2 * Copyright (c) 2013 Hudson River Trading LLC
3 * Written by: John H. Baldwin <jhb@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include "namespace.h"
39 #include "un-namespace.h"
41 /* XXX: There is no FPOS_MAX. This assumes fpos_t is an off_t. */
42 #define FPOS_MAX OFF_MAX
52 memstream_grow(struct memstream *ms, fpos_t newoff)
57 if (newoff < 0 || newoff >= SSIZE_MAX)
58 newsize = SSIZE_MAX - 1;
61 if (newsize > ms->len) {
62 buf = realloc(*ms->bufp, newsize + 1);
65 fprintf(stderr, "MS: %p growing from %zd to %zd\n",
66 ms, ms->len, newsize);
68 memset(buf + ms->len + 1, 0, newsize - ms->len);
79 memstream_update(struct memstream *ms)
82 assert(ms->len >= 0 && ms->offset >= 0);
83 *ms->sizep = ms->len < ms->offset ? ms->len : ms->offset;
87 memstream_write(void *cookie, const char *buf, int len)
93 if (!memstream_grow(ms, ms->offset + len))
95 tocopy = ms->len - ms->offset;
98 memcpy(*ms->bufp + ms->offset, buf, tocopy);
100 memstream_update(ms);
102 fprintf(stderr, "MS: write(%p, %d) = %zd\n", ms, len, tocopy);
108 memstream_seek(void *cookie, fpos_t pos, int whence)
110 struct memstream *ms;
121 /* _fseeko() checks for negative offsets. */
126 /* This is only called by _ftello(). */
131 if (pos + ms->len < 0) {
134 "MS: bad SEEK_END: pos %jd, len %zd\n",
135 (intmax_t)pos, ms->len);
141 if (FPOS_MAX - ms->len < pos) {
144 "MS: bad SEEK_END: pos %jd, len %zd\n",
145 (intmax_t)pos, ms->len);
151 ms->offset = ms->len + pos;
154 memstream_update(ms);
156 fprintf(stderr, "MS: seek(%p, %jd, %d) %jd -> %jd\n", ms, (intmax_t)pos,
157 whence, (intmax_t)old, (intmax_t)ms->offset);
163 memstream_close(void *cookie)
171 open_memstream(char **bufp, size_t *sizep)
173 struct memstream *ms;
177 if (bufp == NULL || sizep == NULL) {
181 *bufp = calloc(1, 1);
184 ms = malloc(sizeof(*ms));
196 memstream_update(ms);
197 fp = funopen(ms, NULL, memstream_write, memstream_seek,