#include <fcntl.h>
#include <unistd.h>
-_PDCLIB_fd_t _PDCLIB_open( char const * const filename, unsigned int mode )
+#include "/usr/include/errno.h"
+
+int _PDCLIB_open( char const * const filename, unsigned int mode )
{
- /* 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.
+ /* This is an example implementation of _PDCLIB_open() fit for use with
+ POSIX kernels.
+ FIXME: The permissions of newly created files should not be hardcoded
+ here.
*/
int osmode;
switch ( mode & ~_PDCLIB_FBIN )
osmode = O_WRONLY | O_CREAT | O_TRUNC;
break;
case _PDCLIB_FAPPEND: /* "a" */
- osmode = O_APPEND | O_CREAT;
+ osmode = O_WRONLY | O_APPEND | O_CREAT;
break;
case _PDCLIB_FREAD | _PDCLIB_FRW: /* "r+" */
osmode = O_RDWR;
default: /* Invalid mode */
return -1;
}
+ int rc;
if ( osmode & O_CREAT )
{
- return open( filename, osmode, S_IRUSR | S_IWUSR );
+ rc = open( filename, osmode, S_IRUSR | S_IWUSR );
}
else
{
- return open( filename, osmode );
+ rc = open( filename, osmode );
+ }
+ if ( rc == -1 )
+ {
+ switch ( errno )
+ {
+ case EACCES:
+ case EFAULT:
+ case EINTR:
+ case EISDIR:
+ case ELOOP:
+ case EMFILE:
+ case ENAMETOOLONG:
+ case ENFILE:
+ case ENODEV:
+ case ENOENT:
+ case ENOMEM:
+ case ENOSPC:
+ case ENOTDIR:
+ case EOVERFLOW:
+ case EROFS:
+ case ETXTBSY:
+ _PDCLIB_errno = _PDCLIB_EIO;
+ default:
+ _PDCLIB_errno = _PDCLIB_EUNKNOWN;
+ }
}
+ return rc;
}
#endif
#include <_PDCLIB_test.h>
#include <stdlib.h>
+#include <string.h>
int main( void )
{
/* This testdriver assumes POSIX, i.e. _PDCLIB_fd_t being int and being
incremented by one on each successful open.
*/
- _PDCLIB_fd_t fh;
- TESTCASE( _PDCLIB_open( "testfile2", _PDCLIB_FREAD ) == _PDCLIB_NOHANDLE );
- TESTCASE( ( fh = _PDCLIB_open( "testfile1", _PDCLIB_FWRITE ) ) != _PDCLIB_NOHANDLE );
+ int fh;
+ char buffer[ 10 ];
+ remove( "testfile" );
+ /* 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( close( fh ) == 0 );
- TESTCASE( _PDCLIB_open( "testfile1", _PDCLIB_FREAD ) != _PDCLIB_NOHANDLE );
- system( "rm testfile1" );
+ TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
+ TESTCASE( read( fh, buffer, 4 ) == -1 );
+ TESTCASE( _PDCLIB_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( _PDCLIB_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( _PDCLIB_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( _PDCLIB_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( _PDCLIB_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( _PDCLIB_close( fh ) == 0 );
+ /* Cleaning up. */
+ TESTCASE( remove( "testfile" ) == 0 );
return TEST_RESULTS;
}
#endif
+