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sortix--sortix/libc/stdio/fparsemode.c

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/*
* Copyright (c) 2014 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* stdio/fparsemode.c
* Parses the mode argument of functions like fopen().
*/
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#include <errno.h>
#include <stdio.h>
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int fparsemode(const char* mode)
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{
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;
}