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 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #include "synonyms.h" 34 #include "file64.h" 35 #include "mtlib.h" 36 #include <stdio.h> 37 #include <memory.h> 38 #include <errno.h> 39 #include <thread.h> 40 #include <synch.h> 41 #include <sys/types.h> 42 #include "stdiom.h" 43 #include "mse.h" 44 45 /* read size-max line from stream, including '\n' */ 46 char * 47 fgets(char *buf, int size, FILE *iop) 48 { 49 char *ptr = buf; 50 int n; 51 Uchar *bufend; 52 char *p; 53 rmutex_t *lk; 54 55 FLOCKFILE(lk, iop); 56 57 _SET_ORIENTATION_BYTE(iop); 58 59 if (!(iop->_flag & (_IOREAD | _IORW))) { 60 errno = EBADF; 61 FUNLOCKFILE(lk); 62 return (NULL); 63 } 64 65 if (iop->_base == NULL) { 66 if ((bufend = _findbuf(iop)) == NULL) { 67 FUNLOCKFILE(lk); 68 return (NULL); 69 } 70 } 71 else 72 bufend = _bufend(iop); 73 74 size--; /* room for '\0' */ 75 while (size > 0) { 76 /* empty buffer */ 77 if (iop->_cnt <= 0) { 78 if (__filbuf(iop) != EOF) { 79 iop->_ptr--; /* put back the character */ 80 iop->_cnt++; 81 } else if (ptr == buf) { /* never read anything */ 82 FUNLOCKFILE(lk); 83 return (NULL); 84 } else 85 break; /* nothing left to read */ 86 } 87 n = (int)(size < iop->_cnt ? size : iop->_cnt); 88 if ((p = memccpy(ptr, (char *)iop->_ptr, '\n', 89 (size_t)n)) != NULL) 90 n = (int)(p - ptr); 91 ptr += n; 92 iop->_cnt -= n; 93 iop->_ptr += n; 94 if (_needsync(iop, bufend)) 95 _bufsync(iop, bufend); 96 if (p != NULL) 97 break; /* newline found */ 98 size -= n; 99 } 100 FUNLOCKFILE(lk); 101 *ptr = '\0'; 102 return (buf); 103 } 104