ed

commit 7b4af7e0476a5ef0427e2f66921dd164052ed06f
parent f7835588a3b9d7411ecbbdbe133191ccec714e50
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sun, 13 Dec 2015 20:47:51 +0100

Undo only last command

It is important to discard the undo data of
previous commands, because in other case
undo() will undo all the edit work.

Diffstat:
M
ed.c
 | 
7
+++++++

1 file changed, 7 insertions(+), 0 deletions(-)
diff --git a/ed.c b/ed.c
@@ -60,6 +60,7 @@ int repidx;
 char *rhs;
 char *lastmatch;
 struct undo udata;
+int newcmd;
 
 static void
 error(char *msg)
@@ -230,6 +231,11 @@ relink(int to1, int from1, int from2, int to2)
 {
 	struct link *p;
 
+	if (newcmd) {
+		free(udata.vec);
+		udata.vec = NULL;
+		newcmd = udata.nr = udata.cap = 0;
+	}
 	if (udata.nr >= udata.cap) {
 		size_t siz = (udata.cap + 10) * sizeof(struct link);
 		if ((p = realloc(udata.vec, siz)) == NULL)
@@ -1352,6 +1358,7 @@ main(int argc, char *argv[])
 	}
 
 	for (;;) {
+		newcmd = 1;
 		cmdsiz = 0;
 		repidx = -1;
 		if (optprompt)