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annotate uprogs/cat.c @ 0:c450faca55f4

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author Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
date Sun, 22 Oct 2017 18:25:39 +0900
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Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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1 #include "types.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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2 #include "stat.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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3 #include "user.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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4
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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5 char buf[512];
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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6
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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7 void
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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8 cat(int fd)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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9 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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10 int n;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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11 while((n = read(fd, buf, sizeof(buf))) > 0)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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12 write(1, buf, n);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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13 if(n < 0){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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14 printf(1, "cat: read error\n");
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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15 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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16 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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17 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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18
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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19 int
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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20 main(int argc, char *argv[])
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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21 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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22 int fd, i;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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23
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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24 if(argc <= 1){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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25 cat(0);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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26 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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27 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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28
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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29 for(i = 1; i < argc; i++){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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30 if((fd = open(argv[i], 0)) < 0){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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31 printf(1, "cat: cannot open %s\n", argv[i]);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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32 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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33 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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34 cat(fd);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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35 close(fd);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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36 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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37 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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38 }