touch.c File Reference

#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <sys/utime.h>
#include <io.h>
#include <fcntl.h>
#include <getopt.h>
#include <various.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

Include dependency graph for touch.c:

Go to the source code of this file.

Macros
#define	DEFFILEMODE   S_IWRITE
#define	ATOI2(ar)   ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;

Functions
int rw	__P ((char *, struct stat *, int))
void stime_arg1	__P ((char *, time_t *))
void stime_arg2	__P ((char *, int, time_t *))
void usage	__P ((void))
int	main (int argc, char *argv[])
void	stime_arg1 (char *arg, time_t *tvp)
void	stime_arg2 (char *arg, int year, time_t *tvp)
void	stime_file (char *fname, time_t *tvp)
int	rw (char *fname, struct stat *sbp, int force)
void	usage ()

Variables
char	copyright []
char *	__progname

Macro Definition Documentation

ATOI2

#define ATOI2

(

ar

)

((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;

Definition at line 197 of file touch.c.

DEFFILEMODE

#define DEFFILEMODE   S_IWRITE

Definition at line 58 of file touch.c.

Function Documentation

__P() [1/4]

void stime_arg2 __P

(

(char *, int, time_t *)

)

__P() [2/4]

int rw __P

(

(char *, struct stat *, int)

)

__P() [3/4]

void stime_file __P

(

(char *, time_t *)

)

__P() [4/4]

void usage __P

(

(void)

)

main()

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

Definition at line 78 of file touch.c.

{
    struct stat sb;
    time_t tv[2];
    int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
    char *p;
    struct utimbuf utb;
 
    __progname = argv[0];
 
    aflag = cflag = fflag = mflag = timeset = 0;
    time(&tv[0]);
 
    while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF)
        switch(ch) {
        case 'a':
            aflag = 1;
            break;
        case 'c':
            cflag = 1;
            break;
        case 'f':
            fflag = 1;
            break;
        case 'm':
            mflag = 1;
            break;
        case 'r':
            timeset = 1;
            stime_file(optarg, tv);
            break;
        case 't':
            timeset = 1;
            stime_arg1(optarg, tv);
            break;
        case '?':
        default:
            usage();
        }
    argc -= optind;
    argv += optind;
 
    /* Default is both -a and -m. */
    if (aflag == 0 && mflag == 0)
        aflag = mflag = 1;
 
    /*
     * If no -r or -t flag, at least two operands, the first of which
     * is an 8 or 10 digit number, use the obsolete time specification.
     */
    if (!timeset && argc > 1) {
        (void)strtol(argv[0], &p, 10);
        len = p - argv[0];
        if (*p == '\0' && (len == 8 || len == 10)) {
            timeset = 1;
            stime_arg2(argv[0], len == 10, tv);
        }
    }
 
    /* Otherwise use the current time of day. */
    if (!timeset)
        tv[1] = tv[0];
 
    if (*argv == NULL)
        usage();
 
    for (rval = 0; *argv; ++argv) {
        /* See if the file exists. */
        if (stat(*argv, &sb)) {
            if (!cflag) {
                /* Create the file. */
                fd = _open(*argv,
                    O_WRONLY | O_CREAT, DEFFILEMODE);
                if (fd == -1 || fstat(fd, &sb) || _close(fd)) {
                    rval = 1;
                    warn("%s", *argv);
                    continue;
                }
 
                /* If using the current time, we're done. */
                if (!timeset)
                    continue;
            } else
                continue;
        }
 
        if (!aflag)
            tv[0] = sb.st_atime;
        if (!mflag)
            tv[1] = sb.st_mtime;
 
        /* Try utime. */
        utb.actime = tv[0];
        utb.modtime = tv[1];
        if (!utime(*argv, &utb))
            continue;
 
        /* If the user specified a time, nothing else we can do. */
        if (timeset) {
            rval = 1;
            warn("%s", *argv);
        }
 
        /*
         * System V and POSIX 1003.1 require that a NULL argument
         * set the access/modification times to the current time.
         * The permission checks are different, too, in that the
         * ability to write the file is sufficient.  Take a shot.
         */
         if (!utime(*argv, NULL))
            continue;
 
        /* Try reading/writing. */
        if (rw(*argv, &sb, fflag))
            rval = 1;
    }
    return rval;
}

rw()

int rw	(	char *	fname,
		struct stat *	sbp,
		int	force
	)

Definition at line 291 of file touch.c.

