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/*
Copyright (C) 2025 Mikael Hildenborg
SPDX-License-Identifier: BSD-2-Clause
*/
#include <unistd.h>
#include <_ansi.h>
#include "atari-gem_errno.h"
#include "atari-traps.h"
// I really don't like having these defines here,
// fcntl.h where they are, also defines a function for "open",
// that is different from the one libgloss is supposed to provide...
#ifndef O_CREAT
#define O_CREAT 0x0200
#endif // O_CREAT
#ifndef O_APPEND
#define O_APPEND 0x0008
#endif // O_APPEND
#ifndef O_EXCL
#define O_EXCL 0x0800
#endif // O_EXCL
#ifndef O_TRUNC
#define O_TRUNC 0x0400
#endif // O_TRUNC
// mode is ignored. Those kind of settings is not supported by the st.
int open(const char *buf, int flags, int mode)
{
int bios_handle = -1;
unsigned short bios_mode = (unsigned short)(flags & 0x3); // bits 0-1 the same for st and linux.
int create = flags & O_CREAT;
int append = flags & O_APPEND; // open doc says that seek end should be done before each write call. We assume that newlib handles that.
int excl = flags & O_EXCL; // File must be created by this call.
int trunc = flags & O_TRUNC; // File is forced to be created and thus truncated.
const char *bios_path = buf;
if (!trunc)
{
bios_handle = trap1_3d(bios_path, bios_mode);
}
if (bios_handle < 0 && (create || trunc))
{
unsigned short bios_attrib = 0;
bios_handle = trap1_3c(bios_path, bios_attrib);
}
else if (create && excl)
{
// We explicitly specified that file must be created, and it already existed, so error!
gem_error_to_errno(GEM_EACCDN);
// Close file.
trap1_3e((unsigned short)bios_handle);
return -1;
}
if (bios_handle >= 0 && append)
{
// Seek to end.
int new_file_pos = trap1_42(0, (unsigned short)bios_handle, 2);
if (new_file_pos < 0)
{
gem_error_to_errno(new_file_pos);
// Close file.
trap1_3e((unsigned short)bios_handle);
return -1;
}
}
if (bios_handle < 0)
{
gem_error_to_errno(bios_handle);
bios_handle = -1;
}
/*
If bios_handle is positive, then the low word is the gemdos handle, and the high word is zero.
*/
return bios_handle;
}
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