37 lines
630 B
C
37 lines
630 B
C
#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define BUF_SIZE 512
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char buf[BUF_SIZE];
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void cat(int fd)
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{
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int n = 0;
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while ((n = read(fd, buf, sizeof(buf))) > 0) {
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if (fwrite(buf, n, 1, stdout) != n) {
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exit(1);
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}
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}
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}
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int main(int argc, char** argv)
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{
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int fd, i;
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if (argc <= 1) {
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cat(0);
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return 0;
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}
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for (i = 1; i < argc; i++) {
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if ((fd = open(argv[i], O_RDONLY)) < 0) {
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printf("cat: cannot open %s\n", argv[i]);
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return 1;
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}
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cat(fd);
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close(fd);
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}
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return 0;
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} |