From 8a7a83179df28c24a15d2615863e31b43ad0a752 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@kth.se>
Date: Tue, 20 Feb 2018 21:25:11 +0100
Subject: Add -s
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Signed-off-by: Mattias Andrée <maandree@kth.se>
---
 README | 27 +++++++++++++++------------
 loc.1  | 31 ++++++++++++++-----------------
 loc.c  | 21 +++++++++++++++------
 3 files changed, 44 insertions(+), 35 deletions(-)

diff --git a/README b/README
index 24bc05c..5ac0881 100644
--- a/README
+++ b/README
@@ -2,25 +2,28 @@ NAME
 	loc - count number of lines of code
 
 SYNOPSIS
-	loc [file] ...
+	loc [-s] [file] ...
 
 DESCRIPTION
 	loc counts the number of lines of code for each specified
 	file. loc will treat each file as a C source code or C header
-	file. If file is -, the standard input is read.
-
-	If no file is specified, the standard input is read, and
-	the number of lines of code is output on the format
-
-		"%zu\n", <#lines of code>
-
-	If exactly one file is specified, its number of lines of
-	code is output on the format
-
-		"%zu\n", <#lines of code>
+	file. If file is -, or if a file is not specified, the
+	standard input is read.
 
 	If more than one file is specified, each successfully
 	line counted file will have its of lines of code output on
 	the format
 
 		"%s:%*s%zu\n", <file>, <some positive integer>, "", <#lines of code>
+
+	The total for all processed files, is printed on the last
+	line with the format
+
+		"%zu\n", <#total lines of code>
+
+	If exactly one or no files are specified, this will be the
+	only line output.
+
+OPTIONS
+	-s
+		Only output the last line. (The total over all files.)
diff --git a/loc.1 b/loc.1
index 8c87eeb..efbfd2e 100644
--- a/loc.1
+++ b/loc.1
@@ -13,30 +13,27 @@ will treat each file as a C source code or C header file. If
 .I file
 is
 .BR - ,
-the standard input is read.
+or if a file is not specified, the standard input is read.
 .PP
-If no
+If more than one
 .I file
-is specified, the standard input is read, and the number
-of lines of code is output on the format
+is specified, each successfully line counted file will have
+its of lines of code output on the format
 .nf
 
-	\fB"%zu\n"\fP, <\fI#lines of code\fP>
+	\fB"%s:%*s%zu\n"\fP, <\fIfile\fP>, <\fIsome positive integer\fP>, \fB""\fP, <\fI#lines of code\fP>
 .fi
 .PP
-If exactly one
-.I file
-is specified, its number of lines of code is output on the format
+The total for all processed files, is printed on the last
+line with the format
 .nf
 
-	\fB"%zu\n"\fP, <\fI#lines of code\fP>
+	\fB"%zu\n"\fP, <\fI#total lines of code\fP>
 .fi
 .PP
-If more than one
-.I file
-is specified, each successfully line counted file will have
-its of lines of code output on the format
-.nf
-
-	\fB"%s:%*s%zu\n"\fP, <\fIfile\fP>, <\fIsome positive integer\fP>, \fB""\fP, <\fI#lines of code\fP>
-.fi
+If exactly one or no files are specified, this will be the
+only line output.
+.SH OPTIONS
+.TP
+.B \-s
+Only output the last line. (The total over all files.)
diff --git a/loc.c b/loc.c
index 8c49152..dc47107 100644
--- a/loc.c
+++ b/loc.c
@@ -21,7 +21,7 @@ struct result {
 static void
 usage(void)
 {
-	fprintf(stderr, "usage: %s [file] ...\n", argv0);
+	fprintf(stderr, "usage: %s [-s] [file] ...\n", argv0);
 	exit(1);
 }
 
@@ -140,11 +140,15 @@ zuwidth(size_t num)
 int
 main(int argc, char *argv[])
 {
-	ssize_t n;
+	ssize_t n, total = 0;
 	struct result *res;
 	int i, fd, maxleft = 0, maxright = 0, maxwidth, left, right, ret = 0;
+	int sum_only = 0;
 
 	ARGBEGIN {
+	case 's':
+		sum_only = 1;
+		break;
 	default:
 		usage();
 	} ARGEND;
@@ -181,12 +185,17 @@ main(int argc, char *argv[])
 			}
 		}
 		maxwidth = maxleft + maxright;
-		for (i = 0; i < argc; i++)
-			if (res[i].n < 0)
+		for (i = 0; i < argc; i++) {
+			if (res[i].n < 0) {
 				ret = 1;
-			else
-				printf("%s:%*s %zi\n", argv[i], maxwidth - res[i].width, "", res[i].n);
+			} else {
+				if (!sum_only)
+					printf("%s:%*s %zi\n", argv[i], maxwidth - res[i].width, "", res[i].n);
+				total += res[i].n;
+			}
+		}
 		free(res);
+		printf("%zi\n", total);
 	}
 
         if (fflush(stdin) || ferror(stdin) || fclose(stdin))
-- 
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