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 ssize_t r;
31
32 lib->handle = NULL;
33 lib->errmsg = NULL;
34
35 r = uv_wtf8_length_as_utf16(filename);
36 if (r < 0)
37 return uv__dlerror(lib, filename, ERROR_NO_UNICODE_TRANSLATION);
38 if ((size_t) r > ARRAY_SIZE(filename_w))
39 return uv__dlerror(lib, filename, ERROR_INSUFFICIENT_BUFFER);
40 uv_wtf8_to_utf16(filename, filename_w, r);
41
42 lib->handle = LoadLibraryExW(filename_w, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
43 if (lib->handle == NULL) {
44 return uv__dlerror(lib, filename, GetLastError());
45 }
46
47 return 0;
48 }
49
50
uv_dlclose(uv_lib_t * lib)51 void uv_dlclose(uv_lib_t* lib) {
52 if (lib->errmsg) {
53 LocalFree((void*)lib->errmsg);
54 lib->errmsg = NULL;
55 }
56
57 if (lib->handle) {
58 /* Ignore errors. No good way to signal them without leaking memory. */
59 FreeLibrary(lib->handle);
60 lib->handle = NULL;
61 }
62 }
63
64
uv_dlsym(uv_lib_t * lib,const char * name,void ** ptr)65 int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
66 /* Cast though integer to suppress pedantic warning about forbidden cast. */
67 *ptr = (void*)(uintptr_t) GetProcAddress(lib->handle, name);
68 return uv__dlerror(lib, "", *ptr ? 0 : GetLastError());
69 }
70
71
uv_dlerror(const uv_lib_t * lib)72 const char* uv_dlerror(const uv_lib_t* lib) {
73 return lib->errmsg ? lib->errmsg : "no error";
74 }
75
76
uv__format_fallback_error(uv_lib_t * lib,int errorno)77 static void uv__format_fallback_error(uv_lib_t* lib, int errorno){
78 static const CHAR fallback_error[] = "error: %1!d!";
79 DWORD_PTR args[1];
80 args[0] = (DWORD_PTR) errorno;
81
82 FormatMessageA(FORMAT_MESSAGE_FROM_STRING |
83 FORMAT_MESSAGE_ARGUMENT_ARRAY |
84 FORMAT_MESSAGE_ALLOCATE_BUFFER,
85 fallback_error, 0, 0,
86 (LPSTR) &lib->errmsg,
87 0, (va_list*) args);
88 }
89
90
91
uv__dlerror(uv_lib_t * lib,const char * filename,DWORD errorno)92 static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno) {
93 DWORD_PTR arg;
94 DWORD res;
95 char* msg;
96
97 if (lib->errmsg) {
98 LocalFree(lib->errmsg);
99 lib->errmsg = NULL;
100 }
101
102 if (errorno == 0)
103 return 0;
104
105 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
106 FORMAT_MESSAGE_FROM_SYSTEM |
107 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
108 MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
109 (LPSTR) &lib->errmsg, 0, NULL);
110
111 if (!res && (GetLastError() == ERROR_MUI_FILE_NOT_FOUND ||
112 GetLastError() == ERROR_RESOURCE_TYPE_NOT_FOUND)) {
113 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
114 FORMAT_MESSAGE_FROM_SYSTEM |
115 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
116 0, (LPSTR) &lib->errmsg, 0, NULL);
117 }
118
119 if (res && errorno == ERROR_BAD_EXE_FORMAT && strstr(lib->errmsg, "%1")) {
120 msg = lib->errmsg;
121 lib->errmsg = NULL;
122 arg = (DWORD_PTR) filename;
123 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
124 FORMAT_MESSAGE_ARGUMENT_ARRAY |
125 FORMAT_MESSAGE_FROM_STRING,
126 msg,
127 0, 0, (LPSTR) &lib->errmsg, 0, (va_list*) &arg);
128 LocalFree(msg);
129 }
130
131 if (!res)
132 uv__format_fallback_error(lib, errorno);
133
134 return -1;
135 }
136
