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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #include "uv.h"
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23 #include "internal.h"
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24
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25 static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno);
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26
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27
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28 int uv_dlopen(const char* filename, uv_lib_t* lib) {
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29 WCHAR filename_w[32768];
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30 ssize_t r;
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31
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32 lib->handle = NULL;
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33 lib->errmsg = NULL;
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34
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35 r = uv_wtf8_length_as_utf16(filename);
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36 if (r < 0)
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37 return uv__dlerror(lib, filename, ERROR_NO_UNICODE_TRANSLATION);
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38 if ((size_t) r > ARRAY_SIZE(filename_w))
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39 return uv__dlerror(lib, filename, ERROR_INSUFFICIENT_BUFFER);
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40 uv_wtf8_to_utf16(filename, filename_w, r);
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41
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42 lib->handle = LoadLibraryExW(filename_w, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
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43 if (lib->handle == NULL) {
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44 return uv__dlerror(lib, filename, GetLastError());
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45 }
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46
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47 return 0;
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48 }
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49
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50
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51 void uv_dlclose(uv_lib_t* lib) {
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52 if (lib->errmsg) {
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53 LocalFree((void*)lib->errmsg);
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54 lib->errmsg = NULL;
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55 }
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56
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57 if (lib->handle) {
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58 /* Ignore errors. No good way to signal them without leaking memory. */
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59 FreeLibrary(lib->handle);
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60 lib->handle = NULL;
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61 }
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62 }
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63
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64
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65 int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
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66 /* Cast though integer to suppress pedantic warning about forbidden cast. */
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67 *ptr = (void*)(uintptr_t) GetProcAddress(lib->handle, name);
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68 return uv__dlerror(lib, "", *ptr ? 0 : GetLastError());
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69 }
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70
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71
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72 const char* uv_dlerror(const uv_lib_t* lib) {
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73 return lib->errmsg ? lib->errmsg : "no error";
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74 }
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75
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76
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77 static void uv__format_fallback_error(uv_lib_t* lib, int errorno){
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78 static const CHAR fallback_error[] = "error: %1!d!";
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79 DWORD_PTR args[1];
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80 args[0] = (DWORD_PTR) errorno;
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81
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82 FormatMessageA(FORMAT_MESSAGE_FROM_STRING |
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83 FORMAT_MESSAGE_ARGUMENT_ARRAY |
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84 FORMAT_MESSAGE_ALLOCATE_BUFFER,
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85 fallback_error, 0, 0,
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86 (LPSTR) &lib->errmsg,
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87 0, (va_list*) args);
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88 }
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89
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90
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91
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92 static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno) {
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93 DWORD_PTR arg;
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94 DWORD res;
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95 char* msg;
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96
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97 if (lib->errmsg) {
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98 LocalFree(lib->errmsg);
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99 lib->errmsg = NULL;
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100 }
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101
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102 if (errorno == 0)
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103 return 0;
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104
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105 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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106 FORMAT_MESSAGE_FROM_SYSTEM |
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107 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
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108 MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
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109 (LPSTR) &lib->errmsg, 0, NULL);
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110
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111 if (!res && (GetLastError() == ERROR_MUI_FILE_NOT_FOUND ||
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112 GetLastError() == ERROR_RESOURCE_TYPE_NOT_FOUND)) {
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113 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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114 FORMAT_MESSAGE_FROM_SYSTEM |
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115 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
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116 0, (LPSTR) &lib->errmsg, 0, NULL);
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117 }
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118
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119 if (res && errorno == ERROR_BAD_EXE_FORMAT && strstr(lib->errmsg, "%1")) {
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120 msg = lib->errmsg;
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121 lib->errmsg = NULL;
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122 arg = (DWORD_PTR) filename;
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123 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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124 FORMAT_MESSAGE_ARGUMENT_ARRAY |
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125 FORMAT_MESSAGE_FROM_STRING,
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126 msg,
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127 0, 0, (LPSTR) &lib->errmsg, 0, (va_list*) &arg);
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128 LocalFree(msg);
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129 }
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130
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131 if (!res)
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132 uv__format_fallback_error(lib, errorno);
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133
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134 return -1;
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135 }
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