small fixes:
fix xstrdup to not grossly overallocate memory use xopen instean of xopen3 in several places etc.
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@ -138,7 +138,7 @@ int dd_main(int argc, char **argv)
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if (!seek && (flags & trunc_flag))
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oflag |= O_TRUNC;
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ofd = xopen3(outfile, oflag, 0666);
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ofd = xopen(outfile, oflag);
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if (seek && (flags & trunc_flag)) {
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if (ftruncate(ofd, seek * obs) < 0) {
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