Index: cmds.c
--- cmds.c.orig
+++ cmds.c
@@ -810,7 +810,7 @@ pullcells(int to_insert)
 
     if (to_insert == 'r') {
 	insertrow(numrows, 0);
-	if (fr = find_frange(currow, curcol))
+	if ((fr = find_frange(currow, curcol)))
 	    deltac = fr->or_left->col - mincol;
 	else {
 	    for (i = 0; i < numrows; i++)
@@ -2337,8 +2337,8 @@ copye(register struct enode *e, int Rdelta, int Cdelta
 		break;
 	    case 'f':
 	    case 'F':
-		if (range && ret->op == 'F' ||
-			!range && ret->op == 'f')
+		if ((range && ret->op == 'F') ||
+			(!range && ret->op == 'f'))
 		    Rdelta = Cdelta = 0;
 		ret->e.o.left = copye(e->e.o.left, Rdelta, Cdelta,
 			r1, c1, r2, c2, transpose);
@@ -2563,7 +2563,7 @@ openfile(char *fname, int *rpid, int *rfd)
 	    (void) dup(pipefd[3]);	/* connect to second pipe */
 	}
 	(void) signal(SIGINT, SIG_DFL);	/* reset */
-	(void) execl("/bin/sh", "sh", "-c", efname, 0);
+	(void) execl("/bin/sh", "sh", "-c", efname, NULL);
 	exit (-127);
     } else {				/* else parent */
 	*rpid = pid;
@@ -2861,12 +2861,12 @@ writefile(char *fname, int r0, int c0, int rn, int cn)
 	if ((plugin = findplugin(p+1, 'w')) != NULL) {
 	    if (!plugin_exists(plugin, strlen(plugin), save + 1)) {
 		error("plugin not found");
-		return;
+		return (-1);
 	    }
 	    *save = '|';
 	    if ((strlen(save) + strlen(fname) + 20) > PATHLEN) {
 		error("Path too long");
-		return;
+		return (-1);
 	    }
 	    sprintf(save + strlen(save), " %s%d:", coltoa(c0), r0);
 	    sprintf(save + strlen(save), "%s%d \"%s\"", coltoa(cn), rn, fname);
@@ -2883,13 +2883,14 @@ writefile(char *fname, int r0, int c0, int rn, int cn)
     }
 #endif /* VMS */
 
-    if (*fname == '\0')
+    if (*fname == '\0') {
 	if (isatty(STDOUT_FILENO) || *curfile != '\0')
 	    fname = curfile;
 	else {
 	    write_fd(stdout, r0, c0, rn, cn);
 	    return (0);
 	}
+    }
 
 #ifdef MSDOS
     namelen = 12;
@@ -2981,12 +2982,12 @@ readfile(char *fname, int eraseflg)
 	if ((plugin = findplugin(p+1, 'r')) != NULL) {
 	    if (!(plugin_exists(plugin, strlen(plugin), save + 1))) {
 		error("plugin not found");
-		return;
+		return 0;
 	    }
 	    *save = '|';
 	    if ((strlen(save) + strlen(fname) + 2) > PATHLEN) {
 		error("Path too long");
-		return;
+		return 0;
 	    }
 	    sprintf(save + strlen(save), " \"%s\"", fname);
 	    eraseflg = 0;