diff --git a/include/file.h b/include/file.h
index da7be336..6df41257 100644
--- a/include/file.h
+++ b/include/file.h
@@ -58,9 +58,9 @@ struct empfile {
     int fd;			/* file descriptor, -1 if not open */
     /* and flags bit EFF_RDONLY */
     /* User callbacks */
-    void (*init)(int, char *);	/* called after entry creation, unless null */
-    int (*postread)(int, char *); /* called after read, unless null */
-    int (*prewrite)(int, char *); /* called before write, unless null */
+    void (*init)(int, void *);	/* called after entry creation, unless null */
+    int (*postread)(int, void *); /* called after read, unless null */
+    int (*prewrite)(int, void *); /* called before write, unless null */
 };
 
 /*
diff --git a/include/prototypes.h b/include/prototypes.h
index d6bfd3c3..31aec208 100644
--- a/include/prototypes.h
+++ b/include/prototypes.h
@@ -494,9 +494,9 @@ extern void bitinit2(struct nstr_sect *, u_char *, int);
 extern int getele(char *, char *);
 /* land.c */
 extern s_char *prland(struct lndstr *);
-extern int lnd_postread(int, s_char *);
-extern int lnd_prewrite(int, s_char *);
-extern void lnd_init(int, s_char *);
+extern int lnd_postread(int, void *);
+extern int lnd_prewrite(int, void *);
+extern void lnd_init(int, void *);
 /* landgun.c */
 extern double seagun(int, int);
 extern double landgun(int, int);
@@ -553,9 +553,9 @@ extern void delete_old_news(void);
 extern void init_nreport(void);
 extern void nreport(natid, int, natid, int);
 /* nuke.c */
-extern int nuk_postread(int, s_char *);
-extern int nuk_prewrite(int, s_char *);
-extern void nuk_init(int, s_char *);
+extern int nuk_postread(int, void *);
+extern int nuk_prewrite(int, void *);
+extern void nuk_init(int, void *);
 extern void nuk_add(coord, coord, int, int);
 extern void nuk_delete(struct nukstr *, int, int);
 /* nxtitem.c */
@@ -564,9 +564,9 @@ extern int nxtitem(struct nstr_item *, void *);
 extern int nxtsct(struct nstr_sect *, struct sctstr *);
 /* plane.c */
 extern s_char *prplane(struct plnstr *);
-extern int pln_postread(int, s_char *);
-extern int pln_prewrite(int, s_char *);
-extern void pln_init(int, s_char *);
+extern int pln_postread(int, void *);
+extern int pln_prewrite(int, void *);
+extern void pln_init(int, void *);
 /* plnsub.c */
 extern void count_planes(struct shpstr *);
 extern struct sctstr *get_assembly_point(char *, struct sctstr *, char *);
@@ -653,15 +653,15 @@ extern void satdisp(struct sctstr *, int, int);
 extern void satmap(int, int, int, int, int, int);
 extern void sathead(void);
 /* sect.c */
-extern int sct_postread(int, s_char *);
-extern int sct_prewrite(int, s_char *);
+extern int sct_postread(int, void *);
+extern int sct_prewrite(int, void *);
 extern void item_prewrite(short *);
 extern int issector(s_char *);
 /* ship.c */
 extern s_char *prship(struct shpstr *);
-extern int shp_postread(int, s_char *);
-extern int shp_prewrite(int, s_char *);
-extern void shp_init(int, s_char *);
+extern int shp_postread(int, void *);
+extern int shp_prewrite(int, void *);
+extern void shp_init(int, void *);
 /* show.c */
 extern void show_bridge(int);
 extern void show_tower(int);
diff --git a/src/lib/common/file.c b/src/lib/common/file.c
index 46ae9e30..3a660939 100644
--- a/src/lib/common/file.c
+++ b/src/lib/common/file.c
@@ -379,7 +379,7 @@ int
 ef_extend(int type, int count)
 {
     struct empfile *ep;
-    char *tmpobj;
+    void *tmpobj;
     int id, i, how;
 
