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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"
const char* lineEnding = "\r\n";
int writeUntilDoneOrError(int fd, size_t len, const char* buf)
{
size_t written = 0;
if (len == 0)
{
return 0;
}
do
{
int n = trap1_40((unsigned short)fd, len, buf);
if (n < 0)
{
gem_error_to_errno(n);
return -1;
}
written += n;
buf += n;
} while (written < len);
return 0;
}
_READ_WRITE_RETURN_TYPE write(int fd, const void *buf, size_t nbytes)
{
int numWritten = GEM_EIHNDL;
if (fd >= 0)
{
if (fd == 2)
{
fd = GSH_CONOUT; // Use console out for stderr.
}
if (fd == GSH_CONOUT)
{
// When we write to stdout on Atari, we must add a \r after \n to
// get the correct C output behaviour.
const char* stream = (const char*)buf;
size_t lastWrite = 0;
for (size_t i = 0; i < nbytes; ++i)
{
if (stream[i] == '\n')
{
int len = i - lastWrite; // length up to but not including \n
if (writeUntilDoneOrError(fd, len, stream + lastWrite) < 0)
{
return -1;
}
if (writeUntilDoneOrError(fd, 2, lineEnding) < 0)
{
return -1;
}
lastWrite = i + 1; // Include the \n
}
}
if (lastWrite < nbytes)
{
int len = nbytes - lastWrite;
if (writeUntilDoneOrError(fd, len, stream + lastWrite) < 0)
{
return -1;
}
}
numWritten = nbytes;
}
else
{
numWritten = trap1_40((unsigned short)fd, nbytes, buf);
}
}
if (numWritten < 0)
{
gem_error_to_errno(numWritten);
return -1;
}
return numWritten;
}
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