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55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <error.h>
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#include <limits.h>
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void my_splice(int in, int out) {
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int pipefd[2], nr, ret;
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if (pipe(pipefd) < 0)
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error(1, errno, "cannot create pipe");
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for (;;) {
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nr = splice(in, 0, pipefd[1], 0, INT_MAX, 0);
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if (nr == -1)
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error(1, errno, "cannot read input");
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if (nr == 0)
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break;
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do {
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ret = splice(pipefd[0], 0, out, 0, nr, 0);
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if (ret == -1)
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error(1, errno, "cannot write");
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nr -= ret;
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} while (nr);
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}
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close(pipefd[0]);
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close(pipefd[1]);
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}
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int main(int argc, char **argv) {
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int i;
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char **argvp = argv+1;
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int fd, ret;
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ssize_t ret2;
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for (i = 1; i < argc; i++, argvp++) {
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fd = open(*argvp, O_RDONLY);
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if (fd == -1)
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error(1, errno, "cannot open file %s", *argvp);
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ret = lseek(fd, 46, SEEK_SET);
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if (ret == -1)
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error(1, errno, "cannot seek in file %s", *argvp);
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for (;;) {
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ret2 = sendfile(STDOUT_FILENO, fd, 0, INT_MAX);
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if (ret2 == -1)
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error(1, errno, "cannot copy", *argvp);
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if (ret2 < 4096)
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break;
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}
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/* my_splice(fd, STDOUT_FILENO);*/
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ret = close(fd);
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if (ret == -1)
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error(1, errno, "cannot close file %s", *argvp);
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}
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return 0;
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}
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