/* $Id$ */
-/* Release $Name$ */
-
/* _PDCLIB_open( char const * const, int )
This file is part of the Public Domain C Library (PDCLib).
#include <fcntl.h>
#include <unistd.h>
-_PDCLIB_fd_t _PDCLIB_open( char const * const filename, int mode )
+_PDCLIB_fd_t _PDCLIB_open( char const * const filename, unsigned int mode )
{
- int osmode = 0;
- if ( mode & _PDCLIB_FRW ) osmode |= O_RDWR;
- if ( mode & ( _PDCLIB_FWRITE | _PDCLIB_FAPPEND ) ) osmode |= O_CREAT;
- if ( mode & _PDCLIB_FWRITE ) osmode |= O_TRUNC;
- if ( mode & _PDCLIB_FAPPEND ) osmode |= O_APPEND;
- if ( ( mode & _PDCLIB_FREAD ) && ! ( mode & _PDCLIB_FRW ) ) osmode |= O_RDONLY;
- return open( filename, osmode );
+ /* FIXME: THIS IS NOT TO BE USED OUT-OF-THE-BOX.
+ It is a proof-of-concept implementation. E.g. a stream may only be fully
+ buffered IF IT CAN BE DETERMINED NOT TO REFER TO AN INTERACTIVE DEVICE.
+ This logic is not represented here, as this is the EXAMPLE platform, and
+ actual platform overlays may differ widely. Another point is the value
+ for permissions being hardcoded to 0664 for file creations.
+ */
+ int osmode;
+ switch ( mode & ~_PDCLIB_FBIN )
+ {
+ case _PDCLIB_FREAD: /* "r" */
+ osmode = O_RDONLY;
+ break;
+ case _PDCLIB_FWRITE: /* "w" */
+ osmode = O_WRONLY | O_CREAT | O_TRUNC;
+ break;
+ case _PDCLIB_FAPPEND: /* "a" */
+ osmode = O_WRONLY | O_APPEND | O_CREAT;
+ break;
+ case _PDCLIB_FREAD | _PDCLIB_FRW: /* "r+" */
+ osmode = O_RDWR;
+ break;
+ case _PDCLIB_FWRITE | _PDCLIB_FRW: /* "w+" */
+ osmode = O_RDWR | O_CREAT | O_TRUNC;
+ break;
+ case _PDCLIB_FAPPEND | _PDCLIB_FRW: /* "a+" */
+ osmode = O_RDWR | O_APPEND | O_CREAT;
+ break;
+ default: /* Invalid mode */
+ return -1;
+ }
+ if ( osmode & O_CREAT )
+ {
+ return open( filename, osmode, S_IRUSR | S_IWUSR );
+ }
+ else
+ {
+ return open( filename, osmode );
+ }
}
#endif
#ifdef TEST
#include <_PDCLIB_test.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <errno.h>
+
int main( void )
{
- TESTCASE( NO_TESTDRIVER );
+ /* This testdriver assumes POSIX, i.e. _PDCLIB_fd_t being int and being
+ incremented by one on each successful open.
+ */
+ _PDCLIB_fd_t fh;
+ char buffer[ 10 ];
+ /* Trying to read non-existent file. */
+ TESTCASE( _PDCLIB_open( "testfile", _PDCLIB_FREAD ) == _PDCLIB_NOHANDLE );
+ /* Writing to file, trying to read from it. */
+ TESTCASE( ( fh = _PDCLIB_open( "testfile", _PDCLIB_FWRITE ) ) != _PDCLIB_NOHANDLE );
+ TESTCASE( write( fh, "test", 4 ) == 4 );
+ TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
+ TESTCASE( read( fh, buffer, 4 ) == -1 );
+ TESTCASE( close( fh ) == 0 );
+ /* Reading from file, trying to write to it. */
+ TESTCASE( ( fh = _PDCLIB_open( "testfile", _PDCLIB_FREAD ) ) != _PDCLIB_NOHANDLE );
+ TESTCASE( write( fh, "test", 4 ) == -1 );
+ TESTCASE( close( fh ) == 0 );
+ /* Appending to file, trying to read from it. */
+ TESTCASE( ( fh = _PDCLIB_open( "testfile", _PDCLIB_FAPPEND ) ) != _PDCLIB_NOHANDLE );
+ TESTCASE( write( fh, "app", 3 ) == 3 );
+ TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
+ TESTCASE( read( fh, buffer, 10 ) == -1 );
+ TESTCASE( write( fh, "end", 3 ) == 3 );
+ TESTCASE( close( fh ) == 0 );
+ /* Reading and writing from file ("r+"). */
+ TESTCASE( ( fh = _PDCLIB_open( "testfile", _PDCLIB_FREAD | _PDCLIB_FRW ) ) != _PDCLIB_NOHANDLE );
+ TESTCASE( read( fh, buffer, 10 ) == 10 );
+ TESTCASE( memcmp( buffer, "testappend", 10 ) == 0 );
+ TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
+ TESTCASE( write( fh, "wedo", 4 ) == 4 );
+ TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
+ TESTCASE( read( fh, buffer, 10 ) == 10 );
+ TESTCASE( memcmp( buffer, "wedoappend", 10 ) == 0 );
+ TESTCASE( close( fh ) == 0 );
+ /* Writing and reading from file ("w+"). */
+ TESTCASE( ( fh = _PDCLIB_open( "testfile", _PDCLIB_FWRITE | _PDCLIB_FRW ) ) != _PDCLIB_NOHANDLE );
+ TESTCASE( write( fh, "test", 4 ) == 4 );
+ TESTCASE( lseek( fh, 1, SEEK_SET ) == 1 );
+ TESTCASE( read( fh, buffer, 2 ) == 2 );
+ TESTCASE( memcmp( buffer, "es", 2 ) == 0 );
+ TESTCASE( write( fh, "sie", 3 ) == 3 );
+ TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
+ TESTCASE( read( fh, buffer, 6 ) == 6 );
+ TESTCASE( memcmp( buffer, "tessie", 6 ) == 0 );
+ TESTCASE( close( fh ) == 0 );
+ /* Appending and reading from file ("a+"). */
+ TESTCASE( ( fh = _PDCLIB_open( "testfile", _PDCLIB_FAPPEND | _PDCLIB_FRW ) ) != _PDCLIB_NOHANDLE );
+ TESTCASE( write( fh, "baby", 4 ) == 4 );
+ TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
+ TESTCASE( read( fh, buffer, 10 ) == 10 );
+ TESTCASE( memcmp( buffer, "tessiebaby", 10 ) == 0 );
+ TESTCASE( close( fh ) == 0 );
+ /* Cleaning up. */
+ system( "rm testfile" );
return TEST_RESULTS;
}