40 lines
582 B
C
40 lines
582 B
C
#include "kernel/types.h"
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#include "kernel/stat.h"
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#include "user/user.h"
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char buf[512];
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void cat(int fd) {
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int n;
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while ((n = read(fd, buf, sizeof(buf))) > 0) {
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if (write(1, buf, n) != n) {
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fprintf(2, "cat: write error\n");
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exit(1);
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}
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}
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if (n < 0) {
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fprintf(2, "cat: read error\n");
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exit(1);
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}
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}
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int main(int argc, char *argv[]) {
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int fd, i;
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if (argc <= 1) {
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cat(0);
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exit(0);
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}
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for (i = 1; i < argc; i++) {
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if ((fd = open(argv[i], 0)) < 0) {
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fprintf(2, "cat: cannot open %s\n", argv[i]);
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exit(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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exit(0);
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}
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