cmd/touch/touch.c

	touch.c revision 3b862e9a9ce59d5dbf0177b9eb293109fde6bf36
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*  Copyright (c) 1987, 1988 Microsoft Corporation  */
/*    All Rights Reserved   */

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <ctype.h>
#include <libgen.h>
#include <fcntl.h>
#include <pwd.h>
#include <time.h>
#include <unistd.h>
#include <locale.h>
#include <sys/time.h>
#include <errno.h>

#define BADTIME "bad time specification"

static char *myname;

static int isnumber(char *);
static int atoi_for2(char *);
static void usage(const int);
static void touchabort(const char *);
static void parse_datetime(char *, timespec_t *);
static void parse_time(char *, timespec_t *);
static void parse_timespec(char *, timespec_t *);

int
main(int argc, char *argv[])
{
    int c;

    int     aflag   = 0;
    int     cflag   = 0;
    int     rflag   = 0;
    int     mflag   = 0;
    int     tflag   = 0;
    int     stflag  = 0;
    int     status  = 0;
    int     usecurrenttime = 1;
    int     timespecified;
    int     optc;
    int     fd = -1;
    mode_t      cmode =
        (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
    struct stat stbuf;
    struct stat prstbuf;
    timespec_t  times[2];
    timespec_t  *tsp;

    (void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
    (void) textdomain(TEXT_DOMAIN);

    myname = basename(argv[0]);
    if (strcmp(myname, "settime") == 0) {
        cflag++;
        stflag++;
        while ((optc = getopt(argc, argv, "f:")) != EOF) {
            switch (optc) {
            case 'f':
                rflag++;
                usecurrenttime = 0;
                if (stat(optarg, &prstbuf) == -1) {
                    (void) fprintf(stderr, "%s: ", myname);
                    perror(optarg);
                    return (2);
                }
                break;
            case '?':
                usage(stflag);
                break;
            }
        }
    } else {
        while ((optc = getopt(argc, argv, "acfmr:d:t:")) != EOF) {
            switch (optc) {
            case 'a':
                aflag++;
                break;
            case 'c':
                cflag++;
                break;
            case 'f':   /* silently ignore for UCB compat */
                break;
            case 'm':
                mflag++;
                break;
            case 'r':   /* same as settime's -f option */
                rflag++;
                usecurrenttime = 0;
                if (stat(optarg, &prstbuf) == -1) {
                    (void) fprintf(stderr, "%s: ", myname);
                    perror(optarg);
                    return (2);
                }
                break;
            case 'd':
                tflag++;
                usecurrenttime = 0;
                parse_datetime(optarg, &prstbuf.st_mtim);
                prstbuf.st_atim = prstbuf.st_mtim;
                break;
            case 't':
                tflag++;
                usecurrenttime = 0;
                parse_time(optarg, &prstbuf.st_mtim);
                prstbuf.st_atim = prstbuf.st_mtim;
                break;
            case '?':
                usage(stflag);
                break;
            }
        }
    }

    argc -= optind;
    argv += optind;

    if ((argc < 1) || (rflag + tflag > 1))
        usage(stflag);

    if ((aflag == 0) && (mflag == 0)) {
        aflag = 1;
        mflag = 1;
    }
    if ((aflag && !mflag) || (mflag && !aflag))
        usecurrenttime = 0;

    /*
     * If -r, -t or -d has been specified,
     * use the specified time.
     */
    timespecified = (rflag | tflag);

    if (timespecified == 0 && argc >= 2 && isnumber(*argv) &&
        (strlen(*argv) == 8 || strlen(*argv) == 10)) {
        /*
         * time is specified as an operand; use it.
         */
        parse_timespec(*argv++, &prstbuf.st_mtim);
        prstbuf.st_atim = prstbuf.st_mtim;
        usecurrenttime = 0;
        timespecified = 1;
        argc--;
    }

    for (c = 0; c < argc; c++) {
        if (stat(argv[c], &stbuf)) {
            /*
             * If stat failed for reasons other than EOVERFLOW or
             * ENOENT, the file should not be created, since this
             * can clobber the contents of an existing file.
             */
            if (errno == EOVERFLOW) {
                /*
                 * Since we have EOVERFLOW,
                 * we know the file exists.
                 */
                /* EMPTY */;
            } else if (errno != ENOENT) {
                (void) fprintf(stderr,
                    gettext("%s: cannot stat %s: %s\n"),
                    myname, argv[c], strerror(errno));
                status++;
                continue;
            } else if (cflag) {
                continue;
            } else if ((fd = creat(argv[c], cmode)) < 0) {
                (void) fprintf(stderr,
                    gettext("%s: cannot create %s: %s\n"),
                    myname, argv[c], strerror(errno));
                status++;
                continue;
            }
        }

