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annotate src/SDL_loadso.c @ 294:d2d48e10f370

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Added a new header file: SDL_loadso.h It contains the following functions: SDL_LoadObject(), SDL_LoadFunction(), SDL_UnloadObject() The UNIX esd and arts audio code use these to dynamically load their respective audio libraries.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 06 Mar 2002 05:20:11 +0000
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children fab1ddc4d7bf
rev   line source
294
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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29 /* System dependent library loading routines */
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30
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31 #include <stdio.h>
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32 #if defined(USE_DLOPEN)
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33 # include <dlfcn.h>
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34 #elif defined(WIN32)
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35 # include <windows.h>
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36 #elif defined(__BEOS__)
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37 # include <be/kernel/image.h>
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38 #elif defined(macintosh)
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39 # include <string.h>
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40 # include <Strings.h>
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41 # include <CodeFragments.h>
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42 # include <Errors.h>
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43 #else
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44 /*#error Unsupported dynamic link environment*/
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45 #endif /* system type */
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46
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47 #include "SDL_error.h"
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48 #include "SDL_loadso.h"
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49
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50 void *SDL_LoadObject(const char *sofile)
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51 {
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52 void *handle = NULL;
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53 const char *loaderror = "SDL_LoadObject() not implemented";
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54 #if defined(USE_DLOPEN)
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55 /* * */
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56 handle = dlopen(sofile, RTLD_NOW);
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57 loaderror = (char *)dlerror();
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58 #elif defined(WIN32)
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59 /* * */
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60 char errbuf[512];
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61
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62 handle = (void *)LoadLibrary(sofile);
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63
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64 /* Generate an error message if all loads failed */
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65 if ( handle == NULL ) {
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66 FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
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67 FORMAT_MESSAGE_FROM_SYSTEM),
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68 NULL, GetLastError(),
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69 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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70 errbuf, SDL_TABLESIZE(errbuf), NULL);
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71 loaderror = errbuf;
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72 }
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73 #elif defined(__BEOS__)
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74 /* * */
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75 image_id library_id;
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76
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77 library_id = load_add_on(sofile);
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78 if ( library_id == B_ERROR ) {
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79 loaderror = "BeOS error";
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80 } else {
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81 handle = (void *)(library_id);
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82 }
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83 #elif defined(macintosh)
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84 /* * */
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85 CFragConnectionID library_id;
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86 Ptr mainAddr;
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87 Str255 errName;
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88 OSErr error;
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89 char psofile[512];
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90
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91 strncpy(psofile, sofile, SDL_TABLESIZE(psofile));
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92 psofile[SDL_TABLESIZE(psofile)-1] = '\0';
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93 error = GetSharedLibrary(C2PStr(psofile), kCompiledCFragArch,
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94 kLoadCFrag, &library_id, &mainAddr, errName);
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95 switch (error) {
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96 case noErr:
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97 break;
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98 case cfragNoLibraryErr:
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99 loaderror = "Library not found";
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100 break;
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101 case cfragUnresolvedErr:
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102 loaderror = "Unabled to resolve symbols";
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103 break;
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104 case cfragNoPrivateMemErr:
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105 case cfragNoClientMemErr:
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106 loaderror = "Out of memory";
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107 break;
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108 default:
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109 loaderror = "Unknown Code Fragment Manager error";
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110 break;
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111 }
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112 if ( loaderror == NULL ) {
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113 handle = (void *)(library_id);
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114 }
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115 #endif /* system type */
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116
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117 if ( handle == NULL ) {
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118 SDL_SetError("Failed loading %s: %s", sofile, loaderror);
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119 }
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120 return(handle);
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121 }
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122
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123 void *SDL_LoadFunction(void *handle, const char *name)
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124 {
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125 void *symbol = NULL;
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126 const char *loaderror = "SDL_LoadFunction not implemented";
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127 #if defined(USE_DLOPEN)
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128 /* * */
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129 symbol = dlsym(handle, name);
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130 if ( symbol == NULL ) {
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131 loaderror = (char *)dlerror();
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132 }
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133 #elif defined(WIN32)
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134 /* * */
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135 char errbuf[512];
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136
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137 symbol = (void *)GetProcAddress((HMODULE)handle, name);
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138 if ( symbol == NULL ) {
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139 FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
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140 FORMAT_MESSAGE_FROM_SYSTEM),
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141 NULL, GetLastError(),
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142 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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143 errbuf, SDL_TABLESIZE(errbuf), NULL);
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144 loaderror = errbuf;
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145 }
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146 #elif defined(__BEOS__)
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147 /* * */
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148 image_id library_id = (image_id)handle;
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149 if ( get_image_symbol(library_id,
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150 name, B_SYMBOL_TYPE_TEXT, &symbol) != B_NO_ERROR ) {
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151 loaderror = "Symbol not found";
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152 }
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153 #elif defined(macintosh)
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154 /* * */
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155 CFragSymbolClass class;
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156 CFragConnectionID library_id = (CFragConnectionID)handle;
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157 char pname[512];
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158
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159 strncpy(pname, name, SDL_TABLESIZE(pname));
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160 pname[SDL_TABLESIZE(pname)-1] = '\0';
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161 if ( FindSymbol(library_id, C2PStr(pname),
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162 (char **)&symbol, &class) != noErr ) {
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163 loaderror = "Symbol not found";
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164 }
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165 #endif /* system type */
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166
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167 if ( symbol == NULL ) {
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168 SDL_SetError("Failed loading %s: %s", name, loaderror);
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169 }
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170 return(symbol);
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171 }
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172
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173 void SDL_UnloadObject(void *handle)
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174 {
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175 if ( handle == NULL ) {
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176 return;
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177 }
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178 #if defined(USE_DLOPEN)
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179 /* * */
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180 dlclose(handle);
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181 #elif defined(WIN32)
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182 /* * */
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183 FreeLibrary((HMODULE)handle);
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184 #elif defined(__BEOS__)
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185 /* * */
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186 image_id library_id = (image_id)handle;
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187 unload_add_on(library_id);
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188 #elif defined(macintosh)
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189 /* * */
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190 CFragConnectionID library_id = (CFragConnectionID)handle;
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191 CloseConnection(library_id);
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192 #endif /* system type */
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193 }