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786 |
skrzyp |
//==========================================================================
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//
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// tmpfile.c
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//
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// Make a temporary data file for test purposes
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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// ####BSDALTCOPYRIGHTBEGIN####
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// -------------------------------------------
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// Portions of this software may have been derived from FreeBSD, OpenBSD,
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// or other sources, and if so are covered by the appropriate copyright
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// and license included herein.
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// -------------------------------------------
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// ####BSDALTCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): hmt
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// Contributors: hmt
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// Date: 2000-10-23
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include <stdio.h>
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#include <errno.h>
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int main( int argc, char **argv )
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{
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FILE *f;
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int i;
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unsigned int size, iirandom, z, csum;
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char sizec, scratchc;
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if ( 3 > argc || 4 < argc) {
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usage:
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fprintf( stderr, "usage: %s filename length [seed]\n", argv[0] );
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exit(1);
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}
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f = fopen( argv[1], "rb" );
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if ( f ) {
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fclose( f );
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fprintf( stderr, "File %s already exists\n", argv[1] );
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goto usage;
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}
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i = sscanf( argv[2], "%u%1c%1c", &size, &sizec, &scratchc );
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if ( 0 >= i || 2 < i )
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goto usage;
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if ( 2 == i )
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switch ( sizec ) {
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case 'G': size *= 1024;
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case 'M': size *= 1024;
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case 'k': size *= 1024;
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break;
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case 'b': size *= 512;
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break;
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default:
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goto usage;
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}
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iirandom = 0;
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if ( 4 == argc ) {
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i = sscanf( argv[3], "%u%1c", &iirandom, &scratchc );
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if ( 0 >= i || 1 < i )
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goto usage;
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}
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f = fopen( argv[1], "wb" );
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if ( !f ) {
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perror( "fopen [create]" );
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goto usage;
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}
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csum = 0;
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iirandom += 0x23164920; // What date said
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if ( size > 4 ) i = size-4; else i = size;
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for ( /* i */ ; i > 0; i-- ) {
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iirandom = iirandom * 91 + 137;
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iirandom ^= iirandom >> 14 | iirandom << 7;
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z = (i ^ iirandom) & 0xff;
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// Keep a simple checksum in case we make some trick to check it in
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// the pretend filesystem.
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csum += z;
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csum = (csum >> (z & 31)) ^ (csum << (32 - (z & 31)));
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if ( 0 > putc( z, f ) ) {
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perror( "putc" );
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fclose( f );
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exit( 1 );
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}
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}
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// And bung the checksum on the end.
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for ( i = 4 ; i < size && i > 0; i-- ) {
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z = csum & 0xff;
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csum >>= 8;
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if ( 0 > putc( z, f ) ) {
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perror( "putc" );
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fclose( f );
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exit( 1 );
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}
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}
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fclose( f );
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exit( 0 );
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}
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// EOF awaitorder.c
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