Merge "Lose touch to toybox."

    start \

    stop \

    top \

    touch \

    umount \

    uptime \

    watchprops \

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <fcntl.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <fcntl.h>

#include <time.h>

#include <unistd.h>

static void usage(void)

{

        fprintf(stderr, "touch: usage: touch [-alm] [-t YYYYMMDD[.hhmmss]] <file>\n");

        exit(1);

}

static time_t parse_time(char *s)

{

    struct tm tm;

    int day = atoi(s);

    int hour = 0;

    while (*s && *s != '.') {

        s++;

    }

    if (*s) {

        s++;

        hour = atoi(s);

    }

    tm.tm_year = day / 10000 - 1900;

    tm.tm_mon = (day % 10000) / 100 - 1;

    tm.tm_mday = day % 100;

    tm.tm_hour = hour / 10000;

    tm.tm_min = (hour % 10000) / 100;

    tm.tm_sec = hour % 100;

    tm.tm_isdst = -1;

    return mktime(&tm);

}

int touch_main(int argc, char *argv[])

{

        int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0;

        struct timespec specified_time, times[2];

        char *file = 0;

        specified_time.tv_nsec = UTIME_NOW;

        for (i = 1; i < argc; i++) {

            if (argv[i][0] == '-') {

                /* an option */

                const char *arg = argv[i]+1;

                while (arg[0]) {

                    switch (arg[0]) {

                    case 'a': aflag = 1; break;

                    case 'm': mflag = 1; break;

                    case 't':

                        if ((i+1) >= argc)

                            usage();

                        specified_time.tv_sec = parse_time(argv[++i]);

                        if (specified_time.tv_sec == -1) {

                            fprintf(stderr, "touch: invalid timestamp specified\n");

                            exit(1);

                        }

                        specified_time.tv_nsec = 0;

                        break;

                    case 'l': flags |= AT_SYMLINK_NOFOLLOW; break;

                    case 'd': debug = 1; break;

                    default:

                        usage();

                    }

                    arg++;

                }

            } else {

                /* not an option, and only accept one filename */

                if (i+1 != argc)

                    usage();

                file = argv[i];

            }

        }

        if (! file) {

            fprintf(stderr, "touch: no file specified\n");

            exit(1);

        }

        if (access(file, F_OK))

            if ((fd=creat(file, 0666)) != -1)

                close(fd);

        if ((mflag == 0) && (aflag == 0))

            aflag = mflag = 1;

        if (aflag)

            times[0] = specified_time;

        else

            times[0].tv_nsec = UTIME_OMIT;

        if (mflag)

            times[1] = specified_time;

        else

            times[1].tv_nsec = UTIME_OMIT;

        if (debug) {

            fprintf(stderr, "file = %s\n", file);

            fprintf(stderr, "times[0].tv_sec = %ld, times[0].tv_nsec = %ld\n", times[0].tv_sec, times[0].tv_nsec);

            fprintf(stderr, "times[1].tv_sec = %ld, times[1].tv_nsec = %ld\n", times[1].tv_sec, times[1].tv_nsec);

            fprintf(stderr, "flags = 0x%8.8x\n", flags);

        }

        return utimensat(AT_FDCWD, file, times, flags);

}