From de4112baf9b1bcfa3c6ee06cbf78f95f1a213b46 Mon Sep 17 00:00:00 2001
From: Jan Sucan <jan@jansucan.com>
Date: Sat, 1 May 2021 10:28:01 +0200
Subject: Specify program name and version in the Makefile

---
 Makefile | 11 +++++++++--
 main.c   |  9 +++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 03205f0..ff57fd7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,6 @@
+PROGRAM_NAME=diff-dd
+PROGRAM_VERSION=1.0
+
 CC=gcc
 CFLAGS=-Wall
 EXEC_NAME=diff-dd
@@ -5,10 +8,14 @@ EXEC_NAME=diff-dd
 SOURCES=*.c
 HEADERS=*.h
 
-all: $(SOURCES) $(HEADERS)
+all: $(SOURCES) $(HEADERS) program_info_header
 	$(CC) $(CFLAGS) -o $(EXEC_NAME) $(SOURCES)
 
+program_info_header:
+	echo "#define PROGRAM_NAME_STR \"$(PROGRAM_NAME)\"" >program_info.h
+	echo "#define PROGRAM_VERSION_STR \"$(PROGRAM_VERSION)\"" >>program_info.h
+
 .PHONY: clean
 
 clean:
-	rm -f *.o *~ $(EXEC_NAME)
+	rm -f *.o *~ $(EXEC_NAME) program_info.h
diff --git a/main.c b/main.c
index 6968710..ea94921 100644
--- a/main.c
+++ b/main.c
@@ -11,11 +11,16 @@
 #include "print.h"
 #include "resources.h"
 
+/* This header file is automatically generated at build time from the Makefile
+ */
+#include "program_info.h"
+
 void
 usage(int exit_code)
 {
-    printf("Usage: diff-dd [-s SECTOR_SIZE] [-b BUFFER_SIZE] [INFILE]  REFFILE "
-           " OUTFILE\n");
+    printf("Usage: %s [-s SECTOR_SIZE] [-b BUFFER_SIZE] [INFILE] REFFILE "
+           "OUTFILE\n",
+           PROGRAM_NAME_STR);
     exit(exit_code);
 }
 
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