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look: add -b for specifying numeric base

--- a/sys/man/1/look

+++ b/sys/man/1/look

@@ -4,9 +4,17 @@

 .SH SYNOPSIS

 .B look

 [

-.BI -dfnixt c

+.BI -dfnix

 ]

 [

+.B -t

+.I c

+]

+[

+.B -b

+.I base

+]

+[

 .I string

 ]

 [

@@ -52,6 +60,11 @@

 .B -n

 Numeric comparison with initial string of digits, optional minus sign,

 and optional decimal point.

+.TP

+.B -b \f2base\f1

+Change the base for numeric comparison. Implies the

+.B -n

+flag.

 .TP

 .BR -t [ \f2c\f1 ]

 Character

--- a/sys/src/cmd/look.c

+++ b/sys/src/cmd/look.c

@@ -8,10 +8,8 @@

 #define	isalpha(r)	(isupper(r) || islower(r))

 #define	islatin1(r)	(0xC0 <= (r) && (r) <= 0xFF)

-#define	isdigit(r)	(L'0' <= (r) && (r) <= L'9')

+#define	isalnum(r)	(isalpha(r) || (L'0' <= (r) && (r) <= L'9'))

-#define	isalnum(r)	(isalpha(r) || isdigit(r))

-

 #define	isspace(r)	((r) == L' ' || (r) == L'\t' \

 			|| (0x0A <= (r) && (r) <= 0x0D))

@@ -18,6 +16,7 @@

 #define	tolower(r)	((r)-'A'+'a')

 #define	sgn(v)		((v) < 0 ? -1 : ((v) > 0 ? 1 : 0))

+#define	notcase(v)	(v != L'a'-L'A' && v != L'A'-L'a')

 #define	WORDSIZ	4000

 char	*filename = "/lib/words";

@@ -29,6 +28,7 @@

 int	direc;

 int	exact;

 int	iflag;

+int	base;

 int	rev = 1;	/*-1 for reverse-ordered file, not implemented*/

 int	(*compare)(Rune*, Rune*);

 Rune	tab = '\t';

@@ -65,6 +65,7 @@

 void	torune(char*, Rune*);

 void	rcanon(Rune*, Rune*);

 int	ncomp(Rune*, Rune*);

+int	isdigit(Rune);

 void

 usage(void)

@@ -81,7 +82,12 @@

 	Binit(&bin, 0, OREAD);

 	Binit(&bout, 1, OWRITE);

 	compare = acomp;

+	base = 10;

 	ARGBEGIN{

+	case 'b':

+		base = atoi(EARGF(usage()));

+		compare = ncomp;

+		break;

 	case 'd':

 		direc++;

 		break;

@@ -299,7 +305,7 @@

 	a = 0;

 	if(ssgn == tsgn)

 		while(it>t && is>s)

-			if(b = *--it - *--is)

+			if((b = *--it - *--is) && notcase(b))

 				a = b;

 	while(is > s)

 		if(*--is != '0')

@@ -315,7 +321,7 @@

 		t++;

 	if(ssgn == tsgn)

 		while(isdigit(*s) && isdigit(*t))

-			if(a = *t++ - *s++)

+			if((a = *t++ - *s++) && notcase(a))

 				return sgn(a)*ssgn;

 	while(isdigit(*s))

 		if(*s++ != '0')

@@ -342,5 +348,22 @@

 		*rp++ = c;

 	}

 	fprint(2, "Look: word too long.  Bailing out.\n");

+	return 0;

+}

+

+int

+isdigit(Rune r)

+{

+	int v;

+

+	v = base;

+	if(L'0'<=r && r<=L'9')

+		v = r - L'0';

+	else if(L'a'<=r && r<=L'z')

+		v = r - L'a' + 10;

+	else if(L'A'<=r && r<=L'Z')

+		v = r - L'A' + 10;

+	if(v < base)

+		return 1;

 	return 0;

 }