xv6-65oo2/cat.c

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