annotate toys/touch.c @ 233:d4176f3f3835

Zap toys/Config.in and instead create generated/Config.in from contents of toys/*.c. Move relevant info into comment at the top of each toys/*.c. Also convert more of Makefile into a thin wrapper around shell scripts that actually do the work. (Makefile is only still there for the user interface.)
author Rob Landley <rob@landley.net>
date Sat, 19 Jan 2008 17:08:39 -0600
parents bc87305c391f
children 163498bf547b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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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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30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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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 config TOUCH
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10 bool "touch"
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11 default y
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12 help
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13 usage: touch [-acm] [-r FILE] [-t MMDDhhmm] [-l bytes] FILE...
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14
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15 Change file timestamps, ensure file existance and change file length.
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16
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17 -a Only change the access time.
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18 -c Do not create the file if it doesn't exist.
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19 -l Length to truncate (or sparsely extend) file to.
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20 -m Only change the modification time.
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21 -r Reference file to take timestamps from.
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22 -t Time to change {a,m}time to.
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23 */
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24
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25 #include "toys.h"
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26
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27 #define OPT_MTIME 0x01
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28 #define OPT_NOCREATE 0x02
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29 #define OPT_ATIME 0x04
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30 #define OPT_REFERENCE 0x08
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31 #define OPT_TIME 0x10
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32 #define OPT_LENGTH 0x20
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33
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34 void touch_main(void)
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35 {
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36 char *arg;
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37 int i, set_a, set_m;
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38 time_t curr_a, curr_m;
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39
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40 set_a = !!(toys.optflags & OPT_ATIME);
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41 set_m = !!(toys.optflags & OPT_MTIME);
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42
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43 // Use timestamp on a file
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44 if (toys.optflags & OPT_REFERENCE) {
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45 struct stat sb;
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46
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47 if (toys.optflags & OPT_TIME)
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48 error_exit("Redundant time source");
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49 xstat(toy.touch.ref_file, &sb);
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50 curr_m = sb.st_mtime;
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51 curr_a = sb.st_atime;
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52
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53 // Use time specified on command line.
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54 } else if (toys.optflags & OPT_TIME) {
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55 struct tm t;
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56 time_t curr;
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57 char *c;
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58
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59 curr = time(NULL);
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60 if (localtime_r(&curr, &t)
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61 || !(c = strptime(toy.touch.time, "%m%d%H%M", &t))
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62 || *c || -1==(curr_a = curr_m = mktime(&t)))
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63 {
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64 error_exit("Unknown time %s", toy.touch.time);
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65 }
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66
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67 // use current time
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68 } else curr_m = curr_a = time(NULL);
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69
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70 for (i = 0; (arg = toys.optargs[i]); i++) {
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71 struct utimbuf buf;
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72 struct stat sb;
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73
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74 buf.modtime = curr_m;
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75 buf.actime = curr_a;
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76
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77 if (stat(arg, &sb)) {
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78 if (!(toys.optflags & OPT_NOCREATE)) {
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79 int temp = umask(0);
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80 xcreate(arg, O_CREAT, 0644);
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81 if (CFG_TOYBOX_FREE) umask(temp);
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82 if (stat(arg, &sb))
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83 goto error;
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84 }
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85 }
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86
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87 if ((set_a+set_m) == 1) {
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88 /* We've been asked to only change one */
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89 if (set_a) buf.modtime = sb.st_mtime;
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90 else if (set_m) buf.actime = sb.st_atime;
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91 }
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92
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93 if (toys.optflags & OPT_LENGTH)
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94 if (truncate(arg, toy.touch.length))
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95 goto error;
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96 if (utime(arg, &buf))
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97 error:
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98 perror_exit(arg);
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99 }
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100 }