incorporate changes from Google

src/lib9/fmt/LICENSE

@@ -2,16 +2,18 @@
  * The authors of this software are Rob Pike and Ken Thompson,
  * with contributions from Mike Burrows and Sean Dorward.
  *
- *              Copyright (c) 2002-2006 by Lucent Technologies.
+ *     Copyright (c) 2002-2006 by Lucent Technologies.
+ *     Portions Copyright (c) 2004 Google Inc.
+ * 
  * Permission to use, copy, modify, and distribute this software for any
  * purpose without fee is hereby granted, provided that this entire notice
  * is included in all copies of any software which is or includes a copy
  * or modification of this software and in all copies of the supporting
  * documentation for such software.
  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
- * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
- * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
+ * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES 
+ * NOR GOOGLE INC MAKE ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING 
+ * THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
  */
 
 This is a Unix port of the Plan 9 formatted I/O package.

src/lib9/fmt/dofmt.c

@@ -1,4 +1,6 @@
 /* Copyright (c) 2002-2006 Lucent Technologies; see LICENSE */
+/* Copyright (c) 2004 Google Inc.; see LICENSE */
+
 #include <stdarg.h>
 #include <string.h>
 #include "plan9.h"
@@ -454,11 +456,26 @@ __ifmt(Fmt *f)
 		}
 	}
 	if(n == 0){
-		*p-- = '0';
-		n = 1;
-		if(fl & FmtApost)
-			__needsep(&ndig, &grouping);
-		fl &= ~FmtSharp;	/* ??? */
+		/*
+		 * "The result of converting a zero value with
+		 * a precision of zero is no characters."  - ANSI
+		 *
+		 * "For o conversion, # increases the precision, if and only if
+		 * necessary, to force the first digit of the result to be a zero
+		 * (if the value and precision are both 0, a single 0 is printed)." - ANSI
+		 */
+		if(!(fl & FmtPrec) || f->prec != 0 || (f->r == 'o' && (fl & FmtSharp))){
+			*p-- = '0';
+			n = 1;
+			if(fl & FmtApost)
+				__needsep(&ndig, &grouping);
+		}
+		
+		/*
+		 * Zero values don't get 0x.
+		 */
+		if(f->r == 'x' || f->r == 'X')
+			fl &= ~FmtSharp;
 	}
 	for(w = f->prec; n < w && p > buf+3; n++){
 		if((fl & FmtApost) && __needsep(&ndig, &grouping)){

src/lib9/fmt/fmtdef.h

@@ -41,6 +41,7 @@ void         __fmtunlock(void);
 int          __ifmt(Fmt *f);
 int          __isInf(double d, int sign);
 int          __isNaN(double d);
+int          __needsep(int*, char**);
 int          __needsquotes(char *s, int *quotelenp);
 int          __percentfmt(Fmt *f);
 void         __quotesetup(char *s, Rune *r, int nin, int nout, Quoteinfo *q, int sharp, int runesout);

src/lib9/fmt/fmtlocale.c

@@ -1,12 +1,11 @@
-/* Copyright (c) 2002-2006 Lucent Technologies; see LICENSE */
+/* Copyright (c) 2004 Google Inc.; see LICENSE */
+
 #include <stdarg.h>
 #include <string.h>
 #include "plan9.h"
 #include "fmt.h"
 #include "fmtdef.h"
 
-/* XXX GOOGLE COPYRIGHT */
-
 /*
  * Fill in the internationalization stuff in the State structure.
  * For nil arguments, provide the sensible defaults:
@@ -35,7 +34,7 @@ fmtlocaleinit(Fmt *f, char *decimal, char *thousands, char *grouping)
  * and pointer into the grouping descriptor.
  */
 int
-__needsep(int *ndig, const char **grouping)
+__needsep(int *ndig, char **grouping)
 {
 	int group;
 	

src/lib9/fmt/fmtnull.c

@@ -0,0 +1,33 @@
+/* Copyright (c) 2004 Google Inc.; see LICENSE */
+#include <stdarg.h>
+#include <string.h>
+#include "plan9.h"
+#include "fmt.h"
+#include "fmtdef.h"
+
+/*
+ * Absorb output without using resources.
+ */
+static Rune nullbuf[32];
+
+static int
+__fmtnullflush(Fmt *f)
+{
+	f->to = nullbuf;
+	f->nfmt = 0;
+	return 0;
+}
+
+int
+fmtnullinit(Fmt *f)
+{
+	memset(&f, 0, sizeof *f);
+	f->runes = 1;
+	f->start = nullbuf;
+	f->to = nullbuf;
+	f->stop = nullbuf+nelem(nullbuf);
+	f->flush = __fmtnullflush;
+	fmtlocaleinit(f, nil, nil, nil);
+	return 0;
+}
+

src/lib9/fmt/test.c

@@ -1,4 +1,6 @@
 /* Copyright (c) 2002-2006 Lucent Technologies; see LICENSE */
+/* Copyright (c) 2004 Google Inc.; see LICENSE */
+
 #include <stdio.h>
 #include <stdarg.h>
 #include <utf.h>