[Tinycc-devel] how to get Unix style line endings for output (just \n not \r\n) --- works when writing to a file, not when redirecting stdout on command line

[John Refling]

I’m writing binary data to a file.  The data may contain 0xa ( = \n, NL, ^J ).

When I open the output file within the program with ` fopen("file", "wb");’ the data is

written correctly.  Of course using “w” without the “b” causes hex 0xa to be pre-pended

with 0xd ( = \r, CR, ^M) corrupting the data, as expected, so must use “wb”.  That’s fine.

However, if within the program I write the data to stdout, and then on command line

redirect stdout to my file, the file seems to always contain the undesired 0xd (^M) characters.

e.g.: .\example > file

I’ve tried a few things from standard Unix like freopen() fdopen() but nothing seemed to help.

Is there some way to redirect purely binary (raw) data to stdout without having extra bytes

inserted into the output stream?

What is __imp__fmode hook in tinycc?  Maybe that would help?

John Refling

PS: Using cygwin bash shell but also same output under cmd.exe

EXAMPLE.C FOLLOWS:

// includes and prototypes

#include <stdio.h>

#include <stdlib.h>

#include <sys/unistd.h>

#include <string.h>

#include <errno.h>

#include <sys/stat.h>

#include <sys/fcntl.h>

#include <ctype.h>

#include <fcntl.h>

// is there a way to use this to change output mode???

extern unsigned int * __imp__fmode;

int main(int argc, char **argv) {

//      *__imp__fmode = 3;                      // ????

        char *buffer_nl = "test\n";

        char *buffer_xx = "test";

//      // ^M tacked onto lines in file `file' (as expected)

//      FILE *F = fopen("file", "w");

//      fprintf(F, buffer_nl);

       

//      // no ^M tacked onto lines in file `file' (as expected)

//      FILE *F = fopen("file", "wb");

//      fprintf(F, buffer_nl);

       

        // i want output to redirect stdout from here on...

        // this is where ^M seems to be ALWAYS added

//      // .\example.exe > redir, `redir' has ^M tacked onto lines

//      fprintf(stdout, buffer_nl);

//      // .\example.exe > redir, `redir' no newline in buffer, no ^M tacked

//      fprintf(stdout, buffer_xx);

        // some segfault under tcc, not under gcc

//      FILE *F = freopen("nul:", "wb", stdout);                // nothing in file

//      FILE *F = freopen("tty:", "wb", stdout);                // segfault

//      FILE *F = freopen(NULL, "wb", stdout);          // segfault

//      FILE *F = freopen("", "wb", stdout);            // segfault

//      FILE *F = freopen("con:", "wb", stdout);                // can't redirect this

//      fprintf(F, buffer_nl);

       

//      // .\example.exe > redir, `redir' has ^M tacked onto lines

//      FILE *F = fdopen(1, "wb");     

        FILE *F = fdopen(1, "wt");     

        fprintf(F, buffer_nl);

        return 0;

}