/* $Id$ */

/* _PDCLIB_fvopen( _PDCLIB_fd_t fd, _PDCLIB_fileops_t *  )

   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

#include <stdio.h>
#include <stdlib.h>

#ifndef REGTEST
#include <_PDCLIB_glue.h>
#include <string.h>
#include <threads.h>

extern struct _PDCLIB_file_t * _PDCLIB_filelist;

struct _PDCLIB_file_t * _PDCLIB_fvopen( _PDCLIB_fd_t               fd, 
                                        const _PDCLIB_fileops_t *  ops,
                                        int mode,
                                        const char * _PDCLIB_restrict filename )
{
    size_t filename_len;
    struct _PDCLIB_file_t * rc;
    if ( mode == NULL )
    {
        /* Mode invalid */
        return NULL;
    }
    /* To reduce the number of malloc calls, all data fields are concatenated:
       * the FILE structure itself,
       * ungetc buffer,
       * filename buffer,
       * data buffer.
       Data buffer comes last because it might change in size ( setvbuf() ).
    */
    filename_len = filename ? strlen( filename ) + 1 : 1;
    if ( ( rc = calloc( 1, sizeof( struct _PDCLIB_file_t ) + _PDCLIB_UNGETCBUFSIZE + filename_len + BUFSIZ ) ) == NULL )
    {
        /* no memory */
        return NULL;
    }

    if(mtx_init(&rc->lock, mtx_recursive) != thrd_success) {
        free(rc);
        return NULL;
    }

    rc->status = mode;
    rc->ops    = ops;
    rc->handle = fd;
    /* Setting pointers into the memory block allocated above */
    rc->ungetbuf = (unsigned char *)rc + sizeof( struct _PDCLIB_file_t );
    rc->filename = (char *)rc->ungetbuf + _PDCLIB_UNGETCBUFSIZE;
    rc->buffer   = rc->filename + filename_len;
    /* Copying filename to FILE structure */
    if(filename) strcpy( rc->filename, filename );
    /* Initializing the rest of the structure */
    rc->bufsize = BUFSIZ;
    rc->bufidx = 0;
    rc->ungetidx = 0;
    /* Setting buffer to _IOLBF because "when opened, a stream is fully
       buffered if and only if it can be determined not to refer to an
       interactive device."
    */
    rc->status |= _IOLBF;
    /* TODO: Setting mbstate */
    /* Adding to list of open files */
    rc->next = _PDCLIB_filelist;
    _PDCLIB_filelist = rc;
    return rc;
}

#endif

#ifdef TEST
#include <_PDCLIB_test.h>

int main( void )
{
    /* Some of the tests are not executed for regression tests, as the libc on
       my system is at once less forgiving (segfaults on mode NULL) and more
       forgiving (accepts undefined modes).
    */
    FILE * fh;
    remove( testfile );
    TESTCASE_NOREG( fopen( NULL, NULL ) == NULL );
    TESTCASE( fopen( NULL, "w" ) == NULL );
    TESTCASE_NOREG( fopen( "", NULL ) == NULL );
    TESTCASE( fopen( "", "w" ) == NULL );
    TESTCASE( fopen( "foo", "" ) == NULL );
    TESTCASE_NOREG( fopen( testfile, "wq" ) == NULL ); /* Undefined mode */
    TESTCASE_NOREG( fopen( testfile, "wr" ) == NULL ); /* Undefined mode */
    TESTCASE( ( fh = fopen( testfile, "w" ) ) != NULL );
    TESTCASE( fclose( fh ) == 0 );
    TESTCASE( remove( testfile ) == 0 );
    return TEST_RESULTS;
}

#endif