Change internal character representation.

diff --git a/st.c b/st.c
index 8ca310c..2788746 100644 (file)
--- a/st.c
+++ b/st.c
@@ -72,6 +72,7 @@ char *argv0;
 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
+#define ISDELIM(u) (BETWEEN(u, 0, 127) && strchr(worddelimiters, u) != NULL)
 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
 #define IS_SET(flag) ((term.mode & (flag)) != 0)
@@ -180,7 +181,7 @@ typedef XftDraw *Draw;
 typedef XftColor Color;
 
 typedef struct {
-       char c[UTF_SIZ]; /* character code */
+       long u;           /* character code */
        ushort mode;      /* attribute flags */
        uint32_t fg;      /* foreground  */
        uint32_t bg;      /* background  */
@@ -410,6 +411,7 @@ static void tstrsequence(uchar);
 
 static inline ushort sixd_to_16bit(int);
 static void xdraws(char *, Glyph, int, int, int, int);
+static void xdrawglyph(Glyph, int, int);
 static void xhints(void);
 static void xclear(int, int, int, int);
 static void xdrawcursor(void);
@@ -461,7 +463,6 @@ static size_t utf8decode(char *, long *, size_t);
 static long utf8decodebyte(char, size_t *);
 static size_t utf8encode(long, char *);
 static char utf8encodebyte(long, size_t);
-static size_t utf8len(char *);
 static size_t utf8validate(long *, size_t);
 
 static ssize_t xwrite(int, const char *, size_t);
@@ -629,11 +630,6 @@ utf8encodebyte(long u, size_t i) {
        return utfbyte[i] | (u & ~utfmask[i]);
 }
 
-size_t
-utf8len(char *c) {
-       return utf8decode(c, &(long){0}, UTF_SIZ);
-}
-
 size_t
 utf8validate(long *u, size_t i) {
        if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
@@ -679,7 +675,7 @@ tlinelen(int y) {
        if(term.line[y][i - 1].mode & ATTR_WRAP)
                return i;
 
-       while(i > 0 && term.line[y][i - 1].c[0] == ' ')
+       while(i > 0 && term.line[y][i - 1].u == ' ')
                --i;
 
        return i;
@@ -736,7 +732,7 @@ selsnap(int mode, int *x, int *y, int direction) {
                 * beginning of a line.
                 */
                prevgp = &term.line[*y][*x];
-               prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
+               prevdelim = ISDELIM(prevgp->u);
                for(;;) {
                        newx = *x + direction;
                        newy = *y;
@@ -758,9 +754,9 @@ selsnap(int mode, int *x, int *y, int direction) {
                                break;
 
                        gp = &term.line[newy][newx];
-                       delim = strchr(worddelimiters, gp->c[0]) != NULL;
+                       delim = ISDELIM(gp->u);
                        if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
-                                       || (delim && gp->c[0] != prevgp->c[0])))
+                                       || (delim && gp->u != prevgp->u)))
                                break;
 
                        *x = newx;
@@ -936,7 +932,7 @@ bpress(XEvent *e) {
 char *
 getsel(void) {
        char *str, *ptr;
-       int y, bufsize, size, lastx, linelen;
+       int y, bufsize, lastx, linelen;
        Glyph *gp, *last;
 
        if(sel.ob.x == -1)
@@ -957,16 +953,14 @@ getsel(void) {
                        lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
                }
                last = &term.line[y][MIN(lastx, linelen-1)];
-               while(last >= gp && last->c[0] == ' ')
+               while(last >= gp && last->u == ' ')
                        --last;
 
                for( ; gp <= last; ++gp) {
                        if(gp->mode & ATTR_WDUMMY)
                                continue;
 
-                       size = utf8len(gp->c);
-                       memcpy(ptr, gp->c, size);
-                       ptr += size;
+                       ptr += utf8encode(gp->u, ptr);
                }
 
