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touch: Add support for -a and -m

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Update the manpage.
This commit is contained in:
sin 2015-01-20 11:15:18 +00:00
parent 8b623f8593
commit 45c54bff0b
2 changed files with 58 additions and 41 deletions
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56
touch.1
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@ -1,25 +1,31 @@
.TH TOUCH 1 sbase\-VERSION
.SH NAME
touch \- set files' timestamps
.SH SYNOPSIS
.B touch
.RB [ \-c ]
.RB [ \-t
.IR time ]
.RI [ file ...]
.SH DESCRIPTION
.B touch
sets the given files' modification time to the current time. If a file does not
exist it is created.
.SH OPTIONS
.TP
.B \-c
do not create files if they do not exist.
.TP
.BI \-t " time"
sets the files' modification time to
.IR time ,
given as the number of seconds since the Unix epoch.
.SH SEE ALSO
.IR utime (2),
.IR creat (2)
.Dd January 20, 2014
.Dt TOUCH 1 sbase\-VERSION
.Sh NAME
.Nm touch
.Nd set file timestamps
.Sh SYNOPSIS
.Nm touch
.Op Fl acm
.Op Fl t Ar stamp
.Ar file ...
.Sh DESCRIPTION
.Nm
sets the access and modification times of files to the current time of day. If the file
doesn't exist, it is created with the default permissions.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl a
Set the access time of the file.
.It Fl c
Do not create the file it it does not exist. The exit
status is not affected.
.It Fl m
Change the modification time of the file.
.It Fl t Ar stamp
Set the timestamp to be used with
.Op Fl am .
The format of the timestamp is simply the number of seconds
since Jan 1, 1970. This specification of time does not conform
to POSIX.
.Sh SEE ALSO
.Xr date 1

43
touch.c
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@ -11,13 +11,15 @@
static void touch(const char *);
static int cflag = 0;
static int aflag;
static int cflag;
static int mflag;
static time_t t;
static void
usage(void)
{
eprintf("usage: %s [-c] [-t stamp] file...\n", argv0);
eprintf("usage: %s [-acm] [-t stamp] file ...\n", argv0);
}
int
@ -26,9 +28,15 @@ main(int argc, char *argv[])
t = time(NULL);
ARGBEGIN {
case 'a':
aflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'm':
mflag = 1;
break;
case 't':
t = estrtol(EARGF(usage()), 0);
break;
@ -46,26 +54,29 @@ main(int argc, char *argv[])
}
static void
touch(const char *str)
touch(const char *file)
{
int fd;
struct stat st;
struct utimbuf ut;
int r;
if (stat(str, &st) == 0) {
ut.actime = st.st_atime;
ut.modtime = t;
if (utime(str, &ut) < 0)
eprintf("utime %s:", str);
if ((r = stat(file, &st)) < 0) {
if (errno != ENOENT)
eprintf("stat %s:", file);
if (cflag)
return;
} else if (r == 0) {
ut.actime = aflag ? t : st.st_atime;
ut.modtime = mflag ? t : st.st_mtime;
if (utime(file, &ut) < 0)
eprintf("utime %s:", file);
return;
}
else if (errno != ENOENT)
eprintf("stat %s:", str);
else if (cflag)
return;
if ((fd = open(str, O_CREAT|O_EXCL,
S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) < 0)
eprintf("open %s:", str);
if ((fd = open(file, O_CREAT | O_EXCL, 0644)) < 0)
eprintf("open %s:", file);
close(fd);
touch(str);
touch(file);
}