3 /* _PDCLIB_open( char const * const, int )
5 This file is part of the Public Domain C Library (PDCLib).
6 Permission is granted to use, modify, and / or redistribute at will.
9 /* This is an example implementation of _PDCLIB_open() fit for use with POSIX
16 #include <_PDCLIB_glue.h>
18 #include <sys/types.h>
23 #include "/usr/include/errno.h"
25 int _PDCLIB_open( char const * const filename, unsigned int mode )
27 /* This is an example implementation of _PDCLIB_open() fit for use with
31 switch ( mode & ( _PDCLIB_FREAD | _PDCLIB_FWRITE | _PDCLIB_FAPPEND | _PDCLIB_FRW ) )
33 case _PDCLIB_FREAD: /* "r" */
36 case _PDCLIB_FWRITE: /* "w" */
37 osmode = O_WRONLY | O_CREAT | O_TRUNC;
39 case _PDCLIB_FAPPEND: /* "a" */
40 osmode = O_WRONLY | O_APPEND | O_CREAT;
42 case _PDCLIB_FREAD | _PDCLIB_FRW: /* "r+" */
45 case _PDCLIB_FWRITE | _PDCLIB_FRW: /* "w+" */
46 osmode = O_RDWR | O_CREAT | O_TRUNC;
48 case _PDCLIB_FAPPEND | _PDCLIB_FRW: /* "a+" */
49 osmode = O_RDWR | O_APPEND | O_CREAT;
51 default: /* Invalid mode */
55 if ( osmode & O_CREAT )
57 rc = open( filename, osmode, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH );
61 rc = open( filename, osmode );
83 _PDCLIB_errno = _PDCLIB_EIO;
85 _PDCLIB_errno = _PDCLIB_EUNKNOWN;
94 #include <_PDCLIB_test.h>
101 /* This testdriver assumes POSIX, i.e. _PDCLIB_fd_t being int and being
102 incremented by one on each successful open.
107 /* Trying to read non-existent file. */
108 TESTCASE( _PDCLIB_open( testfile, _PDCLIB_FREAD ) == _PDCLIB_NOHANDLE );
109 /* Writing to file, trying to read from it. */
110 TESTCASE( ( fh = _PDCLIB_open( testfile, _PDCLIB_FWRITE ) ) != _PDCLIB_NOHANDLE );
111 TESTCASE( write( fh, "test", 4 ) == 4 );
112 TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
113 TESTCASE( read( fh, buffer, 4 ) == -1 );
114 TESTCASE( _PDCLIB_close( fh ) == 0 );
115 /* Reading from file, trying to write to it. */
116 TESTCASE( ( fh = _PDCLIB_open( testfile, _PDCLIB_FREAD ) ) != _PDCLIB_NOHANDLE );
117 TESTCASE( write( fh, "test", 4 ) == -1 );
118 TESTCASE( _PDCLIB_close( fh ) == 0 );
119 /* Appending to file, trying to read from it. */
120 TESTCASE( ( fh = _PDCLIB_open( testfile, _PDCLIB_FAPPEND ) ) != _PDCLIB_NOHANDLE );
121 TESTCASE( write( fh, "app", 3 ) == 3 );
122 TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
123 TESTCASE( read( fh, buffer, 10 ) == -1 );
124 TESTCASE( write( fh, "end", 3 ) == 3 );
125 TESTCASE( _PDCLIB_close( fh ) == 0 );
126 /* Reading and writing from file ("r+"). */
127 TESTCASE( ( fh = _PDCLIB_open( testfile, _PDCLIB_FREAD | _PDCLIB_FRW ) ) != _PDCLIB_NOHANDLE );
128 TESTCASE( read( fh, buffer, 10 ) == 10 );
129 TESTCASE( memcmp( buffer, "testappend", 10 ) == 0 );
130 TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
131 TESTCASE( write( fh, "wedo", 4 ) == 4 );
132 TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
133 TESTCASE( read( fh, buffer, 10 ) == 10 );
134 TESTCASE( memcmp( buffer, "wedoappend", 10 ) == 0 );
135 TESTCASE( _PDCLIB_close( fh ) == 0 );
136 /* Writing and reading from file ("w+"). */
137 TESTCASE( ( fh = _PDCLIB_open( testfile, _PDCLIB_FWRITE | _PDCLIB_FRW ) ) != _PDCLIB_NOHANDLE );
138 TESTCASE( write( fh, "test", 4 ) == 4 );
139 TESTCASE( lseek( fh, 1, SEEK_SET ) == 1 );
140 TESTCASE( read( fh, buffer, 2 ) == 2 );
141 TESTCASE( memcmp( buffer, "es", 2 ) == 0 );
142 TESTCASE( write( fh, "sie", 3 ) == 3 );
143 TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
144 TESTCASE( read( fh, buffer, 6 ) == 6 );
145 TESTCASE( memcmp( buffer, "tessie", 6 ) == 0 );
146 TESTCASE( _PDCLIB_close( fh ) == 0 );
147 /* Appending and reading from file ("a+"). */
148 TESTCASE( ( fh = _PDCLIB_open( testfile, _PDCLIB_FAPPEND | _PDCLIB_FRW ) ) != _PDCLIB_NOHANDLE );
149 TESTCASE( write( fh, "baby", 4 ) == 4 );
150 TESTCASE( lseek( fh, 0, SEEK_SET ) == 0 );
151 TESTCASE( read( fh, buffer, 10 ) == 10 );
152 TESTCASE( memcmp( buffer, "tessiebaby", 10 ) == 0 );
153 TESTCASE( _PDCLIB_close( fh ) == 0 );
155 TESTCASE( remove( testfile ) == 0 );