Fix stdin bug

src/lib/arg.c

@@ -4,7 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#define LAT_USAGE "usage: lat [cnVh] [files..]"
+#define LAT_USAGE "usage: lat [-cnVh] [files..]"
 
 void help(void) {
   printf("%s\n", LAT_USAGE);
@@ -89,7 +89,7 @@ int parseargs(int argc, char *argv[]) {
   for (i = 1; i < argc; i++) { // offset for argv[0]
     char *arg = argv[i];
 
-    if (*arg == '-') {
+    if (arg[0] == '-' && arg[1] == '\0') {
       return i;
     }
 

src/main.c

@@ -71,7 +71,7 @@ void initconf(void) {
   conf.has_read_stdin = false;
 }
 
-void clearstdin() {
+void clearstdin(void) {
   // from
   // https://stackoverflow.com/questions/7898215/how-to-clear-input-buffer-in-c
   fseek(stdin, 0, SEEK_END);