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sortix--sortix/libc/stdio/fparsemode.cpp

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2014-02-27 14:57:14 -05:00
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2014.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdio/fparsemode.cpp
Parses the mode argument of functions like fopen().
*******************************************************************************/
#include <errno.h>
#include <stdio.h>
extern "C" int fparsemode(const char* mode)
{
int result;
switch ( *mode++ )
{
case 'r': result = FILE_MODE_READ; break;
case 'w': result = FILE_MODE_WRITE | FILE_MODE_CREATE | FILE_MODE_TRUNCATE; break;
case 'a': result = FILE_MODE_WRITE | FILE_MODE_CREATE | FILE_MODE_APPEND; break;
default: return errno = EINVAL, -1;
};
while ( *mode )
{
switch ( *mode++ )
{
case 'b': result |= FILE_MODE_BINARY; break;
case 'e': result |= FILE_MODE_CLOEXEC; break;
case 't': result &= ~FILE_MODE_BINARY; break;
case 'x': result |= FILE_MODE_EXCL; break;
case '+': result |= FILE_MODE_READ | FILE_MODE_WRITE; break;
default: return errno = EINVAL, -1;
};
}
return result;
}