Call can_user_post() rather than manual checks

Eliminate some redundant code. Use the userdat lib function provided for this purpose.

src/sbbs3/readmsgs.cpp

@@ -1596,8 +1596,7 @@ int sbbs_t::scanposts(uint subnum, long mode, const char *find)
 		free(post);
 	if(!quit
 		&& !(org_mode&(SCAN_CONST|SCAN_TOYOU|SCAN_FIND|SCAN_POLLS)) && !(cfg.sub[subnum]->misc&SUB_PONLY)
-		&& reads && chk_ar(cfg.sub[subnum]->post_ar,&useron,&client) && text[Post][0]
-		&& !(useron.rest&FLAG('P'))) {
+		&& reads && can_user_post(&cfg, subnum, &useron, &client, /* reason: */NULL) && text[Post][0]) {
 		SAFEPRINTF2(str,text[Post],cfg.grp[cfg.sub[subnum]->grp]->sname
 			,cfg.sub[subnum]->lname);
 		if(!noyes(str))

src/sbbs3/un_rep.cpp

@@ -409,28 +409,11 @@ bool sbbs_t::unpack_rep(char* repfile)
 				continue; 
 			}
 
-			if(useron.rest&FLAG('P')) {
-				bputs(text[R_Post]);
-				logline(LOG_NOTICE,"P!","QWK Post attempted");
-				continue; 
-			}
-
-			if(useron.ptoday>=cfg.level_postsperday[useron.level]
-				&& !(useron.rest&FLAG('Q'))) {
-				bputs(text[TooManyPostsToday]);
-				continue; 
-			}
-
-			if(useron.rest&FLAG('N')
-				&& cfg.sub[n]->misc&(SUB_FIDO|SUB_PNET|SUB_QNET|SUB_INET)) {
-				bputs(text[CantPostOnSub]);
-				logline(LOG_NOTICE,"P!","QWK Networked post attempted");
-				continue; 
-			}
-
-			if(!chk_ar(cfg.sub[n]->post_ar,&useron,&client)) {
-				bputs(text[CantPostOnSub]);
-				logline(LOG_NOTICE,"P!","QWK Post attempted");
+			uint reason = CantPostOnSub;
+			if(!can_user_post(&cfg, n, &useron, &client, &reason)) {
+				bputs(text[reason]);
+				SAFEPRINTF2(str, "QWK Post not allowed, reason = %u (%s)", reason, text[reason]);
+				logline(LOG_NOTICE, "P!", str);
 				continue; 
 			}