From 894466cc5182a022051868ede316f378071020cd Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Thu, 17 Jun 2021 00:36:13 +0200
Subject: [PATCH] uniq: support -z

function                                             old     new   delta
uniq_main                                            391     427     +36
packed_usage                                       33570   33549     -21
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 36/-21)             Total: 15 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 coreutils/sort.c   |  2 +-
 coreutils/uniq.c   | 22 +++++++++++++---------
 modutils/modinfo.c |  2 +-
 3 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/coreutils/sort.c b/coreutils/sort.c
index 6c4e3038c..32a06e40a 100644
--- a/coreutils/sort.c
+++ b/coreutils/sort.c
@@ -67,7 +67,7 @@
 //usage:     "\n	-r	Reverse sort order"
 //usage:     "\n	-s	Stable (don't sort ties alphabetically)"
 //usage:     "\n	-u	Suppress duplicate lines"
-//usage:     "\n	-z	Lines are terminated by NUL, not newline"
+//usage:     "\n	-z	NUL terminated input and output"
 ///////:     "\n	-m	Ignored for GNU compatibility"
 ///////:     "\n	-S BUFSZ Ignored for GNU compatibility"
 ///////:     "\n	-T TMPDIR Ignored for GNU compatibility"
diff --git a/coreutils/uniq.c b/coreutils/uniq.c
index e1594286f..ef50981ed 100644
--- a/coreutils/uniq.c
+++ b/coreutils/uniq.c
@@ -20,13 +20,14 @@
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
 
 //usage:#define uniq_trivial_usage
-//usage:       "[-cdui] [-f,s,w N] [INPUT [OUTPUT]]"
+//usage:       "[-cduiz] [-f,s,w N] [FILE [OUTFILE]]"
 //usage:#define uniq_full_usage "\n\n"
 //usage:       "Discard duplicate lines\n"
 //usage:     "\n	-c	Prefix lines by the number of occurrences"
 //usage:     "\n	-d	Only print duplicate lines"
 //usage:     "\n	-u	Only print unique lines"
 //usage:     "\n	-i	Ignore case"
+//usage:     "\n	-z	NUL terminated output"
 //usage:     "\n	-f N	Skip first N fields"
 //usage:     "\n	-s N	Skip first N chars (after any skipped fields)"
 //usage:     "\n	-w N	Compare N characters in line"
@@ -45,17 +46,19 @@ int uniq_main(int argc UNUSED_PARAM, char **argv)
 	const char *input_filename;
 	unsigned skip_fields, skip_chars, max_chars;
 	unsigned opt;
+	char eol;
 	char *cur_line;
 	const char *cur_compare;
 
 	enum {
-		OPT_c = 0x1,
-		OPT_d = 0x2, /* print only dups */
-		OPT_u = 0x4, /* print only uniq */
-		OPT_f = 0x8,
-		OPT_s = 0x10,
-		OPT_w = 0x20,
-		OPT_i = 0x40,
+		OPT_c = 1 << 0,
+		OPT_d = 1 << 1, /* print only dups */
+		OPT_u = 1 << 2, /* print only uniq */
+		OPT_f = 1 << 3,
+		OPT_s = 1 << 4,
+		OPT_w = 1 << 5,
+		OPT_i = 1 << 6,
+		OPT_z = 1 << 7,
 	};
 
 	skip_fields = skip_chars = 0;
@@ -86,6 +89,7 @@ int uniq_main(int argc UNUSED_PARAM, char **argv)
 	}
 
 	cur_compare = cur_line = NULL; /* prime the pump */
+	eol = (opt & OPT_z) ? 0 : '\n';
 
 	do {
 		unsigned i;
@@ -127,7 +131,7 @@ int uniq_main(int argc UNUSED_PARAM, char **argv)
 					/* %7lu matches GNU coreutils 6.9 */
 					printf("%7lu ", dups + 1);
 				}
-				puts(old_line);
+				printf("%s%c", old_line, eol);
 			}
 			free(old_line);
 		}
diff --git a/modutils/modinfo.c b/modutils/modinfo.c
index d15772f0d..0a86c3296 100644
--- a/modutils/modinfo.c
+++ b/modutils/modinfo.c
@@ -131,7 +131,7 @@ static void modinfo(const char *path, const char *version,
 //usage:     "\n	-p		Shortcut for '-F parm'"
 ////usage:     "\n	-n		Shortcut for '-F filename'"
 //usage:     "\n	-F keyword	Keyword to look for"
-//usage:     "\n	-0		Separate output with NULs"
+//usage:     "\n	-0		NUL terminated output"
 //usage:#define modinfo_example_usage
 //usage:       "$ modinfo -F vermagic loop\n"