https://bugs.gentoo.org/874390

Fix -Wimplicit-function-declaration and -Wformat-security.
--- a/NFBTRANS.C
+++ b/NFBTRANS.C
@@ -8,10 +8,12 @@
 #else
 #define UNIX_PATH "/etc/nfbtrans/"
 #endif             /* unix */
-#include	<stdio.h>
+#include <ctype.h>
+#include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <stdlib.h>
+#include <unistd.h>
 #ifdef DOS
 #include <io.h>
 #include <string.h>
@@ -132,6 +134,12 @@ char *output_extension[2] = {".brf", ".txt"};
 int paramcount;
 char **paramstr;
 
+void strnset(char *string, char c, short n);
+int strcmpi(char *s1, char *s2);
+void unbuf_stdin();
+void restore_stdin();
+void save_stdin();
+
 typedef struct
 {
   char *name;
@@ -5130,7 +5138,7 @@ void insert_hyphen_word(int date_only)
     field[l - 1] = 0;   /* remove lf */
     if (!lines)
     {              /* first line */
-      fprintf(tempfile, date_string);
+      fprintf(tempfile, "%s", date_string);
       cptr = strchr(field, 'A');
       if (cptr)
         strcpy(field, cptr);    /* get rid of date */
@@ -5341,7 +5349,7 @@ void test_hyphen_dictionary(int mode)
     /* open for r+ */
     open_hyp_dictionary(hyphen_dic_name, 3, 1);
     rewind(hyp_dic_ptr);
-    fprintf(hyp_dic_ptr, date_string);
+    fprintf(hyp_dic_ptr, "%s", date_string);
     open_hyp_dictionary(hyphen_dic_name, 3, 2);
   }                /* date found on first line */
   else
@@ -6511,7 +6519,7 @@ void translate_file()
       {            /* no file args */
         if (!indirect_ptr)
         {
-          fprintf(stderr, menu[10]);
+          fprintf(stderr, "%s", menu[10]);
           get_input(temp, 80);
           if (!temp[0])
             exit_program(0);
@@ -6709,9 +6717,9 @@ void translate_file()
     if (!trans_mode1)
     {              /* get secondary translation mode */
       i = (trans_default / 10);
-      fprintf(stderr, menu[0]);
+      fprintf(stderr, "%s", menu[0]);
       for (j = 5; j < 8; j++)
-        fprintf(stderr, menu[j]);
+        fprintf(stderr, "%s", menu[j]);
       backspace_int(i);
       do
       {
@@ -6744,7 +6752,7 @@ void translate_file()
         }          /* construct output name */
         else
         {          /* prompt */
-          fprintf(stderr, menu[11]);
+          fprintf(stderr, "%s", menu[11]);
           get_input(outf_name, MAXPATHLEN - 1);
         }          /* prompt */
         if (!outf_name[0])
@@ -7110,7 +7118,7 @@ void get_page_range()
   if (pageend < pagestart)
   {                /* pageend */
     pageend = 9999;
-    fprintf(stderr, menu[9]);
+    fprintf(stderr, "%s", menu[9]);
     backspace_int(pageend);
     get_input(temp, 5);
     get_end_page(temp);
@@ -7481,7 +7489,7 @@ int main(int argc, char *argv[])
   {                /* choose mode */
     j = (trans_default % 10);
     for (i = 0; i < 4; i++)
-      fprintf(stderr, menu[i]);
+      fprintf(stderr, "%s", menu[i]);
     while (trans_mode < 1 || trans_mode > 3)
     {
       fprintf(stderr, "\n%s", menu[4]);