/* $Id$ */
-/* Release $Name$ */
-
/* fopen( const char *, const char * )
This file is part of the Public Domain C Library (PDCLib).
#ifndef REGTEST
#include <_PDCLIB_glue.h>
+#include <string.h>
-static const FILE * _PDCLIB_filelist = NULL;
+extern struct _PDCLIB_file_t * _PDCLIB_filelist;
-static int filemode( char const * const mode )
+struct _PDCLIB_file_t * fopen( const char * _PDCLIB_restrict filename, const char * _PDCLIB_restrict mode )
{
- int rc = 0;
- switch ( mode[0] )
+ struct _PDCLIB_file_t * rc;
+ size_t filename_len;
+ if ( mode == NULL || filename == NULL || filename[0] == '\0' )
{
- case 'r':
- rc |= _PDCLIB_FREAD;
- break;
- case 'w':
- rc |= _PDCLIB_FWRITE;
- break;
- case 'a':
- rc |= _PDCLIB_FAPPEND;
- break;
- default:
- return -1;
+ /* Mode or filename invalid */
+ return NULL;
}
- for ( size_t i = 1; i < 4; ++i )
+ /* 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 = strlen( filename ) + 1;
+ if ( ( rc = calloc( 1, sizeof( struct _PDCLIB_file_t ) + _PDCLIB_UNGETCBUFSIZE + filename_len + BUFSIZ ) ) == NULL )
{
- switch ( mode[1] )
- {
- case '+':
- if ( rc & _PDCLIB_FRW ) return -1;
- rc |= _PDCLIB_FRW;
- break;
- case 'b':
- if ( rc & _PDCLIB_FBIN ) return -1;
- rc |= _PDCLIB_FBIN;
- break;
- case '\0':
- return rc;
- default:
- return -1;
- }
+ /* no memory */
+ return NULL;
}
- return -1;
-}
-
-FILE * fopen( const char * _PDCLIB_restrict filename, const char * _PDCLIB_restrict mode )
-{
- FILE * rc;
- if ( mode == NULL || filename == NULL || filename[0] == '\0' )
+ if ( ( rc->status = _PDCLIB_filemode( mode ) ) == 0 )
+ {
+ /* invalid mode */
+ free( rc );
+ return NULL;
+ }
+ rc->handle = _PDCLIB_open( filename, rc->status );
+ if ( rc->handle == _PDCLIB_NOHANDLE )
{
+ /* OS open() failed */
+ free( rc );
return NULL;
}
- if ( ( rc = calloc( 1, sizeof( FILE ) ) ) == NULL ) return rc; /* no space for another FILE */
- if ( ( rc->status = filemode( mode ) ) == -1 ) goto fail; /* invalid mode given */
- if ( ( rc->handle = _PDCLIB_open( filename, rc->status ) ) == -1 ) goto fail; /* OS "open" failed */
+ /* 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 */
+ 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;
- /* TODO: Continue here: Set up PDCLib FILE contents */
return rc;
-fail:
- free( rc );
- return NULL;
}
#endif
int main( void )
{
- TESTCASE( NO_TESTDRIVER );
+ /* 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).
+ */
+ 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( fopen( "testfile", "w" ) != NULL );
+ remove( "testfile" );
return TEST_RESULTS;
}