| 1 | /*␊ |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.␊ |
| 7 | * ␊ |
| 8 | * This file contains Original Code and/or Modifications of Original Code␊ |
| 9 | * as defined in and that are subject to the Apple Public Source License␊ |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
| 11 | * compliance with the License. Please obtain a copy of the License at␊ |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this␊ |
| 13 | * file.␊ |
| 14 | * ␊ |
| 15 | * The Original Code and all software distributed under the License are␊ |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
| 20 | * Please see the License for the specific language governing rights and␊ |
| 21 | * limitations under the License.␊ |
| 22 | * ␊ |
| 23 | * @APPLE_LICENSE_HEADER_END@␊ |
| 24 | */␊ |
| 25 | /*␊ |
| 26 | * Copyright (c) 1990, 1993␊ |
| 27 | *␉The Regents of the University of California. All rights reserved.␊ |
| 28 | *␊ |
| 29 | * This code is derived from software contributed to Berkeley by␊ |
| 30 | * Chris Torek.␊ |
| 31 | *␊ |
| 32 | * Redistribution and use in source and binary forms, with or without␊ |
| 33 | * modification, are permitted provided that the following conditions␊ |
| 34 | * are met:␊ |
| 35 | * 1. Redistributions of source code must retain the above copyright␊ |
| 36 | * notice, this list of conditions and the following disclaimer.␊ |
| 37 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 38 | * notice, this list of conditions and the following disclaimer in the␊ |
| 39 | * documentation and/or other materials provided with the distribution.␊ |
| 40 | * 3. All advertising materials mentioning features or use of this software␊ |
| 41 | * must display the following acknowledgement:␊ |
| 42 | *␉This product includes software developed by the University of␊ |
| 43 | *␉California, Berkeley and its contributors.␊ |
| 44 | * 4. Neither the name of the University nor the names of its contributors␊ |
| 45 | * may be used to endorse or promote products derived from this software␊ |
| 46 | * without specific prior written permission.␊ |
| 47 | *␊ |
| 48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
| 49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
| 50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
| 51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
| 52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
| 53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
| 54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
| 55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
| 56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
| 57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
| 58 | * SUCH DAMAGE.␊ |
| 59 | */␊ |
| 60 | ␊ |
| 61 | ␊ |
| 62 | #include <sys/param.h>␊ |
| 63 | #include <unistd.h>␊ |
| 64 | #include <stdio.h>␊ |
| 65 | #include <errno.h>␊ |
| 66 | #include <stdlib.h>␊ |
| 67 | #include <string.h>␊ |
| 68 | #include "local.h"␊ |
| 69 | #include "glue.h"␊ |
| 70 | ␊ |
| 71 | int␉__sdidinit = 0;␊ |
| 72 | void␉(*__cleanup)(void);␊ |
| 73 | ␊ |
| 74 | #define␉NDYNAMIC 10␉␉/* add ten more whenever necessary */␊ |
| 75 | ␊ |
| 76 | #define␉std(flags, file) \␊ |
| 77 | {0,0,0,flags,file,{0},0,__sF+file,__sclose,__sread,__sseek,__swrite}␊ |
| 78 | /*␉ p r w flags file _bf z cookie close read seek write */␊ |
| 79 | ␊ |
| 80 | /* the usual - (stdin + stdout + stderr) */␊ |
| 81 | static FILE usual[FOPEN_MAX - 3];␊ |
| 82 | static struct glue uglue = { 0, FOPEN_MAX - 3, usual };␊ |
| 83 | ␊ |
