Function FIO_determineCompressedName

freebsd/contrib/zstd/programs/fileio.c:1734–1767

FIO_determineCompressedName() : * create a destination filename for compressed srcFileName. * @return a pointer to it. * This function never returns an error (it may abort() in case of pb) */

 * This function never returns an error (it may abort() in case of pb)
 */
static const char*
FIO_determineCompressedName(const char* srcFileName, const char* outDirName, const char* suffix)
{
    static size_t dfnbCapacity = 0;
    static char* dstFileNameBuffer = NULL;   /* using static allocation : this function cannot be multi-threaded */
    char* outDirFilename = NULL;
    size_t sfnSize = strlen(srcFileName);
    size_t const srcSuffixLen = strlen(suffix);
    if (outDirName) {
        outDirFilename = FIO_createFilename_fromOutDir(srcFileName, outDirName, srcSuffixLen);
        sfnSize = strlen(outDirFilename);
        assert(outDirFilename != NULL);
    }

    if (dfnbCapacity <= sfnSize+srcSuffixLen+1) {
        /* resize buffer for dstName */
        free(dstFileNameBuffer);
        dfnbCapacity = sfnSize + srcSuffixLen + 30;
        dstFileNameBuffer = (char*)malloc(dfnbCapacity);
        if (!dstFileNameBuffer) {
            EXM_THROW(30, "zstd: %s", strerror(errno));
        }
    }
    assert(dstFileNameBuffer != NULL);

    if (outDirFilename) {
        memcpy(dstFileNameBuffer, outDirFilename, sfnSize);
        free(outDirFilename);
    } else {
        memcpy(dstFileNameBuffer, srcFileName, sfnSize);
    }
    memcpy(dstFileNameBuffer+sfnSize, suffix, srcSuffixLen+1 /* Include terminating null */);
    return dstFileNameBuffer;
}

static unsigned long long FIO_getLargestFileSize(const char** inFileNames, unsigned nbFiles)
{