Mercurial > hg > toybox
annotate toys/cat.c @ 587:82ffae226c40
Convert another realpath use to xrealpath().
author  Rob Landley <rob@landley.net> 

date  Fri, 01 Jun 2012 17:59:11 0500 
parents  d1ae502ee190 
children 
rev  line source 

279
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Spent the five minutes to implement "cat".
Rob Landley <rob@landley.net>
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1 /* vi: set sw=4 ts=4: 
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2 * 
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An error from an input file isn't fatal, keep reading remaining input files.
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3 * cat.c  copy inputs to stdout. 
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Rob Landley <rob@landley.net>
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4 * 
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5 * Copyright 2006 Rob Landley <rob@landley.net> 
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6 * 
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7 * See http://www.opengroup.org/onlinepubs/009695399/utilities/cat.html 
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8 
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9 USE_CAT(NEWTOY(cat, "u", TOYFLAG_BIN)) 
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10 
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11 config CAT 
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12 bool "cat" 
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13 default y 
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14 help 
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15 usage: cat [u] [file...] 
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16 Copy (concatenate) files to stdout. If no files listed, copy from stdin. 
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17 Filename "" is a synonym for stdin. 
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18 
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19 u Copy one byte at a time (slow). 
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20 */ 
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21 
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22 #include "toys.h" 
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23 
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24 static void do_cat(int fd, char *name) 
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25 { 
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26 int len, size=toys.optflags ? 1 : sizeof(toybuf); 
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27 
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28 for (;;) { 
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29 len = read(fd, toybuf, size); 
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30 if (len<0) { 
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31 perror_msg("%s",name); 
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32 toys.exitval = EXIT_FAILURE; 
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33 } 
279
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34 if (len<1) break; 
281  35 xwrite(1, toybuf, len); 
279
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Rob Landley <rob@landley.net>
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36 } 
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37 } 
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38 
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39 void cat_main(void) 
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40 { 
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41 loopfiles(toys.optargs, do_cat); 
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42 } 