readline.c

一个收集所有最基本功能的函数库；所有的函数都是尽量短小和简单 使用 doxygen 生成文档 所有代码以在 Linux 系统上可以编译并运行为准；每当在 lib 目录里增加了一个功能函数

/***************************************************************************
 *            readline.c
 *
 *  Mon May 21 18:07:51 2007
 *  Copyright  2007  kf701
 *  Email <kf701.ye AT gmail.com>
 ****************************************************************************/

/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
 


#include <errno.h>
#include "kf701.h"

/**
 * @brief read line from fd
 * @param vptr buffer
 * @param maxlen length of vptr
 * @return read a line stored in vptr
 * @retval the number of bytes on success
 * @retval -1 on error
 */
int32_t readline2(int fd, void *vptr, uint32_t maxlen)
{
        int n, rc;
        char    c, *ptr;

        ptr = vptr;
        for (n = 1; n < maxlen; n++) {
again:
                if ( (rc = read(fd, &c, 1)) == 1) {
                        *ptr++ = c;
                        if (c == '\n')
                        {
                                break;  /* newline is stored, like fgets() */
                        }
                } else if (rc == 0) {
                        if (n == 1)
                                return(0);      /* EOF, no data read */
                        else
                                break;  /* EOF, some data was read */
                } else {
                        if (errno == EINTR)
                                goto again;
                        return(-1);             /* error, errno set by read() */
                }
        }

        *ptr = 0;       /* null terminate like fgets() */
        return(n);
}