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"
42 #include "un-namespace.h"
44 /* XXX: There is no FPOS_MAX. This assumes fpos_t is an off_t. */
45 #define FPOS_MAX OFF_MAX
55 memstream_grow(struct memstream *ms, fpos_t newoff)
60 if (newoff < 0 || newoff >= SSIZE_MAX)
61 newsize = SSIZE_MAX - 1;
64 if (newsize > ms->len) {
65 buf = realloc(*ms->bufp, newsize + 1);
68 fprintf(stderr, "MS: %p growing from %zd to %zd\n",
69 ms, ms->len, newsize);
71 memset(buf + ms->len + 1, 0, newsize - ms->len);
82 memstream_update(struct memstream *ms)
85 assert(ms->len >= 0 && ms->offset >= 0);
86 *ms->sizep = ms->len < ms->offset ? ms->len : ms->offset;
90 memstream_write(void *cookie, const char *buf, int len)
96 if (!memstream_grow(ms, ms->offset + len))
98 tocopy = ms->len - ms->offset;
101 memcpy(*ms->bufp + ms->offset, buf, tocopy);
102 ms->offset += tocopy;
103 memstream_update(ms);
105 fprintf(stderr, "MS: write(%p, %d) = %zd\n", ms, len, tocopy);
111 memstream_seek(void *cookie, fpos_t pos, int whence)
113 struct memstream *ms;
124 /* _fseeko() checks for negative offsets. */
129 /* This is only called by _ftello(). */
134 if (pos + ms->len < 0) {
137 "MS: bad SEEK_END: pos %jd, len %zd\n",
138 (intmax_t)pos, ms->len);
144 if (FPOS_MAX - ms->len < pos) {
147 "MS: bad SEEK_END: pos %jd, len %zd\n",
148 (intmax_t)pos, ms->len);
154 ms->offset = ms->len + pos;
157 memstream_update(ms);
159 fprintf(stderr, "MS: seek(%p, %jd, %d) %jd -> %jd\n", ms, (intmax_t)pos,
160 whence, (intmax_t)old, (intmax_t)ms->offset);
166 memstream_close(void *cookie)
174 open_memstream(char **bufp, size_t *sizep)
176 struct memstream *ms;
180 if (bufp == NULL || sizep == NULL) {
184 *bufp = calloc(1, 1);
187 ms = malloc(sizeof(*ms));
199 memstream_update(ms);
200 fp = funopen(ms, NULL, memstream_write, memstream_seek,