taskrambler  v0.1.8
Web server and task management solution.
cbuf/read.c
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1 /**
2  * \file
3  *
4  * \author Georg Hopp
5  *
6  * \copyright
7  * Copyright © 2012 Georg Hopp
8  *
9  * This program is free software: you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation, either version 3 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program. If not, see <http://www.gnu.org/licenses/>.
21  */
22 
23 #include <sys/types.h>
24 #include <unistd.h>
25 #include <errno.h>
26 
27 #include "cbuf.h"
28 #include "stream.h"
29 
30 
31 ssize_t
32 cbufRead(Cbuf this, Stream st)
33 {
34  size_t rsize = cbufGetFree(this);
35  ssize_t rrsize;
36 
37  if (0 == rsize) {
38  errno = ECBUFOVFL;
39  return -1;
40  }
41 
42  rrsize = streamRead(st, cbufGetWrite(this), rsize);
43 
44  if (0 < rrsize) {
45  cbufIncWrite(this, rrsize);
46  }
47 
48  return rrsize;
49 }
50 
51 // vim: set ts=4 sw=4:
size_t cbufGetFree(Cbuf this)
Definition: get_free.c:28
#define ECBUFOVFL
Definition: cbuf.h:43
ssize_t streamRead(Stream, void *, size_t)
Definition: stream/read.c:35
char * cbufGetWrite(Cbuf this)
Definition: get_write.c:26
void cbufIncWrite(Cbuf this, size_t n)
Definition: inc_write.c:28
ssize_t cbufRead(Cbuf this, Stream st)
Definition: cbuf/read.c:32