[dev] [st utf8 4/4] Make tputc, tsetchar and techo accept unicode

---
 st.c | 107 ++++++++++++++++++++++++++++---------------------------------------
 1 file changed, 45 insertions(+), 62 deletions(-)
diff --git a/st.c b/st.c
index fa21c4e..3a37994 100644
--- a/st.c
+++ b/st.c
_AT_@ -383,20 +383,20 @@ static void tmoveato(int, int);
 static void tnew(int, int);
 static void tnewline(int);
 static void tputtab(int);
-static void tputc(char *, int);
+static void tputc(long);
 static void treset(void);
 static void tresize(int, int);
 static void tscrollup(int, int);
 static void tscrolldown(int, int);
 static void tsetattr(int *, int);
-static void tsetchar(char *, Glyph *, int, int);
+static void tsetchar(long, Glyph *, int, int);
 static void tsetscroll(int, int);
 static void tswapscreen(void);
 static void tsetdirt(int, int);
 static void tsetdirtattr(int);
 static void tsetmode(bool, bool, int *, int);
 static void tfulldirt(void);
-static void techo(char *, int);
+static void techo(long);
 static void tcontrolcode(uchar );
 static void tdectest(char );
 static int32_t tdefcolor(int *, int *, int);
_AT_@ -1331,7 +1331,6 @@ ttyread(void) {
 	static char buf[BUFSIZ];
 	static int buflen = 0;
 	char *ptr;
-	char s[UTF_SIZ];
 	int charsize; /* size of utf8 char in bytes */
 	long unicodep;
 	int ret;
_AT_@ -1344,8 +1343,7 @@ ttyread(void) {
 	buflen += ret;
 	ptr = buf;
 	while((charsize = utf8decode(ptr, &unicodep, buflen))) {
-		utf8encode(unicodep, s);
-		tputc(s, charsize);
+		tputc(unicodep);
 		ptr += charsize;
 		buflen -= charsize;
 	}
_AT_@ -1362,9 +1360,16 @@ ttywrite(const char *s, size_t n) {
 
 void
 ttysend(char *s, size_t n) {
+	int len;
+	long u;
+
 	ttywrite(s, n);
 	if(IS_SET(MODE_ECHO))
-		techo(s, n);
+		while((len = utf8decode(s, &u, n)) > 0) {
+			techo(u);
+			n -= len;
+			s += len;
+		}
 }
 
 void
_AT_@ -1613,7 +1618,7 @@ tmoveto(int x, int y) {
 }
 
 void
-tsetchar(char *c, Glyph *attr, int x, int y) {
+tsetchar(long u, Glyph *attr, int x, int y) {
 	static char *vt100_0[62] = { /* 0x41 - 0x7e */
 		"↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
 		0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
_AT_@ -1628,11 +1633,9 @@ tsetchar(char *c, Glyph *attr, int x, int y) {
 	/*
 	 * The table is proudly stolen from rxvt.
 	 */
-	if(term.trantbl[term.charset] == CS_GRAPHIC0) {
-		if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
-			c = vt100_0[c[0] - 0x41];
-		}
-	}
+	if(term.trantbl[term.charset] == CS_GRAPHIC0 &&
+	   BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
+		utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
 
 	if(term.line[y][x].mode & ATTR_WIDE) {
 		if(x+1 < term.col) {
_AT_@ -1646,7 +1649,7 @@ tsetchar(char *c, Glyph *attr, int x, int y) {
 
 	term.dirty[y] = 1;
 	term.line[y][x] = *attr;
-	utf8decode(c, &term.line[y][x].u, UTF_SIZ);
+	term.line[y][x].u = u;
 }
 
 void
_AT_@ -2431,26 +2434,18 @@ tputtab(int n) {
 }
 
 void
-techo(char *buf, int len) {
-	for(; len > 0; buf++, len--) {
-		char c = *buf;
-
-		if(ISCONTROL((uchar) c)) { /* control code */
-			if(c & 0x80) {
-				c &= 0x7f;
-				tputc("^", 1);
-				tputc("[", 1);
-			} else if(c != '\n' && c != '\r' && c != '\t') {
-				c ^= 0x40;
-				tputc("^", 1);
-			}
-			tputc(&c, 1);
-		} else {
-			break;
+techo(long u) {
+	if(ISCONTROL(u)) { /* control code */
+		if(u & 0x80) {
+			u &= 0x7f;
+			tputc('^');
+			tputc('[');
+		} else if(u != '\n' && u != '\r' && u != '\t') {
+			u ^= 0x40;
+			tputc('^');
 		}
 	}
-	if(len)
-		tputc(buf, len);
+	tputc(u);
 }
 
