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annotate toys/touch.c @ 198:3227c5316260

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Update links and add some more spec comments.
author Rob Landley <rob@landley.net>
date Tue, 11 Dec 2007 15:41:31 -0600
parents 30a6db5a95c2
children bc87305c391f
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1 /* vi: set sw=4 ts=4: */
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2 /*
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3 * touch.c - Modify a file's timestamps.
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4 *
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5 * Copyright (C) 2007 Charlie Shepherd <masterdriverz@gentoo.org>
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6 *
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3227c5316260 Update links and add some more spec comments.
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7 * See http://www.opengroup.org/onlinepubs/009695399/utilities/touch.html
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8 */
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9
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10 #define _XOPEN_SOURCE 600
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11 #include <unistd.h>
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12 #include <sys/types.h>
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13 #include <sys/stat.h>
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14 #include <utime.h>
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15 #include <time.h>
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16 #include "toys.h"
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17
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18 #define OPT_MTIME 0x01
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19 #define OPT_NOCREATE 0x02
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20 #define OPT_ATIME 0x04
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21 #define OPT_REFERENCE 0x08
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22 #define OPT_TIME 0x10
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23 #define OPT_LENGTH 0x20
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24
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25 void touch_main(void)
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26 {
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27 char *arg;
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28 int i, set_a, set_m;
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29 time_t curr_a, curr_m;
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30
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31 set_a = !!(toys.optflags & OPT_ATIME);
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32 set_m = !!(toys.optflags & OPT_MTIME);
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33
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34 // Use timestamp on a file
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35 if (toys.optflags & OPT_REFERENCE) {
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36 struct stat sb;
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37
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38 if (toys.optflags & OPT_TIME)
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39 error_exit("Redundant time source");
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40 xstat(toy.touch.ref_file, &sb);
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41 curr_m = sb.st_mtime;
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42 curr_a = sb.st_atime;
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43
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44 // Use time specified on command line.
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45 } else if (toys.optflags & OPT_TIME) {
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46 struct tm t;
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47 time_t curr;
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48 char *c;
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49
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50 curr = time(NULL);
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51 if (localtime_r(&curr, &t)
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52 || !(c = strptime(toy.touch.time, "%m%d%H%M", &t))
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53 || *c || -1==(curr_a = curr_m = mktime(&t)))
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54 {
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55 error_exit("Unknown time %s", toy.touch.time);
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56 }
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57
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58 // use current time
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59 } else curr_m = curr_a = time(NULL);
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61 for (i = 0; (arg = toys.optargs[i]); i++) {
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62 struct utimbuf buf;
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63 struct stat sb;
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65 buf.modtime = curr_m;
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66 buf.actime = curr_a;
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67
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68 if (stat(arg, &sb) == -1) {
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69 if (!(toys.optflags & OPT_NOCREATE) && errno == ENOENT) {
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70 if (creat(arg, 0644))
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71 goto error;
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72 if (stat(arg, &sb))
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73 goto error;
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74 }
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75 }
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77 if ((set_a+set_m) == 1) {
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78 /* We've been asked to only change one */
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79 if (set_a) buf.modtime = sb.st_mtime;
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80 else if (set_m) buf.actime = sb.st_atime;
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81 }
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82
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83 if (toys.optflags & OPT_LENGTH)
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84 if (truncate(arg, toy.touch.length))
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85 goto error;
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86 if (utime(arg, &buf))
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87 error:
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88 perror_exit(arg);
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89 }
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90 }