1 /******************************************************************************/
2 /* pfixtools: a collection of postfix related tools */
4 /* ________________________________________________________________________ */
6 /* Redistribution and use in source and binary forms, with or without */
7 /* modification, are permitted provided that the following conditions */
10 /* 1. Redistributions of source code must retain the above copyright */
11 /* notice, this list of conditions and the following disclaimer. */
12 /* 2. Redistributions in binary form must reproduce the above copyright */
13 /* notice, this list of conditions and the following disclaimer in the */
14 /* documentation and/or other materials provided with the distribution. */
15 /* 3. The names of its contributors may not be used to endorse or promote */
16 /* products derived from this software without specific prior written */
19 /* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */
20 /* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */
21 /* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
22 /* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */
23 /* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */
24 /* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */
25 /* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */
26 /* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
27 /* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */
28 /* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */
29 /* THE POSSIBILITY OF SUCH DAMAGE. */
30 /******************************************************************************/
33 * Copyright © 2006-2007 Pierre Habouzit
42 #define BUFSIZ_INCREMENT 256
44 void buffer_resize(buffer_t *buf, ssize_t newsize)
46 if (newsize >= buf->size) {
47 /* rounds newsize to the 1024 multiple just after newsize+1 */
48 newsize = (newsize + BUFSIZ_INCREMENT) & ~(BUFSIZ_INCREMENT - 1);
49 p_realloc(&buf->data, newsize);
53 void buffer_consume(buffer_t *buf, ssize_t len) {
57 if (len >= buf->len) {
62 memmove(buf->data, buf->data + len, buf->len + 1 - len);
66 ssize_t buffer_read(buffer_t *buf, int fd, ssize_t count)
73 buffer_ensure(buf, count);
75 res = read(fd, buf->data + buf->len, count);
77 buf->data[buf->len] = '\0';
81 buffer_extend(buf, res);
85 ssize_t buffer_write(buffer_t *buf, int fd)
87 ssize_t res = write(fd, buf->data, buf->len);
89 return errno == EINTR || errno == EAGAIN ? 0 : -1;
91 buffer_consume(buf, res);