1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22 #include "uv.h"
23 #include "internal.h"
24
25 static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno);
26
27
uv_dlopen(const char * filename,uv_lib_t * lib)28 int uv_dlopen(const char* filename, uv_lib_t* lib) {
29 WCHAR filename_w[32768];
30
31 lib->handle = NULL;
32 lib->errmsg = NULL;
33
34 if (!MultiByteToWideChar(CP_UTF8,
35 0,
36 filename,
37 -1,
38 filename_w,
39 ARRAY_SIZE(filename_w))) {
40 return uv__dlerror(lib, filename, GetLastError());
41 }
42
43 lib->handle = LoadLibraryExW(filename_w, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
44 if (lib->handle == NULL) {
45 return uv__dlerror(lib, filename, GetLastError());
46 }
47
48 return 0;
49 }
50
51
uv_dlclose(uv_lib_t * lib)52 void uv_dlclose(uv_lib_t* lib) {
53 if (lib->errmsg) {
54 LocalFree((void*)lib->errmsg);
55 lib->errmsg = NULL;
56 }
57
58 if (lib->handle) {
59 /* Ignore errors. No good way to signal them without leaking memory. */
60 FreeLibrary(lib->handle);
61 lib->handle = NULL;
62 }
63 }
64
65
uv_dlsym(uv_lib_t * lib,const char * name,void ** ptr)66 int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
67 /* Cast though integer to suppress pedantic warning about forbidden cast. */
68 *ptr = (void*)(uintptr_t) GetProcAddress(lib->handle, name);
69 return uv__dlerror(lib, "", *ptr ? 0 : GetLastError());
70 }
71
72
uv_dlerror(const uv_lib_t * lib)73 const char* uv_dlerror(const uv_lib_t* lib) {
74 return lib->errmsg ? lib->errmsg : "no error";
75 }
76
77
uv__format_fallback_error(uv_lib_t * lib,int errorno)78 static void uv__format_fallback_error(uv_lib_t* lib, int errorno){
79 static const CHAR fallback_error[] = "error: %1!d!";
80 DWORD_PTR args[1];
81 args[0] = (DWORD_PTR) errorno;
82
83 FormatMessageA(FORMAT_MESSAGE_FROM_STRING |
84 FORMAT_MESSAGE_ARGUMENT_ARRAY |
85 FORMAT_MESSAGE_ALLOCATE_BUFFER,
86 fallback_error, 0, 0,
87 (LPSTR) &lib->errmsg,
88 0, (va_list*) args);
89 }
90
91
92
uv__dlerror(uv_lib_t * lib,const char * filename,DWORD errorno)93 static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno) {
94 DWORD_PTR arg;
95 DWORD res;
96 char* msg;
97
98 if (lib->errmsg) {
99 LocalFree(lib->errmsg);
100 lib->errmsg = NULL;
101 }
102
103 if (errorno == 0)
104 return 0;
105
106 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
107 FORMAT_MESSAGE_FROM_SYSTEM |
108 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
109 MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
110 (LPSTR) &lib->errmsg, 0, NULL);
111
112 if (!res && (GetLastError() == ERROR_MUI_FILE_NOT_FOUND ||
113 GetLastError() == ERROR_RESOURCE_TYPE_NOT_FOUND)) {
114 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
115 FORMAT_MESSAGE_FROM_SYSTEM |
116 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
117 0, (LPSTR) &lib->errmsg, 0, NULL);
118 }
119
120 if (res && errorno == ERROR_BAD_EXE_FORMAT && strstr(lib->errmsg, "%1")) {
121 msg = lib->errmsg;
122 lib->errmsg = NULL;
123 arg = (DWORD_PTR) filename;
124 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
125 FORMAT_MESSAGE_ARGUMENT_ARRAY |
126 FORMAT_MESSAGE_FROM_STRING,
127 msg,
128 0, 0, (LPSTR) &lib->errmsg, 0, (va_list*) &arg);
129 LocalFree(msg);
130 }
131
132 if (!res)
133 uv__format_fallback_error(lib, errorno);
134
135 return -1;
136 }
137