xref: /trunk/main/shell/source/unix/sysshell/recently_used_file.cxx (revision cdf0e10c4e3984b49a9502b011690b615761d4a3)

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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_shell.hxx"

#ifndef INCLUDED_RECENTLY_USED_FILE
#include "recently_used_file.hxx"
#endif
#include <rtl/ustring.hxx>
#include <osl/process.h>
#include <osl/security.hxx>
#include <osl/thread.h>
#include <osl/file.hxx>

#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <unistd.h>

const rtl::OUString RECENTLY_USED_FILE_NAME = rtl::OUString::createFromAscii(".recently-used");
const rtl::OUString SLASH = rtl::OUString::createFromAscii("/");

namespace /* private */ {

inline void ensure_final_slash(/*inout*/ rtl::OUString& path)
{
    if ((path.getLength() > 0) &&
        (SLASH.pData->buffer[0] != path.pData->buffer[path.getLength() - 1]))
        path += SLASH;
}

} // namespace private

//------------------------------------------------
recently_used_file::recently_used_file() :
    file_(NULL)
{
    osl::Security sec;
    rtl::OUString homedir_url;

    if (sec.getHomeDir(homedir_url))
    {
        rtl::OUString homedir;
        osl::FileBase::getSystemPathFromFileURL(homedir_url, homedir);

        rtl::OUString rufn = homedir;
        ensure_final_slash(rufn);
        rufn += RECENTLY_USED_FILE_NAME;

        rtl::OString tmp =
            rtl::OUStringToOString(rufn, osl_getThreadTextEncoding());

        file_ = fopen(tmp.getStr(), "r+");

        /* create if not exist */
        if (NULL == file_) {
            mode_t umask_ = umask(S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
            file_ = fopen(tmp.getStr(), "w+");
            umask(umask_);
        }

        if (NULL == file_)
            throw "I/O error opening ~/.recently-used";

        if (lockf(fileno(file_), F_LOCK, 0) != 0)
        {
            fclose(file_);
            throw "Cannot lock ~/.recently-used";
        }
    }
    else
        throw "Cannot determine user home directory";
}

//------------------------------------------------
recently_used_file::~recently_used_file()
{
    lockf(fileno(file_), F_ULOCK, 0);
    fclose(file_);
}

//------------------------------------------------
void recently_used_file::reset() const
{
    rewind(file_);
}

//------------------------------------------------
void recently_used_file::truncate(off_t length)
{
    if (ftruncate(fileno(file_), length) == -1)
        throw "I/O error: ftruncate failed";
}

//------------------------------------------------
size_t recently_used_file::read(char* buffer, size_t size) const
{
    size_t  r = fread(reinterpret_cast<void*>(buffer), sizeof(char), size, file_);

    if ((r < size) && ferror(file_))
        throw "I/O error: read failed";

    return r;
}

//----------------------------
void recently_used_file::write(const char* buffer, size_t size) const
{
    if (size != fwrite(reinterpret_cast<const void*>(buffer), sizeof(char), size, file_))
        throw "I/O error: write failed";
}

//----------------------------
bool recently_used_file::eof() const
{
    return feof(file_);
}