| 84 | FILE __sF[3] = {␊ |
| 85 | ␉std(__SRD, STDIN_FILENO),␉␉/* stdin */␊ |
| 86 | ␉std(__SWR, STDOUT_FILENO),␉␉/* stdout */␊ |
| 87 | ␉std(__SWR|__SNBF, STDERR_FILENO)␉/* stderr */␊ |
| 88 | };␊ |
| 89 | struct glue __sglue = { &uglue, 3, __sF };␊ |
| 90 | ␊ |
| 91 | FILE *__stdinp = &__sF[0];␊ |
| 92 | FILE *__stdoutp = &__sF[1];␊ |
| 93 | FILE *__stderrp = &__sF[2];␊ |
| 94 | ␊ |
| 95 | static struct glue *␊ |
| 96 | moreglue(n)␊ |
| 97 | register int n;␊ |
| 98 | {␊ |
| 99 | ␉register struct glue *g;␊ |
| 100 | ␉register FILE *p;␊ |
| 101 | ␉static FILE empty;␊ |
| 102 | ␉␊ |
| 103 | ␉g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE));␊ |
| 104 | ␉if (g == NULL)␊ |
| 105 | ␉␉return (NULL);␊ |
| 106 | ␉p = (FILE *)ALIGN(g + 1);␊ |
| 107 | ␉g->next = NULL;␊ |
| 108 | ␉g->niobs = n;␊ |
| 109 | ␉g->iobs = p;␊ |
| 110 | ␉while (--n >= 0)␊ |
| 111 | ␉␉*p++ = empty;␊ |
| 112 | ␉return (g);␊ |
| 113 | }␊ |
| 114 | ␊ |
| 115 | /*␊ |
| 116 | * Find a free FILE for fopen et al.␊ |
| 117 | */␊ |
| 118 | FILE *␊ |
| 119 | __sfp(int count /* only for a compatibility issue */)␊ |
| 120 | {␊ |
| 121 | ␉register FILE *fp;␊ |
| 122 | ␉register int n;␊ |
| 123 | ␉register struct glue *g;␊ |
| 124 | ␉␊ |
| 125 | ␉(void)count;␊ |
| 126 | ␉␊ |
| 127 | ␉if (!__sdidinit)␊ |
| 128 | ␉␉__sinit();␊ |
| 129 | ␉for (g = &__sglue;; g = g->next) {␊ |
| 130 | ␉␉for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)␊ |
| 131 | ␉␉␉if (fp->_flags == 0)␊ |
| 132 | ␉␉␉␉goto found;␊ |
| 133 | ␉␉if (g->next == NULL && (g->next = moreglue(NDYNAMIC)) == NULL)␊ |
| 134 | ␉␉␉break;␊ |
| 135 | ␉}␊ |
| 136 | ␉return (NULL);␊ |
| 137 | found:␊ |
| 138 | ␉fp->_flags = 1;␉␉/* reserve this slot; caller sets real flags */␊ |
| 139 | ␉fp->_p = NULL;␉␉/* no current pointer */␊ |
| 140 | ␉fp->_w = 0;␉␉/* nothing to read or write */␊ |
| 141 | ␉fp->_r = 0;␊ |
| 142 | ␉fp->_bf._base = NULL;␉/* no buffer */␊ |
| 143 | ␉fp->_bf._size = 0;␊ |
| 144 | ␉fp->_lbfsize = 0;␉/* not line buffered */␊ |
| 145 | ␉fp->_file = -1;␉␉/* no file */␊ |
| 146 | ␉/*␉fp->_cookie = <any>; */␉/* caller sets cookie, _read/_write etc */␊ |
| 147 | ␉fp->_ub._base = NULL;␉/* no ungetc buffer */␊ |
| 148 | ␉fp->_ub._size = 0;␊ |
| 149 | ␉fp->_lb._base = NULL;␉/* no line buffer */␊ |
| 150 | ␉fp->_lb._size = 0;␊ |
| 151 | ␉return (fp);␊ |
| 152 | }␊ |
| 153 | ␊ |
| 154 | /*␊ |
| 155 | * Mark as free and update count as needed␊ |
| 156 | */␊ |
| 157 | __private_extern__ void␊ |
| 158 | __sfprelease(FILE *fp)␊ |
| 159 | {␊ |
| 160 | ␉if (fp->_counted) {␉␉␊ |
| 161 | ␉␉fp->_counted = 0;␊ |
| 162 | ␉}␊ |
| 163 | ␉fp->_flags = 0;␊ |
| 164 | }␊ |
| 165 | ␊ |
| 166 | /*␊ |
| 167 | * exit() calls _cleanup() through *__cleanup, set whenever we␊ |
| 168 | * open or buffer a file. This chicanery is done so that programs␊ |
| 169 | * that do not use stdio need not link it all in.␊ |
| 170 | *␊ |
| 171 | * The name `_cleanup' is, alas, fairly well known outside stdio.␊ |
| 172 | */␊ |
| 173 | ␊ |
| 174 | void␊ |
| 175 | _cleanup(void)␊ |
| 176 | {␊ |
| 177 | ␉/* (void) _fwalk(fclose); */␊ |
| 178 | ␉(void) _fwalk(__sflush);␉␉/* `cheating' */␊ |
| 179 | }␊ |
| 180 | ␊ |
| 181 | /*␊ |
| 182 | * __sinit() is called whenever stdio's internal variables must be set up.␊ |
| 183 | */␊ |
| 184 | void␊ |
| 185 | __sinit(void)␊ |
| 186 | {␊ |
| 187 | ␉if (__sdidinit == 0) {␊ |
| 188 | ␉␉/* make sure we clean up on exit */␊ |
| 189 | ␉␉__cleanup = _cleanup;␉␉/* conservative */␊ |
| 190 | ␉␉__sdidinit = 1;␊ |
| 191 | ␉}␊ |
| 192 | }␊ |
| 193 | |
