Retired/retval/retval.c

@@ -1,24 +0,0 @@
-#include <errno.h> /* errno */
-#include <stdio.h> /* fprintf(3), stderr */
-#include <stdlib.h> /* strtol(3) */
-#include <sysexits.h> /* EX_USAGE */
-
-char *program_name = "retval";
-
-int main(int argc, char *argv[]){
-
-	switch(argc){
-		case 2: {
-				unsigned int s;
-
-				errno = 0;
-				s = strtol(argv[1], &argv[1], 10);
-
-				if(*argv[1] == '\0' && errno == 0) { return s; }
-		} /* FALLTHROUGH */
-		default:
-			fprintf(stderr, "Usage: %s status\n",
-				argv[0] == NULL ? program_name : argv[0]);
-			return EX_USAGE;
-	}
-}

retval/retval.c

@@ -0,0 +1,24 @@
+#include <errno.h> /* errno */
+#include <stdio.h> /* fprintf(3), stderr */
+#include <stdlib.h> /* strtol(3) */
+#include <sysexits.h> /* EX_USAGE */
+
+int usage(char *s){
+	fprintf(stderr, "Usage: %s [status]\n", s == NULL ? "retval" : s);
+	return EX_USAGE;
+}
+
+int main(int argc, char *argv[]){
+
+	switch(argc){
+		case 2: { unsigned int s;
+			errno = 0;
+			s = strtol(argv[1], &argv[1], 10);
+			if(*argv[1] != '\0' || errno != 0){
+				return usage(argv[0]);
+			}
+			return s;
+		}
+		default: return usage(argv[0]);
+	}
+}

retval/retval.rs

@@ -1,7 +1,7 @@
 use std::{env::args, process::ExitCode};
 
 fn usage(s: &str) -> ExitCode {
-    eprintln!("Usage: {} status", s);
+    eprintln!("Usage: {} [status]", s);
     ExitCode::from(64 /* NetBSD sysexits(3) EX_USAGE */)
 }