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annotate toys/touch.c @ 218:bc87305c391f

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Make touch work reliably when file doesn't exist and clean up headers a bit.
author Rob Landley <rob@landley.net>
date Fri, 28 Dec 2007 03:29:33 -0600
parents 3227c5316260
children d4176f3f3835
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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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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 #include "toys.h"
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11
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12 #define OPT_MTIME 0x01
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13 #define OPT_NOCREATE 0x02
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14 #define OPT_ATIME 0x04
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15 #define OPT_REFERENCE 0x08
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16 #define OPT_TIME 0x10
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17 #define OPT_LENGTH 0x20
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18
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19 void touch_main(void)
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20 {
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21 char *arg;
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22 int i, set_a, set_m;
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23 time_t curr_a, curr_m;
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24
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25 set_a = !!(toys.optflags & OPT_ATIME);
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26 set_m = !!(toys.optflags & OPT_MTIME);
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27
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28 // Use timestamp on a file
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29 if (toys.optflags & OPT_REFERENCE) {
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30 struct stat sb;
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31
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32 if (toys.optflags & OPT_TIME)
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33 error_exit("Redundant time source");
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34 xstat(toy.touch.ref_file, &sb);
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35 curr_m = sb.st_mtime;
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36 curr_a = sb.st_atime;
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37
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38 // Use time specified on command line.
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39 } else if (toys.optflags & OPT_TIME) {
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40 struct tm t;
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41 time_t curr;
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42 char *c;
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43
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44 curr = time(NULL);
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45 if (localtime_r(&curr, &t)
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46 || !(c = strptime(toy.touch.time, "%m%d%H%M", &t))
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47 || *c || -1==(curr_a = curr_m = mktime(&t)))
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48 {
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49 error_exit("Unknown time %s", toy.touch.time);
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50 }
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51
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52 // use current time
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53 } else curr_m = curr_a = time(NULL);
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54
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55 for (i = 0; (arg = toys.optargs[i]); i++) {
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56 struct utimbuf buf;
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57 struct stat sb;
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58
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59 buf.modtime = curr_m;
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60 buf.actime = curr_a;
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61
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62 if (stat(arg, &sb)) {
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63 if (!(toys.optflags & OPT_NOCREATE)) {
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64 int temp = umask(0);
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65 xcreate(arg, O_CREAT, 0644);
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66 if (CFG_TOYBOX_FREE) umask(temp);
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67 if (stat(arg, &sb))
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68 goto error;
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69 }
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70 }
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72 if ((set_a+set_m) == 1) {
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73 /* We've been asked to only change one */
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74 if (set_a) buf.modtime = sb.st_mtime;
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75 else if (set_m) buf.actime = sb.st_atime;
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76 }
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78 if (toys.optflags & OPT_LENGTH)
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79 if (truncate(arg, toy.touch.length))
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80 goto error;
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81 if (utime(arg, &buf))
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82 error:
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83 perror_exit(arg);
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84 }
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85 }