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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * Buffering to output and input. | |
4 | * Copyright (C) 1998 Kunihiro Ishiguro | |
5 | */ | |
6 | ||
7 | #ifndef _ZEBRA_BUFFER_H | |
8 | #define _ZEBRA_BUFFER_H | |
9 | ||
10 | #ifdef __cplusplus | |
11 | extern "C" { | |
12 | #endif | |
13 | ||
14 | /* Create a new buffer. Memory will be allocated in chunks of the given | |
15 | size. If the argument is 0, the library will supply a reasonable | |
16 | default size suitable for buffering socket I/O. */ | |
17 | extern struct buffer *buffer_new(size_t); | |
18 | ||
19 | /* Free all data in the buffer. */ | |
20 | extern void buffer_reset(struct buffer *); | |
21 | ||
22 | /* This function first calls buffer_reset to release all buffered data. | |
23 | Then it frees the struct buffer itself. */ | |
24 | extern void buffer_free(struct buffer *); | |
25 | ||
26 | /* Add the given data to the end of the buffer. */ | |
27 | extern void buffer_put(struct buffer *, const void *, size_t); | |
28 | /* Add a single character to the end of the buffer. */ | |
29 | extern void buffer_putc(struct buffer *, uint8_t); | |
30 | /* Add a NUL-terminated string to the end of the buffer. */ | |
31 | extern void buffer_putstr(struct buffer *, const char *); | |
32 | /* Add given data, inline-expanding \n to \r\n */ | |
33 | extern void buffer_put_crlf(struct buffer *b, const void *p, size_t size); | |
34 | ||
35 | /* Combine all accumulated (and unflushed) data inside the buffer into a | |
36 | single NUL-terminated string allocated using XMALLOC(MTYPE_TMP). Note | |
37 | that this function does not alter the state of the buffer, so the data | |
38 | is still inside waiting to be flushed. */ | |
39 | char *buffer_getstr(struct buffer *); | |
40 | ||
41 | /* Returns 1 if there is no pending data in the buffer. Otherwise returns 0. */ | |
42 | int buffer_empty(struct buffer *); | |
43 | ||
44 | typedef enum { | |
45 | /* An I/O error occurred. The buffer should be destroyed and the | |
46 | file descriptor should be closed. */ | |
47 | BUFFER_ERROR = -1, | |
48 | ||
49 | /* The data was written successfully, and the buffer is now empty | |
50 | (there is no pending data waiting to be flushed). */ | |
51 | BUFFER_EMPTY = 0, | |
52 | ||
53 | /* There is pending data in the buffer waiting to be flushed. Please | |
54 | try flushing the buffer when select indicates that the file | |
55 | descriptor | |
56 | is writeable. */ | |
57 | BUFFER_PENDING = 1 | |
58 | } buffer_status_t; | |
59 | ||
60 | /* Try to write this data to the file descriptor. Any data that cannot | |
61 | be written immediately is added to the buffer queue. */ | |
62 | extern buffer_status_t buffer_write(struct buffer *, int fd, const void *, | |
63 | size_t); | |
64 | ||
65 | /* This function attempts to flush some (but perhaps not all) of | |
66 | the queued data to the given file descriptor. */ | |
67 | extern buffer_status_t buffer_flush_available(struct buffer *, int fd); | |
68 | ||
69 | /* The following 2 functions (buffer_flush_all and buffer_flush_window) | |
70 | are for use in lib/vty.c only. They should not be used elsewhere. */ | |
71 | ||
72 | /* Call buffer_flush_available repeatedly until either all data has been | |
73 | flushed, or an I/O error has been encountered, or the operation would | |
74 | block. */ | |
75 | extern buffer_status_t buffer_flush_all(struct buffer *, int fd); | |
76 | ||
77 | /* Attempt to write enough data to the given fd to fill a window of the | |
78 | given width and height (and remove the data written from the buffer). | |
79 | ||
80 | If !no_more, then a message saying " --More-- " is appended. | |
81 | If erase is true, then first overwrite the previous " --More-- " message | |
82 | with spaces. | |
83 | ||
84 | Any write error (including EAGAIN or EINTR) will cause this function | |
85 | to return -1 (because the logic for handling the erase and more features | |
86 | is too complicated to retry the write later). | |
87 | */ | |
88 | extern buffer_status_t buffer_flush_window(struct buffer *, int fd, int width, | |
89 | int height, int erase, int no_more); | |
90 | ||
91 | #ifdef __cplusplus | |
92 | } | |
93 | #endif | |
94 | ||
95 | #endif /* _ZEBRA_BUFFER_H */ |