xd: add -R for runewise dump

Ported from Plan 9 2013-05-21.
b377a116d1

Closes #16.

man/man1/xd.1

@@ -66,6 +66,13 @@ but print
 .SM ASCII
 representations or C escape sequences where possible.
 .TP
+.B -R
+Format as
+.B 1x
+but print
+.B Rune
+representations or C escape sequences where possible.
+.TP
 .BI -a style
 Print file addresses in the given style (and size 4).
 .TP

src/cmd/xd.c

@@ -3,8 +3,9 @@
 #include <bio.h>
 
 unsigned char	odata[16];
-unsigned char	data[16];
+unsigned char	data[32];
 int		ndata;
+int		nread;
 unsigned long	addr;
 int		repeats;
 int		swizzle;
@@ -12,16 +13,20 @@ int		swizzle8;
 int		flush;
 int		abase=2;
 int		xd(char *, int);
-void		xprint(char *, ulong);
+void		xprint(char *, ...);
 void		initarg(void), swizz(void), swizz8(void);
 enum{
-	Narg=10
+	Narg=10,
+
+	TNone=0,
+	TAscii,
+	TRune,
 };
 typedef struct Arg Arg;
 typedef void fmtfn(char *);
 struct Arg
 {
-	int	ascii;		/* 0==none, 1==ascii */
+	int	chartype;	/* TNone, TAscii, TRunes */
 	int	loglen;		/* 0==1, 1==2, 2==4, 3==8 */
 	int	base;		/* 0==8, 1==10, 2==16 */
 	fmtfn	*fn;		/* function to call with data */
@@ -30,7 +35,7 @@ struct Arg
 }arg[Narg];
 int	narg;
 
-fmtfn	fmt0, fmt1, fmt2, fmt3, fmtc;
+fmtfn	fmt0, fmt1, fmt2, fmt3, fmtc, fmtr;
 fmtfn *fmt[4] = {
 	fmt0,
 	fmt1,
@@ -51,6 +56,10 @@ char *cfmt[3][3] = {
 	" %.3uo",	" %.3ud",	" %.2ux",
 };
 
+char *rfmt[1][1] = {
+	" %2.2C",
+};
+
 char *afmt[2][3] = {
 	"%.7luo ",	"%.7lud ",	"%.7lux ",
 	"%7luo ",	"%7lud ",	"%7lux ",
@@ -120,7 +129,13 @@ main(int argc, char *argv[])
 		while(argv[0][0]){
 			switch(argv[0][0]){
 			case 'c':
-				ap->ascii = 1;
+				ap->chartype = TAscii;
+				ap->loglen = 0;
+				if(argv[0][1] || argv[0][-1]!='-')
+					goto Usage;
+				break;
+			case 'R':
+				ap->chartype = TRune;
 				ap->loglen = 0;
 				if(argv[0][1] || argv[0][-1]!='-')
 					goto Usage;
@@ -157,7 +172,9 @@ main(int argc, char *argv[])
 			}
 			argv[0]++;
 		}
-		if(ap->ascii)
+		if(ap->chartype == TRune)
+			ap->fn = fmtr;
+		else if(ap->chartype == TAscii)
 			ap->fn = fmtc;
 		else
 			ap->fn = fmt[ap->loglen];
@@ -185,7 +202,7 @@ initarg(void)
 		fprint(2, "xd: too many formats (max %d)\n", Narg);
 		exits("usage");
 	}
-	ap->ascii = 0;
+	ap->chartype = TNone;
 	ap->loglen = 2;
 	ap->base = 2;
 	ap->fn = fmt2;
@@ -197,7 +214,7 @@ int
 xd(char *name, int title)
 {
 	int fd;
-	int i, star;
+	int i, star, nsee, nleft;
 	Arg *ap;
 	Biobuf *bp;
 
