;
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len -= charlen;
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buf += charlen;
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count++;
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}
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return (count);
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}
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static int
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wmemstream_write(void *cookie, const char *buf, int len)
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{
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struct wmemstream *ms;
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ssize_t consumed, wlen;
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size_t charlen;
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ms = cookie;
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wlen = wbuflen(&ms->mbstate, buf, len);
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if (wlen < 0) {
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errno = EILSEQ;
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return (-1);
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}
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if (!wmemstream_grow(ms, ms->offset + wlen))
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return (-1);
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/*
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* This copies characters one at a time rather than using
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* mbsnrtowcs() so it can properly handle embedded null
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* characters.
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*/
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consumed = 0;
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while (len > 0 && ms->offset < ms->len) {
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charlen = mbrtowc(*ms->bufp + ms->offset, buf, len,
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&ms->mbstate);
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if (charlen == (size_t)-1) {
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if (consumed == 0) {
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errno = EILSEQ;
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return (-1);
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}
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/* Treat it as a successful short write. */
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break;
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}
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if (charlen == 0)
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/* XXX: Not sure how else to handle this. */
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charlen = 1;
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if (charlen == (size_t)-2) {
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consumed += len;
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len = 0;
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} else {
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consumed += charlen;
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buf += charlen;
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len -= charlen;
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ms->offset++;
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}
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}
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wmemstream_update(ms);
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#ifdef DEBUG
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fprintf(stderr, "WMS: write(%p, %d) = %zd\n", ms, len, consumed);
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#endif
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return (consumed);
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}
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static fpos_t
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wmemstream_seek(void *cookie, fpos_t pos, int whence)
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{
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struct wmemstream *ms;
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fpos_t old;
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ms = cookie;
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old = ms->offset;
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switch (whence) {
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case SEEK_SET:
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/* _fseeko() checks for negative offsets. */
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assert(pos >= 0);
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ms->offset = pos;
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break;
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case SEEK_CUR:
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/* This is only called by _ftello(). */
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assert(pos == 0);
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break;
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case SEEK_END:
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if (pos < 0) {
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if (pos + ms->len < 0) {
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#ifdef DEBUG
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fprintf(stderr,
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"WMS: bad SEEK_END: pos %jd, len %zd\n",
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(intmax_t)pos, ms->len);
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#endif
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errno = EINVAL;
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return (-1);
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}
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} else {
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if (FPOS_MAX - ms->len < pos) {
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#ifdef DEBUG
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fprintf(stderr,
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"WMS: bad SEEK_END: pos %jd, len %zd\n",
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(intmax_t)pos, ms->len);
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#endif
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errno = EOVERFLOW;
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return (-1);
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}
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}
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ms->offset = ms->len + pos;
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break;
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}
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/* Reset the multibyte state if a seek changes the position. */
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if (ms->offset != old)
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memset(&ms->mbstate, 0, sizeof(ms->mbstate));
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wmemstream_update(ms);
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#ifdef DEBUG
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fprintf(stderr, "WMS: seek(%p, %jd, %d) %jd -> %jd\n", ms,
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(intmax_t)pos, whence, (intmax_t)old, (intmax_t)ms->offset);
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#endif
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return (ms->offset);
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}
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static int
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wmemstream_close(void *cookie)
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{
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free(cookie);
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return (0);
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}
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FILE *
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open_wmemstream(wchar_t **bufp, size_t *sizep)
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{
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struct wmemstream *ms;
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int save_errno;
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FILE *fp;
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if (bufp == NULL || sizep == NULL) {
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errno = EINVAL;
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return (NULL);
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}
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*bufp = calloc(1, sizeof(wchar_t));
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if (*bufp == NULL)
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return (NULL);
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ms = malloc(sizeof(*ms));
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if (ms == NULL) {
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save_errno = errno;
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free(*bufp);
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*bufp = NULL;
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errno = save_errno;
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return (NULL);
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}
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ms->bufp = bufp;
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ms->sizep = sizep;
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ms->len = 0;
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ms->offset = 0;
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memset(&ms->mbstate, 0, sizeof(mbstate_t));
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wmemstream_update(ms);
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fp = funopen(ms, NULL, wmemstream_write, wmemstream_seek,
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wmemstream_close);
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if (fp == NULL) {
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save_errno = errno;
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free(ms);
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free(*bufp);
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*bufp = NULL;
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errno = save_errno;
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return (NULL);
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}
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fwide(fp, 1);
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return (fp);
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}
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