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36 lines
748 B
C++
36 lines
748 B
C++
#include "crucible/error.h"
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#include "crucible/fd.h"
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#include "crucible/fs.h"
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using namespace crucible;
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using namespace std;
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int
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main(int argc, char **argv)
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{
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if (argc <= 2) {
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cerr << "Usage: " << argv[0] << " FILE1 FILE2 [...FILEn] > OUTFILE" << endl;
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cerr << "Catenates FILE1..FILEN using copy_file_range" << endl;
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return EXIT_FAILURE;
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}
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off_t out_pos = 0;
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while (*++argv) {
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string filename(*argv);
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Fd input_fd = open_or_die(filename, O_RDONLY);
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Stat st(input_fd);
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off_t len = st.st_size;
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cerr << "clone_range(" << filename << ", 0, " << len << ", STDOUT_FILENO, " << out_pos << ")" << flush;
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btrfs_clone_range(input_fd, 0, len, STDOUT_FILENO, out_pos);
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out_pos += len;
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cerr << endl;
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}
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return EXIT_SUCCESS;
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}
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