libmocha/source/devoptab/devoptab_fsa_truncate.cpp

#include "../logger.h"
#include "devoptab_fsa.h"
#include <mutex>

int __fsa_ftruncate(struct _reent *r,
                    void *fd,
                    off_t len) {

    // Make sure length is non-negative
    if (!fd || len < 0) {
        r->_errno = EINVAL;
        return -1;
    }

    auto *file             = static_cast<__fsa_file_t *>(fd);
    const auto *deviceData = static_cast<__fsa_device_t *>(r->deviceData);

    std::scoped_lock lock(file->mutex);

    // Set the new file size
    FSError status = FSASetPosFile(deviceData->clientHandle, file->fd, len);
    if (status < 0) {
        DEBUG_FUNCTION_LINE_ERR("FSASetPosFile(0x%08X, 0x%08X, 0x%08llX) failed: %s",
                                deviceData->clientHandle, file->fd, len, FSAGetStatusStr(status));
        r->_errno = __fsa_translate_error(status);
        return -1;
    }

    status = FSATruncateFile(deviceData->clientHandle, file->fd);
    if (status < 0) {
        DEBUG_FUNCTION_LINE_ERR("FSATruncateFile(0x%08X, 0x%08X) failed: %s",
                                deviceData->clientHandle, file->fd, FSAGetStatusStr(status));
        r->_errno = __fsa_translate_error(status);
        return -1;
    }

    return 0;
}