annotate toys/touch.c @ 163:a913f894b7d8

Simplify touch -l slightly.
author Rob Landley <rob@landley.net>
date Thu, 15 Nov 2007 20:43:35 -0600
parents 0864aec90026
children 25447caf1b4b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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8 #define _XOPEN_SOURCE 600
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9 #include <unistd.h>
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10 #include <sys/types.h>
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11 #include <sys/stat.h>
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12 #include <utime.h>
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13 #include <time.h>
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14 #include "toys.h"
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15
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16 #define MTIME 0x01
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17 #define NO_CREATE 0x02
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18 #define ATIME 0x04
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19 #define REFERENCE 0x08
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20 #define TIME 0x10
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21 #define LENGTH 0x20
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22
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23 int touch_main(void)
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24 {
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25 char *arg;
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26 int i, set_a, set_m, create;
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27 time_t curr_a, curr_m;
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28
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29 set_a = !!(toys.optflags & ATIME);
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30 set_m = !!(toys.optflags & MTIME);
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31 create = !(toys.optflags & NO_CREATE);
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32
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33 if (toys.optflags & REFERENCE) {
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34 struct stat sb;
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35 if (toys.optflags & TIME)
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36 error_exit("Cannot specify times from more than one source");
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37 xstat(toy.touch.ref_file, &sb);
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38 curr_m = sb.st_mtime;
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39 curr_a = sb.st_atime;
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40 } else if (toys.optflags & TIME) {
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41 struct tm t;
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42 time_t curr;
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43 char *c;
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44 curr = time(NULL);
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45 if (!localtime_r(&curr, &t))
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46 goto time_error;
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47 c = strptime(toy.touch.time, "%m%d%H%M", &t);
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48 if (!c || *c)
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49 goto time_error;
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50 curr_a = curr_m = mktime(&t);
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51 if (curr_a == -1)
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52 time_error:
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53 error_exit("Error converting time %s to internal format",
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54 toy.touch.time);
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55 } else {
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56 curr_m = curr_a = time(NULL);
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57 }
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58
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59 for (i = 0; (arg = toys.optargs[i]); i++) {
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60 struct utimbuf buf;
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61 struct stat sb;
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62
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63 buf.modtime = curr_m;
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64 buf.actime = curr_a;
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65
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66 if (stat(arg, &sb) == -1) {
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67 if (create && errno == ENOENT) {
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68 if (creat(arg, 0644))
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69 goto error;
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70 if (stat(arg, &sb))
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71 goto error;
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72 }
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73 }
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74
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75 if ((set_a+set_m) == 1) {
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76 /* We've been asked to only change one */
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77 if (set_a)
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78 buf.modtime = sb.st_mtime;
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79 else if (set_m)
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80 buf.actime = sb.st_atime;
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81 }
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82
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83 if (toys.optflags & 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
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91 return 0;
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92 }