     if (ef_check(type) < 0)
diff --git a/src/lib/subs/fileinit.c b/src/lib/subs/fileinit.c
index bf213f97..baa6ac9d 100644
--- a/src/lib/subs/fileinit.c
+++ b/src/lib/subs/fileinit.c
@@ -39,9 +39,9 @@
 
 struct fileinit {
     int ef_type;
-    void (*init) (int, char *);
-    int (*postread) (int, char *);
-    int (*prewrite) (int, char *);
+    void (*init) (int, void *);
+    int (*postread) (int, void *);
+    int (*prewrite) (int, void *);
 };
 
 static struct fileinit fileinit[] = {
diff --git a/src/lib/subs/land.c b/src/lib/subs/land.c
index 5bbaeb88..34813b5d 100644
--- a/src/lib/subs/land.c
+++ b/src/lib/subs/land.c
@@ -44,9 +44,9 @@
 #include "optlist.h"
 
 int
-lnd_postread(int n, s_char *ptr)
+lnd_postread(int n, void *ptr)
 {
-    struct lndstr *llp = (struct lndstr *)ptr;
+    struct lndstr *llp = ptr;
     struct shpstr theship;
     struct lndstr theland;
 
@@ -108,11 +108,10 @@ lnd_postread(int n, s_char *ptr)
     return 1;
 }
 
-/*ARGSUSED*/
 int
-lnd_prewrite(int n, s_char *ptr)
+lnd_prewrite(int n, void *ptr)
 {
-    struct lndstr *llp = (struct lndstr *)ptr;
+    struct lndstr *llp = ptr;
     struct lndstr land;
     struct lndstr *lp;
     struct plnstr *pp;
@@ -163,9 +162,9 @@ lnd_prewrite(int n, s_char *ptr)
 }
 
 void
-lnd_init(int n, s_char *ptr)
+lnd_init(int n, void *ptr)
 {
-    struct lndstr *lp = (struct lndstr *)ptr;
+    struct lndstr *lp = ptr;
 
     lp->ef_type = EF_LAND;
     lp->lnd_uid = n;
diff --git a/src/lib/subs/nuke.c b/src/lib/subs/nuke.c
index cf8c0a97..969e36fe 100644
--- a/src/lib/subs/nuke.c
+++ b/src/lib/subs/nuke.c
@@ -44,11 +44,10 @@
 #include "nat.h"
 #include "prototypes.h"
 
-/*ARGSUSED*/
 int
-nuk_postread(int n, s_char *ptr)
+nuk_postread(int n, void *ptr)
 {
-    struct nukstr *np = (struct nukstr *)ptr;
+    struct nukstr *np = ptr;
 
     if (np->nuk_uid != n) {
 	logerror("nuk_postread: Error - %d != %d, zeroing.\n", np->nuk_uid,
@@ -59,11 +58,10 @@ nuk_postread(int n, s_char *ptr)
     return 1;
 }
 
-/*ARGSUSED*/
 int
-nuk_prewrite(int n, s_char *ptr)
+nuk_prewrite(int n, void *ptr)
 {
-    struct nukstr *np = (struct nukstr *)ptr;
+    struct nukstr *np = ptr;
     struct nukstr nuke;
 
     np->ef_type = EF_NUKE;
@@ -77,9 +75,9 @@ nuk_prewrite(int n, s_char *ptr)
 }
 
 void
-nuk_init(int n, s_char *ptr)
+nuk_init(int n, void *ptr)
 {
-    struct nukstr *np = (struct nukstr *)ptr;
+    struct nukstr *np = ptr;
 
     np->ef_type = EF_NUKE;
     np->nuk_uid = n;
diff --git a/src/lib/subs/plane.c b/src/lib/subs/plane.c
index e12b0f31..c57dae4d 100644
--- a/src/lib/subs/plane.c
+++ b/src/lib/subs/plane.c
@@ -44,9 +44,9 @@
 #include "optlist.h"
 
 int
-pln_postread(int n, s_char *ptr)
+pln_postread(int n, void *ptr)
 {
-    struct plnstr *pp = (struct plnstr *)ptr;
+    struct plnstr *pp = ptr;
     struct shpstr theship;
     struct lndstr theland;
 
