From ce9da214b7d9186c1e3ca61177ce86f3ac7f33a0 Mon Sep 17 00:00:00 2001
From: Rob Pike <r@golang.org>
Date: Mon, 31 May 2010 14:57:32 -0700
Subject: [PATCH] fmt: fix end-of-array error in parsenum. Fixes #821.

R=rsc
CC=golang-dev
https://golang.org/cl/1434041
---
 src/pkg/fmt/fmt_test.go |  1 +
 src/pkg/fmt/print.go    | 12 ++++--------
 2 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/pkg/fmt/fmt_test.go b/src/pkg/fmt/fmt_test.go
index dd5f2d5450..957ac041fe 100644
--- a/src/pkg/fmt/fmt_test.go
+++ b/src/pkg/fmt/fmt_test.go
@@ -265,6 +265,7 @@ var fmttests = []fmtTest{
 	fmtTest{"no args", "hello", "no args?(extra string=hello)"},
 	fmtTest{"%s", nil, "%s(<nil>)"},
 	fmtTest{"%T", nil, "<nil>"},
+	fmtTest{"%-1", 100, "%1(int=100)"},
 }
 
 func TestSprintf(t *testing.T) {
diff --git a/src/pkg/fmt/print.go b/src/pkg/fmt/print.go
index 77af45a941..9ebd09d034 100644
--- a/src/pkg/fmt/print.go
+++ b/src/pkg/fmt/print.go
@@ -511,19 +511,15 @@ func getComplex128(a interface{}) (val complex128, ok bool) {
 }
 
 // Convert ASCII to integer.  n is 0 (and got is false) if no number present.
-
-func parsenum(s string, start, end int) (n int, got bool, newi int) {
+func parsenum(s string, start, end int) (num int, isnum bool, newi int) {
 	if start >= end {
 		return 0, false, end
 	}
-	isnum := false
-	num := 0
-	for '0' <= s[start] && s[start] <= '9' {
-		num = num*10 + int(s[start]-'0')
-		start++
+	for newi = start; newi < end && '0' <= s[newi] && s[newi] <= '9'; newi++ {
+		num = num*10 + int(s[newi]-'0')
 		isnum = true
 	}
-	return num, isnum, start
+	return
 }
 
 type uintptrGetter interface {
-- 
2.50.0