{
    int fd, needed_chmod, rval;
    u_char byte;
 
    /* Try regular files and directories. */
    if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
        warnx("%s: %s", fname, strerror(0));
        return (1);
    }
 
    needed_chmod = rval = 0;
    if ((fd = _open(fname, O_RDWR, 0)) == -1) {
        if (!force || _chmod(fname, DEFFILEMODE))
            goto err;
        if ((fd = _open(fname, O_RDWR, 0)) == -1)
            goto err;
        needed_chmod = 1;
    }
 
    if (sbp->st_size != 0) {
        if (_read(fd, &byte, sizeof(byte)) != sizeof(byte))
            goto err;
        if (_lseek(fd, (off_t)0, SEEK_SET) == -1)
            goto err;
        if (_write(fd, &byte, sizeof(byte)) != sizeof(byte))
            goto err;
    } else {
        if (_write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
err:            rval = 1;
            warn("%s", fname);
/*      } else if (ftruncate(fd, (off_t)0)) {*/
        } else if (_chsize(fd, (off_t)0)) {
            rval = 1;
            warn("%s: file modified", fname);
        }
    }
 
    if (_close(fd) && rval != 1) {
        rval = 1;
        warn("%s", fname);
    }
    if (needed_chmod && _chmod(fname, sbp->st_mode) && rval != 1) {
        rval = 1;
        warn("%s: permissions modified", fname);
    }
    return (rval);
}

stime_arg1()

void stime_arg1	(	char *	arg,
		time_t *	tvp
	)

Definition at line 200 of file touch.c.

{
    struct tm *t;
    int yearset;
    char *p;
                    /* Start with the current time. */
    if ((t = localtime(&tvp[0])) == NULL)
        err(1, "localtime");
                    /* [[CC]YY]MMDDhhmm[.SS] */
    if ((p = strchr(arg, '.')) == NULL)
        t->tm_sec = 0;      /* Seconds defaults to 0. */
    else {
        if (strlen(p + 1) != 2)
            goto terr;
        *p++ = '\0';
        t->tm_sec = ATOI2(p);
    }
 
    yearset = 0;
    switch(strlen(arg)) {
    case 12:            /* CCYYMMDDhhmm */
        t->tm_year = ATOI2(arg);
        t->tm_year *= 1000;
        yearset = 1;
        /* FALLTHOUGH */
    case 10:            /* YYMMDDhhmm */
        if (yearset) {
            yearset = ATOI2(arg);
            t->tm_year += yearset;
        } else {
            yearset = ATOI2(arg);
            if (yearset < 69)
                t->tm_year = yearset + 2000;
            else
                t->tm_year = yearset + 1900;
        }
        t->tm_year -= 1900; /* Convert to UNIX time. */
        /* FALLTHROUGH */
    case 8:             /* MMDDhhmm */
        t->tm_mon = ATOI2(arg);
        --t->tm_mon;        /* Convert from 01-12 to 00-11 */
        t->tm_mday = ATOI2(arg);
        t->tm_hour = ATOI2(arg);
        t->tm_min = ATOI2(arg);
        break;
    default:
        goto terr;
    }
 
    t->tm_isdst = -1;       /* Figure out DST. */
    tvp[0] = tvp[1] = mktime(t);
    if (tvp[0] == -1)
terr:       errx(1,
    "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
}

Referenced by main().

stime_arg2()

void stime_arg2	(	char *	arg,
		int	year,
		time_t *	tvp
	)

Definition at line 257 of file touch.c.

{
    struct tm *t;
                    /* Start with the current time. */
    if ((t = localtime(&tvp[0])) == NULL)
        err(1, "localtime");
 
    t->tm_mon = ATOI2(arg);     /* MMDDhhmm[yy] */
    --t->tm_mon;            /* Convert from 01-12 to 00-11 */
    t->tm_mday = ATOI2(arg);
    t->tm_hour = ATOI2(arg);
    t->tm_min = ATOI2(arg);
    if (year)
        t->tm_year = ATOI2(arg);
 
    t->tm_isdst = -1;       /* Figure out DST. */
    tvp[0] = tvp[1] = mktime(t);
    if (tvp[0] == -1)
        errx(1,
    "out of range or illegal time specification: MMDDhhmm[yy]");
}

Referenced by main().

stime_file()

void stime_file	(	char *	fname,
		time_t *	tvp
	)

Definition at line 280 of file touch.c.

{
    struct stat sb;
 
    if (stat(fname, &sb))
        err(1, "%s", fname);
    tvp[0] = sb.st_atime;
    tvp[1] = sb.st_mtime;
}

Referenced by main().

usage()

void usage

(

void

)

Definition at line 342 of file touch.c.

{
    (void)fprintf(stderr,
        "usage: touch [-acfm] [-r file] [-t time] file ...\n");
    exit(1);
}

Referenced by main().

Variable Documentation

__progname

char* __progname

Definition at line 68 of file touch.c.

Referenced by main(), verr(), verrx(), vwarn(), and vwarnx().

copyright

char copyright[]

Initial value:

=
"@(#) Copyright (c) 1993 Regents of the University of California.\n\
 All rights reserved.\n"

Definition at line 40 of file touch.c.