grobian@gentoo.org

auto-flush on stdio is really a glibc feature AFAICT, so in order for
musl to get prompts (and make the tool more bearable) just flush right
after writing half a line

--- mac-fdisk-0.1.orig/io.c	2022-06-01 19:37:08.000000000 +0200
+++ mac-fdisk-0.1.orig/io.c	2022-06-01 20:32:12.000000000 +0200
@@ -151,7 +151,8 @@
     int		c;
 
     flush_to_newline(0);
-    printf(prompt);
+    printf("%s", prompt);
+    fflush(NULL);
 
     for (;;) {
 	c = getch();
@@ -169,7 +170,8 @@
 	    return 0;
 	} else {
 	    flush_to_newline(0);
-	    printf(prompt);
+	    printf("%s", prompt);
+	    fflush(NULL);
 	}
     }
     return -1;
@@ -182,7 +184,8 @@
     int		c;
 
     if (promptBeforeGet) {
-	printf(prompt);
+	printf("%s", prompt);
+	fflush(NULL);
     }	
     for (;;) {
 	c = getch();
@@ -192,7 +195,8 @@
 	} else if (c == ' ' || c == '\t') {
 	    // skip blanks and tabs
 	} else if (c == '\n') {
-	    printf(prompt);
+	    printf("%s", prompt);
+	    fflush(NULL);
 	} else {
 	    *command = c;
 	    return 1;
@@ -217,7 +220,8 @@
 	    // skip blanks and tabs
 	} else if (c == '\n') {
 	    if (default_value < 0) {
-		printf(prompt);
+		printf("%s", prompt);
+		fflush(NULL);
 	    } else {
 		ungetch(c);
 		*number = default_value;
@@ -295,7 +307,8 @@
 	    // skip blanks and tabs
 	} else if (c == '\n') {
 	    if (reprompt) {
-		printf(prompt);
+		printf("%s", prompt);
+		fflush(NULL);
 	    } else {
 		ungetch(c);
 		*string = NULL;