Merge "Update the touch command to take a human readable timestamp"

#include <sys/stat.h>

#include <stdlib.h>

#include <fcntl.h>

#include <time.h>

static void usage(void)

{

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

        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;

                    case 't':

                        if ((i+1) >= argc)

                            usage();

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

                        if (specified_time.tv_sec == 0) {

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

                        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;