--- /dev/null
+/* $Id$ */
+
+/* _PDCLIB_filemode( const char * )
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+#ifndef REGTEST
+#include <_PDCLIB_io.h>
+/* Helper function that parses the C-style mode string passed to fopen() into
+ the PDCLib flags FREAD, FWRITE, FAPPEND, FRW (read-write) and FBIN (binary
+ mode).
+*/
+unsigned int _PDCLIB_filemode( char const * const mode )
+{
+ if(!mode) return 0;
+
+ unsigned rc = 0;
+ switch ( mode[0] )
+ {
+ case 'r':
+ rc |= _PDCLIB_FREAD;
+ break;
+ case 'w':
+ rc |= _PDCLIB_FWRITE;
+ break;
+ case 'a':
+ rc |= _PDCLIB_FAPPEND | _PDCLIB_FWRITE;
+ break;
+ default:
+ /* Other than read, write, or append - invalid */
+ return 0;
+ }
+ for ( size_t i = 1; i < 4; ++i )
+ {
+ switch ( mode[i] )
+ {
+ case '+':
+ if ( rc & _PDCLIB_FRW ) return 0; /* Duplicates are invalid */
+ rc |= _PDCLIB_FRW;
+ break;
+ case 'b':
+ if ( rc & _PDCLIB_FBIN ) return 0; /* Duplicates are invalid */
+ rc |= _PDCLIB_FBIN;
+ break;
+ case '\0':
+ /* End of mode */
+ return rc;
+ default:
+ /* Other than read/write or binary - invalid. */
+ return 0;
+ }
+ }
+ /* Longer than three chars - invalid. */
+ return 0;
+}
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+#ifndef REGTEST
+ TESTCASE( _PDCLIB_filemode( "r" ) == _PDCLIB_FREAD );
+ TESTCASE( _PDCLIB_filemode( "w" ) == _PDCLIB_FWRITE );
+ TESTCASE( _PDCLIB_filemode( "a" ) == ( _PDCLIB_FAPPEND | _PDCLIB_FWRITE ) );
+ TESTCASE( _PDCLIB_filemode( "r+" ) == ( _PDCLIB_FREAD | _PDCLIB_FRW ) );
+ TESTCASE( _PDCLIB_filemode( "w+" ) == ( _PDCLIB_FWRITE | _PDCLIB_FRW ) );
+ TESTCASE( _PDCLIB_filemode( "a+" ) == ( _PDCLIB_FAPPEND | _PDCLIB_FWRITE | _PDCLIB_FRW ) );
+ TESTCASE( _PDCLIB_filemode( "rb" ) == ( _PDCLIB_FREAD | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "wb" ) == ( _PDCLIB_FWRITE | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "ab" ) == ( _PDCLIB_FAPPEND | _PDCLIB_FWRITE | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "r+b" ) == ( _PDCLIB_FREAD | _PDCLIB_FRW | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "w+b" ) == ( _PDCLIB_FWRITE | _PDCLIB_FRW | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "a+b" ) == ( _PDCLIB_FAPPEND | _PDCLIB_FWRITE | _PDCLIB_FRW | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "rb+" ) == ( _PDCLIB_FREAD | _PDCLIB_FRW | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "wb+" ) == ( _PDCLIB_FWRITE | _PDCLIB_FRW | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "ab+" ) == ( _PDCLIB_FAPPEND | _PDCLIB_FWRITE | _PDCLIB_FRW | _PDCLIB_FBIN ) );
+ TESTCASE( _PDCLIB_filemode( "x" ) == 0 );
+ TESTCASE( _PDCLIB_filemode( "r++" ) == 0 );
+ TESTCASE( _PDCLIB_filemode( "wbb" ) == 0 );
+ TESTCASE( _PDCLIB_filemode( "a+bx" ) == 0 );
+#endif
+ return TEST_RESULTS;
+}
+
+#endif
+