 void
_AT_@ -2468,13 +2463,12 @@ tdeftran(char ascii) {
 
 void
 tdectest(char c) {
-	static char E[UTF_SIZ] = "E";
 	int x, y;
 
 	if(c == '8') { /* DEC screen alignment test. */
 		for(x = 0; x < term.col; ++x) {
 			for(y = 0; y < term.row; ++y)
-				tsetchar(E, &term.c.attr, x, y);
+				tsetchar('E', &term.c.attr, x, y);
 		}
 	}
 }
_AT_@ -2502,8 +2496,6 @@ tstrsequence(uchar c) {
 
 void
 tcontrolcode(uchar ascii) {
-	static char question[UTF_SIZ] = "?";
-
 	switch(ascii) {
 	case '\t':   /* HT */
 		tputtab(1);
_AT_@ -2541,7 +2533,7 @@ tcontrolcode(uchar ascii) {
 		term.charset = 1 - (ascii - '\016');
 		return;
 	case '\032': /* SUB */
-		tsetchar(question, &term.c.attr, term.c.x, term.c.y);
+		tsetchar('?', &term.c.attr, term.c.x, term.c.y);
 	case '\030': /* CAN */
 		csireset();
 		break;
_AT_@ -2665,28 +2657,21 @@ eschandle(uchar ascii) {
 }
 
 void
-tputc(char *c, int len) {
-	uchar ascii;
+tputc(long u) {
+	char c[UTF_SIZ];
 	bool control;
-	long unicodep;
-	int width;
+	int width, len;
 	Glyph *gp;
 
-	if(len == 1) {
+	len = utf8encode(u, c);
+	if((width = wcwidth(u)) == -1) {
+		memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
 		width = 1;
-		unicodep = ascii = *c;
-	} else {
-		utf8decode(c, &unicodep, UTF_SIZ);
-		if ((width = wcwidth(unicodep)) == -1) {
-			c = "\357\277\275";	/* UTF_INVALID */
-			width = 1;
-		}
-		ascii = unicodep;
 	}
 
 	if(IS_SET(MODE_PRINT))
 		tprinter(c, len);
-	control = ISCONTROL(unicodep);
+	control = ISCONTROL(u);
 
 	/*
 	 * STR sequence must be checked before anything else
_AT_@ -2695,10 +2680,8 @@ tputc(char *c, int len) {
 	 * character.
 	 */
 	if(term.esc & ESC_STR) {
-		if(len == 1 &&
-		   (ascii == '\a' || ascii == 030 ||
-		    ascii == 032  || ascii == 033 ||
-		    ISCONTROLC1(unicodep))) {
+		if(u == '\a' || u == 030 || u == 032 || u == 033 ||
+		   ISCONTROLC1(u)) {
 			term.esc &= ~(ESC_START|ESC_STR);
 			term.esc |= ESC_STR_END;
 		} else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
_AT_@ -2729,15 +2712,15 @@ tputc(char *c, int len) {
 	 * they must not cause conflicts with sequences.
 	 */
 	if(control) {
-		tcontrolcode(ascii);
+		tcontrolcode(u);
 		/*
 		 * control codes are not shown ever
 		 */
 		return;
 	} else if(term.esc & ESC_START) {
 		if(term.esc & ESC_CSI) {
-			csiescseq.buf[csiescseq.len++] = ascii;
-			if(BETWEEN(ascii, 0x40, 0x7E)
+			csiescseq.buf[csiescseq.len++] = u;
+			if(BETWEEN(u, 0x40, 0x7E)
 					|| csiescseq.len >= \
 					sizeof(csiescseq.buf)-1) {
 				term.esc = 0;
_AT_@ -2746,11 +2729,11 @@ tputc(char *c, int len) {
 			}
 			return;
 		} else if(term.esc & ESC_ALTCHARSET) {
-			tdeftran(ascii);
+			tdeftran(u);
 		} else if(term.esc & ESC_TEST) {
-			tdectest(ascii);
+			tdectest(u);
 		} else {
-			if (!eschandle(ascii))
+			if (!eschandle(u))
 				return;
 			/* sequence already finished */
 		}
_AT_@ -2779,7 +2762,7 @@ tputc(char *c, int len) {
 		gp = &term.line[term.c.y][term.c.x];
 	}
 
-	tsetchar(c, &term.c.attr, term.c.x, term.c.y);
+	tsetchar(u, &term.c.attr, term.c.x, term.c.y);
 
 	if(width == 2) {
 		gp->mode |= ATTR_WIDE;
-- 
1.8.4