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db: fix unicode support (thanks giacomo)

from the unicode-db patch readme:

command() receives a char* that is assigned to lp, which is a Rune*,
and lp is incremented later in readchar(), so each read consumed 4 bytes.
The only time command() is called is in runpcs() with bkpt->comm,
which is a char* built in subpcs through a char*, so the string stored in
bkpt->comm was not a Rune string. A way to test the bug is:

db program
main:b argv/X
:r

--- a/sys/src/cmd/db/command.c

+++ b/sys/src/cmd/db/command.c

@@ -23,8 +23,8 @@

 int	adrflg, cntflg;

 /* command decoding */

-

-command(char *buf, int defcom)

+int

+command(Rune *buf, int defcom)

 {

 	char	*reg;

 	char	savc;

@@ -39,7 +39,7 @@

 		if (*buf==EOR)

 			return(FALSE);

 		clrinp();

-		lp=(Rune*)buf;

+		lp=buf;

 	}

 	do {

 		adrflg=expr(0);		/* first address */

--- a/sys/src/cmd/db/defs.h

+++ b/sys/src/cmd/db/defs.h

@@ -64,7 +64,7 @@

 	int	count;

 	int	initcnt;

 	int	flag;

-	char	comm[MAXCOM];

+	Rune	comm[MAXCOM];

 	BKPT	*nxtbkpt;

 };

--- a/sys/src/cmd/db/fns.h

+++ b/sys/src/cmd/db/fns.h

@@ -8,7 +8,7 @@

 void		cmdmap(Map*);

 void		cmdsrc(int, Map*);

 void		cmdwrite(int, Map*);

-int		command(char*, int);

+int		command(Rune*, int);

 int		convdig(int);

 void		ctrace(int);

 WORD		defval(WORD);

--- a/sys/src/cmd/db/pcs.c

+++ b/sys/src/cmd/db/pcs.c

@@ -20,7 +20,7 @@

 	int	n, r;

 	long line, curr;

 	BKPT *bk;

-	char *comptr;

+	Rune *comptr;

 	runmode=SINGLE;

 	r = 0;

--- a/sys/src/cmd/db/print.c

+++ b/sys/src/cmd/db/print.c

@@ -166,7 +166,7 @@

 				dprint(buf);

 				if (bk->count != 1)

 					dprint(",%d", bk->count);

-				dprint(":%c %s", bk->flag == BKPTTMP ? 'B' : 'b', bk->comm);

+				dprint(":%c %S", bk->flag == BKPTTMP ? 'B' : 'b', bk->comm);

 			}

 		break;