Replaces unchecked strcpy/strcat with strlcpy/strlcat

Unchecked strcpy/strcat can result in memory smashes if provided with
overly long source arguments. Replacing these with the strl... functions
protects against overruns of the destination memory.

Requires changing the signature of various functions to pass destination
storage size when destination argument is a pointer rather than something
amenable to sizeof() operator.

Author: nbriggs

inc/dirdefs.h

@@ -58,7 +58,7 @@ typedef struct dfinfo {
 } DFINFO;
 
 #ifdef DOS
-int make_old_version(char *old, char *file);
+int make_old_version(char *old, size_t oldsize, char *file);
 #endif
 #ifdef FSDEBUG
 void print_finfo(FINFO *fp);

inc/dskdefs.h

@@ -21,7 +21,7 @@ LispPTR COM_changedir(LispPTR *args);
 LispPTR COM_getfreeblock(LispPTR *args);
 void conc_dir_and_name(char *dir, char *name, char *fname, size_t fname_size);
 void conc_name_and_version(char *name, char *ver, char *rname, size_t rname_size);
-void separate_version(char *name, char *ver, int checkp);
+void separate_version(char *name, size_t namesize, char *ver, size_t versize, int checkp);
 int unpack_filename(char *file, char *dir, char *name, char *ver, int checkp);
-int true_name(char *path);
+int true_name(char *path, size_t pathsize);
 #endif