@@ -216,21 +233,29 @@ xd(char *name, int title)
 		xprint("%s\n", (long)name);
 	addr = 0;
 	star = 0;
-	while((ndata=Bread(bp, data, 16)) >= 0){
+	nsee = 16;
-		if(ndata < 16)
+	nleft = 0;
-			for(i=ndata; i<16; i++)
+	/* read 32 but see only 16 so that runes are happy */
+	while((ndata=Bread(bp, data + nleft, 32 - nleft)) >= 0){
+		ndata += nleft;
+		nleft = 0;
+		nread = ndata;
+		if(ndata>nsee)
+			ndata = nsee;
+		else if(ndata<nsee)
+			for(i=ndata; i<nsee; i++)
 				data[i] = 0;
 		if(swizzle)
 			swizz();
 		if(swizzle8)
 			swizz8();
-		if(ndata==16 && repeats){
+		if(ndata==nsee && repeats){
 			if(addr>0 && data[0]==odata[0]){
-				for(i=1; i<16; i++)
+				for(i=1; i<nsee; i++)
 					if(data[i] != odata[i])
 						break;
-				if(i == 16){
+				if(i == nsee){
-					addr += 16;
+					addr += nsee;
 					if(star == 0){
 						star++;
 						xprint("*\n", 0);
@@ -238,7 +263,7 @@ xd(char *name, int title)
 					continue;
 				}
 			}
-			for(i=0; i<16; i++)
+			for(i=0; i<nsee; i++)
 				odata[i] = data[i];
 			star = 0;
 		}
@@ -250,13 +275,17 @@ xd(char *name, int title)
 				Bflush(&bout);
 		}
 		addr += ndata;
-		if(ndata<16){
+		if(ndata<nsee){
 			xprint(afmt[0][abase], addr);
 			xprint("\n", 0);
 			if(flush)
 				Bflush(&bout);
 			break;
 		}
+		if(nread>nsee){
+			nleft = nread - nsee;
+			memmove(data, data + nsee, nleft);
+		}
 	}
 	Bterm(bp);
 	return 0;
@@ -353,13 +382,9 @@ fmt3(char *f)
 }
 
 void
-fmtc(char *f)
+onefmtc(uchar c)
 {
-	int i;
+	switch(c){
-
-	USED(f);
-	for(i=0; i<ndata; i++)
-		switch(data[i]){
 	case '\t':
 		xprint(cfmt[1][2], (long)"\\t");
 		break;
@@ -373,19 +398,65 @@ fmtc(char *f)
 		xprint(cfmt[1][2], (long)"\\b");
 		break;
 	default:
-			if(data[i]>=0x7F || ' '>data[i])
+		if(c>=0x7F || ' '>c)
-				xprint(cfmt[2][2], data[i]);
+			xprint(cfmt[2][2], c);
 		else
-				xprint(cfmt[0][2], data[i]);
+			xprint(cfmt[0][2], c);
 		break;
 	}
 }
 
 void
-xprint(char *fmt, ulong d)
+fmtc(char *f)
 {
-	if(Bprint(&bout, fmt, d)<0){
+	int i;
+
+	USED(f);
+	for(i=0; i<ndata; i++)
+		onefmtc(data[i]);
+}
+
+void
+fmtr(char *f)
+{
+	int i, w, cw;
+	Rune r;
+	static int nstart;
+
+	USED(f);
+	if(nstart)
+		xprint("%*c", 3*nstart, ' ');
+	for(i=nstart; i<ndata; )
+		if(data[i] < Runeself)
+			onefmtc(data[i++]);
+		else{
+			w = chartorune(&r, (char *)data+i);
+			if(w == 1 || i + w>nread)
+				onefmtc(data[i++]);
+			else{
+				cw = w;
+				if(i + w>ndata)
+					cw = ndata - i;
+				xprint(rfmt[0][0], r);
+				xprint("%*c", 3*cw-3, ' ');
+				i += w;
+			}
+		}
+	if(i > ndata)
+		nstart = i - ndata;
+	else
+		nstart = 0;
+}
+
+void
+xprint(char *fmt, ...)
+{
+	va_list arglist;
+
+	va_start(arglist, fmt);
+	if(Bvprint(&bout, fmt, arglist)<0){
 		fprint(2, "xd: i/o error\n");
 		exits("i/o error");
 	}
+	va_end(arglist);
 }