src/glue.c

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved.
   4  *
   5  * @APPLE_LICENSE_HEADER_START@
   6  *
   7  * This file contains Original Code and/or Modifications of Original Code
   8  * as defined in and that are subject to the Apple Public Source License
   9  * Version 2.0 (the 'License'). You may not use this file except in
  10  * compliance with the License. Please obtain a copy of the License at
  11  * http://www.opensource.apple.com/apsl/ and read it before using this
  12  * file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  19  * Please see the License for the specific language governing rights and
  20  * limitations under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <notify.h>
  30 #include <time.h>
  31
  32 //
  33 // Stub functions needed for dyld to link with libc.a instead of libSystem.dylib
  34 //
  35 //
  36 static char* dyld_progname = "dyld";
  37
  38 //
  39 // libc has calls to _dyld_lookup_and_bind to find args and environment.  Since
  40 // dyld links with a staic copy of libc, those calls need to find dyld's args and env
  41 // not the host process.  We implement a special _dyld_lookup_and_bind() that
  42 // just knows how to bind the few symbols needed by dyld.
  43 //
  44 void _dyld_lookup_and_bind(const char* symbolName, void** address, void* module)
  45 {
  46         if ( strcmp(symbolName, "_environ") == 0 ) {
  47                 // dummy up empty environment list
  48                 static char *p = NULL;
  49                 static char **pp = &p;
  50                 *address = &pp;
  51                 return;
  52         }
  53         else if ( strcmp(symbolName, "___progname") == 0 ) {
  54                 *address = &dyld_progname;
  55                 return;
  56         }
  57
  58         fprintf(stderr, "dyld: internal error: unknown symbol '%s'\n", symbolName);
  59 }
  60
  61
  62 int NSIsSymbolNameDefined(const char* symbolName)
  63 {
  64         if ( strcmp(symbolName, "___progname") == 0 ) {
  65                 return 1;
  66         }
  67         fprintf(stderr, "dyld: internal error: unknown symbol '%s'\n", symbolName);
  68         return 0;
  69 }
  70
  71
  72 /*
  73  * To avoid linking in libm.  These variables are defined as they are used in
  74  * pthread_init() to put in place a fast sqrt().
  75  */
  76 size_t hw_sqrt_len = 0;
  77
  78 double
  79 sqrt(double x)
  80 {
  81         return(0.0);
  82 }
  83 double
  84 hw_sqrt(double x)
  85 {
  86         return(0.0);
  87 }
  88
  89 /*
  90  * More stubs to avoid linking in libm.  This works as along as we don't use
  91  * long doubles.
  92  */
  93 long
  94 __fpclassifyd(double x)
  95 {
  96         return(0);
  97 }
  98
  99 long
 100 __fpclassify(long double x)
 101 {
 102         return(0);
 103 }
 104
 105
 106 char* __hdtoa(double d, const char *xdigs, int ndigits, int *decpt, int *sign, char **rve)
 107 {
 108         return NULL;
 109 }
 110
 111 char* __hldtoa(/*long*/ double e, const char *xdigs, int ndigits, int *decpt, int *sign, char **rve)
 112 {
 113         return NULL;
 114 }
 115
 116 int __fegetfltrounds(void)
 117 {
 118        return 1;                                       /* FE_NEAREST */
 119 }
 120
 121 /*
 122  * We have our own localtime() to avoid needing the notify API which is used
 123  * by the code in libc.a for localtime() but is in libnotify.
 124  */
 125 struct tm* localtime(const time_t* t)
 126 {
 127         return (struct tm*)NULL;
 128 }
 129