some coordxy and other conversion warnings

When dist2() got changed to use coordxy parameters, a macro that uses
it in its definition was overlooked and it had (int) casts in it.
That caused a warning about possible data loss when the int
then got converted to coordxy for the dist2() call.

Give online2() coordxy parameters instead of int, like its bretheren.

Avoid a couple of implicit conversion warnings where ints were being assigned
to smaller uchar or ints being assigned to smaller short.

A couple of signed vs unsigned warnings on some rumor processing.

Avoid some signed vs unsigned warnings in mdlib/makedefs where a signed int
param eventually got used in an external call that took size_t.
Eliminate all of it by just having the outer NetHack routine also take
a size_t.

Lastly, insert some default C99 alternative time-related code
in mdlib/makedefs since asctime() and ctime() are being flagged as
deprecated in the upcoming C23 standard and will now start to trigger
warnings for anyone using a C23-compliant compiler.

include/extern.h

@@ -1028,7 +1028,7 @@ extern int rounddiv(long, int);
 extern int dist2(coordxy, coordxy, coordxy, coordxy);
 extern int isqrt(int);
 extern int distmin(coordxy, coordxy, coordxy, coordxy);
-extern boolean online2(int, int, int, int);
+extern boolean online2(coordxy, coordxy, coordxy, coordxy);
 extern boolean pmatch(const char *, const char *);
 extern boolean pmatchi(const char *, const char *);
 extern boolean pmatchz(const char *, const char *);

include/hack.h

@@ -709,9 +709,9 @@ enum optset_restrictions {
      - min((int) greatest_erosion(obj), objects[(obj)->otyp].a_ac))
 
 #define makeknown(x) discover_object((x), TRUE, TRUE)
-#define distu(xx, yy) dist2((int) (xx), (int) (yy), (int) u.ux, (int) u.uy)
+#define distu(xx, yy) dist2((coordxy) (xx), (coordxy) (yy), (coordxy) u.ux, (coordxy) u.uy)
 #define mdistu(mon) distu((mon)->mx, (mon)->my)
-#define onlineu(xx, yy) online2((int)(xx), (int)(yy), (int) u.ux, (int) u.uy)
+#define onlineu(xx, yy) online2((coordxy)(xx), (coordxy)(yy), (coordxy) u.ux, (coordxy) u.uy)
 
 #define rn1(x, y) (rn2(x) + (y))
 

src/hacklib.c

@@ -721,7 +721,7 @@ isqrt(int val)
 
 /* are two points lined up (on a straight line)? */
 boolean
-online2(int x0, int y0, int x1, int y1)
+online2(coordxy x0, coordxy y0, coordxy x1, coordxy y1)
 {
     int dx = x0 - x1, dy = y0 - y1;
     /*  If either delta is zero then they're on an orthogonal line,

src/mdlib.c

@@ -55,8 +55,8 @@ static boolean date_via_env = FALSE;
 
 extern unsigned long md_ignored_features(void);
 char *mdlib_version_string(char *, const char *);
-char *version_id_string(char *, int, const char *);
+char *version_id_string(char *, size_t, const char *);
-char *bannerc_string(char *, int, const char *);
+char *bannerc_string(char *, size_t, const char *);
 int case_insensitive_comp(const char *, const char *);
 
 static void make_version(void);
@@ -300,7 +300,7 @@ RESTORE_WARNING_FORMAT_NONLITERAL
 #endif  /* MAKEDEFS_C */
 
 char *
-version_id_string(char *outbuf, int bufsz, const char *build_date)
+version_id_string(char *outbuf, size_t bufsz, const char *build_date)
 {
     char subbuf[64], versbuf[64];
     char statusbuf[64];
@@ -333,7 +333,7 @@ version_id_string(char *outbuf, int bufsz, const char *build_date)
 /* still within #if MAKDEFS_C || FOR_RUNTIME */
 
 char *
-bannerc_string(char *outbuf, int bufsz, const char *build_date)
+bannerc_string(char *outbuf, size_t bufsz, const char *build_date)
 {
     char subbuf[64], versbuf[64];
 
@@ -814,10 +814,10 @@ case_insensitive_comp(const char *s1, const char *s2)
     for (;; s1++, s2++) {
         u1 = (uchar) *s1;
         if (isupper(u1))
-            u1 = tolower(u1);
+            u1 = (uchar) tolower(u1);
         u2 = (uchar) *s2;
         if (isupper(u2))
-            u2 = tolower(u2);
+            u2 = (uchar) tolower(u2);
         if (u1 == '\0' || u1 != u2)
             break;
     }

sys/msdos/tile2bin.c

@@ -190,7 +190,12 @@ main(int argc, char *argv[])
 #endif
 
     strncpy(tibheader.ident, "NetHack 3.7 MSDOS Port binary tile file", 80);
+#if !defined(NOSTRFTIME)
+    if (!strftime(tibheader.timestamp,
+                  sizeof tibheader.timestamp, "%c", newtime))
+#else
     strncpy(tibheader.timestamp, asctime(newtime), 24);
+#endif
     tibheader.timestamp[25] = '\0';
     tibheader.tilecount = tilecount;
     tibheader.numcolors = num_colors;

util/makedefs.c

@@ -1077,11 +1077,11 @@ do_rumors(void)
             true_rumor_size, true_rumor_offset, false_rumor_count,
             false_rumor_size, false_rumor_offset, eof_offset);
     /* record the current position; true rumors will start here */
-    true_rumor_offset = ftell(tfp);
+    true_rumor_offset = (unsigned long) ftell(tfp);
 
-    false_rumor_offset = read_rumors_file(".tru", &true_rumor_count,
+    false_rumor_offset = (unsigned long) read_rumors_file(".tru", &true_rumor_count,
-                                          &true_rumor_size, true_rumor_offset,
+                                             &true_rumor_size, true_rumor_offset,
-                                          MD_PAD_RUMORS);
+                                             MD_PAD_RUMORS);
     if (!false_rumor_offset)
         goto rumors_failure;
 
@@ -1241,11 +1241,21 @@ do_date(void)
                     (unsigned long) clocktim);
             (void) fflush(stderr);
         }
+#if !defined(NOSTRFTIME)
+        if (!strftime(cbuf, sizeof cbuf, "%c", gmtime(&clocktim)))
+            cbuf[0] = '\0';
+#else
         Strcpy(cbuf, asctime(gmtime(&clocktim)));
+#endif  /* NOSTRFTIME */
     }
 #else
     /* ordinary build: use current date+time */
+#if !defined(NOSTRFTIME)
+    if (!strftime(cbuf, sizeof cbuf, "%c", localtime(&clocktim)))
+        cbuf[0] = '\0';
+#else
     Strcpy(cbuf, ctime(&clocktim));
+#endif /* NOSTRFTIME */
 #endif /* REPRODUCIBLE_BUILD */
 
     if ((c = strchr(cbuf, '\n')) != 0)
@@ -1979,7 +1989,7 @@ do_objs(void)
     for (i = 0; !i || objects[i].oc_class != ILLOBJ_CLASS; i++) {
         SpinCursor(3);
 
-        objects[i].oc_name_idx = objects[i].oc_descr_idx = i; /* init */
+        objects[i].oc_name_idx = objects[i].oc_descr_idx = (short) i;
         if (!(objnam = tmpdup(OBJ_NAME(objects[i]))))
             continue;