Add a new -U flag to instruct ls to use the birthtime for printing or

sorting.

Submitted by:	Andrzej Tobola ato at iem dot pw dot edu dot pl
MFC after:	1 week

7 files changed, 49 insertions, 4 deletions

diff --git a/bin/ls/cmp.c b/bin/ls/cmp.c
index 37b4a75..badd108 100644
--- a/bin/ls/cmp.c
+++ b/bin/ls/cmp.c
@@ -115,6 +115,32 @@ revacccmp(const FTSENT *a, const FTSENT *b)
 }
 
 int
+birthcmp(const FTSENT *a, const FTSENT *b)
+{
+
+	if (b->fts_statp->st_birthtimespec.tv_sec >
+	    a->fts_statp->st_birthtimespec.tv_sec)
+		return (1);
+	if (b->fts_statp->st_birthtimespec.tv_sec <
+	    a->fts_statp->st_birthtimespec.tv_sec)
+		return (-1);
+	if (b->fts_statp->st_birthtimespec.tv_nsec >
+	    a->fts_statp->st_birthtimespec.tv_nsec)
+		return (1);
+	if (b->fts_statp->st_birthtimespec.tv_nsec <
+	    a->fts_statp->st_birthtimespec.tv_nsec)
+		return (-1);
+	return (strcoll(a->fts_name, b->fts_name));
+}
+
+int
+revbirthcmp(const FTSENT *a, const FTSENT *b)
+{
+
+	return (birthcmp(b, a));
+}
+
+int
 statcmp(const FTSENT *a, const FTSENT *b)
 {
 
diff --git a/bin/ls/extern.h b/bin/ls/extern.h
index 02a61f5..f290fbb 100644
--- a/bin/ls/extern.h
+++ b/bin/ls/extern.h
@@ -32,6 +32,8 @@
 
 int	 acccmp(const FTSENT *, const FTSENT *);
 int	 revacccmp(const FTSENT *, const FTSENT *);
+int	 birthcmp(const FTSENT *, const FTSENT *);
+int	 revbirthcmp(const FTSENT *, const FTSENT *);
 int	 modcmp(const FTSENT *, const FTSENT *);
 int	 revmodcmp(const FTSENT *, const FTSENT *);
 int	 namecmp(const FTSENT *, const FTSENT *);
diff --git a/bin/ls/ls.1 b/bin/ls/ls.1
index 4a16679..ce4c65e 100644
--- a/bin/ls/ls.1
+++ b/bin/ls/ls.1
@@ -149,6 +149,8 @@ When used with the
 .Dq ell )
 option, display complete time information for the file, including
 month, day, hour, minute, second, and year.
+.It Fl U
+Use time when file was created for sorting or printing.
 .It Fl W
 Display whiteouts when scanning directories.
 .It Fl Z
diff --git a/bin/ls/ls.c b/bin/ls/ls.c
index f354fc2..4a752ce 100644
--- a/bin/ls/ls.c
+++ b/bin/ls/ls.c
@@ -104,6 +104,7 @@ int termwidth = 80;		/* default terminal width */
 
 /* flags */
        int f_accesstime;	/* use time of last access */
+       int f_birthtime;		/* use time of birth */
        int f_flags;		/* show flags associated with a file */
        int f_humanval;		/* show human-readable file sizes */
        int f_inode;		/* print inode */
@@ -178,7 +179,7 @@ main(int argc, char *argv[])
 
 	fts_options = FTS_PHYSICAL;
  	while ((ch = getopt(argc, argv,
-	    "1ABCFGHILPRSTWZabcdfghiklmnopqrstuwx")) != -1) {
+	    "1ABCFGHILPRSTUWZabcdfghiklmnopqrstuwx")) != -1) {
 		switch (ch) {
 		/*
 		 * The -1, -C, -x and -l options all override each other so
@@ -207,14 +208,21 @@ main(int argc, char *argv[])
 			f_longform = 0;
 			f_singlecol = 0;
 			break;
-		/* The -c and -u options override each other. */
+		/* The -c, -u, and -U options override each other. */
 		case 'c':
 			f_statustime = 1;
 			f_accesstime = 0;
+			f_birthtime = 0;
 			break;
 		case 'u':
 			f_accesstime = 1;
 			f_statustime = 0;
+			f_birthtime = 0;
+			break;
+		case 'U':
+			f_birthtime = 1;
+			f_accesstime = 0;
+			f_statustime = 0;
 			break;
 		case 'F':
 			f_type = 1;
@@ -410,6 +418,8 @@ main(int argc, char *argv[])
 			sortfcn = revnamecmp;
 		else if (f_accesstime)
 			sortfcn = revacccmp;
+		else if (f_birthtime)
+			sortfcn = revbirthcmp;
 		else if (f_statustime)
 			sortfcn = revstatcmp;
 		else if (f_sizesort)
@@ -421,6 +431,8 @@ main(int argc, char *argv[])
 			sortfcn = namecmp;
 		else if (f_accesstime)
 			sortfcn = acccmp;
+		else if (f_birthtime)
+			sortfcn = birthcmp;
 		else if (f_statustime)
 			sortfcn = statcmp;
 		else if (f_sizesort)
diff --git a/bin/ls/ls.h b/bin/ls/ls.h
index d4e5db6..4d12b22 100644
--- a/bin/ls/ls.h
+++ b/bin/ls/ls.h
@@ -38,6 +38,7 @@
 extern long blocksize;		/* block size units */
 
 extern int f_accesstime;	/* use time of last access */
+extern int f_birthtime;	/* use time of file creation */
 extern int f_flags;		/* show flags associated with a file */
 extern int f_humanval;		/* show human-readable file sizes */
 extern int f_label;		/* show MAC label */
diff --git a/bin/ls/print.c b/bin/ls/print.c
index 185b418..8ca40e2 100644
--- a/bin/ls/print.c
+++ b/bin/ls/print.c
@@ -190,6 +190,8 @@ printlong(const DISPLAY *dp)
 			printsize(dp->s_size, sp->st_size);
 		if (f_accesstime)
 			printtime(sp->st_atime);
+		else if (f_birthtime)
+			printtime(sp->st_birthtime);
 		else if (f_statustime)
 			printtime(sp->st_ctime);
 		else
diff --git a/bin/ls/util.c b/bin/ls/util.c
index 01ae6cb..62fa75a 100644
--- a/bin/ls/util.c
+++ b/bin/ls/util.c
@@ -222,9 +222,9 @@ usage(void)
 {
 	(void)fprintf(stderr,
 #ifdef COLORLS
-	"usage: ls [-ABCFGHILPRSTWZabcdfghiklmnopqrstuwx1]"
+	"usage: ls [-ABCFGHILPRSTUWZabcdfghiklmnopqrstuwx1]"
 #else
-	"usage: ls [-ABCFHILPRSTWZabcdfghiklmnopqrstuwx1]"
+	"usage: ls [-ABCFHILPRSTUWZabcdfghiklmnopqrstuwx1]"
 #endif
 		      " [file ...]\n");
 	exit(1);