/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- CORD_ec
1 # ifndef EC_H
2 # define EC_H
3
4 # ifndef CORD_H
5 # include "cord.h"
6 # endif
7
8 /* Extensible cords are strings that may be destructively appended to. */
9 /* They allow fast construction of cords from characters that are */
10 /* being read from a stream. */
11 /*
12 * A client might look like:
13 *
14 * {
15 * CORD_ec x;
16 * CORD result;
17 * char c;
18 * FILE *f;
19 *
20 * ...
21 * CORD_ec_init(x);
22 * while(...) {
23 * c = getc(f);
24 * ...
25 * CORD_ec_append(x, c);
26 * }
27 * result = CORD_balance(CORD_ec_to_cord(x));
28 *
29 * If a C string is desired as the final result, the call to CORD_balance
30 * may be replaced by a call to CORD_to_char_star.
31 */
32
33 # ifndef CORD_BUFSZ
34 # define CORD_BUFSZ 128
35 # endif
36
37 typedef struct CORD_ec_struct {
38 CORD ec_cord;
39 char * ec_bufptr;
40 char ec_buf[CORD_BUFSZ+1];
41 } CORD_ec[1];
42
43 /* This structure represents the concatenation of ec_cord with */
44 /* ec_buf[0 ... (ec_bufptr-ec_buf-1)] */
45
46 /* Flush the buffer part of the extended chord into ec_cord. */
47 /* Note that this is almost the only real function, and it is */
48 /* implemented in 6 lines in cordxtra.c */
49 void CORD_ec_flush_buf(CORD_ec x);
50
51 /* Convert an extensible cord to a cord. */
52 # define CORD_ec_to_cord(x) (CORD_ec_flush_buf(x), (x)[0].ec_cord)
53
54 /* Initialize an extensible cord. */
55 # define CORD_ec_init(x) ((x)[0].ec_cord = 0, (x)[0].ec_bufptr = (x)[0].ec_buf)
56
57 /* Append a character to an extensible cord. */
58 # define CORD_ec_append(x, c) \
59 { \
60 if ((x)[0].ec_bufptr == (x)[0].ec_buf + CORD_BUFSZ) { \
61 CORD_ec_flush_buf(x); \
62 } \
63 *((x)[0].ec_bufptr)++ = (c); \
64 }
65
66 /* Append a cord to an extensible cord. Structure remains shared with */
67 /* original. */
68 void CORD_ec_append_cord(CORD_ec x, CORD s);
69
70 # endif /* EC_H */