        if (usecurrenttime) {
            tsp = NULL;
        } else {
            if (mflag == 0) {
                /* Keep the mtime of the file */
                times[1].tv_nsec = UTIME_OMIT;
            } else if (timespecified) {
                /* Set the specified time */
                times[1] = prstbuf.st_mtim;
            } else {
                /* Otherwise, use the current time */
                times[1].tv_nsec = UTIME_NOW;
            }

            if (aflag == 0) {
                /* Keep the atime of the file */
                times[0].tv_nsec = UTIME_OMIT;
            } else if (timespecified) {
                /* Set the specified time */
                times[0] = prstbuf.st_atim;
            } else {
                /* Otherwise, use the current time */
                times[0].tv_nsec = UTIME_NOW;
            }

            tsp = times;
        }

        if ((fd >= 0 && futimens(fd, tsp) != 0) ||
            utimensat(AT_FDCWD, argv[c], tsp, 0) != 0) {
            (void) fprintf(stderr,
                gettext("%s: cannot change times on %s: %s\n"),
                myname, argv[c], strerror(errno));
            status++;
        }
        if (fd >= 0) {
            (void) close(fd);
            fd = -1;
        }
    }
    return (status);
}

static int
isnumber(char *s)
{
    int c;

    while ((c = *s++) != '\0')
        if (!isdigit(c))
            return (0);
    return (1);
}

static void
parse_datetime(char *t, timespec_t *ts)
{
    char        date[64];
    char        *year;
    char        *month;
    char        *day;
    char        *hour;
    char        *minute;
    char        *second;
    char        *fraction;
    int     utc = 0;
    char        *p;
    time_t      when;
    int     nanoseconds;
    struct tm   tm;

    /*
     * The date string has the format (defined by the touch(1) spec):
     *  YYYY-MM-DDThh:mm:SS[.frac][tz]
     *  YYYY-MM-DDThh:mm:SS[,frac][tz]
     * T is either the literal 'T' or is a space character.
     * tz is either empty (local time) or the literal 'Z' (UTC).
     * All other fields are strings of digits.
     */

    /*
     * Make a copy of the date string so it can be tokenized.
     */
    if (strlcpy(date, t, sizeof (date)) >= sizeof (date))
        touchabort(BADTIME);

    /* deal with the optional trailing 'Z' first */
    p = date + strlen(date) - 1;
    if (*p == 'Z') {
        utc = 1;
        *p = '\0';
    }

    /* break out the component tokens */
    p = date;
    year = strsep(&p, "-");
    month = strsep(&p, "-");
    day = strsep(&p, "T ");
    hour = strsep(&p, ":");
    minute = strsep(&p, ":");
    second = strsep(&p, ".,");
    fraction = p;

    /* verify the component tokens */
    if (year == NULL || strlen(year) < 4 || !isnumber(year) ||
        month == NULL || strlen(month) != 2 || !isnumber(month) ||
        day == NULL || strlen(day) != 2 || !isnumber(day) ||
        hour == NULL || strlen(hour) != 2 || !isnumber(hour) ||
        minute == NULL || strlen(minute) != 2 || !isnumber(minute) ||
        second == NULL || strlen(second) != 2 || !isnumber(second) ||
        (fraction != NULL && (*fraction == '\0' || !isnumber(fraction))))
        touchabort(BADTIME);

    (void) memset(&tm, 0, sizeof (struct tm));

    tm.tm_year = atoi(year) - 1900;
    tm.tm_mon = atoi(month) - 1;
    tm.tm_mday = atoi(day);
    tm.tm_hour = atoi(hour);
    tm.tm_min = atoi(minute);
    tm.tm_sec = atoi(second);
    if (utc) {
        (void) setenv("TZ", "GMT0", 1);
        tzset();
    }

    errno = 0;
    if ((when = mktime(&tm)) == -1 && errno != 0)
        touchabort(BADTIME);
    if (tm.tm_isdst)
        when -= (timezone - altzone);

    if (fraction == NULL) {
        nanoseconds = 0;
    } else {
        /* truncate beyond 9 digits (nanoseconds) */
        if (strlen(fraction) > 9)
            fraction[9] = '\0';
        nanoseconds = atoi(fraction);

        switch (strlen(fraction)) {
        case 1:
            nanoseconds *= 100000000;
            break;
        case 2:
            nanoseconds *= 10000000;
            break;
        case 3:
            nanoseconds *= 1000000;
            break;
        case 4:
            nanoseconds *= 100000;
            break;
        case 5:
            nanoseconds *= 10000;
            break;
        case 6:
            nanoseconds *= 1000;
            break;
        case 7:
            nanoseconds *= 100;
            break;
        case 8:
            nanoseconds *= 10;
            break;
        case 9:
            break;
        }
    }

    ts->tv_sec = when;
    ts->tv_nsec = nanoseconds;
}

static void
parse_time(char *t, timespec_t *ts)
{
    int     century = 0;
    int     seconds = 0;
    char        *p;
    time_t      when;
    struct tm   tm;

