Add version and copyright information

When run in flag "-v" or "--version", print version and copyright
information.

1 files changed, 20 insertions, 0 deletions

diff --git a/server.c b/server.c
index 109e4a4..0c8fa56 100644
--- a/server.c
+++ b/server.c
@@ -12,6 +12,11 @@
 #include <sys/sendfile.h>
 #include <unistd.h>
 
+#define PROGRAM_NAME "shsd"
+#define VERSION "0.0.1"
+#define COPYRIGHT_YEAR "2026"
+#define AUTHOR "Verdant <im@verdant.ee>"
+
 typedef enum { GET = 0, POST = 1, UNKNOWN = -1 } HTTP_METHODS;
 
 static void usage(const char *progname)
@@ -20,6 +25,15 @@ static void usage(const char *progname)
 	exit(EXIT_FAILURE);
 }
 
+static void version()
+{
+	printf("%s %s\n", PROGRAM_NAME, VERSION);
+	printf("Copyright (C) %s %s\n", COPYRIGHT_YEAR, AUTHOR);
+	printf("License GPLv3+: GNU GPL version 3 or later <https://www.gnu.org/licenses/gpl-3.0.html>.\n");
+	printf("This is free software: you are free to change and redistribute it.\n");
+	printf("There is NO WARRANTY, to the extent permitted by law.\n");
+}
+
 static int shsd_sendfile(int in_fd, FILE *ou_fd)
 {
 	struct stat s;
@@ -99,7 +113,13 @@ int main(int argc, char **argv)
 {
 	if (argc < 2) {
 		usage(argv[0]);
+		exit(1);
+	} else if (strcmp(argv[1], "-v") == 0 ||
+		   strcmp(argv[1], "--version") == 0) {
+		version();
+		exit(0);
 	}
+
 	struct addrinfo hints, *res;
 	struct sockaddr_storage their_addr;
 	socklen_t addr_size;