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 #include "lint.h" 31 #include "file64.h" 32 #include "mtlib.h" 33 #include <sys/types.h> 34 #include <stdio.h> 35 #include <memory.h> 36 #include <thread.h> 37 #include <synch.h> 38 #include <errno.h> 39 #include "stdiom.h" 40 #include "mse.h" 41 42 /* read a single line from stdin, replace the '\n' with '\0' */ 43 char * 44 gets(char *buf) 45 { 46 char *ptr = buf; 47 ssize_t n; 48 char *p; 49 Uchar *bufend; 50 rmutex_t *lk; 51 52 FLOCKFILE(lk, stdin); 53 54 _SET_ORIENTATION_BYTE(stdin); 55 56 if (!(stdin->_flag & (_IOREAD | _IORW))) { 57 errno = EBADF; 58 FUNLOCKFILE(lk); 59 return (0); 60 } 61 62 if (stdin->_base == NULL) { 63 if ((bufend = _findbuf(stdin)) == 0) { 64 FUNLOCKFILE(lk); 65 return (0); 66 } 67 } 68 else 69 bufend = _bufend(stdin); 70 71 for (;;) /* until get a '\n' */ 72 { 73 if (stdin->_cnt <= 0) /* empty buffer */ 74 { 75 if (__filbuf(stdin) != EOF) { 76 stdin->_ptr--; /* put back the character */ 77 stdin->_cnt++; 78 } else if (ptr == buf) { /* never read anything */ 79 FUNLOCKFILE(lk); 80 return (0); 81 } else 82 break; /* nothing left to read */ 83 } 84 n = stdin->_cnt; 85 if ((p = (char *)memccpy(ptr, (char *)stdin->_ptr, '\n', 86 (size_t)n)) != 0) 87 n = p - ptr; 88 ptr += n; 89 stdin->_cnt -= n; 90 stdin->_ptr += n; 91 if (_needsync(stdin, bufend)) 92 _bufsync(stdin, bufend); 93 if (p != 0) /* found a '\n' */ 94 { 95 ptr--; /* step back over the '\n' */ 96 break; 97 } 98 } 99 *ptr = '\0'; 100 FUNLOCKFILE(lk); 101 return (buf); 102 } 103