3276fbea1c
If we are just copying data from one file to another, we don't need to fill a complete buffer, just read a chunk at a time, and write it to the output.
53 lines
824 B
C
53 lines
824 B
C
/* See LICENSE file for copyright and license details. */
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s [-u] [file ...]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int fd, ret = 0;
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ARGBEGIN {
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case 'u':
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break;
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default:
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usage();
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} ARGEND
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if (!argc) {
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if (concat(0, "<stdin>", 1, "<stdout>") < 0)
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ret = 1;
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} else {
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for (; *argv; argc--, argv++) {
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if (!strcmp(*argv, "-")) {
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*argv = "<stdin>";
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fd = 0;
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} else if ((fd = open(*argv, O_RDONLY)) < 0) {
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weprintf("open %s:", *argv);
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ret = 1;
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continue;
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}
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switch (concat(fd, *argv, 1, "<stdout>")) {
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case -1:
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ret = 1;
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break;
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case -2:
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return 1; /* exit on write error */
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}
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if (fd != 0)
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close(fd);
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}
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}
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return ret;
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}
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