1 /** @file 2 3 Copyright (c) 2011, Intel Corporation. All rights reserved.<BR> 4 This program and the accompanying materials are licensed and made available under 5 the terms and conditions of the BSD License that accompanies this distribution. 6 The full text of the license may be found at 7 http://opensource.org/licenses/bsd-license. 8 9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 12 * Copyright (c) 1990, 1993 13 * The Regents of the University of California. All rights reserved. 14 * 15 * This code is derived from software contributed to Berkeley by 16 * Chris Torek. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 3. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 42 NetBSD: findfp.c,v 1.23 2006/10/07 21:40:46 thorpej Exp 43 findfp.c 8.2 (Berkeley) 1/4/94 44 **/ 45 #include <LibConfig.h> 46 #include <sys/EfiCdefs.h> 47 48 #include "namespace.h" 49 #include <sys/param.h> 50 #include <stdio.h> 51 #include <errno.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include "reentrant.h" 56 #include "local.h" 57 #include "glue.h" 58 #include <MainData.h> 59 60 int __sdidinit; 61 62 #define NDYNAMIC 10 /* add ten more whenever necessary */ 63 64 #define std(flags, file) \ 65 /* p r w flags file bf lfbsize cookie close */ \ 66 { NULL, 0, 0, flags, file, { NULL, 0 }, 0, __sF + file, __sclose, \ 67 /* read seek write ext up */ \ 68 __sread, __sseek, __swrite, { (void *)(__sFext + file), 0 }, NULL, \ 69 /* ur ubuf, nbuf lb blksize offset */ \ 70 0, { '\0', '\0', '\0' }, { '\0' }, { NULL, 0 }, 0, (fpos_t)0 } 71 72 /* the usual - (stdin + stdout + stderr) */ 73 static FILE usual[FOPEN_MAX - 3]; 74 static struct __sfileext usualext[FOPEN_MAX - 3]; 75 static struct glue uglue = { 0, FOPEN_MAX - 3, usual }; 76 77 #if defined(_REENTRANT) && !defined(__lint__) /* XXX lint is busted */ 78 #define STDEXT { ._lock = MUTEX_INITIALIZER, ._lockcond = COND_INITIALIZER } 79 struct __sfileext __sFext[3] = { STDEXT, 80 STDEXT, 81 STDEXT}; 82 #else 83 struct __sfileext __sFext[3]; 84 #endif 85 86 FILE __sF[3] = { 87 std(__SRD, STDIN_FILENO), /* stdin */ 88 std(__SWR, STDOUT_FILENO), /* stdout */ 89 std(__SWR|__SNBF, STDERR_FILENO) /* stderr */ 90 }; 91 struct glue __sglue = { &uglue, 3, __sF }; 92 93 static struct glue *moreglue(int); 94 void f_prealloc(void); 95 96 #ifdef _REENTRANT 97 rwlock_t __sfp_lock = RWLOCK_INITIALIZER; 98 #endif 99 100 static struct glue * 101 moreglue(int n) 102 { 103 struct glue *g; 104 FILE *p; 105 struct __sfileext *pext; 106 static FILE empty; 107 108 g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE) 109 + n * sizeof(struct __sfileext)); 110 if (g == NULL) 111 return (NULL); 112 p = (FILE *)ALIGN((g + 1)); 113 g->next = NULL; 114 g->niobs = n; 115 g->iobs = p; 116 pext = (void *)(p + n); 117 while (--n >= 0) { 118 *p = empty; 119 _FILEEXT_SETUP(p, pext); 120 p++; 121 pext++; 122 } 123 return (g); 124 } 125 126 /* 127 * Find a free FILE for fopen et al. 128 */ 129 FILE * 130 __sfp() 131 { 132 FILE *fp; 133 int n; 134 struct glue *g; 135 136 if (!__sdidinit) 137 __sinit(); 138 139 rwlock_wrlock(&__sfp_lock); 140 for (g = &__sglue;; g = g->next) { 141 for (fp = g->iobs, n = g->niobs; --n >= 0; fp++) 142 if (fp->_flags == 0) 143 goto found; 144 if (g->next == NULL && (g->next = moreglue(NDYNAMIC)) == NULL) 145 break; 146 } 147 rwlock_unlock(&__sfp_lock); 148 return (NULL); 149 found: 150 fp->_flags = 1; /* reserve this slot; caller sets real flags */ 151 fp->_p = NULL; /* no current pointer */ 152 fp->_w = 0; /* nothing to read or write */ 153 fp->_r = 0; 154 fp->_bf._base = NULL; /* no buffer */ 155 fp->_bf._size = 0; 156 fp->_lbfsize = 0; /* not line buffered */ 157 fp->_file = -1; /* no file */ 158 /* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */ 159 _UB(fp)._base = NULL; /* no ungetc buffer */ 160 _UB(fp)._size = 0; 161 fp->_lb._base = NULL; /* no line buffer */ 162 fp->_lb._size = 0; 163 memset(WCIO_GET(fp), 0, sizeof(struct wchar_io_data)); 164 rwlock_unlock(&__sfp_lock); 165 return (fp); 166 } 167 168 #if 0 169 /* 170 * XXX. Force immediate allocation of internal memory. Not used by stdio, 171 * but documented historically for certain applications. Bad applications. 172 */ 173 void 174 f_prealloc() 175 { 176 struct glue *g; 177 int n; 178 179 n = (int)sysconf(_SC_OPEN_MAX) - FOPEN_MAX + 20; /* 20 for slop. */ 180 for (g = &__sglue; (n -= g->niobs) > 0 && g->next; g = g->next) 181 /* void */; 182 if (n > 0) 183 g->next = moreglue(n); 184 } 185 #endif 186 187 /* 188 * exit() calls _cleanup() through *gMD->cleanup, set whenever we 189 * open or buffer a file. This chicanery is done so that programs 190 * that do not use stdio need not link it all in. 191 * 192 * The name `_cleanup' is, alas, fairly well known outside stdio. 193 */ 194 void 195 _cleanup( void ) 196 { 197 /* (void) _fwalk(fclose); */ 198 (void) fflush(NULL); /* `cheating' */ 199 } 200 201 /* 202 * __sinit() is called whenever stdio's internal variables must be set up. 203 */ 204 void 205 __sinit( void ) 206 { 207 int i; 208 209 for (i = 0; i < FOPEN_MAX - 3; i++) 210 _FILEEXT_SETUP(&usual[i], &usualext[i]); 211 212 /* make sure we clean up on exit */ 213 gMD->cleanup = _cleanup; /* conservative */ 214 __sdidinit = 1; 215 } 216
