X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Finternal%2Ffloatscan.c;h=082512130264c7375daafb58589cd3def53754bf;hp=dbe07987139e2417ca378a7b0d504749f84e80da;hb=8489897e01b8a27c365c9c98b200ee25dc124cb4;hpb=2df2a97a20df22f598810b88409eb6107d23e7e1

diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index dbe07987..08251213 100644
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -24,6 +24,8 @@
 
 #define MASK (KMAX-1)
 
+#define CONCAT2(x,y) x ## y
+#define CONCAT(x,y) CONCAT2(x,y)
 
 static long long scanexp(FILE *f, int pok)
 {
@@ -63,6 +65,8 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	int gotdig = 0, gotrad = 0;
 	int rp;
 	int e2;
+	int emax = -emin-bits+3;
+	int denormal = 0;
 	long double y;
 	long double frac=0;
 	long double bias=0;
@@ -85,7 +89,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 			if (gotrad) break;
 			gotrad = 1;
 			lrp = dc;
-		} else if (k < KMAX-2) {
+		} else if (k < KMAX-3) {
 			dc++;
 			if (c!='0') lnz = dc;
 			if (j) x[k] = x[k]*10 + c-'0';
@@ -97,7 +101,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 			gotdig=1;
 		} else {
 			dc++;
-			if (c!='0') x[KMAX-3] |= 1;
+			if (c!='0') x[KMAX-4] |= 1;
 		}
 	}
 	if (!gotrad) lrp=dc;
@@ -139,7 +143,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	}
 
 	/* Align incomplete final B1B digit */
-	if (k<KMAX && j) {
+	if (j) {
 		for (; j<9; j++) x[k]*=10;
 		k++;
 		j=0;
@@ -195,11 +199,11 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 		}
 		if (carry) {
 			rp += 9;
+			a = (a-1 & MASK);
 			if (a == z) {
 				z = (z-1 & MASK);
 				x[z-1 & MASK] |= x[z];
 			}
-			a = (a-1 & MASK);
 			x[a] = carry;
 		}
 	}
@@ -240,7 +244,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 
 	/* Assemble desired bits into floating point variable */
 	for (y=i=0; i<LD_B1B_DIG; i++) {
-		if ((a+i & MASK)==z) x[z=(z+1 & MASK)] = 0;
+		if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
 		y = 1000000000.0L * y + x[a+i & MASK];
 	}
 
@@ -250,6 +254,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	if (bits > LDBL_MANT_DIG+e2-emin) {
 		bits = LDBL_MANT_DIG+e2-emin;
 		if (bits<0) bits=0;
+		denormal = 1;
 	}
 
 	/* Calculate bias term to force rounding, move out lower bits */
@@ -280,11 +285,18 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	y += frac;
 	y -= bias;
 
-	y = scalbnl(y, e2);
-
-	if (!y) errno = ERANGE;
+	if ((e2+LDBL_MANT_DIG & INT_MAX) > emax-5) {
+		if (fabs(y) >= CONCAT(0x1p, LDBL_MANT_DIG)) {
+			if (denormal && bits==LDBL_MANT_DIG+e2-emin)
+				denormal = 0;
+			y *= 0.5;
+			e2++;
+		}
+		if (e2+LDBL_MANT_DIG>emax || (denormal && frac))
+			errno = ERANGE;
+	}
 
-	return y;
+	return scalbnl(y, e2);
 }
 
 static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
@@ -340,7 +352,7 @@ static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
 		} else {
 			shlim(f, 0);
 		}
-		return 0;
+		return sign * 0.0;
 	}
 	if (!gotrad) rp = dc;
 	while (dc<8) x *= 16, dc++;
@@ -402,7 +414,7 @@ static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
 long double __floatscan(FILE *f, int prec, int pok)
 {
 	int sign = 1;
-	int i;
+	size_t i;
 	int bits;
 	int emin;
 	int c;
@@ -443,6 +455,24 @@ long double __floatscan(FILE *f, int prec, int pok)
 	if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
 		if (i<2) c = shgetc(f);
 	if (i==3) {
+		if (shgetc(f) != '(') {
+			shunget(f);
+			return NAN;
+		}
+		for (i=1; ; i++) {
+			c = shgetc(f);
+			if (c-'0'<10U || c-'A'<26U || c-'a'<26U || c=='_')
+				continue;
+			if (c==')') return NAN;
+			shunget(f);
+			if (!pok) {
+				errno = EINVAL;
+				shlim(f, 0);
+				return 0;
+			}
+			while (i--) shunget(f);
+			return NAN;
+		}
 		return NAN;
 	}