wc(1): Fix 'wc -L'

I inadvertently broke 'wc -L' in r326736.  We must skip the fast path if -L
was specified, in addition to the existing check for the -l option.

Document long-standing -L behavior (count varies depending on whether wc(1)
is run with the -m option or not) in wc.1.  That behavior dates back to the
introduction of the -L option, but was not documented.

PR:		230300
Reported by:	<amstrnad+bugzilla AT gmail.com>
Sponsored by:	Dell EMC Isilon

2 files changed, 12 insertions, 13 deletions

diff --git a/usr.bin/wc/wc.1 b/usr.bin/wc/wc.1
index 63cbe4ccfb76..c31bb865385e 100644
--- a/usr.bin/wc/wc.1
+++ b/usr.bin/wc/wc.1
@@ -31,7 +31,7 @@
 .\"     @(#)wc.1	8.2 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd December 1, 2015
+.Dd August 2, 2018
 .Dt WC 1
 .Os
 .Sh NAME
@@ -76,8 +76,11 @@ See
 .Xr xo_parse_args 3
 for details on command line arguments.
 .It Fl L
-The number of characters in the longest input line
-is written to the standard output.
+Write the length of the line containing the most bytes (default) or characters
+(when
+.Fl m
+is provided)
+to standard output.
 When more than one
 .Ar file
 argument is specified, the longest input line of
diff --git a/usr.bin/wc/wc.c b/usr.bin/wc/wc.c
index 67d6f51092d4..c2990035c0c7 100644
--- a/usr.bin/wc/wc.c
+++ b/usr.bin/wc/wc.c
@@ -216,7 +216,7 @@ cnt(const char *file)
 	 * If all we need is the number of characters and it's a regular file,
 	 * just stat it.
 	 */
-	if (doline == 0) {
+	if (doline == 0 && dolongline == 0) {
 		if (fstat(fd, &sb)) {
 			xo_warn("%s: fstat", file);
 			(void)close(fd);
@@ -246,7 +246,7 @@ cnt(const char *file)
 		if (siginfo)
 			show_cnt(file, linect, wordct, charct, llct);
 		charct += len;
-		if (doline) {
+		if (doline || dolongline) {
 			for (p = buf; len--; ++p)
 				if (*p == '\n') {
 					if (tmpll > llct)
@@ -262,10 +262,8 @@ cnt(const char *file)
 		tlinect += linect;
 	if (dochar)
 		tcharct += charct;
-	if (dolongline) {
-		if (llct > tlongline)
-			tlongline = llct;
-	}
+	if (dolongline && llct > tlongline)
+		tlongline = llct;
 	show_cnt(file, linect, wordct, charct, llct);
 	(void)close(fd);
 	return (0);
@@ -331,10 +329,8 @@ word:	gotsp = 1;
 		twordct += wordct;
 	if (dochar || domulti)
 		tcharct += charct;
-	if (dolongline) {
-		if (llct > tlongline)
-			tlongline = llct;
-	}
+	if (dolongline && llct > tlongline)
+		tlongline = llct;
 	show_cnt(file, linect, wordct, charct, llct);
 	(void)close(fd);
 	return (0);