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annotate toys/posix/head.c @ 700:ad6bff0c9169

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Refactor touch (cleanup whitespace, brackets, function order), code otherwise same.
author Rob Landley <rob@landley.net>
date Fri, 16 Nov 2012 15:36:01 -0600
parents 786841fdb1e0
children 6cc69be43c42
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 674
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1 /* head.c - copy first lines from input to stdout.
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2 *
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3 * Copyright 2006 Timothy Elliott <tle@holymonkey.com>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/head.html
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6
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7 USE_HEAD(NEWTOY(head, "n#<0=10", TOYFLAG_BIN))
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8
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9 config HEAD
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10 bool "head"
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11 default y
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12 help
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13 usage: head [-n number] [file...]
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15 Copy first lines from files to stdout. If no files listed, copy from
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16 stdin. Filename "-" is a synonym for stdin.
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18 -n Number of lines to copy.
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19 */
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20
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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21 #define FOR_head
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22 #include "toys.h"
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23
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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24 GLOBALS(
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25 long lines;
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26 int file_no;
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27 )
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28
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29 static void do_head(int fd, char *name)
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30 {
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31 int i, len, lines=TT.lines, size=sizeof(toybuf);
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32
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33 if (toys.optc > 1) {
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34 // Print an extra newline for all but the first file
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35 if (TT.file_no++) xprintf("\n");
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36 xprintf("==> %s <==\n", name);
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37 xflush();
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parents: 674
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38 }
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39
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40 while (lines) {
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parents: 674
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41 len = read(fd, toybuf, size);
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parents: 674
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42 if (len<0) {
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43 perror_msg("%s",name);
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44 toys.exitval = EXIT_FAILURE;
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45 }
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46 if (len<1) break;
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47
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48 for(i=0; i<len;) if (toybuf[i++] == '\n' && !--lines) break;
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50 xwrite(1, toybuf, i);
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51 }
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52 }
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54 void head_main(void)
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55 {
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56 loopfiles(toys.optargs, do_head);
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57 }