Using constants for testfile names

[fw/pdclib] / platform / example / functions / _PDCLIB / open.c

diff --git a/platform/example/functions/_PDCLIB/open.c b/platform/example/functions/_PDCLIB/open.c
index b0b26cb582c0dd0360e069a216f5d2a12f4e0e09..0230558c9ccc4aea4f907f44b985232cbb4cb18e 100644 (file)
--- a/platform/example/functions/_PDCLIB/open.c
+++ b/platform/example/functions/_PDCLIB/open.c
@@ -20,15 +20,72 @@
 #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 )
 {
-    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 );
+    /* This is an example implementation of _PDCLIB_open() fit for use with
+       POSIX kernels.
+    */
+    int osmode;
+    switch ( mode & ( _PDCLIB_FREAD | _PDCLIB_FWRITE | _PDCLIB_FAPPEND | _PDCLIB_FRW ) )
+    {
+        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;
+    }
+    int rc;
+    if ( osmode & O_CREAT )
+    {
+        rc = open( filename, osmode, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH );
+    }
+    else
+    {
+        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
@@ -36,10 +93,68 @@ _PDCLIB_fd_t _PDCLIB_open( char const * const filename, unsigned int mode )
 #ifdef TEST
 #include <_PDCLIB_test.h>
 
+#include <stdlib.h>
+#include <string.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.
+    */
+    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( 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
+