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1 /* vi: set sw=4 ts=4:
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2 *
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3 * truncate.c - set file length, extending sparsely if necessary
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4 *
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5 * Copyright 2011 Rob Landley <rob@landley.net>
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6
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7 USE_TRUNCATE(NEWTOY(truncate, "<1s#|c", TOYFLAG_BIN))
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8
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9 config TRUNCATE
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10 bool "truncate"
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11 default y
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12 help
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13 usage: truncate [-c] -s file...
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14 Set length of file(s), extending sparsely if necessary.
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15
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16 -c Don't create file if it doesn't exist.
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17 -s New size
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18 */
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19
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20 #include "toys.h"
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21
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22 DEFINE_GLOBALS(
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23 long size;
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24 )
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25
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26 #define TT this.truncate
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27
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28 static void do_truncate(int fd, char *name)
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29 {
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30 if (fd<0) return;
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31 if (ftruncate(fd, TT.size)) {
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32 perror_msg("failed to set '%s' to '%ld'", name, TT.size);
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33 toys.exitval = EXIT_FAILURE;
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34 }
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35 }
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36
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37 void truncate_main(void)
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38 {
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39 int cr = !(toys.optflags&1);
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40
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41 // Create files with mask rwrwrw.
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42 // Nonexistent files are only an error if we're supposed to create them.
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43 loopfiles_rw(toys.optargs, O_WRONLY|(cr ? O_CREAT : 0), 0666, cr,
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44 do_truncate);
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45 }
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