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/* _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
/* 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( const char * const mode )
{
unsigned rc = 0;
size_t i;
if ( mode == NULL )
{
return 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 ( i = 1; i < 4; ++i )
{
switch ( mode[i] )
{
case '+':
if ( rc & _PDCLIB_FRW )
{
/* Duplicates are invalid */
return 0;
}
rc |= _PDCLIB_FRW;
break;
case 'b':
if ( rc & _PDCLIB_FBIN )
{
/* Duplicates are invalid */
return 0;
}
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
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