[hackers] [st] Fix crash due to wide characters || Rian Hunter

[git]

commit 4d14d97547d335974e98aa612ac5b4fcfc25e1d9
Author: Rian Hunter <rian+suckless-...@thelig.ht>
Date:   Thu Jan 29 15:06:43 2015 -0800

    Fix crash due to wide characters
    
    In tputc(), when a character wasn't large enough to fit
    on the current line, we would call tnewline() to place it on
    the next line. Unfortunately, we weren't resetting our glyph
    pointer and this caused memory corruption when a
    wide character (width == 2) was being written. This patch
    resets our glyph pointer after calls to tnewline().

diff --git a/st.c b/st.c
index db9a332..6a68c3c 100644
--- a/st.c
+++ b/st.c
@@ -2673,13 +2673,16 @@ tputc(char *c, int len) {
        if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
                gp->mode |= ATTR_WRAP;
                tnewline(1);
+               gp = &term.line[term.c.y][term.c.x];
        }
 
        if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
                memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
 
-       if(term.c.x+width > term.col)
+       if(term.c.x+width > term.col) {
                tnewline(1);
+               gp = &term.line[term.c.y][term.c.x];
+       }
 
        tsetchar(c, &term.c.attr, term.c.x, term.c.y);