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1 #include "types.h"
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2 #include "stat.h"
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3 #include "user.h"
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4
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5 char buf[512];
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6
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7 void
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8 cat(int fd)
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9 {
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10 int n;
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11
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12 while((n = read(fd, buf, sizeof(buf))) > 0)
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13 write(1, buf, n);
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14 if(n < 0){
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15 printf(1, "cat: read error\n");
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16 exit();
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17 }
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18 }
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19
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20 int
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21 main(int argc, char *argv[])
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22 {
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23 int fd, i;
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24
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25 if(argc <= 1){
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26 cat(0);
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27 exit();
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28 }
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29
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30 for(i = 1; i < argc; i++){
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31 if((fd = open(argv[i], 0)) < 0){
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32 printf(1, "cat: cannot open %s\n", argv[i]);
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33 exit();
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34 }
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35 cat(fd);
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36 close(fd);
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37 }
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38 exit();
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39 }
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