From 02d8e8247fced0d290e59fca2b003ce6cae1ca06 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Tue, 7 Dec 2010 23:15:22 -0500
Subject: wc: 4-byte utf-8 capable (Erik Quanstrom)

R=rsc
http://codereview.appspot.com/3437044
---
 src/cmd/wc.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 59 insertions(+), 16 deletions(-)

(limited to 'src/cmd/wc.c')

diff --git a/src/cmd/wc.c b/src/cmd/wc.c
index 64a791de..60077595 100644
--- a/src/cmd/wc.c
+++ b/src/cmd/wc.c
@@ -97,12 +97,13 @@ report(uvlong nline, uvlong nword, uvlong nrune, uvlong nbadr, uvlong nchar, cha
  * following table.  If we're not in statesp or statewd when done, the
  * file ends with a partial rune.
  *        |                character
- *  state |09,20| 0a  |00-7f|80-bf|c0-df|e0-ef|f0-ff
- * -------+-----+-----+-----+-----+-----+-----+-----
- * statesp|ASP  |ASPN |AWDW |AWDWX|AC2W |AC3W |AWDWX
- * statewd|ASP  |ASPN |AWD  |AWDX |AC2  |AC3  |AWDX
- * statec2|ASPX |ASPNX|AWDX |AWDR |AC2X |AC3X |AWDX
- * statec3|ASPX |ASPNX|AWDX |AC2R |AC2X |AC3X |AWDX
+ *  state |09,20| 0a  |00-7f|80-bf|c0-df|e0-ef|f0-f7|f8-ff
+ * -------+-----+-----+-----+-----+-----+-----+-----+-----
+ * statesp|ASP  |ASPN |AWDW |AWDWX|AC2W |AC3W |AC4W |AWDWX
+ * statewd|ASP  |ASPN |AWD  |AWDX |AC2  |AC3  |AC4  |AWDX
+ * statec2|ASPX |ASPNX|AWDX |AWDR |AC2X |AC3X |AC4X |AWDX
+ * statec3|ASPX |ASPNX|AWDX |AC2R |AC2X |AC3X |AC4X |AWDX
+ * statec4|ASPX |ASPNX|AWDX |AC3R |AC2X |AC3X |AC4X |AWDX	f4 8f bf bf
  */
 enum{			/* actions */
 	AC2,		/* enter statec2 */
@@ -110,8 +111,12 @@ enum{			/* actions */
 	AC2W,		/* enter statec2, count a word */
 	AC2X,		/* enter statec2, count a bad rune */
 	AC3,		/* enter statec3 */
+	AC3R,		/* enter statec3, don't count a rune */
 	AC3W,		/* enter statec3, count a word */
 	AC3X,		/* enter statec3, count a bad rune */
+	AC4,		/* enter statec4 */
+	AC4W,		/* enter statec4, count a word */
+	AC4X,		/* enter statec4, count a bad rune */
 	ASP,		/* enter statesp */
 	ASPN,		/* enter statesp, count a newline */
 	ASPNX,		/* enter statesp, count a newline, count a bad rune */
@@ -120,7 +125,7 @@ enum{			/* actions */
 	AWDR,		/* enter statewd, don't count a rune */
 	AWDW,		/* enter statewd, count a word */
 	AWDWX,		/* enter statewd, count a word, count a bad rune */
-	AWDX		/* enter statewd, count a bad rune */
+	AWDX,		/* enter statewd, count a bad rune */
 };
 uchar statesp[256]={	/* looking for the start of a word */
 AWDW, AWDW, AWDW, AWDW, AWDW, AWDW, AWDW, AWDW,	/* 00-07 */
@@ -153,8 +158,8 @@ AC2W, AC2W, AC2W, AC2W, AC2W, AC2W, AC2W, AC2W,	/* d0-d7 */
 AC2W, AC2W, AC2W, AC2W, AC2W, AC2W, AC2W, AC2W,	/* d8-df */
 AC3W, AC3W, AC3W, AC3W, AC3W, AC3W, AC3W, AC3W,	/* e0-e7 */
 AC3W, AC3W, AC3W, AC3W, AC3W, AC3W, AC3W, AC3W,	/* e8-ef */
-AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,/* f0-f7 */
-AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX/* f8-ff */
+AC4W, AC4W, AC4W, AC4W, AC4W, AC4W, AC4W, AC4W, /* f0-f7 */
+AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,AWDWX,/* f8-ff */
 };
 uchar statewd[256]={	/* looking for the next character in a word */
 AWD,  AWD,  AWD,  AWD,  AWD,  AWD,  AWD,  AWD,	/* 00-07 */
@@ -187,8 +192,8 @@ AC2,  AC2,  AC2,  AC2,  AC2,  AC2,  AC2,  AC2,	/* d0-d7 */
 AC2,  AC2,  AC2,  AC2,  AC2,  AC2,  AC2,  AC2,	/* d8-df */
 AC3,  AC3,  AC3,  AC3,  AC3,  AC3,  AC3,  AC3,	/* e0-e7 */
 AC3,  AC3,  AC3,  AC3,  AC3,  AC3,  AC3,  AC3,	/* e8-ef */
-AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* f0-f7 */
-AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX	/* f8-ff */
+AC4,  AC4,  AC4,  AC4,  AC4,  AC4,  AC4,  AC4,	/* f0-f7 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* f8-ff */
 };
 uchar statec2[256]={	/* looking for 10xxxxxx to complete a rune */
 AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 00-07 */
@@ -221,8 +226,8 @@ AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* d0-d7 */
 AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* d8-df */
 AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X,	/* e0-e7 */
 AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X,	/* e8-ef */
-AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* f0-f7 */
-AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX	/* f8-ff */
+AC4X, AC4X, AC4X, AC4X, AC4X, AC4X, AC4X, AC4X,	/* f0-f7 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* f8-ff */
 };
 uchar statec3[256]={	/* looking for 10xxxxxx,10xxxxxx to complete a rune */
 AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 00-07 */
@@ -255,8 +260,42 @@ AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* d0-d7 */
 AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* d8-df */
 AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X,	/* e0-e7 */
 AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X,	/* e8-ef */
-AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* f0-f7 */
-AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX	/* f8-ff */
+AC4X, AC4X, AC4X, AC4X, AC4X, AC4X, AC4X, AC4X,	/* f0-f7 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* f8-ff */
+};
+uchar statec4[256]={	/* looking for 10xxxxxx,10xxxxxx,10xxxxxx to complete a rune */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 00-07 */
+AWDX, ASPX, ASPNX,AWDX, AWDX, AWDX, AWDX, AWDX,	/* 08-0f */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 10-17 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 18-1f */
+ASPX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 20-27 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 28-2f */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 30-37 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 38-3f */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 40-47 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 48-4f */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 50-57 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 58-5f */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 60-67 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 68-6f */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 70-77 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 78-7f */
+AC3R, AC3R, AC3R, AC3R, AC3R, AC3R, AC3R, AC3R,	/* 80-87 */
+AC3R, AC3R, AC3R, AC3R, AC3R, AC3R, AC3R, AC3R,	/* 88-8f */
+AC3R, AC3R, AC3R, AC3R, AC3R, AC3R, AC3R, AC3R,	/* 90-97 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* 98-9f */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* a0-a7 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* a8-af */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* b0-b7 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* b8-bf */
+AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* c0-c7 */
+AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* c8-cf */
+AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* d0-d7 */
+AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X, AC2X,	/* d8-df */
+AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X,	/* e0-e7 */
+AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X, AC3X,	/* e8-ef */
+AC4X, AC4X, AC4X, AC4X, AC4X, AC4X, AC4X, AC4X,	/* f0-f7 */
+AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX, AWDX,	/* f8-ff */
 };
 void
 count(int f, char *name)
@@ -287,8 +326,12 @@ count(int f, char *name)
 			case AC2W:  state=statec2; nword++;          break;
 			case AC2X:  state=statec2;          nbadr++; break;
 			case AC3:   state=statec3;                   break;
+			case AC3R:  state=statec3; --nrune;          break;
 			case AC3W:  state=statec3; nword++;          break;
 			case AC3X:  state=statec3;          nbadr++; break;
+			case AC4:   state=statec4;                   break;
+			case AC4W:  state=statec4; nword++;          break;
+			case AC4X:  state=statec4;          nbadr++; break;
 			case ASP:   state=statesp;                   break;
 			case ASPN:  state=statesp; nline++;          break;
 			case ASPNX: state=statesp; nline++; nbadr++; break;
@@ -304,6 +347,6 @@ count(int f, char *name)
 	if(state!=statesp && state!=statewd)
 		nbadr++;
 	if(n<0)
-		perror(name);
+		fprint(2, "%s: %r\n", name);
 	report(nline, nword, nrune, nbadr, nchar, name);
 }
-- 
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