Function ftruncate

util/system/compat.cpp:28–30

    #include <fcntl.h>
int ftruncate(int fd, i64 length) {
    return _chsize_s(fd, length);
}
int truncate(const char* name, i64 length) {
    int fd = ::_open(name, _O_WRONLY);
    int ret = ftruncate(fd, length);