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annotate toys/posix/touch.c @ 702:9fb5fe6eb13f

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More touch cleanup to use generic infrastructure: use getdate() from libc, use flag macros, option parsing can collect argument strings in global block, use existing perror_* macros.
author Rob Landley <rob@landley.net>
date Fri, 16 Nov 2012 18:01:35 -0600
parents 7b316e3c0e11
children dcc6136e6659
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * touch.c : change timestamp of a file
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4 * Copyright 2012 Choubey Ji <warior.linux@gmail.com>
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5 *
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6 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html
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7
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8 USE_TOUCH(NEWTOY(touch, "mr:t:", TOYFLAG_BIN))
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9
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10 config TOUCH
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11 bool "th"
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12 default y
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13 help
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14 Usage: Usage: touch [OPTION]... FILE...
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15 Update the access and modification times of each FILE to the current time.
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16 -m change only the modification time
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17 -r, --reference=FILE use this file's times instead of current time
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18 -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time
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19 */
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20
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21 #define FOR_touch
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22 #include "toys.h"
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23
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24 GLOBALS(
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25 char *date;
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26 char *file;
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27 )
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28
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29 void touch_main(void)
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30 {
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31 int fd;
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32 time_t now;
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33 struct utimbuf modinfo;
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34 struct stat st;
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36 if (TT.date) {
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37 struct tm *tm = getdate(TT.date);
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39 if (!tm) perror_exit("bad date '%s'", TT.date);
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40 now = mktime(tm);
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41 } else time(&now);
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42 modinfo.modtime = now;
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43 modinfo.actime = now;
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45 if (TT.file) {
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46 xstat(TT.file, &st);
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47 modinfo.modtime = st.st_mtime;
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48 modinfo.actime = st.st_atime;
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49 }
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51 if (toys.optflags & FLAG_m) {
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52 if(stat(toys.optargs[toys.optc - 1], &st) < 0) {
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53 toys.exitval = EXIT_FAILURE;
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54 return;
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55 }
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56 modinfo.actime = st.st_atime;
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57 if(!(toys.optflags & (FLAG_r|FLAG_t))) {
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58 time(&now);
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59 modinfo.modtime = now;
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60 }
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61 }
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62 if (utime(toys.optargs[toys.optc - 1], &modinfo) == -1) {
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63 if ((fd = open(toys.optargs[toys.optc - 1],O_CREAT |O_RDWR, 0644)) != -1) {
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64 close(fd);
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65 utime(toys.optargs[toys.optc - 1], &modinfo);
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66 } else {
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67 perror_msg("can't create '%s'", toys.optargs[toys.optc-1]);
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68 toys.exitval = EXIT_FAILURE;
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69 }
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70 }
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71 }