Promote pg_dumpall shell/connstr quoting functions to src/fe_utils.

Rename these newly-extern functions with terms more typical of their new
neighbors.  No functional changes; a subsequent commit will use them in
more places.  Back-patch to 9.1 (all supported versions).  Back branches
lack src/fe_utils, so instead rename the functions in place; the
subsequent commit will copy them into the other programs using them.

Security: CVE-2016-5424

src/bin/pg_dump/pg_dumpall.c

@@ -49,8 +49,8 @@ static void makeAlterConfigCommand(PGconn *conn, const char *arrayitem,
 					   const char *name2);
 static void dumpDatabases(PGconn *conn);
 static void dumpTimestamp(const char *msg);
-static void doShellQuoting(PQExpBuffer buf, const char *str);
-static void doConnStrQuoting(PQExpBuffer buf, const char *str);
+static void appendShellString(PQExpBuffer buf, const char *str);
+static void appendConnStrVal(PQExpBuffer buf, const char *str);
 
 static int	runPgDump(const char *dbname);
 static void buildShSecLabels(PGconn *conn, const char *catalog_name,
@@ -214,7 +214,7 @@ main(int argc, char *argv[])
 			case 'f':
 				filename = pg_strdup(optarg);
 				appendPQExpBufferStr(pgdumpopts, " -f ");
-				doShellQuoting(pgdumpopts, filename);
+				appendShellString(pgdumpopts, filename);
 				break;
 
 			case 'g':
@@ -251,7 +251,7 @@ main(int argc, char *argv[])
 
 			case 'S':
 				appendPQExpBufferStr(pgdumpopts, " -S ");
-				doShellQuoting(pgdumpopts, optarg);
+				appendShellString(pgdumpopts, optarg);
 				break;
 
 			case 't':
@@ -287,13 +287,13 @@ main(int argc, char *argv[])
 
 			case 2:
 				appendPQExpBufferStr(pgdumpopts, " --lock-wait-timeout ");
-				doShellQuoting(pgdumpopts, optarg);
+				appendShellString(pgdumpopts, optarg);
 				break;
 
 			case 3:
 				use_role = pg_strdup(optarg);
 				appendPQExpBufferStr(pgdumpopts, " --role ");
-				doShellQuoting(pgdumpopts, use_role);
+				appendShellString(pgdumpopts, use_role);
 				break;
 
 			default:
@@ -1726,9 +1726,9 @@ runPgDump(const char *dbname)
 	 * string.
 	 */
 	appendPQExpBuffer(connstrbuf, "%s dbname=", connstr);
-	doConnStrQuoting(connstrbuf, dbname);
+	appendConnStrVal(connstrbuf, dbname);
 
-	doShellQuoting(cmd, connstrbuf->data);
+	appendShellString(cmd, connstrbuf->data);
 
 	if (verbose)
 		fprintf(stderr, _("%s: running \"%s\"\n"), progname, cmd->data);
@@ -2008,7 +2008,7 @@ constructConnStr(const char **keywords, const char **values)
 			appendPQExpBufferChar(buf, ' ');
 		firstkeyword = false;
 		appendPQExpBuffer(buf, "%s=", keywords[i]);
-		doConnStrQuoting(buf, values[i]);
+		appendConnStrVal(buf, values[i]);
 	}
 
 	connstr = pg_strdup(buf->data);
@@ -2089,7 +2089,7 @@ dumpTimestamp(const char *msg)
  * string
  */
 static void
-doConnStrQuoting(PQExpBuffer buf, const char *str)
+appendConnStrVal(PQExpBuffer buf, const char *str)
 {
 	const char *s;
 	bool		needquotes;
@@ -2138,7 +2138,7 @@ doConnStrQuoting(PQExpBuffer buf, const char *str)
  * there eventually leads to errors here.
  */
 static void
-doShellQuoting(PQExpBuffer buf, const char *str)
+appendShellString(PQExpBuffer buf, const char *str)
 {
 	const char *p;