Simplify a bit more tdeletechar and tinsertblank

The large and repeated expression used in memmove to indirect
the line can be simplified using a pointer, that makes more
clear where begins and where ends the movement.

1 files changed, 6 insertions, 4 deletions

diff --git a/st.c b/st.c
index 263abaa..e468d73 100644
--- a/st.c
+++ b/st.c
@@ -1587,30 +1587,32 @@ tclearregion(int x1, int y1, int x2, int y2) {
 void
 tdeletechar(int n) {
         int dst, src, size;
+        Glyph *line;
 
         LIMIT(n, 0, term.col - term.c.x);
 
         dst = term.c.x;
         src = term.c.x + n;
         size = term.col - src;
+        line = term.line[term.c.y];
 
-        memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
-                size * sizeof(Glyph));
+        memmove(&line[dst], &line[src], size * sizeof(Glyph));
         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 }
 
 void
 tinsertblank(int n) {
         int dst, src, size;
+        Glyph *line;
 
         LIMIT(n, 0, term.col - term.c.x);
 
         dst = term.c.x + n;
         src = term.c.x;
         size = term.col - dst;
+        line = term.line[term.c.y];
 
-        memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
-                size * sizeof(Glyph));
+        memmove(&line[dst], &line[src], size * sizeof(Glyph));
         tclearregion(src, term.c.y, dst - 1, term.c.y);
 }