[hackers] [sbase] touch: Add support for -a and -m || sin

[git]

commit 4ffe0ef0d1c38bb9be49639ce0c5744257cb06d1
Author: sin <s...@2f30.org>
Date:   Tue Jan 20 11:15:18 2015 +0000

    touch: Add support for -a and -m
    
    Update the manpage.

diff --git a/touch.1 b/touch.1
index 60d0a93..415e2a3 100644
--- a/touch.1
+++ b/touch.1
@@ -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
diff --git a/touch.c b/touch.c
index 5a3bd8d..0af4e8b 100644
--- a/touch.c
+++ b/touch.c
@@ -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);
 }