sockets/read_line_buf.h

This is sockets/read_line_buf.h, an example to accompany the book, The Linux Programming Interface.

This file is not printed in the book; it is the solution to Exercise 59-1:b (page 1236).

The source code file is copyright 2022, Michael Kerrisk, and is licensed under the GNU Lesser General Public License, version 3.

In the listing below, the names of Linux system calls and C library functions are hyperlinked to manual pages from the Linux man-pages project, and the names of functions implemented in the book are hyperlinked to the implementations of those functions.

 

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  Cover of The Linux Programming Interface
/* read_line_buf.h

   Header file for read_line_buf.c (implementation of readLineBuf()).
*/
#ifndef READ_LINE_BUF_H         /* Prevent accidental double inclusion */
#define READ_LINE_BUF_H

#include <unistd.h>
#include <pthread.h>
#include <errno.h>

#define RL_MAX_BUF 10

struct ReadLineBuf {
    int     fd;                 /* File descriptor from which to read */
    char    buf[RL_MAX_BUF];    /* Current buffer from file */
    int     next;               /* Index of next unread character in 'buf' */
    ssize_t len;                /* Number of characters in 'buf' */
};

void readLineBufInit(int fd, struct ReadLineBuf *rlbuf);

ssize_t readLineBuf(struct ReadLineBuf *rlbuf, char *buffer, size_t n);

#endif

 

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