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      1 #include <stdio.h>
      2 #include <string.h>
      3 #include <sys/types.h>
      4 #include <fcntl.h>
      5 #include <sys/stat.h>
      6 #include <stdlib.h>
      7 #include <fcntl.h>
      8 #include <time.h>
      9 
     10 static void usage(void)
     11 {
     12         fprintf(stderr, "touch: usage: touch [-alm] [-t YYYYMMDD[.hhmmss]] <file>\n");
     13         exit(1);
     14 }
     15 
     16 static time_t parse_time(char *s)
     17 {
     18     struct tm tm;
     19     int day = atoi(s);
     20     int hour = 0;
     21 
     22     while (*s && *s != '.') {
     23         s++;
     24     }
     25 
     26     if (*s) {
     27         s++;
     28         hour = atoi(s);
     29     }
     30 
     31     tm.tm_year = day / 10000 - 1900;
     32     tm.tm_mon = (day % 10000) / 100 - 1;
     33     tm.tm_mday = day % 100;
     34     tm.tm_hour = hour / 10000;
     35     tm.tm_min = (hour % 10000) / 100;
     36     tm.tm_sec = hour % 100;
     37     tm.tm_isdst = -1;
     38 
     39     return mktime(&tm);
     40 }
     41 
     42 int touch_main(int argc, char *argv[])
     43 {
     44         int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0;
     45         struct timespec specified_time, times[2];
     46         char *file = 0;
     47 
     48         specified_time.tv_nsec = UTIME_NOW;
     49 
     50         for (i = 1; i < argc; i++) {
     51             if (argv[i][0] == '-') {
     52                 /* an option */
     53                 const char *arg = argv[i]+1;
     54                 while (arg[0]) {
     55                     switch (arg[0]) {
     56                     case 'a': aflag = 1; break;
     57                     case 'm': mflag = 1; break;
     58                     case 't':
     59                         if ((i+1) >= argc)
     60                             usage();
     61                         specified_time.tv_sec = parse_time(argv[++i]);
     62                         if (specified_time.tv_sec == -1) {
     63                             fprintf(stderr, "touch: invalid timestamp specified\n");
     64                             exit(1);
     65                         }
     66                         specified_time.tv_nsec = 0;
     67                         break;
     68                     case 'l': flags |= AT_SYMLINK_NOFOLLOW; break;
     69                     case 'd': debug = 1; break;
     70                     default:
     71                         usage();
     72                     }
     73                     arg++;
     74                 }
     75             } else {
     76                 /* not an option, and only accept one filename */
     77                 if (i+1 != argc)
     78                     usage();
     79                 file = argv[i];
     80             }
     81         }
     82 
     83         if (! file) {
     84             fprintf(stderr, "touch: no file specified\n");
     85             exit(1);
     86         }
     87 
     88         if (access(file, F_OK))
     89             if ((fd=creat(file, 0666)) != -1)
     90                 close(fd);
     91 
     92         if ((mflag == 0) && (aflag == 0))
     93             aflag = mflag = 1;
     94 
     95         if (aflag)
     96             times[0] = specified_time;
     97         else
     98             times[0].tv_nsec = UTIME_OMIT;
     99 
    100         if (mflag)
    101             times[1] = specified_time;
    102         else
    103             times[1].tv_nsec = UTIME_OMIT;
    104 
    105         if (debug) {
    106             fprintf(stderr, "file = %s\n", file);
    107             fprintf(stderr, "times[0].tv_sec = %ld, times[0].tv_nsec = %ld\n", times[0].tv_sec, times[0].tv_nsec);
    108             fprintf(stderr, "times[1].tv_sec = %ld, times[1].tv_nsec = %ld\n", times[1].tv_sec, times[1].tv_nsec);
    109             fprintf(stderr, "flags = 0x%8.8x\n", flags);
    110         }
    111 
    112         return utimensat(AT_FDCWD, file, times, flags);
    113 }
    114 
    115