2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2013 Hudson River Trading LLC
5 * Written by: John H. Baldwin <jhb@FreeBSD.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include "namespace.h"
44 #include "un-namespace.h"
46 /* XXX: There is no FPOS_MAX. This assumes fpos_t is an off_t. */
47 #define FPOS_MAX OFF_MAX
57 memstream_grow(struct memstream *ms, fpos_t newoff)
62 if (newoff < 0 || newoff >= SSIZE_MAX)
63 newsize = SSIZE_MAX - 1;
66 if (newsize > ms->len) {
67 buf = realloc(*ms->bufp, newsize + 1);
70 fprintf(stderr, "MS: %p growing from %zd to %zd\n",
71 ms, ms->len, newsize);
73 memset(buf + ms->len + 1, 0, newsize - ms->len);
84 memstream_update(struct memstream *ms)
87 assert(ms->len >= 0 && ms->offset >= 0);
88 *ms->sizep = ms->len < ms->offset ? ms->len : ms->offset;
92 memstream_write(void *cookie, const char *buf, int len)
98 if (!memstream_grow(ms, ms->offset + len))
100 tocopy = ms->len - ms->offset;
103 memcpy(*ms->bufp + ms->offset, buf, tocopy);
104 ms->offset += tocopy;
105 memstream_update(ms);
107 fprintf(stderr, "MS: write(%p, %d) = %zd\n", ms, len, tocopy);
113 memstream_seek(void *cookie, fpos_t pos, int whence)
115 struct memstream *ms;
126 /* _fseeko() checks for negative offsets. */
131 /* This is only called by _ftello(). */
136 if (pos + ms->len < 0) {
139 "MS: bad SEEK_END: pos %jd, len %zd\n",
140 (intmax_t)pos, ms->len);
146 if (FPOS_MAX - ms->len < pos) {
149 "MS: bad SEEK_END: pos %jd, len %zd\n",
150 (intmax_t)pos, ms->len);
156 ms->offset = ms->len + pos;
159 memstream_update(ms);
161 fprintf(stderr, "MS: seek(%p, %jd, %d) %jd -> %jd\n", ms, (intmax_t)pos,
162 whence, (intmax_t)old, (intmax_t)ms->offset);
168 memstream_close(void *cookie)
176 open_memstream(char **bufp, size_t *sizep)
178 struct memstream *ms;
182 if (bufp == NULL || sizep == NULL) {
186 *bufp = calloc(1, 1);
189 ms = malloc(sizeof(*ms));
201 memstream_update(ms);
202 fp = funopen(ms, NULL, memstream_write, memstream_seek,