2 * This file is part of DisOrder
3 * Copyright (C) 2004, 2007, 2008 Richard Kettlewell
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * @brief Abstract output sink type
33 * A sink is something you write bytes to; the opposite would be a
34 * source. We provide sink_stdio() and sink_dynstr() to create sinks
35 * to write to stdio streams and dynamic strings.
38 /** @brief Write callback
39 * @param s Sink to write to
40 * @param buffer First byte to write
41 * @param nbytes Number of bytes to write
42 * @return non-negative on success, -1 on error
44 int (*write
)(struct sink
*s
, const void *buffer
, int nbytes
);
47 struct sink
*sink_stdio(const char *name
, FILE *fp
);
48 /* return a sink which writes to @fp@. If @name@ is not a null
49 * pointer, it will be used in (fatal) error messages; if it is a null
50 * pointer then errors will be signalled by returning -1. */
52 struct sink
*sink_dynstr(struct dynstr
*output
);
53 /* return a sink which appends to @output@. */
55 struct sink
*sink_discard(void);
56 /* return a sink which junks everything */
58 struct sink
*sink_error(void);
59 /* return a sink which fails all writes */
61 int sink_vprintf(struct sink
*s
, const char *fmt
, va_list ap
);
62 int sink_printf(struct sink
*s
, const char *fmt
, ...)
63 attribute((format (printf
, 2, 3)));
64 /* equivalent of vfprintf/fprintf for sink @s@ */
66 /** @brief Write bytes to a sink
67 * @param s Sink to write to
68 * @param buffer First byte to write
69 * @param nbytes Number of bytes to write
70 * @return non-negative on success, -1 on error
72 static inline int sink_write(struct sink
*s
, const void *buffer
, int nbytes
) {
73 return s
->write(s
, buffer
, nbytes
);
76 /** @brief Write string to a sink
77 * @param s Sink to write to
78 * @param str String to write
79 * @return non-negative on success, -1 on error
81 static inline int sink_writes(struct sink
*s
, const char *str
) {
82 return s
->write(s
, str
, strlen(str
));
85 /** @brief Write one byte to a sink
86 * @param s Sink to write to
87 * @param c Byte to write (as a @c char)
88 * @return non-negative on success, -1 on error
90 static inline int sink_writec(struct sink
*s
, char c
) {
91 return s
->write(s
, &c
, 1);