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#include "tempfile.h" 

#include <util/folder/dirut.h>
#include <util/generic/yexception.h>
#include <util/stream/file.h>

#include <cerrno>
#include <cstring>

#ifdef _win32_
    #include "winint.h"
    #include <io.h>
#else
    #include <unistd.h>
    #include <stdlib.h>
#endif

extern "C" int mkstemps(char* path, int slen);

TString MakeTempName(const char* wrkDir, const char* prefix, const char* extension) { 
#ifndef _win32_
    TString filePath; 

    if (wrkDir && *wrkDir) {
        filePath += wrkDir; 
    } else {
        filePath += GetSystemTempDir(); 
    }

    if (filePath.back() != '/') { 
        filePath += '/'; 
    }

    if (prefix) { 
        filePath += prefix; 
    }

    filePath += "XXXXXX"; // mkstemps requirement 

    size_t extensionPartLength = 0; 
    if (extension && *extension) { 
        if (extension[0] != '.') { 
            filePath += '.'; 
            extensionPartLength += 1; 
        } 
        filePath += extension; 
        extensionPartLength += strlen(extension); 
    }

    int fd = mkstemps(const_cast<char*>(filePath.data()), extensionPartLength); 
    if (fd >= 0) { 
        close(fd);
        return filePath; 
    }
#else
    char tmpDir[MAX_PATH + 1]; // +1 -- for terminating null character 
    char filePath[MAX_PATH]; 
    const char* pDir = 0;

    if (wrkDir && *wrkDir) { 
        pDir = wrkDir;
    } else if (GetTempPath(MAX_PATH + 1, tmpDir)) { 
        pDir = tmpDir; 
    } 

    // it always takes up to 3 characters, no more 
    if (GetTempFileName(pDir, (prefix) ? (prefix) : "yan", 0, filePath)) { 
        return filePath; 
    } 
#endif

    ythrow TSystemError() << "can not create temp name(" << wrkDir << ", " << prefix << ", " << extension << ")"; 
}