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-rw-r--r--tests/iobuf.h141
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1/* This file is part of GNU Pies.
2 Copyright (C) 2019 Sergey Poznyakoff
3
4 GNU Pies is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
7 any later version.
8
9 GNU Pies is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with GNU Pies. If not, see <http://www.gnu.org/licenses/>. */
16
17#define IO_BUF_SIZE 512
18
19struct iobuf
20{
21 char buf[IO_BUF_SIZE]; /* Initial line buffer */
22 size_t start; /* Start of data */
23 size_t avail; /* Start of available space */
24};
25
26static inline void
27iobuf_reset (struct iobuf *bp)
28{
29 bp->start = bp->avail = 0;
30}
31
32/* Return the count of data bytes in the buffer */
33static inline size_t
34iobuf_data_size (struct iobuf *bp)
35{
36 return bp->avail - bp->start;
37}
38
39static inline char *
40iobuf_data_ptr (struct iobuf *bp)
41{
42 return bp->buf + bp->start;
43}
44
45static inline void
46iobuf_data_advance (struct iobuf *bp, size_t n)
47{
48 bp->start += n;
49 if (bp->start == bp->avail)
50 iobuf_reset (bp);
51}
52
53static inline int
54iobuf_putback (struct iobuf *bp)
55{
56 return bp->buf[--bp->start-1];
57}
58
59static inline int
60iobuf_getc (struct iobuf *bp)
61{
62 int c = -1;
63 if (iobuf_data_size (bp) > 0)
64 {
65 c = *iobuf_data_ptr (bp);
66 iobuf_data_advance(bp, 1);
67 }
68 return c;
69}
70
71/* Return the count of available bytes in the buffer */
72static inline size_t
73iobuf_avail_size (struct iobuf *bp)
74{
75 return sizeof (bp->buf) - bp->avail;
76}
77
78static inline char *
79iobuf_avail_ptr (struct iobuf *bp)
80{
81 return bp->buf + bp->avail;
82}
83
84static inline void
85iobuf_avail_advance (struct iobuf *bp, size_t n)
86{
87 bp->avail += n;
88 if (iobuf_avail_size (bp) == 0 && iobuf_data_size (bp) == 0)
89 iobuf_reset (bp);
90}
91
92static inline int
93iobuf_putc (struct iobuf *bp, int c)
94{
95 if (iobuf_avail_size (bp) > 0)
96 {
97 *iobuf_avail_ptr (bp) = c;
98 iobuf_avail_advance (bp, 1);
99 return c;
100 }
101 return -1;
102}
103
104static inline ssize_t
105iobuf_fill (struct iobuf *bp, int fd)
106{
107 ssize_t n = read (fd, iobuf_avail_ptr (bp), iobuf_avail_size (bp));
108 if (n >= 0)
109 iobuf_avail_advance (bp, n);
110 return n;
111}
112
113static inline ssize_t
114iobuf_flush (struct iobuf *bp, int fd)
115{
116 ssize_t n = write (fd, iobuf_data_ptr (bp), iobuf_data_size (bp));
117 if (n >= 0)
118 iobuf_data_advance (bp, n);
119 return n;
120}
121
122static inline ssize_t
123iobuf_copy (struct iobuf *dst, struct iobuf *src)
124{
125 ssize_t n = iobuf_data_size (src);
126 if (n > 0)
127 {
128 ssize_t avail = iobuf_avail_size (dst);
129 if (avail < n)
130 n = avail;
131 if (n)
132 {
133 memcpy (iobuf_avail_ptr (dst), iobuf_data_ptr (src), n);
134 iobuf_avail_advance (dst, n);
135 iobuf_data_advance (src, n);
136 }
137 }
138 return 0;
139}
140
141

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