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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include "lint.h" 33 #include "file64.h" 34 #include "mtlib.h" 35 #include <sys/types.h> 36 #include <stdio.h> 37 #include <memory.h> 38 #include <thread.h> 39 #include <synch.h> 40 #include <errno.h> 41 #include "stdiom.h" 42 #include "mse.h" 43 44 /* read a single line from stdin, replace the '\n' with '\0' */ 45 char * 46 gets(char *buf) 47 { 48 char *ptr = buf; 49 ssize_t n; 50 char *p; 51 Uchar *bufend; 52 rmutex_t *lk; 53 54 FLOCKFILE(lk, stdin); 55 56 _SET_ORIENTATION_BYTE(stdin); 57 58 if (!(stdin->_flag & (_IOREAD | _IORW))) { 59 errno = EBADF; 60 FUNLOCKFILE(lk); 61 return (0); 62 } 63 64 if (stdin->_base == NULL) { 65 if ((bufend = _findbuf(stdin)) == 0) { 66 FUNLOCKFILE(lk); 67 return (0); 68 } 69 } 70 else 71 bufend = _bufend(stdin); 72 73 for (;;) /* until get a '\n' */ 74 { 75 if (stdin->_cnt <= 0) /* empty buffer */ 76 { 77 if (__filbuf(stdin) != EOF) { 78 stdin->_ptr--; /* put back the character */ 79 stdin->_cnt++; 80 } else if (ptr == buf) { /* never read anything */ 81 FUNLOCKFILE(lk); 82 return (0); 83 } else 84 break; /* nothing left to read */ 85 } 86 n = stdin->_cnt; 87 if ((p = (char *)memccpy(ptr, (char *)stdin->_ptr, '\n', 88 (size_t)n)) != 0) 89 n = p - ptr; 90 ptr += n; 91 stdin->_cnt -= n; 92 stdin->_ptr += n; 93 if (_needsync(stdin, bufend)) 94 _bufsync(stdin, bufend); 95 if (p != 0) /* found a '\n' */ 96 { 97 ptr--; /* step back over the '\n' */ 98 break; 99 } 100 } 101 *ptr = '\0'; 102 FUNLOCKFILE(lk); 103 return (buf); 104 } 105