fix a few minor compatibility issues.

- let eval() handle a base and number of digits, like it's advertized to.
- in gnu-mode, undivert can take file names as arguments.
- in gnu-mode, map can handle reversed charsets.

Suggestions and okay otto@, mostly prompted by looking at the regress
tests in newer gnu-m4.

usr.bin/m4/eval.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: eval.c,v 1.55 2005/03/02 10:12:15 espie Exp $	*/
+/*	$OpenBSD: eval.c,v 1.56 2005/05/29 18:44:36 espie Exp $	*/
 /*	$NetBSD: eval.c,v 1.7 1996/11/10 21:21:29 pk Exp $	*/
 
 /*
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "@(#)eval.c	8.2 (Berkeley) 4/27/95";
 #else
-static char rcsid[] = "$OpenBSD: eval.c,v 1.55 2005/03/02 10:12:15 espie Exp $";
+static char rcsid[] = "$OpenBSD: eval.c,v 1.56 2005/05/29 18:44:36 espie Exp $";
 #endif
 #endif /* not lint */
 
@@ -49,6 +49,7 @@ static char rcsid[] = "$OpenBSD: eval.c,v 1.55 2005/03/02 10:12:15 espie Exp $";
 
 #include <sys/types.h>
 #include <errno.h>
+#include <limits.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -178,9 +179,27 @@ expand_builtin(const char *argv[], int argc, int td)
 	 * doexpr - evaluate arithmetic
 	 * expression
 	 */
+	{
+		int base = 10;
+		int maxdigits = 0;
+		const char *errstr;
+
+		if (argc > 3) {
+			base = strtonum(argv[3], 2, 36, &errstr);
+			if (errstr) {
+				errx(1, "base %s invalid", argv[3]);
+			}
+		}
+		if (argc > 4) {
+			maxdigits = strtonum(argv[4], 0, INT_MAX, &errstr);
+			if (errstr) {
+				errx(1, "maxdigits %s invalid", argv[4]);
+			}
+		}
 		if (argc > 2)
-			pbnum(expr(argv[2]));
+			pbnumbase(expr(argv[2]), base, maxdigits);
 		break;
+	}
 
 	case IFELTYPE:
 		if (argc > 4)
@@ -866,10 +885,15 @@ doundiv(const char *argv[], int argc)
 
 	if (argc > 2) {
 		for (ind = 2; ind < argc; ind++) {
-			n = atoi(argv[ind]);
-			if (n > 0 && n < maxout && outfile[n] != NULL)
-				getdiv(n);
-
+			const char *errstr;
+			n = strtonum(argv[ind], 1, INT_MAX, &errstr);
+			if (errstr) {
+				if (errno == EINVAL && mimic_gnu)
+					getdivfile(argv[ind]);
+			} else {
+				if (n < maxout && outfile[n] != NULL)
+					getdiv(n);
+			}
 		}
 	}
 	else
@@ -1011,12 +1035,23 @@ handledash(char *buffer, char *end, const char *src)
 	while(*src) {
 		if (src[1] == '-' && src[2]) {
 			unsigned char i;
-			for (i = (unsigned char)src[0]; 
-			    i <= (unsigned char)src[2]; i++) {
-				*p++ = i;
-				if (p == end) {
-					*p = '\0';
-					return buffer;
+			if ((unsigned char)src[0] <= (unsigned char)src[2]) {
+				for (i = (unsigned char)src[0]; 
+				    i <= (unsigned char)src[2]; i++) {
+					*p++ = i;
+					if (p == end) {
+						*p = '\0';
+						return buffer;
+					}
+				}
+			} else {
+				for (i = (unsigned char)src[0]; 
+				    i >= (unsigned char)src[2]; i--) {
+					*p++ = i;
+					if (p == end) {
+						*p = '\0';
+						return buffer;
+					}
 				}
 			}
 			src += 3;

usr.bin/m4/extern.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: extern.h,v 1.40 2005/03/02 10:12:15 espie Exp $	*/
+/*	$OpenBSD: extern.h,v 1.41 2005/05/29 18:44:36 espie Exp $	*/
 /*	$NetBSD: extern.h,v 1.3 1996/01/13 23:25:24 pk Exp $	*/
 
 /*-
@@ -55,6 +55,7 @@ extern void doprintlineno(struct input_file *);
 extern void doprintfilename(struct input_file *);
 
 extern void doesyscmd(const char *);
+extern void	getdivfile(const char *);
  
 
 /* look.c */
@@ -96,6 +97,7 @@ extern void 	initspaces(void);
 extern void	killdiv(void);
 extern void	onintr(int);
 extern void	pbnum(int);
+extern void	pbnumbase(int, int, int);
 extern void	pbunsigned(unsigned long);
 extern void	pbstr(const char *);
 extern void	putback(int);

usr.bin/m4/gnum4.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: gnum4.c,v 1.30 2005/05/21 10:33:48 espie Exp $ */
+/* $OpenBSD: gnum4.c,v 1.31 2005/05/29 18:44:36 espie Exp $ */
 
 /*
  * Copyright (c) 1999 Marc Espie
@@ -551,3 +551,18 @@ doesyscmd(const char *cmd)
 		pbstr(getstring());
 	}
 }
+
+void
+getdivfile(const char *name)
+{
+	FILE *f;
+	int c;
+
+	f = fopen(name, "r");
+	if (!f)
+		return;
+
+	while ((c = getc(f))!= EOF)
+		putc(c, active);
+	(void) fclose(f);
+}

usr.bin/m4/misc.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: misc.c,v 1.30 2003/11/17 17:12:10 espie Exp $	*/
+/*	$OpenBSD: misc.c,v 1.31 2005/05/29 18:44:36 espie Exp $	*/
 /*	$NetBSD: misc.c,v 1.6 1995/09/28 05:37:41 tls Exp $	*/
 
 /*
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "@(#)misc.c	8.1 (Berkeley) 6/6/93";
 #else
-static char rcsid[] = "$OpenBSD: misc.c,v 1.30 2003/11/17 17:12:10 espie Exp $";
+static char rcsid[] = "$OpenBSD: misc.c,v 1.31 2005/05/29 18:44:36 espie Exp $";
 #endif
 #endif /* not lint */
 
@@ -119,13 +119,33 @@ pbstr(const char *s)
 void
 pbnum(int n)
 {
+	pbnumbase(n, 10, 0);
+}
+
+void
+pbnumbase(int n, int base, int d)
+{
+	static char digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz";
 	int num;
+	int printed = 0;
+
+	if (base > 36)
+		errx(1, "base %d > 36: not supported", base);
+
+	if (base < 2)
+		errx(1, "bad base %d for conversion", base);
 
 	num = (n < 0) ? -n : n;
 	do {
-		putback(num % 10 + '0');
+		putback(digits[num % base]);
+		printed++;
 	}
-	while ((num /= 10) > 0);
+	while ((num /= base) > 0);
+
+	if (n < 0)
+		printed++;
+	while (printed++ < d)
+		putback('0');
 
 	if (n < 0)
 		putback('-');