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