srogue: add and use more md_* portable functions.

Privileges and memory usage checks are now more portable.

srogue/main.c

@@ -29,8 +29,6 @@
 #endif
 
 #ifdef BSD
-#define srand48(seed)	srandom(seed)
-#define lrand48()	random()
 #include <sys/time.h>
 #endif
 
@@ -57,13 +55,8 @@ char **envp;
 	if (homedir == NULL)
         	homedir = "";
 
-	playuid = getuid();
-
-	if (setuid(playuid) < 0) {
-		printf("Cannot change to effective uid: %d\n", playuid);
-		exit(1);
-	}
-	playgid = getgid();
+	playuid = md_getuid();
+	playgid = md_getgid();
 
 	/* check for print-score option */
 #ifdef SCOREFILE
@@ -121,6 +114,9 @@ char **envp;
 	}
 #endif
 
+	if (!use_savedir)
+		md_droppriv();
+
 	/* get home and options from environment */
 
 	if ((env = getenv("HOME")) != NULL)
@@ -177,7 +173,7 @@ char **envp;
 
 	fflush(stdout);
 	seed = dnum;
-	srand48(seed);			/* init rnd number gen */
+	srandom(seed);			/* init rnd number gen */
 
 	md_onsignal_exit();		/* just in case */
 
@@ -358,7 +354,7 @@ int range;
 	if (range == 0)
 		wh = 0;
 	else {
-		wh = lrand48() % range;
+		wh = random() % range;
 		wh &= 0x7FFFFFFF;
 	}
 	return wh;