busybox/archival/libunarchive/copy_file_chunk_fd.c

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2002-09-25 08:17:48 +05:30
#include <unistd.h>
#include <sys/types.h>
#include "libbb.h"
/* Copy CHUNKSIZE bytes (or untill EOF if chunksize == -1)
* from SRC_FILE to DST_FILE. */
extern int copy_file_chunk_fd(int src_fd, int dst_fd, off_t chunksize)
{
size_t nread, size;
char buffer[BUFSIZ];
while (chunksize != 0) {
if (chunksize > BUFSIZ) {
size = BUFSIZ;
} else {
size = chunksize;
}
nread = xread(src_fd, buffer, size);
if (nread == 0) {
return 1;
}
if (write (dst_fd, buffer, nread) != nread) {
error_msg_and_die ("Short write");
}
if (chunksize != -1) {
chunksize -= nread;
}
}
return 0;
}