Add error check on getenv("DATADIR")

Add code to set DATADIR in postmaster.c if -D is used

src/backend/libpq/crypt.c

@@ -25,9 +25,13 @@ char* crypt_getpwdfilename() {
   static char*     filename = NULL;
 
   if (!filename) {
-    char*     env;
+    char*     env = NULL;
 
     env = getenv("PGDATA");
+    if(env == NULL) {
+      elog(FATAL, "crypt.c: PGDATA is not defined");
+      exit(-1);
+    }
     filename = (char*)malloc(strlen(env) + strlen(CRYPT_PWD_FILE) + 2);
     sprintf(filename, "%s/%s", env, CRYPT_PWD_FILE);
   }

src/backend/postmaster/postmaster.c

@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.63 1997/12/04 00:27:17 scrappy Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.64 1997/12/07 20:57:45 scrappy Exp $
  *
  * NOTES
  *
@@ -332,6 +332,11 @@ PostmasterMain(int argc, char *argv[])
 			case 'D':
 				/* Set PGDATA from the command line. */
 				DataDir = optarg;
+				{
+					char envEntry[2 * ARGV_SIZE];
+					sprintf(envEntry, "PGDATA=%s", DataDir);
+					putenv(envEntry);
+				}
 				break;
 			case 'd':