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81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
#include "getusername.h"
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#include <errno.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <unistd.h>
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#include <string>
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using namespace std;
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const string utf8 = "UTF-8";
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// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724432(v=vs.85).aspx
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// Sets errno to:
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// ERROR_BAD_ENVIRONMENT - locale is not UTF-8
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// ERROR_TOO_MANY_OPEN_FILES - already have the maximum allowed number of open files
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// ERROR_NO_ASSOCIATION - calling process has no controlling terminal
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// ERROR_INSUFFICIENT_BUFFER - buffer not large enough to hold username string
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// ERROR_NO_SUCH_USER - there was no corresponding entry in the utmp-file
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// ERROR_OUTOFMEMORY - insufficient memory to allocate passwd structure
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// ERROR_NO_ASSOCIATION - standard input didn't refer to a terminal
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// ERROR_INVALID_FUNCTION - getlogin_r() returned an unrecognized error code
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//
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// Returns:
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// 1 - succeeded
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// 0 - failed
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BOOL GetUserName(WCHAR_T* lpBuffer, LPDWORD lpnSize)
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{
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errno = 0;
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// Select locale from environment
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setlocale(LC_ALL, "");
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// Check that locale is UTF-8
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if (nl_langinfo(CODESET) != utf8) {
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errno = ERROR_BAD_ENVIRONMENT;
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return 0;
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}
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// Get username from system in a thread-safe manner
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char userName[*lpnSize];
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int err = getlogin_r(userName, *lpnSize);
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// Map errno to Win32 Error Codes
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if (err != 0) {
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switch (errno) {
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case EMFILE:
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case ENFILE:
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errno = ERROR_TOO_MANY_OPEN_FILES;
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break;
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case ENXIO:
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errno = ERROR_NO_ASSOCIATION;
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break;
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case ERANGE:
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errno = ERROR_INSUFFICIENT_BUFFER;
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break;
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case ENOENT:
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errno = ERROR_NO_SUCH_USER;
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break;
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case ENOMEM:
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errno = ERROR_OUTOFMEMORY;
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break;
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case ENOTTY:
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errno = ERROR_NO_ASSOCIATION;
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break;
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default:
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errno = ERROR_INVALID_FUNCTION;
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}
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return 0;
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}
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// TODO: Convert to char* to wchar* (UTF-8 to UTF-16 LE w/o BOM)
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// Unfortunately codecvt is not yet supported by G++, othwerise:
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// wstring_convert<std::codecvt_utf8_utf16<char16_t>,char16_t> conversion;
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// TODO: Use PAL's Unicode converters
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// TODO: set the lpnSize to the userName length (see msdn)
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return 1;
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}
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