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 /* Copyright (c) 1984 AT&T */ 23 /* All Rights Reserved */ 24 25 #pragma ident "%Z%%M% %I% %E% SMI" 26 27 /*LINTLIBRARY*/ 28 /* 29 * This version reads directly from the buffer rather than looping on getc. 30 * Ptr args aren't checked for NULL because the program would be a 31 * catastrophic mess anyway. Better to abort than just to return NULL. 32 */ 33 #include <stdio.h> 34 #include "stdiom.h" 35 #include <memory.h> 36 37 extern int _filbuf(); 38 39 char * gets(char * ptr)40gets(char *ptr) 41 { 42 char *p, *ptr0 = ptr; 43 int n; 44 45 for ( ; ; ) { 46 if (stdin->_cnt <= 0) { /* empty buffer */ 47 if (_filbuf(stdin) == EOF) { 48 if (ptr0 == ptr) 49 return (NULL); 50 break; /* no more data */ 51 } 52 stdin->_ptr--; 53 stdin->_cnt++; 54 } 55 n = stdin->_cnt; 56 if ((p = memccpy(ptr, (char *) stdin->_ptr, '\n', n)) != NULL) 57 n = p - ptr; 58 ptr += n; 59 stdin->_cnt -= n; 60 stdin->_ptr += n; 61 _BUFSYNC(stdin); 62 if (p != NULL) { /* found '\n' in buffer */ 63 ptr--; /* step back over '\n' */ 64 break; 65 } 66 } 67 *ptr = '\0'; 68 return (ptr0); 69 } 70