fixed

scripts/build-box.sh

@@ -2,6 +2,7 @@
 cat > mutils.c << EOF
 #include <stdio.h>
 #include <string.h>
+#include <libgen.h>
 
 $(for i in $(ls src); do
 	f=$(basename $i .c)
@@ -24,20 +25,28 @@ struct cmd {
 };
 
 int main(int argc, char **argv) {
-	if (argc > 1) {
-		argc--;
-		argv++;
+	char *prog = basename(argv[0]);
 
+	if (argc == 1 && !strcmp(prog, "mutils")) {
 		for (size_t i = 0; i < sizeof(cmds) / sizeof(struct cmd); i++)
-			if (!strcmp(argv[0], cmds[i].str))
-				return cmds[i].func(argc, argv);
+			printf("%s ", cmds[i].str);
+
+		putchar('\n');
+		return 0;
+	}
+
+	else if (!strcmp(prog, "mutils")) {
+		argv++;
+		argc--;
+
+		prog = argv[0];
 	}
 
 	for (size_t i = 0; i < sizeof(cmds) / sizeof(struct cmd); i++)
-		printf("%s ", cmds[i].str);
+		if (!strcmp(prog, cmds[i].str))
+			return cmds[i].func(argc, argv);
 
-	putchar('\n');
-	return 0;
+	fprintf(stderr, "mutils: unknown applet %s\n", prog);
 }
 EOF
 

scripts/musuid.c

@@ -3,23 +3,30 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
+#include <libgen.h>
 #define _MUSUID_C
 #include "config.h"
 
 const char *progs[] = {"su", "ping"};
 
 int main(int argc, char **argv) {
-	if (argc == 1) {
+	char *prog = basename(argv[0]);
+
+	if (argc == 1 && !strcmp(prog, "musuid")) {
 		fputs("musuid: missing operand\n", stderr);
 		return 1;
 	}
 
-	argc--;
-	argv++;
+	else if (!strcmp(prog, "musuid")) {
+		argv++;
+		argc--;
+
+		prog = argv[0];
+	}
 
 	/* RUN */
 	for (size_t i = 0; i < sizeof(progs) / sizeof(char *); i++)
-		if (!strcmp(argv[0], progs[i]))
+		if (!strcmp(prog, progs[i]))
 			execv(MUTILS_PATH, argv);
 
 	fprintf(stderr, "musuid: unknown command: %s\n", argv[0]);

src/su.c

@@ -60,23 +60,24 @@ static int password(const struct passwd *pw) {
 	fflush(stdout);
 
 	if (hide_input(STDIN_FILENO, 1)) {
-		fprintf(stderr, "su: %s\n", strerror(errno));
+		fprintf(stderr, "\nsu: %s\n", strerror(errno));
 		return 1;
 	}
 
 	off_t ret = 0;
 	if ((ret = read(STDIN_FILENO, psswd, sizeof(psswd))) <= 0) {
-		fprintf(stderr, "su: %s\n", strerror(errno));
+		fprintf(stderr, "\nsu: %s\n", strerror(errno));
 		return 1;
 	}
 
+	putchar('\n');
+
 	psswd[ret - 1] = '\0';
 	if (pw_check("su", pw, psswd)) {
 		memset(psswd, '\0', sizeof(psswd));
 		return 1;
 	}
 
-	printf("\n");
 	memset(psswd, '\0', sizeof(psswd));
 	return 0;
 }