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 <sys/types.h> 37 #include <stdio.h> 38 #include <values.h> 39 #include <memory.h> 40 #include <thread.h> 41 #include <synch.h> 42 #include <unistd.h> 43 #include "stdiom.h" 44 #include "mse.h" 45 46 size_t 47 _fwrite_unlocked(const void *ptr, size_t size, size_t count, FILE *iop); 48 49 size_t 50 fwrite(const void *ptr, size_t size, size_t count, FILE *iop) 51 { 52 rmutex_t *lk; 53 size_t retval; 54 55 FLOCKFILE(lk, iop); 56 57 _SET_ORIENTATION_BYTE(iop); 58 59 retval = _fwrite_unlocked(ptr, size, count, iop); 60 FUNLOCKFILE(lk); 61 62 return (retval); 63 } 64 65 size_t 66 _fwrite_unlocked(const void *ptr, size_t size, size_t count, FILE *iop) 67 { 68 ssize_t s, n; 69 unsigned char *dptr = (unsigned char *)ptr; 70 unsigned char *bufend; 71 72 if (_WRTCHK(iop)) 73 return (0); 74 75 /* 76 * This test is here to avoid the expensive multiply 77 */ 78 if (count == 1) 79 s = size; 80 else if (size == 1) 81 s = count; 82 else 83 s = size * count; 84 85 if (iop->_flag & _IOLBF) { 86 bufend = _bufend(iop); 87 iop->_cnt = iop->_base - iop->_ptr; 88 while (s > 0) { 89 ssize_t buflen = bufend - iop->_base; 90 if (--iop->_cnt >= (-buflen) && *dptr != '\n') 91 *iop->_ptr++ = *dptr++; 92 else if (__flsbuf(*dptr++, iop) == EOF) 93 break; 94 s--; 95 } 96 } else if (iop->_flag & _IONBF) { 97 ssize_t bytes; 98 ssize_t written = 0; 99 char *data; 100 101 if (size < 1 || count < 1) 102 return (0); 103 104 if (iop->_base != iop->_ptr) { 105 /* 106 * Flush any existing data. Doesn't count towards return 107 * value. 108 */ 109 bytes = iop->_ptr - iop->_base; 110 data = (char *)iop->_base; 111 112 while ((n = write(fileno(iop), data, (size_t)bytes)) 113 != bytes) { 114 if (n == -1) { 115 iop->_flag |= _IOERR; 116 return (0); 117 } else { 118 data += n; 119 bytes -= n; 120 } 121 } 122 iop->_cnt = 0; 123 iop->_ptr = iop->_base; 124 } 125 /* 126 * written is in bytes until the return. 127 * Then it is divided by size to produce items. 128 */ 129 while ((n = write(fileno(iop), dptr, s)) != s) { 130 if (n == -1) { 131 iop->_flag |= _IOERR; 132 return (written / size); 133 } else { 134 dptr += n; 135 s -= n; 136 written += n; 137 } 138 } 139 written += n; 140 return (written / size); 141 } else while (s > 0) { 142 if (iop->_cnt < s) { 143 if (iop->_cnt > 0) { 144 (void) memcpy(iop->_ptr, (void *)dptr, 145 iop->_cnt); 146 dptr += iop->_cnt; 147 iop->_ptr += iop->_cnt; 148 s -= iop->_cnt; 149 } 150 if (_xflsbuf(iop) == EOF) 151 break; 152 } 153 if (iop->_cnt >= s) { 154 char *tmp = (char *)iop->_ptr; 155 156 switch (s) { 157 case 8: 158 *tmp++ = *dptr++; 159 /*FALLTHRU*/ 160 case 7: 161 *tmp++ = *dptr++; 162 /*FALLTHRU*/ 163 case 6: 164 *tmp++ = *dptr++; 165 /*FALLTHRU*/ 166 case 5: 167 *tmp++ = *dptr++; 168 /*FALLTHRU*/ 169 case 4: 170 *tmp++ = *dptr++; 171 /*FALLTHRU*/ 172 case 3: 173 *tmp++ = *dptr++; 174 /*FALLTHRU*/ 175 case 2: 176 *tmp++ = *dptr++; 177 /*FALLTHRU*/ 178 case 1: 179 *tmp++ = *dptr++; 180 break; 181 case 0: 182 return (count); 183 default: 184 (void) memcpy(iop->_ptr, (void *)dptr, s); 185 } 186 iop->_ptr += s; 187 iop->_cnt -= s; 188 189 return (count); 190 } 191 } 192 193 return (size != 0 ? count - ((s + size - 1) / size) : 0); 194 } 195