From dad40407705801c8bb597d5bc9a4eda562cae890 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Tue, 17 Apr 2012 22:05:51 -0400
Subject: [PATCH] fix failure to read infinity in scanf

this code worked in strtod, but not in scanf. more evidence that i
should design a better interface for discarding multiple tail
characters than just calling unget repeatedly...
---
 src/internal/floatscan.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index 377a008b..da209e27 100644
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -428,9 +428,10 @@ long double __floatscan(FILE *f, int c, int prec, int pok)
 	for (i=0; i<8 && (c|32)=="infinity"[i]; i++)
 		if (i<7) c = shgetc(f);
 	if (i==3 || i==8 || (i>3 && pok)) {
-		if (i==3) shunget(f);
-		if (pok) for (; i>3; i--) shunget(f);
-		else shlim(f, 0);
+		if (i!=8) {
+			shunget(f);
+			if (pok) for (; i>3; i--) shunget(f);
+		}
 		return sign * INFINITY;
 	}
 	if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
-- 
GitLab