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//===========================================================================

//

//      fopen.cxx

//

//      Implementation of C library file open function as per ANSI 7.9.5.3

//

//===========================================================================

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// -------------------------------------------

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// or inline functions from this file, or you compile this file and link it

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//####ECOSGPLCOPYRIGHTEND####

//===========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-20

// Purpose:       Implements ISO C fopen() function

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

//===========================================================================

// CONFIGURATION

#include <pkgconf/libc_stdio.h>   // Configuration header

// Do we want fopen()?

#if defined(CYGPKG_LIBC_STDIO_OPEN)

// INCLUDES

#include <cyg/infra/cyg_type.h>     // Common project-wide type definitions

#include <stddef.h>                 // NULL and size_t from compiler

#include <errno.h>                  // Error codes

#include <stdio.h>                  // header for fopen()

#include <stdlib.h>                 // malloc()

#include <string.h>                 // strncmp() and strcmp()

#include <cyg/libc/stdio/stdiofiles.hxx> // C library files

#include <cyg/libc/stdio/stream.hxx>     // C library streams

#include <cyg/libc/stdio/io.inl>     // I/O system inlines

// FUNCTIONS

// placement new

inline void *operator new(size_t size, void *ptr)

{

    CYG_CHECK_DATA_PTR( ptr, "Bad pointer" );

    return ptr;

}

// process the mode string. Return true on error

static cyg_bool

process_mode( const char *mode, Cyg_StdioStream::OpenMode *rw,

              cyg_bool *binary, cyg_bool *append )

{

    *binary = *append = false; // default

    switch (mode[0]) {

    case 'r':

        *rw = Cyg_StdioStream::CYG_STREAM_READ;

        break;

    case 'a':

        *append = true;

    case 'w':

        *rw = Cyg_StdioStream::CYG_STREAM_WRITE;

        break;

    default:

        return true;

    } // switch

    // ANSI says additional characters may follow the sequences, that we

    // don't necessarily recognise so we just ignore them, and pretend that

    // its the end of the string

    switch (mode[1]) {

    case 'b':

        *binary = true;

        break;

    case '+':

        *rw = Cyg_StdioStream::CYG_STREAM_READWRITE;

        break;

    default:

        return false;

    } // switch

    switch (mode[2]) {

    case 'b':

        *binary = true;

        break;

    case '+':

        *rw = Cyg_StdioStream::CYG_STREAM_READWRITE;

        break;

    default:

        return false;

    } // switch

    return false;

} // process_mode()

static FILE *fopen_inner( cyg_stdio_handle_t dev,

                          Cyg_StdioStream::OpenMode open_mode,

                          cyg_bool binary,

                          cyg_bool append)

{

    Cyg_StdioStream *curr_stream;

    int i;

    Cyg_ErrNo err;

    int bufmode = _IOFBF;

    cyg_ucount32 bufsize = BUFSIZ;

    Cyg_libc_stdio_files::lock();

    // find an empty slot

    for (i=0; i < FOPEN_MAX; i++) {

        curr_stream = Cyg_libc_stdio_files::get_file_stream(i);

        if (curr_stream == NULL)

            break;

    } // for

    if (i == FOPEN_MAX) { // didn't find an empty slot

        errno = EMFILE;

        cyg_stdio_close( dev );

        return NULL;

    } // if

    // Decide the buffering mode. The default is fully buffered, but if

    // this is an interactive stream then set it to non buffered. 

    if( (dev != CYG_STDIO_HANDLE_NULL) &&

        cyg_stdio_interactive( dev ) )

        bufmode = _IONBF, bufsize = 0;

    // Allocate it some memory and construct it.

    curr_stream = (Cyg_StdioStream *)malloc(sizeof(*curr_stream));

    if (curr_stream == NULL) {

        cyg_stdio_close( dev );

        errno = ENOMEM;

        return NULL;

    } // if

    curr_stream = new ((void *)curr_stream) Cyg_StdioStream( dev, open_mode,

                                                             append, binary,

                                                             bufmode, bufsize );

    // it puts any error in its own error flag

    if (( err=curr_stream->get_error() )) {

        Cyg_libc_stdio_files::unlock();

        free( curr_stream );

        cyg_stdio_close( dev );

        errno = err;

        return NULL;

    } // if

    Cyg_libc_stdio_files::set_file_stream(i, curr_stream);

    Cyg_libc_stdio_files::unlock();

    return (FILE *)(curr_stream);

} // fopen_inner()

externC FILE *

fopen( const char *filename, const char *mode )

{

    cyg_stdio_handle_t dev;

    Cyg_ErrNo err;

    Cyg_StdioStream::OpenMode open_mode;

    cyg_bool binary, append;

    // process_mode returns true on error

    if (process_mode( mode, &open_mode, &binary, &append )) {

        errno = EINVAL;

        return NULL;

    } // if

    err = cyg_stdio_open( filename, open_mode, binary, append, &dev );

    // if not found

    if (err != ENOERR) {

        errno = ENOENT;

        return NULL;

    } // if

    return fopen_inner( dev, open_mode, binary, append );

} // fopen()

#endif // defined(CYGPKG_LIBC_STDIO_OPEN)

#ifdef CYGPKG_LIBC_STDIO_FILEIO

externC int fileno( FILE *stream )

{

    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;

    return real_stream->get_dev();

}

externC FILE *fdopen( int fd, const char *mode )

{

    Cyg_StdioStream::OpenMode open_mode;

    cyg_bool binary, append;

    FILE *f;

    // process_mode returns true on error

    if (process_mode( mode, &open_mode, &binary, &append )) {

        errno = EINVAL;

        return NULL;

    } // if

    f = fopen_inner( (cyg_stdio_handle_t)fd, open_mode, binary, append );

    if( f == NULL )

        return f;

    // Do a null seek to initialize the file position.

    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)f;

    fpos_t pos = 0;

    real_stream->set_position( pos, SEEK_CUR );

    return f;

}

#endif // def CYGPKG_LIBC_STDIO_FILEIO

// EOF fopen.cxx