    /*
     * time in the following format (defined by the touch(1) spec):
     *  [[CC]YY]MMDDhhmm[.SS]
     */
    if ((p = strchr(t, '.')) != NULL) {
        if (strchr(p+1, '.') != NULL)
            touchabort(BADTIME);
        seconds = atoi_for2(p+1);
        *p = '\0';
    }

    (void) memset(&tm, 0, sizeof (struct tm));
    when = time(0);
    tm.tm_year = localtime(&when)->tm_year;

    switch (strlen(t)) {
        case 12:    /* CCYYMMDDhhmm */
            century = atoi_for2(t);
            t += 2;
            /* FALLTHROUGH */
        case 10:    /* YYMMDDhhmm */
            tm.tm_year = atoi_for2(t);
            t += 2;
            if (century == 0) {
                if (tm.tm_year < 69)
                    tm.tm_year += 100;
            } else
                tm.tm_year += (century - 19) * 100;
            /* FALLTHROUGH */
        case 8:     /* MMDDhhmm */
            tm.tm_mon = atoi_for2(t) - 1;
            t += 2;
            tm.tm_mday = atoi_for2(t);
            t += 2;
            tm.tm_hour = atoi_for2(t);
            t += 2;
            tm.tm_min = atoi_for2(t);
            tm.tm_sec = seconds;
            break;
        default:
            touchabort(BADTIME);
    }

    if ((when = mktime(&tm)) == -1)
        touchabort(BADTIME);
    if (tm.tm_isdst)
        when -= (timezone-altzone);

    ts->tv_sec = when;
    ts->tv_nsec = 0;
}

static void
parse_timespec(char *t, timespec_t *ts)
{
    time_t      when;
    struct tm   tm;

    /*
     * time in the following format (defined by the touch(1) spec):
     *  MMDDhhmm[yy]
     */

    (void) memset(&tm, 0, sizeof (struct tm));
    when = time(0);
    tm.tm_year = localtime(&when)->tm_year;

    switch (strlen(t)) {
        case 10:    /* MMDDhhmmyy */
            tm.tm_year = atoi_for2(t+8);
            if (tm.tm_year < 69)
                tm.tm_year += 100;
            /* FALLTHROUGH */
        case 8:     /* MMDDhhmm */
            tm.tm_mon = atoi_for2(t) - 1;
            t += 2;
            tm.tm_mday = atoi_for2(t);
            t += 2;
            tm.tm_hour = atoi_for2(t);
            t += 2;
            tm.tm_min = atoi_for2(t);
            break;
        default:
            touchabort(BADTIME);
    }

    if ((when = mktime(&tm)) == -1)
        touchabort(BADTIME);
    if (tm.tm_isdst)
        when -= (timezone - altzone);

    ts->tv_sec = when;
    ts->tv_nsec = 0;
}

static int
atoi_for2(char *p)
{
    int value;

    value = (*p - '0') * 10 + *(p+1) - '0';
    if ((value < 0) || (value > 99))
        touchabort(BADTIME);
    return (value);
}

static void
touchabort(const char *message)
{
    (void) fprintf(stderr, "%s: %s\n", myname, gettext(message));
    exit(1);
}

static void
usage(const int settime)
{
    if (settime) {
        (void) fprintf(stderr, gettext(
            "usage: %s [-f file] [mmddhhmm[yy]] file...\n"), myname);
        exit(2);
    }
    (void) fprintf(stderr, gettext(
        "usage: %s [-acm] [-r ref_file] file...\n"
        "       %s [-acm] [-t [[CC]YY]MMDDhhmm[.SS]] file...\n"
        "       %s [-acm] [-d YYYY-MM-DDThh:mm:SS[.frac][Z]] file...\n"
        "       %s [-acm] [-d YYYY-MM-DDThh:mm:SS[,frac][Z]] file...\n"
        "       %s [-acm] [MMDDhhmm[yy]] file...\n"),
        myname, myname, myname, myname, myname);
    exit(2);
}