Ticket #2189: read-vs-readfile.c

#include <io.h>
#include <stdio.h>
#include <windows.h>
void perrorWin32();

int main() {
        char buf[1];
        HANDLE hStdin;
        DWORD mode;
        DWORD got;

        // Setting terminal to raw mode...
        hStdin = GetStdHandle(STD_INPUT_HANDLE);

        if (GetFileType(hStdin) == FILE_TYPE_CHAR) {
                GetConsoleMode(hStdin, &mode);
                if (
                        !SetConsoleMode(
                                hStdin,
                                mode & ~(ENABLE_LINE_INPUT|ENABLE_ECHO_INPUT))
                ) {
                        perrorWin32();
                        return 1;
                }
        }

        // Using a POSIX API

        got = read(0, buf, 1);
        if (got < 0)
                perror(NULL);
        else if (got == 0)
                printf("Got nothing\n");
        else
                printf("'%c' %d\n", buf[0], buf[0]);

        // Using the Windows API

        if (!ReadFile(hStdin, buf, 1, &got, NULL))
                perrorWin32();
        else if (got < 1)
                printf("Got nothing\n");
        else
                printf("'%c' %d\n", buf[0], buf[0]);

        return 0;
}

void perrorWin32() {
        LPTSTR message;
        DWORD err = GetLastError();

        FormatMessage(
                FORMAT_MESSAGE_ALLOCATE_BUFFER |
                FORMAT_MESSAGE_FROM_SYSTEM |
                FORMAT_MESSAGE_IGNORE_INSERTS,
                NULL,
                err,
                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                (LPTSTR)&message,
                0, NULL);

        printf("error code %lu: %s", err, message);
        LocalFree(message);
}