Add option for setting log file

1 files changed, 13 insertions, 4 deletions

diff --git a/src/calculer.c b/src/calculer.c
index 5eefb87..0e442de 100644
--- a/src/calculer.c
+++ b/src/calculer.c
@@ -71,8 +71,10 @@ measure_after(void *data, int correct)
 }
 
 #define print_opt_noarg(opt, desc) \
-	fprintf(stream, "  -"opt"\t"desc"\n")
+	fprintf(stream, "  -"opt"\t\t"desc"\n")
 
+#define print_opt_arg(opt, arg, desc) \
+	fprintf(stream, "  -"opt" "arg"\t"desc"\n");
 
 void
 print_usage(FILE *stream)
@@ -81,6 +83,7 @@ print_usage(FILE *stream)
 	fprintf(stream, "OPTIONS\n");
 	print_opt_noarg("V", "Print version and exit.");
 	print_opt_noarg("h", "Print help and exit.");
+	print_opt_arg("l", "LOGFILE", "Use LOGFILE as log file.\n");
 }
 
 void
@@ -100,9 +103,9 @@ print_version(void)
 int
 main(int argc, char *argv[])
 {
+	char *logpath = "./calculer.log";
+
 	srand(time(NULL));
-	logfile = fopen("./calculer.log", "a");
-	assert(logfile);
 
 	time_t now = time(NULL);
 	struct tm *tm = localtime(&now);
@@ -110,7 +113,7 @@ main(int argc, char *argv[])
 	assert(bytes_written);
 
 	int opt;
-	while ((opt = getopt(argc, argv, ":Vh")) != -1)
+	while ((opt = getopt(argc, argv, ":Vhl:")) != -1)
 	{
 		switch (opt)
 		{
@@ -120,6 +123,9 @@ main(int argc, char *argv[])
 		case 'h':
 			print_help();
 			exit(0);
+		case 'l':
+			logpath = optarg;
+			break;
 		case ':':
 			fprintf(stderr,
 				"calculer: option %d requires an argument\n",
@@ -132,6 +138,9 @@ main(int argc, char *argv[])
 		}
 	}
 
+	logfile = fopen(logpath, "a");
+	assert(logfile);
+
 	while (1)
 	{
 		char prompt[32] = {0};