From 75e90b15482184db83f03c67b53d4220888c6c9d Mon Sep 17 00:00:00 2001
From: Denys Vlasenko
Date: Fri, 14 Jul 2017 10:47:18 +0200
Subject: cat: fix "cat -An" ignoring -n; make numbering go througn all files

function                                             old     new   delta
cat_main                                             418     428     +10

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 coreutils/cat.c              | 44 +++++++++++++++++++++++++++++---------------
 coreutils/nl.c               | 20 --------------------
 libbb/print_numbered_lines.c |  1 +
 3 files changed, 30 insertions(+), 35 deletions(-)

diff --git a/coreutils/cat.c b/coreutils/cat.c
index 178f96b..a9ba68d 100644
--- a/coreutils/cat.c
+++ b/coreutils/cat.c
@@ -101,27 +101,32 @@
  * to achieve "cat -v" effect. The actual effect would be "users pissed off
  * by gratuitous incompatibility".
  */
-#define CATV_OPT_e (1<<0)
-#define CATV_OPT_t (1<<1)
-#define CATV_OPT_v (1<<2)
+#define CAT_OPT_e (1<<0)
+#define CAT_OPT_t (1<<1)
+#define CAT_OPT_v (1<<2)
+/* -A occupies bit (1<<3) */
+#define CAT_OPT_n ((1<<4) * ENABLE_FEATURE_CATN)
+#define CAT_OPT_b ((1<<5) * ENABLE_FEATURE_CATN)
 static int catv(unsigned opts, char **argv)
 {
 	int retval = EXIT_SUCCESS;
 	int fd;
+#if ENABLE_FEATURE_CATN
+	unsigned lineno = 0;
+	unsigned eol_char = (opts & (CAT_OPT_n|CAT_OPT_b)) ? '\n' : 0x100;
+	unsigned skip_num_on = (opts & CAT_OPT_b) ? '\n' : 0x100;
+	bool eol_seen = 1;
+#endif
 
-	BUILD_BUG_ON(CATV_OPT_e != VISIBLE_ENDLINE);
-	BUILD_BUG_ON(CATV_OPT_t != VISIBLE_SHOW_TABS);
+	BUILD_BUG_ON(CAT_OPT_e != VISIBLE_ENDLINE);
+	BUILD_BUG_ON(CAT_OPT_t != VISIBLE_SHOW_TABS);
 #if 0 /* These consts match, we can just pass "opts" to visible() */
-	if (opts & CATV_OPT_e)
+	if (opts & CAT_OPT_e)
 		flags |= VISIBLE_ENDLINE;
-	if (opts & CATV_OPT_t)
+	if (opts & CAT_OPT_t)
 		flags |= VISIBLE_SHOW_TABS;
 #endif
 
-	/* Read from stdin if there's nothing else to do. */
-	if (!argv[0])
-		*--argv = (char*)"-";
-
 #define read_buf bb_common_bufsiz1
 	setup_common_bufsiz();
 	do {
@@ -141,6 +146,11 @@ static int catv(unsigned opts, char **argv)
 			for (i = 0; i < res; i++) {
 				unsigned char c = read_buf[i];
 				char buf[sizeof("M-^c")];
+#if ENABLE_FEATURE_CATN
+				if (eol_seen && c != skip_num_on)
+					printf("%6u  ", ++lineno);
+				eol_seen = (c == eol_char);
+#endif
 				visible(c, buf, opts);
 				fputs(buf, stdout);
 			}
@@ -151,12 +161,13 @@ static int catv(unsigned opts, char **argv)
 
 	fflush_stdout_and_exit(retval);
 }
+#undef CAT_OPT_n
+#undef CAT_OPT_b
 #endif
 
 int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cat_main(int argc UNUSED_PARAM, char **argv)
 {
-	struct number_state ns;
 	unsigned opts;
 
 	IF_FEATURE_CATV(opt_complementary = "Aetv"; /* -A == -vet */)
@@ -164,10 +175,13 @@ int cat_main(int argc UNUSED_PARAM, char **argv)
 	opts = getopt32(argv, IF_FEATURE_CATV("etvA") IF_FEATURE_CATN("nb") "u");
 	argv += optind;
 
+	/* Read from stdin if there's nothing else to do. */
+	if (!argv[0])
+		*--argv = (char*)"-";
+
 #if ENABLE_FEATURE_CATV
 	if (opts & 7)
 		return catv(opts, argv);
-//BUG: -v,-e,-t,-A ignore -nb
 	opts >>= 4;
 #endif
 
@@ -175,8 +189,8 @@ int cat_main(int argc UNUSED_PARAM, char **argv)
 # define CAT_OPT_n (1<<0)
 # define CAT_OPT_b (1<<1)
 	if (opts & (CAT_OPT_n|CAT_OPT_b)) { /* -n or -b */
-		if (!*argv)
-			*--argv = (char*)"-";
+		struct number_state ns;
+
 		ns.width = 6;
 		ns.start = 1;
 		ns.inc = 1;
diff --git a/coreutils/nl.c b/coreutils/nl.c
index 5c64923..dc468a9 100644
--- a/coreutils/nl.c
+++ b/coreutils/nl.c
@@ -35,26 +35,6 @@
 
 #include "libbb.h"
 
-void FAST_FUNC print_numbered_lines(struct number_state *ns, const char *filename)
-{
-	FILE *fp = fopen_or_warn_stdin(filename);
-	unsigned N = ns->start;
-	char *line;
-
-	while ((line = xmalloc_fgetline(fp)) != NULL) {
-		if (ns->all
-		 || (ns->nonempty && line[0])
-		) {
-			printf("%*u%s%s\n", ns->width, N, ns->sep, line);
-			N += ns->inc;
-		} else if (ns->empty_str)
-			fputs(ns->empty_str, stdout);
-		free(line);
-	}
-
-	fclose(fp);
-}
-
 int nl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int nl_main(int argc UNUSED_PARAM, char **argv)
 {
diff --git a/libbb/print_numbered_lines.c b/libbb/print_numbered_lines.c
index 702aed1..9a8a514 100644
--- a/libbb/print_numbered_lines.c
+++ b/libbb/print_numbered_lines.c
@@ -24,6 +24,7 @@ void FAST_FUNC print_numbered_lines(struct number_state *ns, const char *filenam
 			fputs(ns->empty_str, stdout);
 		free(line);
 	}
+	ns->start = N;
 
 	fclose(fp);
 }
-- 
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