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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1989 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 3.3 */
/*LINTLIBRARY*/
/*
* This version reads directly from the buffer rather than looping on getc.
* Ptr args aren't checked for NULL because the program would be a
* catastrophic mess anyway. Better to abort than just to return NULL.
*/
#include <stdio.h>
#include "stdiom.h"
#define MIN(x, y) (x < y ? x : y)
extern int _filbuf();
extern char *memccpy();
char *
fgets(ptr, size, iop)
char *ptr;
register int size;
register FILE *iop;
{
char *p, *ptr0 = ptr;
register int n;
if ( !(iop->_flag & (_IOREAD|_IORW)) ) {
iop->_flag |= _IOERR;
return (NULL);
}
for (size--; size > 0; size -= n) {
if (iop->_cnt <= 0) { /* empty buffer */
if (_filbuf(iop) == EOF) {
if (ptr0 == ptr)
return (NULL);
break; /* no more data */
}
iop->_ptr--;
iop->_cnt++;
}
n = MIN(size, iop->_cnt);
if ((p = memccpy(ptr, (char *) iop->_ptr, '\n', n)) != NULL)
n = p - ptr;
ptr += n;
iop->_cnt -= n;
iop->_ptr += n;
_BUFSYNC(iop);
if (p != NULL)
break; /* found '\n' in buffer */
}
*ptr = '\0';
return (ptr0);
}
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