Remove non defined behaviour in selcopy

It is not defined when lateral effects of expressions are
calculated, so an expression as:

	--last >= gp && !(selected(last - gp, y)

is non portable.

1 files changed, 5 insertions, 4 deletions

diff --git a/st.c b/st.c
index c59bf1d..6e7077a 100644
--- a/st.c
+++ b/st.c
@@ -953,11 +953,12 @@ selcopy(void) {
                 /* append every set & selected glyph to the selection */
                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
                         gp = &term.line[y][0];
-                        last = gp + term.col;
+                        last = &gp[term.col-1];
 
-                        while(--last >= gp && !(selected(last - gp, y) && \
-                                                strcmp(last->c, " ") != 0))
-                                /* nothing */;
+                        while(last >= gp && !(selected(last - gp, y) &&
+                                              strcmp(last->c, " ") != 0)) {
+                                --last;
+                        }
 
                         for(x = 0; gp <= last; x++, ++gp) {
                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))