1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1989 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 3.3 */ 31 32 /*LINTLIBRARY*/ 33 /* 34 * This version reads directly from the buffer rather than looping on getc. 35 * Ptr args aren't checked for NULL because the program would be a 36 * catastrophic mess anyway. Better to abort than just to return NULL. 37 */ 38 #include <stdio.h> 39 #include "stdiom.h" 40 41 #define MIN(x, y) (x < y ? x : y) 42 43 extern int _filbuf(); 44 extern char *memccpy(); 45 46 char * 47 fgets(ptr, size, iop) 48 char *ptr; 49 register int size; 50 register FILE *iop; 51 { 52 char *p, *ptr0 = ptr; 53 register int n; 54 55 if ( !(iop->_flag & (_IOREAD|_IORW)) ) { 56 iop->_flag |= _IOERR; 57 return (NULL); 58 } 59 60 for (size--; size > 0; size -= n) { 61 if (iop->_cnt <= 0) { /* empty buffer */ 62 if (_filbuf(iop) == EOF) { 63 if (ptr0 == ptr) 64 return (NULL); 65 break; /* no more data */ 66 } 67 iop->_ptr--; 68 iop->_cnt++; 69 } 70 n = MIN(size, iop->_cnt); 71 if ((p = memccpy(ptr, (char *) iop->_ptr, '\n', n)) != NULL) 72 n = p - ptr; 73 ptr += n; 74 iop->_cnt -= n; 75 iop->_ptr += n; 76 _BUFSYNC(iop); 77 if (p != NULL) 78 break; /* found '\n' in buffer */ 79 } 80 *ptr = '\0'; 81 return (ptr0); 82 } 83