34 lines
617 B
C
34 lines
617 B
C
#include <unistd.h>
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#include <sys/types.h>
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#include "libbb.h"
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/* Copy CHUNKSIZE bytes (or untill EOF if chunksize == -1)
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* from SRC_FILE to DST_FILE. */
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extern int copy_file_chunk_fd(int src_fd, int dst_fd, off_t chunksize)
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{
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size_t nread, size;
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char buffer[BUFSIZ];
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while (chunksize != 0) {
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if (chunksize > BUFSIZ) {
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size = BUFSIZ;
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} else {
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size = chunksize;
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}
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nread = xread(src_fd, buffer, size);
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if (nread == 0) {
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return 1;
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}
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if (write (dst_fd, buffer, nread) != nread) {
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error_msg_and_die ("Short write");
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}
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if (chunksize != -1) {
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chunksize -= nread;
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}
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}
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return 0;
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}
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