@@ -106,11 +106,10 @@ pln_postread(int n, s_char *ptr)
     return 1;
 }
 
-/*ARGSUSED*/
 int
-pln_prewrite(int n, s_char *ptr)
+pln_prewrite(int n, void *ptr)
 {
-    struct plnstr *pp = (struct plnstr *)ptr;
+    struct plnstr *pp = ptr;
     struct plnstr plane;
 
     if (pp->pln_effic < PLANE_MINEFF) {
@@ -131,9 +130,9 @@ pln_prewrite(int n, s_char *ptr)
 }
 
 void
-pln_init(int n, s_char *ptr)
+pln_init(int n, void *ptr)
 {
-    struct plnstr *pp = (struct plnstr *)ptr;
+    struct plnstr *pp = ptr;
 
     pp->ef_type = EF_PLANE;
     pp->pln_uid = n;
diff --git a/src/lib/subs/sect.c b/src/lib/subs/sect.c
index 16a56a0a..59934a45 100644
--- a/src/lib/subs/sect.c
+++ b/src/lib/subs/sect.c
@@ -48,11 +48,10 @@
 
 static int checksect(struct sctstr *);
 
-/*ARGSUSED*/
 int
-sct_postread(int id, s_char *ptr)
+sct_postread(int id, void *ptr)
 {
-    struct sctstr *sp = (struct sctstr *)ptr;
+    struct sctstr *sp = ptr;
 
     checksect(sp);
     player->owner = (player->god || sp->sct_own == player->cnum);
@@ -61,11 +60,10 @@ sct_postread(int id, s_char *ptr)
     return 1;
 }
 
-/*ARGSUSED*/
 int
-sct_prewrite(int id, s_char *ptr)
+sct_prewrite(int id, void *ptr)
 {
-    struct sctstr *sp = (struct sctstr *)ptr;
+    struct sctstr *sp = ptr;
     struct sctstr sect;
 
     time(&sp->sct_timestamp);
diff --git a/src/lib/subs/ship.c b/src/lib/subs/ship.c
index 29019dc3..602323dd 100644
--- a/src/lib/subs/ship.c
+++ b/src/lib/subs/ship.c
@@ -44,11 +44,10 @@
 #include "prototypes.h"
 #include "optlist.h"
 
-/*ARGSUSED*/
 int
-shp_postread(int n, s_char *ptr)
+shp_postread(int n, void *ptr)
 {
-    struct shpstr *sp = (struct shpstr *)ptr;
+    struct shpstr *sp = ptr;
 
     if (sp->shp_uid != n) {
 	logerror("shp_postread: Error - %d != %d, zeroing.\n", sp->shp_uid,
@@ -63,9 +62,9 @@ shp_postread(int n, s_char *ptr)
 }
 
 int
-shp_prewrite(int n, s_char *ptr)
+shp_prewrite(int n, void *ptr)
 {
-    struct shpstr *sp = (struct shpstr *)ptr;
+    struct shpstr *sp = ptr;
     struct shpstr ship;
     struct lndstr *lp;
     struct plnstr *pp;
@@ -116,9 +115,9 @@ shp_prewrite(int n, s_char *ptr)
 }
 
 void
-shp_init(int n, s_char *ptr)
+shp_init(int n, void *ptr)
 {
-    struct shpstr *sp = (struct shpstr *)ptr;
+    struct shpstr *sp = ptr;
 
     sp->ef_type = EF_SHIP;
     sp->shp_uid = n;