Converting text files from Windows to Linux in C

Hello everyone. For my C study exercise, I wrote a program under Linux that converts any text file from Unix format to Windows (it involves changing the line terminator from LF to CRLF and vice versa) and vice versa. Now I have brought this code back to Windows and I have recompiled it. Unfortunately, I can't do the text file conversion step from Windows to Linux (CRLF to LF) here.
The written code is attached below.
Can you help me solve this problem ?

Can you show where you open the file to read it?

You need to set stdout to binary mode. On Windows in text mode an output stream automatically writes a '\r' before every '\n'; an input stream in text mode ignores a '\r' before a '\n'. Binary mode doesn't transform line endings. On linux, text mode is the same as binary mode, so linux sees the '\r' before every '\n' with windows line endings.

Code:

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#ifdef _WIN32
  #include <io.h>
  #include <fcntl.h>
#endif
 
// in main:
#ifdef _WIN32
    setmode(fileno(stdout), O_BINARY);
#endif

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thanks john.c, I found on the Microsoft site that you have to use:

Code:

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_setmode(_fileno(stdout), _O_BINARY);

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obviously using between

Code:

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#if (_WIN32) and #endif

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in fact it works correctly.