                /*
@@ -1643,17 +1637,17 @@ tsetchar(char *c, Glyph *attr, int x, int y) {
 
        if(term.line[y][x].mode & ATTR_WIDE) {
                if(x+1 < term.col) {
-                       term.line[y][x+1].c[0] = ' ';
+                       term.line[y][x+1].u = ' ';
                        term.line[y][x+1].mode &= ~ATTR_WDUMMY;
                }
        } else if(term.line[y][x].mode & ATTR_WDUMMY) {
-               term.line[y][x-1].c[0] = ' ';
+               term.line[y][x-1].u = ' ';
                term.line[y][x-1].mode &= ~ATTR_WIDE;
        }
 
        term.dirty[y] = 1;
        term.line[y][x] = *attr;
-       memcpy(term.line[y][x].c, c, UTF_SIZ);
+       utf8decode(c, &term.line[y][x].u, UTF_SIZ);
 }
 
 void
@@ -1680,7 +1674,7 @@ tclearregion(int x1, int y1, int x2, int y2) {
                        gp->fg = term.c.attr.fg;
                        gp->bg = term.c.attr.bg;
                        gp->mode = 0;
-                       memcpy(gp->c, " ", 2);
+                       gp->u = ' ';
                }
        }
 }
@@ -2400,13 +2394,14 @@ tdumpsel(void) {
 
 void
 tdumpline(int n) {
+       char buf[UTF_SIZ];
        Glyph *bp, *end;
 
        bp = &term.line[n][0];
        end = &bp[MIN(tlinelen(n), term.col) - 1];
-       if(bp != end || bp->c[0] != ' ') {
+       if(bp != end || bp->u != ' ') {
                for( ;bp <= end; ++bp)
-                       tprinter(bp->c, utf8len(bp->c));
+                       tprinter(buf, utf8encode(bp->u, buf));
        }
        tprinter("\n", 1);
 }
@@ -2789,7 +2784,7 @@ tputc(char *c, int len) {
        if(width == 2) {
                gp->mode |= ATTR_WIDE;
                if(term.c.x+1 < term.col) {
-                       gp[1].c[0] = '\0';
+                       gp[1].u = '\0';
                        gp[1].mode = ATTR_WDUMMY;
                }
        }
@@ -3552,11 +3547,20 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
        XftDrawSetClip(xw.draw, 0);
 }
 
+void
+xdrawglyph(Glyph g, int x, int y) {
+       static char buf[UTF_SIZ];
+       size_t len = utf8encode(g.u, buf);
+       int width = g.mode & ATTR_WIDE ? 2 : 1;
+
+       xdraws(buf, g, x, y, width, len);
+}
+
 void
 xdrawcursor(void) {
        static int oldx = 0, oldy = 0;
-       int sl, width, curx;
-       Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
+       int curx;
+       Glyph g = {' ', ATTR_NULL, defaultbg, defaultcs};
 
        LIMIT(oldx, 0, term.col-1);
        LIMIT(oldy, 0, term.row-1);
@@ -3569,13 +3573,10 @@ xdrawcursor(void) {
        if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
                curx--;
 
-       memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
+       g.u = term.line[term.c.y][term.c.x].u;
 
        /* remove the old cursor */
-       sl = utf8len(term.line[oldy][oldx].c);
-       width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
-       xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
-                       oldy, width, sl);
+       xdrawglyph(term.line[oldy][oldx], oldx, oldy);
 
        if(IS_SET(MODE_HIDE))
                return;
@@ -3592,10 +3593,8 @@ xdrawcursor(void) {
                                                g.bg = defaultfg;
                                        }
 
-                               sl = utf8len(g.c);
-                               width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
-                                       ? 2 : 1;
-                               xdraws(g.c, g, term.c.x, term.c.y, width, sl);
+                               g.mode |= term.line[term.c.y][curx].mode & ATTR_WIDE;
+                               xdrawglyph(g, term.c.x, term.c.y);
                                break;
                        case 3: /* Blinking Underline */
                        case 4: /* Steady Underline */
@@ -3668,7 +3667,7 @@ draw(void) {
 
 void
 drawregion(int x1, int y1, int x2, int y2) {
-       int ic, ib, x, y, ox, sl;
+       int ic, ib, x, y, ox;
        Glyph base, new;
        char buf[DRAW_BUF_SIZ];
        bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
@@ -3700,9 +3699,7 @@ drawregion(int x1, int y1, int x2, int y2) {
                                base = new;
                        }
 
-                       sl = utf8len(new.c);
-                       memcpy(buf+ib, new.c, sl);
-                       ib += sl;
+                       ib += utf8encode(new.u, buf+ib);
                        ic += (new.mode & ATTR_WIDE)? 2 : 1;
                }
                if(ib > 0)