doesn't flush by default, so the prompt is never printed

https://gitlab.alpinelinux.org/alpine/aports/-/blob/3.21-stable/main/tftp-hpa/fix-prompt-flush.patch

tftp/main.c

@@ -806,6 +806,7 @@ static void command(void)
             exit(0);            /* EOF */
 #else
         fputs(prompt, stdout);
+        fflush(stdout);
         if (fgets(line, LBUFLEN, stdin) == 0) {
             if (feof(stdin)) {
                 exit(0);

tftp/tftp.c

@@ -278,15 +278,16 @@ makerequest(int request, const char *name,
             struct tftphdr *tp, const char *mode)
 {
     char *cp;
+    size_t len;
 
     tp->th_opcode = htons((u_short) request);
     cp = (char *)&(tp->th_stuff);
-    strcpy(cp, name);
+    len = strlen(name) + 1;
-    cp += strlen(name);
+    memcpy(cp, name, len);
-    *cp++ = '\0';
+    cp += len;
-    strcpy(cp, mode);
+    len = strlen(mode) + 1;
-    cp += strlen(mode);
+    memcpy(cp, mode, len);
-    *cp++ = '\0';
+    cp += len;
     return (cp - (char *)tp);
 }