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acddc0ed3c
Done with a combination of regex'ing and banging my head against a wall. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Buffering to output and input.
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* Copyright (C) 1998 Kunihiro Ishiguro
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*/
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#ifndef _ZEBRA_BUFFER_H
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#define _ZEBRA_BUFFER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Create a new buffer. Memory will be allocated in chunks of the given
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size. If the argument is 0, the library will supply a reasonable
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default size suitable for buffering socket I/O. */
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extern struct buffer *buffer_new(size_t);
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/* Free all data in the buffer. */
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extern void buffer_reset(struct buffer *);
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/* This function first calls buffer_reset to release all buffered data.
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Then it frees the struct buffer itself. */
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extern void buffer_free(struct buffer *);
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/* Add the given data to the end of the buffer. */
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extern void buffer_put(struct buffer *, const void *, size_t);
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/* Add a single character to the end of the buffer. */
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extern void buffer_putc(struct buffer *, uint8_t);
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/* Add a NUL-terminated string to the end of the buffer. */
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extern void buffer_putstr(struct buffer *, const char *);
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/* Add given data, inline-expanding \n to \r\n */
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extern void buffer_put_crlf(struct buffer *b, const void *p, size_t size);
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/* Combine all accumulated (and unflushed) data inside the buffer into a
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single NUL-terminated string allocated using XMALLOC(MTYPE_TMP). Note
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that this function does not alter the state of the buffer, so the data
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is still inside waiting to be flushed. */
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char *buffer_getstr(struct buffer *);
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/* Returns 1 if there is no pending data in the buffer. Otherwise returns 0. */
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int buffer_empty(struct buffer *);
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typedef enum {
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/* An I/O error occurred. The buffer should be destroyed and the
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file descriptor should be closed. */
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BUFFER_ERROR = -1,
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/* The data was written successfully, and the buffer is now empty
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(there is no pending data waiting to be flushed). */
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BUFFER_EMPTY = 0,
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/* There is pending data in the buffer waiting to be flushed. Please
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try flushing the buffer when select indicates that the file
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descriptor
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is writeable. */
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BUFFER_PENDING = 1
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} buffer_status_t;
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/* Try to write this data to the file descriptor. Any data that cannot
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be written immediately is added to the buffer queue. */
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extern buffer_status_t buffer_write(struct buffer *, int fd, const void *,
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size_t);
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/* This function attempts to flush some (but perhaps not all) of
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the queued data to the given file descriptor. */
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extern buffer_status_t buffer_flush_available(struct buffer *, int fd);
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/* The following 2 functions (buffer_flush_all and buffer_flush_window)
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are for use in lib/vty.c only. They should not be used elsewhere. */
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/* Call buffer_flush_available repeatedly until either all data has been
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flushed, or an I/O error has been encountered, or the operation would
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block. */
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extern buffer_status_t buffer_flush_all(struct buffer *, int fd);
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/* Attempt to write enough data to the given fd to fill a window of the
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given width and height (and remove the data written from the buffer).
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If !no_more, then a message saying " --More-- " is appended.
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If erase is true, then first overwrite the previous " --More-- " message
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with spaces.
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Any write error (including EAGAIN or EINTR) will cause this function
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to return -1 (because the logic for handling the erase and more features
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is too complicated to retry the write later).
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*/
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extern buffer_status_t buffer_flush_window(struct buffer *, int fd, int width,
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int height, int erase, int no_more);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ZEBRA_BUFFER_H */
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