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